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I'm getting into Java7 development and I've added JDK7 into Java Platforms and have selected it in the project properties. But when I'm compiling, I get messages like: warning: java/lang/Boolean.class(java/lang:Boolean.class): major version 51 is newer than 50, the highest major version supported by this compiler. It is recommended that the compiler be upgraded. and javac: invalid target release: 1.7 /Applications/NetBeans/NetBeans 7.1.app/Contents/Resources/NetBeans/harness/suite.xml:184: The following error occurred while executing this line: /Applications/NetBeans/NetBeans 7.1.app/Contents/Resources/NetBeans/harness/common.xml:206: Compile failed; see the compiler error output for details. So as far as I understand Netbeans is using javac 1.6. How can I change in to 1.7? EDIT: I'm writing a NetBeans Platform app and in main app Properties I've set: Java Platform = JDK 1.7 . And in one of the module's Properties I've set Source level = 1.7 . EDIT2 Mac OS 10.7.3 NetBeans IDE 7.1 (Build 201112071828) openjdk version "1.7.0-internal" OpenJDK Runtime Environment (build 1.7.0-internal-uko_2012_02_15_11_51-b00) OpenJDK 64-Bit Server VM (build 23.0-b15, mixed mode) suite.xml (184 is the second line here) <target name="build" depends="-init,branding,release,-hide-excluded-modules" description="Build all modules in the suite."> <subant target="netbeans" buildpath="${modules.sorted}" inheritrefs="false" inheritall="false"> <property name="cluster.path.evaluated" value="${cluster.path.evaluated}"/>  </subant> </target> com

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