Bug 123786 Following bug 109980, the compliance 6.0 should be added to the compiler's compliance list.
If the JRE/JDK used is a 1.6/6.0 VM, then the compliance 6.0 should be available. Compliance 1.6 implies source level 1.6 and target level 1.6.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/JavaProjectWizardFirstPage.java
jre50Text.setLayoutData(gridData);
			fHintText= jre50Text;
			
			handlePossibleJVMChange();
		}
		
		public void handlePossibleJVMChange() {
			String selectedCompliance= fJREGroup.getSelectedCompilerCompliance();
			if (selectedCompliance == null) {
				selectedCompliance= JavaCore.getOption(JavaCore.COMPILER_COMPLIANCE);
			}
			IVMInstall selectedJVM= fJREGroup.getSelectedJVM();
			if (selectedJVM == null) {
				selectedJVM= JavaRuntime.getDefaultVMInstall();
			}
			String jvmCompliance= JavaCore.VERSION_1_4;
			if (selectedJVM instanceof IVMInstall2) {
				jvmCompliance= JavaModelUtil.getCompilerCompliance((IVMInstall2) selectedJVM, JavaCore.VERSION_1_4);
			}
			if (!selectedCompliance.equals(jvmCompliance) && (selectedCompliance.equals(JavaCore.VERSION_1_5) || jvmCompliance.equals(JavaCore.VERSION_1_5))) {
				if (selectedCompliance.equals(JavaCore.VERSION_1_5))
					selectedCompliance= "5.0"; 
				
				fHintText.setText(Messages.format(NewWizardMessages.JavaProjectWizardFirstPage_DetectGroup_jre_message, new String[] {selectedCompliance, jvmCompliance}));
				fHintText.setVisible(true);
			} else {
				fHintText.setVisible(false);
			}
		}