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I am trying to update my eclipse to work with a jdk and not a jre. I followed the instruction in this forum , also search google for answers but for some reason it still don't work. I try'ed going to preferences ->java->install jre's , removing the old jre from there and using the path for the jdk. also try'ed going to project properties -> java build path -> jre system libraries -> edit-> workspace default jre.it also says there i'm using jdk. I even try'ed adding to the ini file the next path C:\Program Files\Java\jdk1.6.0_31\bin\javaw.exe but when i try'ed deploying my program to app engine i get the next message : Unable to update app: Cannot get the System Java Compiler. Please use a JDK, not a JRE. my eclipse version is juno 4.2 and my jdk version is 1.6.0_31 I don't know what else i need to change. I even uninstall my older jre from my computer but eclipse still don't work with the jdk ( although it recognize it ) I'm out of idea's ... anyone could help me please ?? this is my ini file : -startup plugins/org.eclipse.equinox.launcher_1.3.0.v20120522-1813.jar --launcher.library plugins/org.eclipse.equinox.launcher.win32.win32.x86_1.1.200.v20120522-1813 -product org.eclipse.epp.package.jee.product --launcher.defaultAction openFile --launcher.XXMaxPermSize 256M -showsplash org.eclipse.platform --launcher.XXMaxPermSize 256m --launcher.defaultAction openFile -vmargs -Dosgi.requiredJavaVersion=1.5 -Dhelp.lucene.tokenizer=standard -Xms40m -Xmx512m -vm C:\Program Files\Java\jdk1.6.0_31\bin thanks for the help

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