Merge remote-tracking branch 'eugenp/master'

core-java-modules/core-java-8/src/main/java/com/baeldung/java_8_features/groupingby/Tuple.java

@@ -0,0 +1,34 @@
+package com.baeldung.java_8_features.groupingby;
+
+public class Tuple {
+
+    private BlogPostType type;
+    private String author;
+    
+    public Tuple(BlogPostType type, String author) {
+        super();
+        this.type = type;
+        this.author = author;
+    }
+
+    public BlogPostType getType() {
+        return type;
+    }
+
+    public void setType(BlogPostType type) {
+        this.type = type;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    @Override
+    public String toString() {
+        return "Tuple [type=" + type + ", author=" + author + ", getType()=" + getType() + ", getAuthor()=" + getAuthor() + ", getClass()=" + getClass() + ", hashCode()=" + hashCode() + ", toString()=" + super.toString() + "]";
+    }
+}

core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/constructors/BankAccount.java

@@ -54,3 +54,15 @@ class BankAccountCopyConstructor extends BankAccount {
         this.balance = 0.0f;
     }
 }
+
+class BankAccountChainedConstructors extends BankAccount {
+    public BankAccountChainedConstructors(String name, LocalDateTime opened, double balance) {
+        this.name = name;
+        this.opened = opened;
+        this.balance = balance;
+    }
+
+    public BankAccountChainedConstructors(String name) {
+        this(name, LocalDateTime.now(), 0.0f);
+    }
+}

core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/constructors/ConstructorUnitTest.java

@@ -1,15 +1,14 @@
 package com.baeldung.constructors;
 
-import com.baeldung.constructors.*;
+import com.google.common.collect.Comparators;
+import org.junit.Test;
 
-import java.util.logging.Logger;
 import java.time.LocalDateTime;
 import java.time.Month;
+import java.util.ArrayList;
+import java.util.logging.Logger;
 
-import org.junit.Test;
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.assertThatCode;
-import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.assertj.core.api.Assertions.*;
 
 public class ConstructorUnitTest {
     final static Logger LOGGER = Logger.getLogger(ConstructorUnitTest.class.getName());
@@ -17,26 +16,28 @@ public class ConstructorUnitTest {
     @Test
     public void givenNoExplicitContructor_whenUsed_thenFails() {
         BankAccount account = new BankAccount();
-        assertThatThrownBy(() -> { account.toString(); }).isInstanceOf(Exception.class);
+        assertThatThrownBy(() -> {
+            account.toString();
+        }).isInstanceOf(Exception.class);
     }
 
     @Test
     public void givenNoArgumentConstructor_whenUsed_thenSucceeds() {
         BankAccountEmptyConstructor account = new BankAccountEmptyConstructor();
         assertThatCode(() -> {
-                account.toString();
-            }).doesNotThrowAnyException();
+            account.toString();
+        }).doesNotThrowAnyException();
     }
 
     @Test
     public void givenParameterisedConstructor_whenUsed_thenSucceeds() {
         LocalDateTime opened = LocalDateTime.of(2018, Month.JUNE, 29, 06, 30, 00);
         BankAccountParameterizedConstructor account =
-            new BankAccountParameterizedConstructor("Tom", opened, 1000.0f);
-        
+                new BankAccountParameterizedConstructor("Tom", opened, 1000.0f);
+
         assertThatCode(() -> {
-                account.toString();
-            }).doesNotThrowAnyException();
+            account.toString();
+        }).doesNotThrowAnyException();
     }
 
     @Test
@@ -47,7 +48,16 @@ public class ConstructorUnitTest {
 
         assertThat(account.getName()).isEqualTo(newAccount.getName());
         assertThat(account.getOpened()).isNotEqualTo(newAccount.getOpened());
-        
+
         assertThat(newAccount.getBalance()).isEqualTo(0.0f);
     }
+
+    @Test
+    public void givenChainedConstructor_whenUsed_thenMaintainsLogic() {
+        BankAccountChainedConstructors account = new BankAccountChainedConstructors("Tim");
+        BankAccountChainedConstructors newAccount = new BankAccountChainedConstructors("Tim", LocalDateTime.now(), 0.0f);
+
+        assertThat(account.getName()).isEqualTo(newAccount.getName());
+        assertThat(account.getBalance()).isEqualTo(newAccount.getBalance());
+    }
 }

core-java-modules/core-java-lang/README.md

@@ -18,7 +18,6 @@
 - [A Guide to Inner Interfaces in Java](http://www.baeldung.com/java-inner-interfaces)
 - [Recursion In Java](http://www.baeldung.com/java-recursion)
 - [A Guide to the finalize Method in Java](http://www.baeldung.com/java-finalize)
-- [A Guide to Java Enums](http://www.baeldung.com/a-guide-to-java-enums)
 - [Infinite Loops in Java](http://www.baeldung.com/infinite-loops-java)
 - [Quick Guide to java.lang.System](http://www.baeldung.com/java-lang-system)
 - [Using Java Assertions](http://www.baeldung.com/java-assert)

core-java-modules/core-java-os/src/main/java/com/baeldung/core/pwd/CurrentDirectoryFetcher.java

@@ -0,0 +1,40 @@
+package com.baeldung.core.pwd;
+
+import java.io.File;
+import java.nio.file.FileSystems;
+import java.nio.file.Paths;
+
+public final class CurrentDirectoryFetcher {
+
+    public static void main(String[] args) {
+        System.out.printf("Current Directory Using Java System API: %s%n", currentDirectoryUsingSystemProperties());
+
+        System.out.printf("Current Directory Using Java IO File API: %s%n", currentDirectoryUsingFile());
+
+        System.out.printf("Current Directory Using Java NIO FileSystems API: %s%n", currentDirectoryUsingFileSystems());
+
+        System.out.printf("Current Directory Using Java NIO Paths API: %s%n", currentDirectoryUsingPaths());
+    }
+
+    public static String currentDirectoryUsingSystemProperties() {
+        return System.getProperty("user.dir");
+    }
+
+    public static String currentDirectoryUsingPaths() {
+        return Paths.get("")
+            .toAbsolutePath()
+            .toString();
+    }
+
+    public static String currentDirectoryUsingFileSystems() {
+        return FileSystems.getDefault()
+            .getPath("")
+            .toAbsolutePath()
+            .toString();
+    }
+
+    public static String currentDirectoryUsingFile() {
+        return new File("").getAbsolutePath();
+    }
+
+}

core-java-modules/core-java-os/src/test/java/com/baeldung/core/pwd/CurrentDirectoryFetcherTest.java

@@ -0,0 +1,34 @@
+package com.baeldung.core.pwd;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class CurrentDirectoryFetcherTest {
+
+    private static final String CURRENT_DIR = "core-java-os";
+
+    @Test
+    public void whenUsingSystemProperties_thenReturnCurrentDirectory() {
+        assertTrue(CurrentDirectoryFetcher.currentDirectoryUsingSystemProperties()
+            .endsWith(CURRENT_DIR));
+    }
+
+    @Test
+    public void whenUsingJavaNioPaths_thenReturnCurrentDirectory() {
+        assertTrue(CurrentDirectoryFetcher.currentDirectoryUsingPaths()
+            .endsWith(CURRENT_DIR));
+    }
+
+    @Test
+    public void whenUsingJavaNioFileSystems_thenReturnCurrentDirectory() {
+        assertTrue(CurrentDirectoryFetcher.currentDirectoryUsingFileSystems()
+            .endsWith(CURRENT_DIR));
+    }
+
+    @Test
+    public void whenUsingJavaIoFile_thenReturnCurrentDirectory() {
+        assertTrue(CurrentDirectoryFetcher.currentDirectoryUsingFile()
+            .endsWith(CURRENT_DIR));
+    }
+}

core-java-modules/core-java/README.md

@@ -37,7 +37,6 @@
 - [Common Java Exceptions](http://www.baeldung.com/java-common-exceptions)
 - [Throw Exception in Optional in Java 8](https://www.baeldung.com/java-optional-throw-exception)
 - [Merging java.util.Properties Objects](https://www.baeldung.com/java-merging-properties)
-- [Merging java.util.Properties Objects](https://www.baeldung.com/java-merging-properties)
 - [Java – Try with Resources](https://www.baeldung.com/java-try-with-resources)
 - [Abstract Classes in Java](https://www.baeldung.com/java-abstract-class)
 - [Guide to Character Encoding](https://www.baeldung.com/java-char-encoding)

custom-pmd/src/main/java/org/baeldung/pmd/UnitTestNamingConventionRule.java

@@ -22,6 +22,10 @@ public class UnitTestNamingConventionRule extends AbstractJavaRule {
         String className = node.getImage();
         Objects.requireNonNull(className);
 
+        if (className.endsWith("SpringContextTest")) {
+            return data;
+        }
+        
         if (className.endsWith("Tests")
                 || (className.endsWith("Test") && allowedEndings.stream().noneMatch(className::endsWith))) {
             addViolation(data, node);

jackson-simple/src/test/java/com/baeldung/jackson/test/JacksonSerializationIgnoreUnitTest.java

@@ -165,7 +165,7 @@ public class JacksonSerializationIgnoreUnitTest {
     }
 
     @Test
-    public final void givenIgnoringNullFieldsOnClass_whenWritingObjectWithNullField_thenFieldIsIgnored() throws JsonProcessingException {
+    public final void givenNullsIgnoredOnClass_whenWritingObjectWithNullField_thenIgnored() throws JsonProcessingException {
         final ObjectMapper mapper = new ObjectMapper();
         final MyDtoIgnoreNull dtoObject = new MyDtoIgnoreNull();
 
@@ -178,7 +178,7 @@ public class JacksonSerializationIgnoreUnitTest {
     }
 
     @Test
-    public final void givenIgnoringNullFieldsGlobally_whenWritingObjectWithNullField_thenIgnored() throws JsonProcessingException {
+    public final void givenNullsIgnoredGlobally_whenWritingObjectWithNullField_thenIgnored() throws JsonProcessingException {
         final ObjectMapper mapper = new ObjectMapper();
         mapper.setSerializationInclusion(Include.NON_NULL);
         final MyDto dtoObject = new MyDto();

java-strings-2/src/test/java/com/baeldung/string/multiline/MultiLineStringUnitTest.java

@@ -1,4 +1,4 @@
-package com.baeldung.string;
+package com.baeldung.string.multiline;
 
 import org.junit.Test;
 import static org.junit.Assert.assertEquals;

libraries-io/README.md

@@ -1,4 +1,5 @@
 
 ### Relevant Articles: 
 
+- [Transferring a File Through SFTP in Java](https://www.baeldung.com/java-file-sftp)
 

libraries/README.md

@@ -42,7 +42,6 @@
 - [Introduction to Akka Actors in Java](http://www.baeldung.com/akka-actors-java)
 - [Introduction to Smooks](http://www.baeldung.com/smooks)
 - [A Guide to Infinispan in Java](http://www.baeldung.com/infinispan)
-- [Introduction to OpenCSV](http://www.baeldung.com/opencsv)
 - [A Guide to Unirest](http://www.baeldung.com/unirest)
 - [Introduction to Akka Actors in Java](http://www.baeldung.com/akka-actors-java)
 - [A Guide to Byte Buddy](http://www.baeldung.com/byte-buddy)

lombok/src/main/java/com/baeldung/lombok/getter/GetterLazy.java

@@ -13,9 +13,9 @@ public class GetterLazy {
     private static final String DELIMETER = ",";
 
     @Getter(lazy = true)
-    private final Map<String, Long> transactions = readTxnsFromFile();
+    private final Map<String, Long> transactions = getTransactions();
 
-    private Map<String, Long> readTxnsFromFile() {
+    private Map<String, Long> getTransactions() {
 
         final Map<String, Long> cache = new HashMap<>();
         List<String> txnRows = readTxnListFromFile();

lombok/src/main/java/com/baeldung/lombok/intro/Utility.java

@@ -0,0 +1,26 @@
+package com.baeldung.lombok.intro;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.stream.Collectors;
+
+import lombok.SneakyThrows;
+import lombok.Synchronized;
+
+public class Utility {
+
+    @SneakyThrows
+    public String resourceAsString() throws IOException {
+        try (InputStream is = this.getClass().getResourceAsStream("sure_in_my_jar.txt")) {
+            BufferedReader br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
+            return br.lines().collect(Collectors.joining("\n"));
+        } 
+    }
+
+    @Synchronized
+    public void putValueInCache(String key, String value) {
+        System.out.println("Thread safe here with key : [" + key + "] and value[" + value + "]");
+    }
+}

lombok/src/main/resources/sure_in_my_jar.txt

@@ -0,0 +1 @@
+Hello

parent-spring-4/pom.xml

@@ -28,8 +28,31 @@
         </dependency>
     </dependencies>
 
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.codehaus.cargo</groupId>
+                <artifactId>cargo-maven2-plugin</artifactId>
+                <version>${cargo-maven2-plugin.version}</version>
+                <configuration>
+                    <wait>true</wait>
+                    <container>
+                        <containerId>jetty8x</containerId>
+                        <type>embedded</type>
+                    </container>
+                    <configuration>
+                        <properties>
+                            <cargo.servlet.port>8082</cargo.servlet.port>
+                        </properties>
+                    </configuration>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
     <properties>
         <spring.version>4.3.22.RELEASE</spring.version>
+        <cargo-maven2-plugin.version>1.6.1</cargo-maven2-plugin.version>
     </properties>
 
 </project>

patterns/design-patterns/src/main/java/com/baeldung/chainofresponsibility/AuthenticationProcessor.java

@@ -1,4 +1,4 @@
-package com.baeldung.pattern.chainofresponsibility;
+package com.baeldung.chainofresponsibility;
 
 public abstract class AuthenticationProcessor {
 

patterns/design-patterns/src/main/java/com/baeldung/chainofresponsibility/AuthenticationProvider.java

@@ -1,4 +1,4 @@
-package com.baeldung.pattern.chainofresponsibility;
+package com.baeldung.chainofresponsibility;
 
 public interface AuthenticationProvider {
 

patterns/design-patterns/src/main/java/com/baeldung/chainofresponsibility/OAuthAuthenticationProcessor.java

@@ -1,4 +1,4 @@
-package com.baeldung.pattern.chainofresponsibility;
+package com.baeldung.chainofresponsibility;
 
 public class OAuthAuthenticationProcessor extends AuthenticationProcessor {
 

patterns/design-patterns/src/main/java/com/baeldung/chainofresponsibility/OAuthTokenProvider.java

@@ -1,4 +1,4 @@
-package com.baeldung.pattern.chainofresponsibility;
+package com.baeldung.chainofresponsibility;
 
 public class OAuthTokenProvider implements AuthenticationProvider {
 

patterns/design-patterns/src/main/java/com/baeldung/chainofresponsibility/SamlAuthenticationProvider.java

@@ -1,4 +1,4 @@
-package com.baeldung.pattern.chainofresponsibility;
+package com.baeldung.chainofresponsibility;
 
 public class SamlAuthenticationProvider implements AuthenticationProvider {
 

patterns/design-patterns/src/main/java/com/baeldung/chainofresponsibility/UsernamePasswordAuthenticationProcessor.java

@@ -1,4 +1,4 @@
-package com.baeldung.pattern.chainofresponsibility;
+package com.baeldung.chainofresponsibility;
 
 public class UsernamePasswordAuthenticationProcessor extends AuthenticationProcessor {
 

patterns/design-patterns/src/main/java/com/baeldung/chainofresponsibility/UsernamePasswordProvider.java

@@ -1,4 +1,4 @@
-package com.baeldung.pattern.chainofresponsibility;
+package com.baeldung.chainofresponsibility;
 
 public class UsernamePasswordProvider implements AuthenticationProvider {
 

patterns/design-patterns/src/main/java/com/baeldung/command/client/TextFileApplication.java

@@ -1,10 +1,10 @@
-package com.baeldung.pattern.command.client;
+package com.baeldung.command.client;
 
-import com.baeldung.pattern.command.command.OpenTextFileOperation;
-import com.baeldung.pattern.command.command.SaveTextFileOperation;
-import com.baeldung.pattern.command.command.TextFileOperation;
-import com.baeldung.pattern.command.invoker.TextFileOperationExecutor;
-import com.baeldung.pattern.command.receiver.TextFile;
+import com.baeldung.command.command.OpenTextFileOperation;
+import com.baeldung.command.command.SaveTextFileOperation;
+import com.baeldung.command.command.TextFileOperation;
+import com.baeldung.command.invoker.TextFileOperationExecutor;
+import com.baeldung.command.receiver.TextFile;
 
 public class TextFileApplication {
     

patterns/design-patterns/src/main/java/com/baeldung/command/command/OpenTextFileOperation.java

@@ -1,6 +1,6 @@
-package com.baeldung.pattern.command.command;
+package com.baeldung.command.command;
 
-import com.baeldung.pattern.command.receiver.TextFile;
+import com.baeldung.command.receiver.TextFile;
 
 public class OpenTextFileOperation implements TextFileOperation {
 

patterns/design-patterns/src/main/java/com/baeldung/command/command/SaveTextFileOperation.java

@@ -1,6 +1,6 @@
-package com.baeldung.pattern.command.command;
+package com.baeldung.command.command;
 
-import com.baeldung.pattern.command.receiver.TextFile;
+import com.baeldung.command.receiver.TextFile;
 
 public class SaveTextFileOperation implements TextFileOperation {
     

patterns/design-patterns/src/main/java/com/baeldung/command/command/TextFileOperation.java

@@ -1,4 +1,4 @@
-package com.baeldung.pattern.command.command;
+package com.baeldung.command.command;
 
 @FunctionalInterface
 public interface TextFileOperation {

patterns/design-patterns/src/main/java/com/baeldung/command/invoker/TextFileOperationExecutor.java

@@ -1,6 +1,6 @@
-package com.baeldung.pattern.command.invoker;
+package com.baeldung.command.invoker;
 
-import com.baeldung.pattern.command.command.TextFileOperation;
+import com.baeldung.command.command.TextFileOperation;
 import java.util.ArrayList;
 import java.util.List;
 

patterns/design-patterns/src/main/java/com/baeldung/command/receiver/TextFile.java

@@ -1,4 +1,4 @@
-package com.baeldung.pattern.command.receiver;
+package com.baeldung.command.receiver;
 
 public class TextFile {