public JavaFileManagerImpl(Project project) { myManager = PsiManagerEx.getInstanceEx(project); myPackageIndex = PackageIndex.getInstance(myManager.getProject()); project .getMessageBus() .connect() .subscribe( ProjectTopics.PROJECT_ROOTS, new ModuleRootAdapter() { @Override public void rootsChanged(final ModuleRootEvent event) { myNontrivialPackagePrefixes = null; } }); }