ITs fail on Java 11

[lasselindqvist]

ITs fail on Java 11:

[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] Source option 6 is no longer supported. Use 7 or later.
[ERROR] Target option 6 is no longer supported. Use 7 or later.
[INFO] 2 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 38.369 s
[INFO] Finished at: 2021-09-26T19:52:55+03:00
[INFO] ------------------------------------------------------------------------
[WARNING] The requested profile "integration-test" could not be activated because it does not exist.
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project simple: Compilation failure: Compilation failure:
[ERROR] Source option 6 is no longer supported. Use 7 or later.
[ERROR] Target option 6 is no longer supported. Use 7 or later.
[ERROR] -> [Help 1]

[lasselindqvist]

With Java 11 fails to:

 [proguard] Initializing...
 [proguard] Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/logging/log4j/LogManager
 [proguard] 	at proguard.classfile.editor.CodeAttributeEditor.<clinit>(CodeAttributeEditor.java:113)
 [proguard] 	at proguard.classfile.util.DynamicMemberReferenceInitializer.<init>(DynamicMemberReferenceInitializer.java:87)
 [proguard] 	at proguard.Initializer.execute(Initializer.java:246)
 [proguard] 	at proguard.ProGuard.initialize(ProGuard.java:327)
 [proguard] 	at proguard.ProGuard.execute(ProGuard.java:132)
 [proguard] 	at proguard.ProGuard.main(ProGuard.java:717)
 [proguard] Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.LogManager
 [proguard] 	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:606)
 [proguard] 	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:168)
 [proguard] 	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
 [proguard] 	... 6 more

We need to start also adding some other JARs to classpath, Now we only add the ones from getProguardJars method. This is why also Kotlin obfuscation might have failed even previously.

		for (File p : proguardJars)
			java.createClasspath().createPathElement().setLocation(p);

[lasselindqvist]

See also #122