Add missing code snippets (#9228)

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

@@ -3,6 +3,3 @@ spring.properties.refreshDelay=1000
 spring.config.location=file:extra.properties
 spring.main.allow-bean-definition-overriding=true
 
-database.url=jdbc:postgresql:/localhost:5432/instance
-database.username=foo
-database.password=bar

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

@@ -7,10 +7,14 @@
       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"/>
+    <context:property-placeholder location="classpath:foo.properties,classpath:bar.properties, classpath:database.properties"/>
 
     <bean id="componentInXmlUsingProperties" class="com.baeldung.properties.core.ComponentInXmlUsingProperties">
         <constructor-arg value="${key.something}"/>
     </bean>
 
+    <bean id="dataSource" class="com.baeldung.configurationproperties.Database">
+        <property name="url" value="${jdbc.url}" />
+    </bean>
+
 </beans>

spring-boot-modules/spring-boot-properties/src/main/resources/configForPropertyPlaceholderBeans.xml

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans"
+       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd"
+>
+
+<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
+    <property name="locations">
+        <list>
+            <value>classpath:foo.properties</value>
+        </list>
+    </property>
+    <property name="ignoreUnresolvablePlaceholders" value="true"/>
+</bean>
+
+<bean class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer">
+    <property name="locations">
+        <list>
+            <value>classpath:foo.properties</value>
+        </list>
+    </property>
+    <property name="ignoreUnresolvablePlaceholders" value="true"/>
+</bean>
+</beans>

spring-boot-modules/spring-boot-properties/src/main/resources/configuration-processor.properties

@@ -0,0 +1,3 @@
+com.baeldung.url=www.abc.test.com
+com.baeldung.jdbc.url=
+com.baeldung.timeout-in-milli-seconds=2000

spring-boot-modules/spring-boot-properties/src/main/resources/database.properties

@@ -0,0 +1,4 @@
+database.url=jdbc:postgresql:/localhost:5432/instance
+database.username=foo
+database.password=bar
+jdbc.url=jdbc:postgresql:/localhost:5432

spring-boot-modules/spring-boot-properties/src/main/resources/database.yml

@@ -0,0 +1,5 @@
+database:
+    url: jdbc:postresql:/localhost:5432/instance
+    username: foo
+    password: bar
+secret: foo