Program: 9611
Project: 9611
Buggy source:
/** 
 * Generate AjBuildConfig from the local configFile parameter plus global project and build options. Errors signalled using signal... methods.
 * @param configFile
 * @return null if invalid configuration, corresponding AjBuildConfig otherwise
 */
public AjBuildConfig genBuildConfig(String configFile){
  init();
  File config=new File(configFile);
  if (!config.exists()) {
    signalError("String_Node_Str" + configFile + "String_Node_Str");
    return null;
  }
  String[] args=new String[]{"String_Node_Str" + config.getAbsolutePath()};
  CountingMessageHandler counter=CountingMessageHandler.makeCountingMessageHandler(messageHandler);
  BuildArgParser parser=new BuildArgParser();
  AjBuildConfig local=parser.genBuildConfig(args,counter,false);
  if (counter.hasErrors()) {
    return null;
  }
  local.setConfigFile(config);
  AjBuildConfig global=new AjBuildConfig();
  BuildOptionsAdapter buildOptions=Ajde.getDefault().getBuildManager().getBuildOptions();
  if (!configureBuildOptions(global,buildOptions,counter)) {
    return null;
  }
  ProjectPropertiesAdapter projectOptions=Ajde.getDefault().getProjectProperties();
  configureProjectOptions(global,projectOptions);
  local.installGlobals(global);
  String errs=local.configErrors();
  if (null != errs) {
    MessageUtil.error(counter,errs);
    return null;
  }
  local.setGenerateModelMode(true);
  return fixupBuildConfig(local,global,buildOptions,projectOptions);
}

Fixed version (ground truth):
/** 
 * Generate AjBuildConfig from the local configFile parameter plus global project and build options. Errors signalled using signal... methods.
 * @param configFile
 * @return null if invalid configuration, corresponding AjBuildConfig otherwise
 */
public AjBuildConfig genBuildConfig(String configFilePath){
  init();
  File configFile=new File(configFilePath);
  if (!configFile.exists()) {
    signalError("String_Node_Str" + configFile + "String_Node_Str");
    return null;
  }
  String[] args=new String[]{"String_Node_Str" + configFile.getAbsolutePath()};
  CountingMessageHandler handler=CountingMessageHandler.makeCountingMessageHandler(messageHandler);
  BuildArgParser parser=new BuildArgParser();
  AjBuildConfig config=parser.genBuildConfig(args,handler,false,configFile);
  configureProjectOptions(config,Ajde.getDefault().getProjectProperties());
  AjBuildConfig global=new AjBuildConfig();
  BuildOptionsAdapter buildOptions=Ajde.getDefault().getBuildManager().getBuildOptions();
  if (!configureBuildOptions(global,buildOptions,handler)) {
    return null;
  }
  ProjectPropertiesAdapter projectOptions=Ajde.getDefault().getProjectProperties();
  configureProjectOptions(global,projectOptions);
  config.installGlobals(global);
  ISourceLocation location=null;
  if (config.getConfigFile() != null) {
    location=new SourceLocation(config.getConfigFile(),0);
  }
  String message=parser.getOtherMessages(true);
  if (null != message) {
    IMessage m=new Message(message,IMessage.ERROR,null,location);
    handler.handleMessage(m);
  }
  config.setGenerateModelMode(true);
  if (Ajde.getDefault().getBuildManager().getBuildOptions().getJavaOptionsMap() != null) {
    config.getJavaOptions().putAll(Ajde.getDefault().getBuildManager().getBuildOptions().getJavaOptionsMap());
  }
  return config;
}