Thanks, A doesn't work but I added "-Xmx5G" to the DEFAULT_JVM_OPTS in the "gradlew" and changed the distributionUrl in gradle/wrapper from ".../gradle-1.10-bin.zip" to ".../gradle-1.11-bin.zip". Also i added the environment variable (i dont know if this is the correct word...it's translatet directly from the german word ^^) "_JAVA_OPTIONS" with the value "-Xincgc -Xms2048m -Xmx4096m". I don't actally know what i've done but the BUILD was SUCCESSFUL.
Thanks i love you