Add java.version to Tomcat WAR projects

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

@@ -18,6 +18,7 @@
 		<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

@@ -18,6 +18,7 @@
 	</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-jsp/pom.xml

@@ -18,6 +18,7 @@
 	</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

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