Program: 126033
Project: 126033
Buggy source:
/** 
 * Clear compliance settings from project, and set them into Eclipse compliance settings
 * @param javaProject
 */
private static void clearProjectIndenpendComplianceSettings(IJavaProject javaProject){
  Map<String,String> projectComplianceOptions=javaProject.getOptions(false);
  if (projectComplianceOptions == null || projectComplianceOptions.isEmpty()) {
    return;
  }
  String compilerCompliance=javaProject.getOption(JavaCore.COMPILER_COMPLIANCE,false);
  Set<String> keySet=projectComplianceOptions.keySet();
  for (  String key : keySet) {
    javaProject.setOption(key,null);
  }
  IEclipsePreferences runProcessPreferences=InstanceScope.INSTANCE.getNode(DesignerMavenPlugin.PLUGIN_ID);
  boolean isAlreadySetEclipsePreferences=runProcessPreferences.getBoolean(IS_ALREADY_SET_ECLIPSE_COMPLIANCE,false);
  if (!isAlreadySetEclipsePreferences) {
    IEclipsePreferences eclipsePreferences=InstanceScope.INSTANCE.getNode(JavaCore.PLUGIN_ID);
    runProcessPreferences.putBoolean(IS_ALREADY_SET_ECLIPSE_COMPLIANCE,true);
    if (compilerCompliance != null) {
      Map<String,String> complianceOptions=new HashMap<String,String>();
      JavaCore.setComplianceOptions(compilerCompliance,complianceOptions);
      if (!complianceOptions.isEmpty()) {
        Set<Entry<String,String>> entrySet=complianceOptions.entrySet();
        for (        Entry<String,String> entry : entrySet) {
          eclipsePreferences.put(entry.getKey(),entry.getValue());
        }
      }
      try {
        eclipsePreferences.flush();
        runProcessPreferences.flush();
      }
 catch (      BackingStoreException e) {
        ExceptionHandler.process(e);
      }
    }
  }
}

Fixed version (ground truth):
/** 
 * Clear compliance settings from project, and set them into Eclipse compliance settings
 * @param javaProject
 */
private static void clearProjectIndenpendComplianceSettings(IJavaProject javaProject){
  Map<String,String> projectComplianceOptions=javaProject.getOptions(false);
  if (projectComplianceOptions == null || projectComplianceOptions.isEmpty()) {
    return;
  }
  String compilerCompliance=javaProject.getOption(JavaCore.COMPILER_COMPLIANCE,false);
  Set<String> keySet=projectComplianceOptions.keySet();
  for (  String key : keySet) {
    javaProject.setOption(key,null);
  }
  IEclipsePreferences pluginPreferences=InstanceScope.INSTANCE.getNode(DesignerMavenPlugin.PLUGIN_ID);
  boolean isAlreadySetEclipsePreferences=pluginPreferences.getBoolean(IS_ALREADY_SET_ECLIPSE_COMPLIANCE,false);
  if (!isAlreadySetEclipsePreferences) {
    pluginPreferences.putBoolean(IS_ALREADY_SET_ECLIPSE_COMPLIANCE,true);
    if (compilerCompliance != null) {
      IEclipsePreferences eclipsePreferences=InstanceScope.INSTANCE.getNode(JavaCore.PLUGIN_ID);
      Map<String,String> complianceOptions=new HashMap<String,String>();
      JavaCore.setComplianceOptions(compilerCompliance,complianceOptions);
      if (!complianceOptions.isEmpty()) {
        Set<Entry<String,String>> entrySet=complianceOptions.entrySet();
        for (        Entry<String,String> entry : entrySet) {
          eclipsePreferences.put(entry.getKey(),entry.getValue());
        }
      }
      try {
        eclipsePreferences.flush();
        pluginPreferences.flush();
      }
 catch (      BackingStoreException e) {
        ExceptionHandler.process(e);
      }
    }
  }
}