Compile samples and integration tests with Java 8

Update the samples and integration tests to use Java 8. There's no
specific reason to keep them on Java 6 and it helps keep Eclipse happy
if we upgrade.

spring-boot-integration-tests/pom.xml

@@ -18,6 +18,7 @@
 	</organization>
 	<properties>
 		<main.basedir>${basedir}/..</main.basedir>
+		<java.version>1.8</java.version>
 	</properties>
 	<modules>
 		<module>spring-boot-gradle-tests</module>

spring-boot-samples/pom.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 	<modelVersion>4.0.0</modelVersion>
 	<parent>
 		<groupId>org.springframework.boot</groupId>
@@ -18,6 +19,7 @@
 	</organization>
 	<properties>
 		<main.basedir>${basedir}/..</main.basedir>
+		<java.version>1.8</java.version>
 	</properties>
 	<modules>
 		<module>spring-boot-sample-actuator</module>

spring-boot-samples/spring-boot-sample-jersey/pom.xml

@@ -18,7 +18,6 @@
 	</organization>
 	<properties>
 		<main.basedir>${basedir}/../..</main.basedir>
-		<java.version>1.7</java.version>
 	</properties>
 	<dependencies>
 		<dependency>

spring-boot-samples/spring-boot-sample-jta-jndi/pom.xml

@@ -17,7 +17,6 @@
 		<url>http://www.spring.io</url>
 	</organization>
 	<properties>
-		<java.version>1.7</java.version>
 		<main.basedir>${basedir}/../..</main.basedir>
 	</properties>
 	<dependencies>

spring-boot-samples/spring-boot-sample-servlet/pom.xml

@@ -18,7 +18,6 @@
 	</organization>
 	<properties>
 		<main.basedir>${basedir}/../..</main.basedir>
-		<java.version>1.7</java.version>
 		<m2eclipse.wtp.contextRoot>/</m2eclipse.wtp.contextRoot>
 	</properties>
 	<dependencies>

spring-boot-samples/spring-boot-sample-tomcat-jsp/pom.xml

@@ -19,7 +19,6 @@
 	<properties>
 		<main.basedir>${basedir}/../..</main.basedir>
 		<m2eclipse.wtp.contextRoot>/</m2eclipse.wtp.contextRoot>
-		<java.version>1.7</java.version>
 	</properties>
 	<dependencies>
 		<dependency>

spring-boot-samples/spring-boot-sample-tomcat7-jsp/pom.xml

@@ -20,7 +20,6 @@
 		<main.basedir>${basedir}/../..</main.basedir>
 		<m2eclipse.wtp.contextRoot>/</m2eclipse.wtp.contextRoot>
 		<tomcat.version>7.0.59</tomcat.version>
-		<java.version>1.7</java.version>
 	</properties>
 	<dependencies>
 		<dependency>

spring-boot-samples/spring-boot-sample-web-jsp/pom.xml

@@ -18,7 +18,6 @@
 	</organization>
 	<properties>
 		<main.basedir>${basedir}/../..</main.basedir>
-		<java.version>1.7</java.version>
 		<m2eclipse.wtp.contextRoot>/</m2eclipse.wtp.contextRoot>
 	</properties>
 	<dependencies>

spring-boot-samples/spring-boot-sample-web-static/pom.xml

@@ -17,7 +17,6 @@
 		<url>http://www.spring.io</url>
 	</organization>
 	<properties>
-		<java.version>1.7</java.version>
 		<main.basedir>${basedir}/../..</main.basedir>
 	</properties>
 	<dependencies>

spring-boot-samples/spring-boot-sample-websocket-jetty/pom.xml

@@ -17,7 +17,6 @@
 	</organization>
 	<properties>
 		<main.basedir>${basedir}/../..</main.basedir>
-		<java.version>1.7</java.version>
 	</properties>
 	<dependencies>
 		<dependency>

spring-boot-samples/spring-boot-sample-websocket-tomcat/pom.xml

@@ -17,7 +17,6 @@
 	</organization>
 	<properties>
 		<main.basedir>${basedir}/../..</main.basedir>
-		<java.version>1.7</java.version>
 	</properties>
 	<dependencies>
 		<dependency>

spring-boot-samples/spring-boot-sample-websocket-undertow/pom.xml

@@ -17,7 +17,6 @@
 	</organization>
 	<properties>
 		<main.basedir>${basedir}/../..</main.basedir>
-		<java.version>1.7</java.version>
 	</properties>
 	<dependencies>
 		<dependency>