Eclipse RCP export failure

Even though the JCrypTool runtime in Eclipse is working perfectly fine, exporting the product via the Product Configuration Editor fails on OS X 10.8.2 with Java 1.7.0_09 (the same happened with 1.7.0_07). Every export crashes after 2 percent with the following exception:

/[…]/.metadata/.plugins/org.eclipse.pde.core/temp/org.eclipse.pde.container.feature/compile.org.eclipse.pde.[…]/build.xml:31: /Library/Java/JavaVirtualMachines/jdk1.7.0_09.jdk/Contents/Home/Classes does not exist.
The following error occurred while executing this line:
/[…]/build.xml:31: /Library/Java/JavaVirtualMachines/jdk1.7.0_09.jdk/Contents/Home/Classes does not exist.

I‘ve already re-installed Eclipse 4.2.1 Classic, tried Eclipse 4.2.1 for RCP Developers, deleted the workspace, cleaned projects, everything that came into my mind. No success. Any ideas?