The examples that come with GNU Classpath are in subpackages of gnu.classpath.examples. They can't be run by JikesRVM because it blocks the prefix 'gnu.classpath' to just VM_BootClassLoader. Likewise, trying to build the RVM with itself fails because the Ant tasks are in org.jikesrvm.tools.ant, where org.jikesrvm is blocked. The attached patch gives a simple fix to this, but there is probably a better way (maybe autogenerating classes that should be from the bootloader during build?)