Bug 23320 Incomplete classpath and circular classpath options should be surfaced
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/preferences/CompilerPreferencePage.java
private static final String OPTIMIZE_OUT= JavaCore.OPTIMIZE_OUT;
	
	private static final String VERSION_1_1= JavaCore.VERSION_1_1;
	private static final String VERSION_1_2= JavaCore.VERSION_1_2;
	private static final String VERSION_1_3= JavaCore.VERSION_1_3;
	private static final String VERSION_1_4= JavaCore.VERSION_1_4;
	
	private static final String ERROR= JavaCore.ERROR;
	private static final String WARNING= JavaCore.WARNING;
	private static final String IGNORE= JavaCore.IGNORE;
	private static final String ABORT= JavaCore.ABORT;
	
	private static final String DEFAULT= "default"; 
	private static final String USER= "user";	 
	private static String[] getAllKeys() {
		return new String[] {
			PREF_LOCAL_VARIABLE_ATTR, PREF_LINE_NUMBER_ATTR, PREF_SOURCE_FILE_ATTR, PREF_CODEGEN_UNUSED_LOCAL,
			PREF_CODEGEN_TARGET_PLATFORM, PREF_PB_UNREACHABLE_CODE, PREF_PB_INVALID_IMPORT, PREF_PB_OVERRIDING_PACKAGE_DEFAULT_METHOD,
			PREF_PB_METHOD_WITH_CONSTRUCTOR_NAME, PREF_PB_DEPRECATION, PREF_PB_HIDDEN_CATCH_BLOCK, PREF_PB_UNUSED_LOCAL,
			PREF_PB_UNUSED_PARAMETER, PREF_PB_SYNTHETIC_ACCESS_EMULATION, PREF_PB_NON_EXTERNALIZED_STRINGS,
			PREF_PB_ASSERT_AS_IDENTIFIER, PREF_PB_UNUSED_IMPORT, PREF_PB_MAX_PER_UNIT, PREF_SOURCE_COMPATIBILITY, PREF_COMPLIANCE, 
			PREF_RESOURCE_FILTER, PREF_BUILD_INVALID_CLASSPATH, PREF_PB_STATIC_ACCESS_RECEIVER
		};	
	}
	/**
	 * Initializes the current options (read from preference store)
	 */
	public static void initDefaults(IPreferenceStore store) {
	}
	private static class ControlData {