BAEL-3091: The Prototype Pattern in Java (changed code based on valid comments from a reader)

spring-boot-properties/src/main/java/com/baeldung/configurationproperties/ConfigProperties.java

@@ -0,0 +1,124 @@
+package com.baeldung.configurationproperties;
+
+import java.util.List;
+import java.util.Map;
+
+import javax.validation.constraints.Max;
+import javax.validation.constraints.Min;
+import javax.validation.constraints.NotBlank;
+import javax.validation.constraints.Pattern;
+
+import org.hibernate.validator.constraints.Length;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.validation.annotation.Validated;
+
+@Configuration
+@PropertySource("classpath:configprops.properties")
+@ConfigurationProperties(prefix = "mail")
+@Validated
+public class ConfigProperties {
+
+    @Validated
+    public static class Credentials {
+
+        @Length(max = 4, min = 1)
+        private String authMethod;
+        private String username;
+        private String password;
+
+        public String getAuthMethod() {
+            return authMethod;
+        }
+
+        public void setAuthMethod(String authMethod) {
+            this.authMethod = authMethod;
+        }
+
+        public String getUsername() {
+            return username;
+        }
+
+        public void setUsername(String username) {
+            this.username = username;
+        }
+
+        public String getPassword() {
+            return password;
+        }
+
+        public void setPassword(String password) {
+            this.password = password;
+        }
+    }
+
+    @NotBlank
+    private String hostName;
+
+    @Min(1025)
+    @Max(65536)
+    private int port;
+
+    @Pattern(regexp = "^[a-z0-9._%+-]+@[a-z0-9.-]+\\.[a-z]{2,6}$")
+    private String from;
+
+    private Credentials credentials;
+    private List<String> defaultRecipients;
+    private Map<String, String> additionalHeaders;
+
+    public String getHostName() {
+        return hostName;
+    }
+
+    public void setHostName(String hostName) {
+        this.hostName = hostName;
+    }
+
+    public int getPort() {
+        return port;
+    }
+
+    public void setPort(int port) {
+        this.port = port;
+    }
+
+    public String getFrom() {
+        return from;
+    }
+
+    public void setFrom(String from) {
+        this.from = from;
+    }
+
+    public Credentials getCredentials() {
+        return credentials;
+    }
+
+    public void setCredentials(Credentials credentials) {
+        this.credentials = credentials;
+    }
+
+    public List<String> getDefaultRecipients() {
+        return defaultRecipients;
+    }
+
+    public void setDefaultRecipients(List<String> defaultRecipients) {
+        this.defaultRecipients = defaultRecipients;
+    }
+
+    public Map<String, String> getAdditionalHeaders() {
+        return additionalHeaders;
+    }
+
+    public void setAdditionalHeaders(Map<String, String> additionalHeaders) {
+        this.additionalHeaders = additionalHeaders;
+    }
+    
+    @Bean
+    @ConfigurationProperties(prefix = "item")
+    public Item item(){
+        return new Item();
+    }
+}

spring-boot-properties/src/main/java/com/baeldung/configurationproperties/Employee.java

@@ -0,0 +1,30 @@
+package com.baeldung.configurationproperties;
+
+public class Employee {
+
+    private String name;
+    private double salary;
+
+    public Employee(String name, double salary) {
+        super();
+        this.name = name;
+        this.salary = salary;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public double getSalary() {
+        return salary;
+    }
+
+    public void setSalary(double salary) {
+        this.salary = salary;
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/configurationproperties/EmployeeConverter.java

@@ -0,0 +1,16 @@
+package com.baeldung.configurationproperties;
+
+import org.springframework.boot.context.properties.ConfigurationPropertiesBinding;
+import org.springframework.core.convert.converter.Converter;
+import org.springframework.stereotype.Component;
+
+@Component
+@ConfigurationPropertiesBinding
+public class EmployeeConverter implements Converter<String, Employee> {
+
+    @Override
+    public Employee convert(String from) {
+        String[] data = from.split(",");
+        return new Employee(data[0], Double.parseDouble(data[1]));
+    }
+}

spring-boot-properties/src/main/java/com/baeldung/configurationproperties/Item.java

@@ -0,0 +1,31 @@
+package com.baeldung.configurationproperties;
+
+public class Item {
+
+    private String name;
+    private int size;
+
+    public Item() {
+    }
+
+    public Item(String name, int size) {
+        this.name = name;
+        this.size = size;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getSize() {
+        return size;
+    }
+
+    public void setSize(int size) {
+        this.size = size;
+    }
+}

spring-boot-properties/src/main/java/com/baeldung/configurationproperties/PropertiesConversionApplication.java

@@ -0,0 +1,14 @@
+package com.baeldung.configurationproperties;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.ComponentScan;
+
+@SpringBootApplication
+@ComponentScan(basePackageClasses = { PropertyConversion.class, EmployeeConverter.class })
+public class PropertiesConversionApplication {
+    public static void main(String[] args) {
+        SpringApplication.run(PropertiesConversionApplication.class, args);
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/configurationproperties/PropertyConversion.java

@@ -0,0 +1,92 @@
+package com.baeldung.configurationproperties;
+
+import java.time.Duration;
+import java.time.temporal.ChronoUnit;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.convert.DataSizeUnit;
+import org.springframework.boot.convert.DurationUnit;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.util.unit.DataSize;
+import org.springframework.util.unit.DataUnit;
+
+@Configuration
+@PropertySource("classpath:conversion.properties")
+@ConfigurationProperties(prefix = "conversion")
+public class PropertyConversion {
+    private Duration timeInDefaultUnit;
+
+    private Duration timeInNano;
+
+    @DurationUnit(ChronoUnit.DAYS)
+    private Duration timeInDays;
+
+    private DataSize sizeInDefaultUnit;
+
+    private DataSize sizeInGB;
+
+    @DataSizeUnit(DataUnit.TERABYTES)
+    private DataSize sizeInTB;
+
+    private Employee employee;
+
+    // Getters and setters
+
+    public Duration getTimeInDefaultUnit() {
+        return timeInDefaultUnit;
+    }
+
+    public void setTimeInDefaultUnit(Duration timeInDefaultUnit) {
+        this.timeInDefaultUnit = timeInDefaultUnit;
+    }
+
+    public Duration getTimeInNano() {
+        return timeInNano;
+    }
+
+    public void setTimeInNano(Duration timeInNano) {
+        this.timeInNano = timeInNano;
+    }
+
+    public Duration getTimeInDays() {
+        return timeInDays;
+    }
+
+    public void setTimeInDays(Duration timeInDays) {
+        this.timeInDays = timeInDays;
+    }
+
+    public DataSize getSizeInDefaultUnit() {
+        return sizeInDefaultUnit;
+    }
+
+    public void setSizeInDefaultUnit(DataSize sizeInDefaultUnit) {
+        this.sizeInDefaultUnit = sizeInDefaultUnit;
+    }
+
+    public DataSize getSizeInGB() {
+        return sizeInGB;
+    }
+
+    public void setSizeInGB(DataSize sizeInGB) {
+        this.sizeInGB = sizeInGB;
+    }
+
+    public DataSize getSizeInTB() {
+        return sizeInTB;
+    }
+
+    public void setSizeInTB(DataSize sizeInTB) {
+        this.sizeInTB = sizeInTB;
+    }
+
+    public Employee getEmployee() {
+        return employee;
+    }
+
+    public void setEmployee(Employee employee) {
+        this.employee = employee;
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/AdditionalConfiguration.java

@@ -0,0 +1,14 @@
+package com.baeldung.properties;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@EnableConfigurationProperties(AdditionalProperties.class)
+public class AdditionalConfiguration {
+
+    @Autowired
+    private AdditionalProperties additionalProperties;
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/AdditionalProperties.java

@@ -0,0 +1,28 @@
+package com.baeldung.properties;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@ConfigurationProperties(prefix = "additional")
+public class AdditionalProperties {
+
+    private String unit;
+    private int max;
+
+    public String getUnit() {
+        return unit;
+    }
+
+    public void setUnit(String unit) {
+        this.unit = unit;
+    }
+
+    public int getMax() {
+        return max;
+    }
+
+    public void setMax(int max) {
+        this.max = max;
+    }
+}

spring-boot-properties/src/main/java/com/baeldung/properties/ConfigPropertiesDemoApplication.java

@@ -0,0 +1,17 @@
+package com.baeldung.properties;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.context.annotation.ComponentScan;
+
+import com.baeldung.configurationproperties.ConfigProperties;
+
+@SpringBootApplication
+@ComponentScan(basePackageClasses = { ConfigProperties.class, JsonProperties.class, CustomJsonProperties.class })
+public class ConfigPropertiesDemoApplication {
+    public static void main(String[] args) {
+        new SpringApplicationBuilder(ConfigPropertiesDemoApplication.class).initializers(new JsonPropertyContextInitializer())
+            .run();
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/CustomJsonProperties.java

@@ -0,0 +1,71 @@
+package com.baeldung.properties;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.stereotype.Component;
+
+@Component
+@ConfigurationProperties(prefix = "custom")
+public class CustomJsonProperties {
+
+    private String host;
+
+    private int port;
+
+    private boolean resend;
+
+    private Person sender;
+
+    public static class Person {
+
+        private String name;
+        private String address;
+
+        public String getName() {
+            return name;
+        }
+
+        public void setName(String name) {
+            this.name = name;
+        }
+
+        public String getAddress() {
+            return address;
+        }
+
+        public void setAddress(String address) {
+            this.address = address;
+        }
+    }
+
+    public String getHost() {
+        return host;
+    }
+
+    public void setHost(String host) {
+        this.host = host;
+    }
+
+    public int getPort() {
+        return port;
+    }
+
+    public void setPort(int port) {
+        this.port = port;
+    }
+
+    public boolean isResend() {
+        return resend;
+    }
+
+    public void setResend(boolean resend) {
+        this.resend = resend;
+    }
+
+    public Person getSender() {
+        return sender;
+    }
+
+    public void setSender(Person sender) {
+        this.sender = sender;
+    }
+}

spring-boot-properties/src/main/java/com/baeldung/properties/JsonProperties.java

@@ -0,0 +1,64 @@
+package com.baeldung.properties;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.stereotype.Component;
+
+@Component
+@PropertySource(value = "classpath:configprops.json", factory = JsonPropertySourceFactory.class)
+@ConfigurationProperties
+public class JsonProperties {
+
+    private String host;
+
+    private int port;
+
+    private boolean resend;
+
+    private List<String> topics;
+
+    private LinkedHashMap<String, ?> sender;
+
+    public LinkedHashMap<String, ?> getSender() {
+        return sender;
+    }
+
+    public void setSender(LinkedHashMap<String, ?> sender) {
+        this.sender = sender;
+    }
+
+    public List<String> getTopics() {
+        return topics;
+    }
+
+    public void setTopics(List<String> topics) {
+        this.topics = topics;
+    }
+
+    public int getPort() {
+        return port;
+    }
+
+    public void setPort(int port) {
+        this.port = port;
+    }
+
+    public boolean isResend() {
+        return resend;
+    }
+
+    public void setResend(boolean resend) {
+        this.resend = resend;
+    }
+
+    public String getHost() {
+        return host;
+    }
+
+    public void setHost(String host) {
+        this.host = host;
+    }
+}

spring-boot-properties/src/main/java/com/baeldung/properties/JsonPropertyContextInitializer.java

@@ -0,0 +1,68 @@
+package com.baeldung.properties;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+import org.springframework.context.ApplicationContextInitializer;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.core.env.MapPropertySource;
+import org.springframework.core.env.PropertySource;
+import org.springframework.core.io.Resource;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+public class JsonPropertyContextInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {
+
+    private final static String CUSTOM_PREFIX = "custom.";
+
+    @Override
+    @SuppressWarnings("unchecked")
+    public void initialize(ConfigurableApplicationContext configurableApplicationContext) {
+        try {
+            Resource resource = configurableApplicationContext.getResource("classpath:configprops.json");
+            Map readValue = new ObjectMapper().readValue(resource.getInputStream(), Map.class);
+            Set<Map.Entry> set = readValue.entrySet();
+            List<MapPropertySource> propertySources = convertEntrySet(set, Optional.empty());
+            for (PropertySource propertySource : propertySources) {
+                configurableApplicationContext.getEnvironment()
+                    .getPropertySources()
+                    .addFirst(propertySource);
+            }
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static List<MapPropertySource> convertEntrySet(Set<Map.Entry> entrySet, Optional<String> parentKey) {
+        return entrySet.stream()
+            .map((Map.Entry e) -> convertToPropertySourceList(e, parentKey))
+            .flatMap(Collection::stream)
+            .collect(Collectors.toList());
+    }
+
+    private static List<MapPropertySource> convertToPropertySourceList(Map.Entry e, Optional<String> parentKey) {
+        String key = parentKey.map(s -> s + ".")
+            .orElse("") + (String) e.getKey();
+        Object value = e.getValue();
+        return covertToPropertySourceList(key, value);
+    }
+
+    @SuppressWarnings("unchecked")
+    private static List<MapPropertySource> covertToPropertySourceList(String key, Object value) {
+        if (value instanceof LinkedHashMap) {
+            LinkedHashMap map = (LinkedHashMap) value;
+            Set<Map.Entry> entrySet = map.entrySet();
+            return convertEntrySet(entrySet, Optional.ofNullable(key));
+        }
+        String finalKey = CUSTOM_PREFIX + key;
+        return Collections.singletonList(new MapPropertySource(finalKey, Collections.singletonMap(finalKey, value)));
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/JsonPropertySourceFactory.java

@@ -0,0 +1,21 @@
+package com.baeldung.properties;
+
+import java.io.IOException;
+import java.util.Map;
+
+import org.springframework.core.env.MapPropertySource;
+import org.springframework.core.env.PropertySource;
+import org.springframework.core.io.support.EncodedResource;
+import org.springframework.core.io.support.PropertySourceFactory;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+public class JsonPropertySourceFactory implements PropertySourceFactory {
+
+    @Override
+    public PropertySource<?> createPropertySource(String name, EncodedResource resource) throws IOException {
+        Map readValue = new ObjectMapper().readValue(resource.getInputStream(), Map.class);
+        return new MapPropertySource("json-property", readValue);
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/core/ComponentInXmlUsingProperties.java

@@ -0,0 +1,30 @@
+package com.baeldung.properties.core;
+
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.core.env.Environment;
+
+public class ComponentInXmlUsingProperties implements InitializingBean {
+
+    @Autowired
+    private Environment env;
+
+    @Value("${key.something}")
+    private String injectedProperty;
+
+    public ComponentInXmlUsingProperties(final String propertyValue) {
+        super();
+
+        System.out.println("Constructor Injection - Property Value resolved to: " + propertyValue);
+    }
+
+    //
+
+    @Override
+    public void afterPropertiesSet() throws Exception {
+        System.out.println("in afterPropertiesSet via @Value: " + injectedProperty);
+        System.out.println("in afterPropertiesSet Environment: " + env.getProperty("key.something"));
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/core/ComponentUsingProperties.java

@@ -0,0 +1,30 @@
+package com.baeldung.properties.core;
+
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.core.env.Environment;
+import org.springframework.stereotype.Component;
+
+@Component
+public class ComponentUsingProperties implements InitializingBean {
+
+    @Autowired
+    private Environment env;
+
+    @Value("${key.something}")
+    private String injectedProperty;
+
+    public ComponentUsingProperties() {
+        super();
+    }
+
+    //
+
+    @Override
+    public void afterPropertiesSet() throws Exception {
+        System.out.println("in afterPropertiesSet via @Value: " + injectedProperty);
+        System.out.println("in afterPropertiesSet Environment: " + env.getProperty("key.something"));
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/external/ExternalPropertiesWithJavaConfig.java

@@ -0,0 +1,25 @@
+package com.baeldung.properties.external;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
+
+@Configuration
+@ComponentScan("org.baeldung.properties.core")
+@PropertySource("classpath:foo.properties")
+public class ExternalPropertiesWithJavaConfig {
+
+    public ExternalPropertiesWithJavaConfig() {
+        super();
+    }
+
+    // beans
+
+    @Bean
+    public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
+        return new PropertySourcesPlaceholderConfigurer();
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/external/ExternalPropertiesWithXmlConfig.java

@@ -0,0 +1,16 @@
+package com.baeldung.properties.external;
+
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.ImportResource;
+
+@Configuration
+@ImportResource("classpath:configForProperties.xml")
+@ComponentScan("org.baeldung.core")
+public class ExternalPropertiesWithXmlConfig {
+
+    public ExternalPropertiesWithXmlConfig() {
+        super();
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/external/ExternalPropertiesWithXmlConfigOne.java

@@ -0,0 +1,16 @@
+package com.baeldung.properties.external;
+
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.ImportResource;
+
+@Configuration
+@ImportResource("classpath:configForPropertiesOne.xml")
+@ComponentScan("org.baeldung.core")
+public class ExternalPropertiesWithXmlConfigOne {
+
+    public ExternalPropertiesWithXmlConfigOne() {
+        super();
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/external/ExternalPropertiesWithXmlConfigTwo.java

@@ -0,0 +1,14 @@
+package com.baeldung.properties.external;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.ImportResource;
+
+@Configuration
+@ImportResource("classpath:basicConfigForPropertiesTwo.xml")
+public class ExternalPropertiesWithXmlConfigTwo {
+
+    public ExternalPropertiesWithXmlConfigTwo() {
+        super();
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/reloading/SpringBootPropertiesApplication.java

@@ -0,0 +1,44 @@
+package com.baeldung.properties.reloading;
+
+import com.baeldung.properties.reloading.configs.ReloadableProperties;
+import java.io.File;
+import java.util.Properties;
+import org.apache.commons.configuration.PropertiesConfiguration;
+import org.apache.commons.configuration.reloading.FileChangedReloadingStrategy;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Primary;
+
+@SpringBootApplication
+public class SpringBootPropertiesApplication {
+
+    @Bean
+    @ConditionalOnProperty(name = "spring.config.location", matchIfMissing = false)
+    public PropertiesConfiguration propertiesConfiguration(
+      @Value("${spring.config.location}") String path,
+      @Value("${spring.properties.refreshDelay}") long refreshDelay) throws Exception {
+        String filePath = path.substring("file:".length());
+        PropertiesConfiguration configuration = new PropertiesConfiguration(new File(filePath).getCanonicalPath());
+        FileChangedReloadingStrategy fileChangedReloadingStrategy = new FileChangedReloadingStrategy();
+        fileChangedReloadingStrategy.setRefreshDelay(refreshDelay);
+        configuration.setReloadingStrategy(fileChangedReloadingStrategy);
+        return configuration;
+    }
+
+    @Bean
+    @ConditionalOnBean(PropertiesConfiguration.class)
+    @Primary
+    public Properties properties(PropertiesConfiguration propertiesConfiguration) throws Exception {
+        ReloadableProperties properties = new ReloadableProperties(propertiesConfiguration);
+        return properties;
+    }
+
+    public static void main(String[] args) {
+        SpringApplication.run(SpringBootPropertiesApplication.class, args);
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/reloading/configs/PropertiesException.java

@@ -0,0 +1,10 @@
+package com.baeldung.properties.reloading.configs;
+
+public class PropertiesException extends RuntimeException {
+    public PropertiesException() {
+    }
+
+    public PropertiesException(Throwable cause) {
+        super(cause);
+    }
+}

spring-boot-properties/src/main/java/com/baeldung/properties/reloading/configs/ReloadableProperties.java

@@ -0,0 +1,49 @@
+package com.baeldung.properties.reloading.configs;
+
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.Reader;
+import java.util.Properties;
+import javax.naming.OperationNotSupportedException;
+import org.apache.commons.configuration.PropertiesConfiguration;
+
+public class ReloadableProperties extends Properties {
+    private PropertiesConfiguration propertiesConfiguration;
+
+    public ReloadableProperties(PropertiesConfiguration propertiesConfiguration) throws IOException {
+        super.load(new FileReader(propertiesConfiguration.getFile()));
+        this.propertiesConfiguration = propertiesConfiguration;
+    }
+
+    @Override
+    public synchronized Object setProperty(String key, String value) {
+        propertiesConfiguration.setProperty(key, value);
+        return super.setProperty(key, value);
+    }
+
+    @Override
+    public String getProperty(String key) {
+        String val = propertiesConfiguration.getString(key);
+        super.setProperty(key, val);
+        return val;
+    }
+
+    @Override
+    public String getProperty(String key, String defaultValue) {
+        String val = propertiesConfiguration.getString(key, defaultValue);
+        super.setProperty(key, val);
+        return val;
+    }
+
+    @Override
+    public synchronized void load(Reader reader) throws IOException {
+        throw new PropertiesException(new OperationNotSupportedException());
+    }
+
+    @Override
+    public synchronized void load(InputStream inStream) throws IOException {
+        throw new PropertiesException(new OperationNotSupportedException());
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/reloading/configs/ReloadablePropertySource.java

@@ -0,0 +1,33 @@
+package com.baeldung.properties.reloading.configs;
+
+import org.apache.commons.configuration.PropertiesConfiguration;
+import org.apache.commons.configuration.reloading.FileChangedReloadingStrategy;
+import org.springframework.core.env.PropertySource;
+import org.springframework.util.StringUtils;
+
+public class ReloadablePropertySource extends PropertySource {
+
+    PropertiesConfiguration propertiesConfiguration;
+
+    public ReloadablePropertySource(String name, PropertiesConfiguration propertiesConfiguration) {
+        super(name);
+        this.propertiesConfiguration = propertiesConfiguration;
+    }
+
+    public ReloadablePropertySource(String name, String path) {
+        super(StringUtils.isEmpty(name) ? path : name);
+        try {
+            this.propertiesConfiguration = new PropertiesConfiguration(path);
+            FileChangedReloadingStrategy strategy = new FileChangedReloadingStrategy();
+            strategy.setRefreshDelay(1000);
+            this.propertiesConfiguration.setReloadingStrategy(strategy);
+        } catch (Exception e) {
+            throw new PropertiesException(e);
+        }
+    }
+
+    @Override
+    public Object getProperty(String s) {
+        return propertiesConfiguration.getProperty(s);
+    }
+}

spring-boot-properties/src/main/java/com/baeldung/properties/reloading/configs/ReloadablePropertySourceConfig.java

@@ -0,0 +1,29 @@
+package com.baeldung.properties.reloading.configs;
+
+import org.apache.commons.configuration.PropertiesConfiguration;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.env.ConfigurableEnvironment;
+import org.springframework.core.env.MutablePropertySources;
+
+@Configuration
+public class ReloadablePropertySourceConfig {
+
+    private ConfigurableEnvironment env;
+
+    public ReloadablePropertySourceConfig(@Autowired ConfigurableEnvironment env) {
+        this.env = env;
+    }
+
+    @Bean
+    @ConditionalOnProperty(name = "spring.config.location", matchIfMissing = false)
+    public ReloadablePropertySource reloadablePropertySource(PropertiesConfiguration properties) {
+        ReloadablePropertySource ret = new ReloadablePropertySource("dynamic", properties);
+        MutablePropertySources sources = env.getPropertySources();
+        sources.addFirst(ret);
+        return ret;
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/reloading/configs/ReloadablePropertySourceFactory.java

@@ -0,0 +1,25 @@
+package com.baeldung.properties.reloading.configs;
+
+import java.io.IOException;
+import org.springframework.core.env.PropertySource;
+import org.springframework.core.io.FileSystemResource;
+import org.springframework.core.io.FileUrlResource;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.support.DefaultPropertySourceFactory;
+import org.springframework.core.io.support.EncodedResource;
+
+public class ReloadablePropertySourceFactory extends DefaultPropertySourceFactory {
+    @Override
+    public PropertySource<?> createPropertySource(String s, EncodedResource encodedResource) throws IOException {
+        Resource internal = encodedResource.getResource();
+        if (internal instanceof FileSystemResource) {
+            return new ReloadablePropertySource(s, ((FileSystemResource) internal).getPath());
+        }
+        if (internal instanceof FileUrlResource) {
+            return new ReloadablePropertySource(s, ((FileUrlResource) internal)
+              .getURL()
+              .getPath());
+        }
+        return super.createPropertySource(s, encodedResource);
+    }
+}

spring-boot-properties/src/main/java/com/baeldung/properties/spring/BasicPropertiesWithJavaConfig.java

@@ -0,0 +1,14 @@
+package com.baeldung.properties.spring;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+
+@Configuration
+@PropertySource("classpath:foo.properties")
+public class BasicPropertiesWithJavaConfig {
+
+    public BasicPropertiesWithJavaConfig() {
+        super();
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/spring/PropertiesWithJavaConfig.java

@@ -0,0 +1,24 @@
+package com.baeldung.properties.spring;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;
+
+@Configuration
+@PropertySource("classpath:foo.properties")
+@PropertySource("classpath:bar.properties")
+public class PropertiesWithJavaConfig {
+
+    public PropertiesWithJavaConfig() {
+        super();
+    }
+
+    // beans
+
+    @Bean
+    public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
+        return new PropertySourcesPlaceholderConfigurer();
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/spring/PropertiesWithJavaConfigOther.java

@@ -0,0 +1,16 @@
+package com.baeldung.properties.spring;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+
+@Configuration
+@PropertySource("classpath:bar.properties")
+public class PropertiesWithJavaConfigOther {
+
+    public PropertiesWithJavaConfigOther() {
+        super();
+    }
+
+    // beans
+
+}

spring-boot-properties/src/main/java/com/baeldung/properties/spring/PropertiesWithPlaceHolderConfigurer.java

@@ -0,0 +1,21 @@
+package com.baeldung.properties.spring;
+
+import org.springframework.beans.factory.config.PropertyPlaceholderConfigurer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class PropertiesWithPlaceHolderConfigurer {
+
+    public PropertiesWithPlaceHolderConfigurer() {
+        super();
+    }
+
+    @Bean
+    public PropertyPlaceholderConfigurer propertyConfigurer() {
+        final PropertyPlaceholderConfigurer props = new PropertyPlaceholderConfigurer();
+        props.setSystemPropertiesMode(PropertyPlaceholderConfigurer.SYSTEM_PROPERTIES_MODE_FALLBACK);
+        return props;
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/value/ClassNotManagedBySpring.java

@@ -0,0 +1,28 @@
+package com.baeldung.value;
+
+public class ClassNotManagedBySpring {
+
+    private String customVariable;
+    private String anotherCustomVariable;
+
+    public ClassNotManagedBySpring(String someInitialValue, String anotherManagedValue) {
+        this.customVariable = someInitialValue;
+        this.anotherCustomVariable = anotherManagedValue;
+    }
+
+    public String getCustomVariable() {
+        return customVariable;
+    }
+
+    public void setCustomVariable(String customVariable) {
+        this.customVariable = customVariable;
+    }
+
+    public String getAnotherCustomVariable() {
+        return anotherCustomVariable;
+    }
+
+    public void setAnotherCustomVariable(String anotherCustomVariable) {
+        this.anotherCustomVariable = anotherCustomVariable;
+    }
+}

spring-boot-properties/src/main/java/com/baeldung/value/InitializerBean.java

@@ -0,0 +1,21 @@
+package com.baeldung.value;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+@Component
+public class InitializerBean {
+
+    private String someInitialValue;
+    private String anotherManagedValue;
+
+    public InitializerBean(@Value("someInitialValue") String someInitialValue, @Value("anotherValue") String anotherManagedValue) {
+        this.someInitialValue = someInitialValue;
+        this.anotherManagedValue = anotherManagedValue;
+    }
+
+    public ClassNotManagedBySpring initClass() {
+        return new ClassNotManagedBySpring(this.someInitialValue, this.anotherManagedValue);
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/value/SomeBean.java

@@ -0,0 +1,17 @@
+package com.baeldung.value;
+
+public class SomeBean {
+    private int someValue;
+
+    public SomeBean(int someValue) {
+        this.someValue = someValue;
+    }
+
+    public int getSomeValue() {
+        return someValue;
+    }
+
+    public void setSomeValue(int someValue) {
+        this.someValue = someValue;
+    }
+}

spring-boot-properties/src/main/java/com/baeldung/value/ValuesApp.java

@@ -0,0 +1,102 @@
+package com.baeldung.value;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+
+import javax.annotation.PostConstruct;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+
+@Configuration
+@PropertySource(name = "myProperties", value = "values.properties")
+public class ValuesApp {
+
+    @Value("string value")
+    private String stringValue;
+
+    @Value("${value.from.file}")
+    private String valueFromFile;
+
+    @Value("${systemValue}")
+    private String systemValue;
+
+    @Value("${unknown_param:some default}")
+    private String someDefault;
+
+    @Value("${priority}")
+    private String prioritySystemProperty;
+
+    @Value("${listOfValues}")
+    private String[] valuesArray;
+
+    @Value("#{systemProperties['priority']}")
+    private String spelValue;
+
+    @Value("#{systemProperties['unknown'] ?: 'some default'}")
+    private String spelSomeDefault;
+
+    @Value("#{someBean.someValue}")
+    private Integer someBeanValue;
+
+    @Value("#{'${listOfValues}'.split(',')}")
+    private List<String> valuesList;
+	
+    @Value("#{${valuesMap}}")
+    private Map<String, Integer> valuesMap;
+
+    @Value("#{${valuesMap}.key1}")
+    private Integer valuesMapKey1;
+
+    @Value("#{${valuesMap}['unknownKey']}")
+    private Integer unknownMapKey;
+
+    @Value("#{${unknownMap : {key1:'1', key2 : '2'}}}")
+    private Map<String, Integer> unknownMap;
+
+    @Value("#{${valuesMap}['unknownKey'] ?: 5}")
+    private Integer unknownMapKeyWithDefaultValue;
+
+    @Value("#{${valuesMap}.?[value>'1']}")
+    private Map<String, Integer> valuesMapFiltered;
+
+    @Value("#{systemProperties}")
+    private Map<String, String> systemPropertiesMap;
+
+    public static void main(String[] args) {
+        System.setProperty("systemValue", "Some system parameter value");
+        System.setProperty("priority", "System property");
+        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(ValuesApp.class);
+    }
+
+    @Bean
+    public SomeBean someBean() {
+        return new SomeBean(10);
+    }
+
+    @PostConstruct
+    public void afterInitialize() {
+        System.out.println(stringValue);
+        System.out.println(valueFromFile);
+        System.out.println(systemValue);
+        System.out.println(someDefault);
+        System.out.println(prioritySystemProperty);
+        System.out.println(Arrays.toString(valuesArray));
+        System.out.println(spelValue);
+        System.out.println(spelSomeDefault);
+        System.out.println(someBeanValue);
+        System.out.println(valuesList);
+        System.out.println(valuesMap);
+        System.out.println(valuesMapKey1);
+        System.out.println(unknownMapKey);
+        System.out.println(unknownMap);
+        System.out.println(unknownMapKeyWithDefaultValue);
+        System.out.println(valuesMapFiltered);
+        System.out.println(systemPropertiesMap);
+    }
+}

spring-boot-properties/src/main/java/com/baeldung/valuewithdefaults/ValuesWithDefaultsApp.java

@@ -0,0 +1,75 @@
+package com.baeldung.valuewithdefaults;
+
+import java.util.Arrays;
+import java.util.List;
+
+import javax.annotation.PostConstruct;
+
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.PropertySource;
+import org.springframework.util.Assert;
+
+import com.google.common.collect.Lists;
+import com.google.common.primitives.Ints;
+
+/**
+ * Demonstrates setting defaults for @Value annotation.  Note that there are no properties 
+ * defined in the specified property source.  We also assume that the user here
+ * does not have a system property named some.key.
+ *
+ */
+@Configuration
+@PropertySource(name = "myProperties", value = "valueswithdefaults.properties")
+public class ValuesWithDefaultsApp {
+
+    @Value("${some.key:my default value}")
+    private String stringWithDefaultValue;
+
+    @Value("${some.key:}")
+    private String stringWithBlankDefaultValue;
+
+    @Value("${some.key:true}")
+    private boolean booleanWithDefaultValue;
+    
+    @Value("${some.key:42}")
+    private int intWithDefaultValue;  
+
+    @Value("${some.key:one,two,three}")
+    private String[] stringArrayWithDefaults;
+
+    @Value("${some.key:1,2,3}")
+    private int[] intArrayWithDefaults;
+
+    @Value("#{systemProperties['some.key'] ?: 'my default system property value'}")
+    private String spelWithDefaultValue;
+    
+
+    public static void main(String[] args) {
+        ApplicationContext applicationContext = new AnnotationConfigApplicationContext(ValuesWithDefaultsApp.class);
+    }
+
+    @PostConstruct
+    public void afterInitialize() {
+    	// strings
+    	Assert.isTrue(stringWithDefaultValue.equals("my default value"));
+    	Assert.isTrue(stringWithBlankDefaultValue.equals(""));
+    	
+    	// other primitives
+    	Assert.isTrue(booleanWithDefaultValue);
+    	Assert.isTrue(intWithDefaultValue == 42);
+    	
+    	// arrays
+    	List<String> stringListValues = Lists.newArrayList("one", "two", "three");
+    	Assert.isTrue(Arrays.asList(stringArrayWithDefaults).containsAll(stringListValues));
+
+    	List<Integer> intListValues = Lists.newArrayList(1, 2, 3);
+    	Assert.isTrue(Ints.asList(intArrayWithDefaults).containsAll(intListValues));
+
+    	// SpEL
+    	Assert.isTrue(spelWithDefaultValue.equals("my default system property value"));
+    	
+    }
+}

spring-boot-properties/src/main/java/com/baeldung/yaml/MyApplication.java

@@ -0,0 +1,31 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package com.baeldung.yaml;
+
+import java.util.Collections;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class MyApplication implements CommandLineRunner {
+
+    @Autowired
+    private YAMLConfig myConfig;
+
+    public static void main(String[] args) {
+        SpringApplication app = new SpringApplication(MyApplication.class);
+        app.run();
+    }
+
+    public void run(String... args) throws Exception {
+        System.out.println("using environment:" + myConfig.getEnvironment());
+        System.out.println("name:" + myConfig.getName());
+        System.out.println("servers:" + myConfig.getServers());
+    }
+
+}

spring-boot-properties/src/main/java/com/baeldung/yaml/YAMLConfig.java

@@ -0,0 +1,41 @@
+package com.baeldung.yaml;
+
+import java.util.ArrayList;
+import java.util.List;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+@EnableConfigurationProperties
+@ConfigurationProperties
+public class YAMLConfig {
+    private String name;
+    private String environment;
+    private List<String> servers = new ArrayList<String>();
+
+    public List<String> getServers() {
+        return servers;
+    }
+
+    public void setServers(List<String> servers) {
+        this.servers = servers;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getEnvironment() {
+        return environment;
+    }
+
+    public void setEnvironment(String environment) {
+        this.environment = environment;
+    }
+
+}

spring-boot-properties/src/main/resources/application.properties

@@ -0,0 +1,4 @@
+management.endpoints.web.exposure.include=refresh
+spring.properties.refreshDelay=1000
+spring.config.location=file:extra.properties
+spring.main.allow-bean-definition-overriding=true

spring-boot-properties/src/main/resources/application.yml

@@ -0,0 +1,17 @@
+spring:
+    profiles: test
+name: test-YAML
+environment: test
+servers:
+    - www.abc.test.com
+    - www.xyz.test.com
+    
+---
+
+spring:
+    profiles: prod
+name: prod-YAML
+environment: production
+servers:
+    - www.abc.com
+    - www.xyz.com

spring-boot-properties/src/main/resources/bar.properties

@@ -0,0 +1 @@
+key.something2=val2

spring-boot-properties/src/main/resources/basicConfigForProperties.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
+    xmlns:util="http://www.springframework.org/schema/util"
+    xsi:schemaLocation="
+      http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
+      http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd
+      http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd"
+>
+
+    <context:property-placeholder location="classpath:foo.properties"/>
+
+</beans>

spring-boot-properties/src/main/resources/basicConfigForPropertiesOne.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
+    xmlns:util="http://www.springframework.org/schema/util"
+    xsi:schemaLocation="
+      http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
+      http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd
+      http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd"
+>
+
+    <context:property-placeholder location="classpath:foo.properties" ignore-unresolvable="true" order="1"/>
+
+</beans>

spring-boot-properties/src/main/resources/basicConfigForPropertiesTwo.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
+	xmlns:util="http://www.springframework.org/schema/util"
+	xsi:schemaLocation="
+      http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
+      http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd
+      http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd">
+
+	<context:property-placeholder location="classpath:bar.properties"
+		order="2" />
+
+</beans>

spring-boot-properties/src/main/resources/child.properties

@@ -0,0 +1 @@
+child.name=child

spring-boot-properties/src/main/resources/configForProperties.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
+    xmlns:util="http://www.springframework.org/schema/util"
+    xsi:schemaLocation="
+      http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
+      http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd
+      http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd"
+>
+
+    <context:property-placeholder location="classpath:foo.properties,classpath:bar.properties"/>
+
+    <bean id="componentInXmlUsingProperties" class="com.baeldung.properties.core.ComponentInXmlUsingProperties">
+        <constructor-arg value="${key.something}"/>
+    </bean>
+
+</beans>

spring-boot-properties/src/main/resources/configForPropertiesOne.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
+    xmlns:util="http://www.springframework.org/schema/util"
+    xsi:schemaLocation="
+      http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
+      http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.2.xsd
+      http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd"
+>
+
+    <context:property-placeholder location="classpath:foo.properties" ignore-unresolvable="true" order="1"/>
+
+    <bean id="componentInXmlUsingProperties" class="com.baeldung.properties.core.ComponentInXmlUsingProperties">
+        <constructor-arg value="${key.something2}"/>
+    </bean>
+
+</beans>

spring-boot-properties/src/main/resources/configprops.json

@@ -0,0 +1,10 @@
+{
+  "host" : "mailer@mail.com",
+  "port" : 9090,
+  "resend" : true,
+  "topics" : ["spring", "boot"],
+  "sender" : {
+    "name": "sender",
+    "address": "street"
+  }
+}

spring-boot-properties/src/main/resources/configprops.properties

@@ -0,0 +1,27 @@
+#Simple properties
+mail.hostname=host@mail.com
+mail.port=9000
+mail.from=mailer@mail.com
+
+#List properties
+mail.defaultRecipients[0]=admin@mail.com
+mail.defaultRecipients[1]=owner@mail.com
+
+#Map Properties
+mail.additionalHeaders.redelivery=true
+mail.additionalHeaders.secure=true
+mail.additionalHeaders.p3=value
+
+#Object properties
+mail.credentials.username=john
+mail.credentials.password=password
+mail.credentials.authMethod=SHA1
+
+#Bean method properties
+item.name=Item name
+item.size=42
+
+
+#Additional properties
+additional.unit=km
+additional.max=100

spring-boot-properties/src/main/resources/conversion.properties

@@ -0,0 +1,2 @@
+conversion.timeInDefaultUnit=10
+conversion.timeInNano=9ns

spring-boot-properties/src/main/resources/foo.properties

@@ -0,0 +1 @@
+key.something=val

spring-boot-properties/src/main/resources/parent.properties

@@ -0,0 +1 @@
+parent.name=parent

spring-boot-properties/src/main/resources/values.properties

@@ -0,0 +1,4 @@
+value.from.file=Value got from the file
+priority=Properties file
+listOfValues=A,B,C
+valuesMap={key1:'1', key2 : '2', key3 : '3'}