Eclipse Variables

org.eclipse.core.variables.IStringVariableManager svm = org.eclipse.core.variables.VariablesPlugin
    .getDefault().getStringVariableManager();
try {
  System.out.println(svm.performStringSubstitution("${eclipse_home}"));
} catch (CoreException e) {
  e.printStackTrace();
}

// Console Output
/C:/java/eclipse/