Make sure Maven integration tests use a consistent java version

Closes gh-9149

spring-boot-tools/spring-boot-maven-plugin/src/it/build-info-additional-properties/pom.xml

@@ -8,6 +8,8 @@
 	<name>Generate build info</name>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/build-info-cutom-file/pom.xml

@@ -8,6 +8,8 @@
 	<name>Generate custom build info</name>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/build-info/pom.xml

@@ -8,6 +8,8 @@
 	<name>Generate build info</name>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-attach-disabled/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-create-dir/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-custom-dir/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-custom-launcher/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-exclude-artifact/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-exclude-entry/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-exclude-group/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-executable/pom.xml

@@ -9,6 +9,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-lib-name-conflict/pom.xml

@@ -8,6 +8,8 @@
 	<packaging>pom</packaging>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 
 	<modules>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-lib-name-conflict/test-project/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-non-executable/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-system-scope-default/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-system-scope/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-test-scope/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar-with-unpack/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/jar/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/prop/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/run-devtools/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<!-- Devtools cannot be added here but the project has the class
 	     that the code is looking for -->

spring-boot-tools/spring-boot-maven-plugin/src/it/run-disable-fork/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/run-exclude/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/run-fork/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/run-jvmargs/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/run-profiles-fork/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/run-profiles/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/run-use-test-classpath/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/run-working-directory/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/run/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/start-stop-automatic-fork/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/start-stop-fork/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/start-stop-skip/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/start-stop/pom.xml

@@ -7,6 +7,8 @@
 	<version>0.0.1.BUILD-SNAPSHOT</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/war-reactor/pom.xml

@@ -8,6 +8,8 @@
 	<packaging>pom</packaging>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<modules>
 		<module>jar</module>

spring-boot-tools/spring-boot-maven-plugin/src/it/war-with-unpack/pom.xml

@@ -8,6 +8,8 @@
 	<packaging>war</packaging>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>

spring-boot-tools/spring-boot-maven-plugin/src/it/war/pom.xml

@@ -8,6 +8,8 @@
 	<packaging>war</packaging>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<maven.compiler.source>@java.version@</maven.compiler.source>
+		<maven.compiler.target>@java.version@</maven.compiler.target>
 	</properties>
 	<build>
 		<plugins>