Program: 9979
Project: 9979
Buggy source:
public void execute() throws MojoExecutionException, MojoFailureException {
  if (!PathUtil.existAny(getSourcePath())) {
    getLog().warn("String_Node_Str" + Arrays.toString(getSourcePath()));
    return;
  }
  executeCompiler(new MxmlcConfigurationHolder(this,getSourceFile()),true);
  if (getLocalesRuntime() != null) {
    List<Result> results=new ArrayList<Result>();
    for (    String locale : getLocalesRuntime()) {
      MxmlcMojo cfg=this.clone();
      configureResourceBundle(locale,cfg);
      results.add(executeCompiler(new MxmlcConfigurationHolder(cfg,null),fullSynchronization));
    }
    wait(results);
  }
  if (modules != null) {
    List<Result> results=new ArrayList<Result>();
    for (    Module module : modules) {
      if (module.isOptimize() == null) {
        module.setOptimize(modulesLoadExterns);
      }
      File moduleSource=SourceFileResolver.resolveSourceFile(project.getCompileSourceRoots(),module.getSourceFile());
      String classifier=FilenameUtils.getBaseName(moduleSource.getName()).toLowerCase();
      String moduleFinalName;
      if (module.getFinalName() != null) {
        moduleFinalName=module.getFinalName();
      }
 else {
        moduleFinalName=project.getBuild().getFinalName() + "String_Node_Str" + classifier;
      }
      File moduleOutputDir;
      if (module.getDestinationPath() != null) {
        moduleOutputDir=new File(project.getBuild().getDirectory(),module.getDestinationPath());
      }
 else {
        moduleOutputDir=new File(project.getBuild().getDirectory());
      }
      List<String> loadExterns=new ArrayList<String>();
      loadExterns.add(getLinkReport());
      if (getLoadExterns() != null) {
        loadExterns.addAll(Arrays.asList(getLoadExterns()));
      }
      MxmlcMojo cfg=this.clone();
      cfg.classifier=classifier;
      cfg.targetDirectory=moduleOutputDir;
      cfg.finalName=moduleFinalName;
      if (module.isOptimize()) {
        cfg.getCache().put("String_Node_Str",loadExterns.toArray(new String[1]));
      }
      results.add(executeCompiler(new MxmlcConfigurationHolder(cfg,moduleSource),fullSynchronization));
    }
    wait(results);
  }
}

Fixed version (ground truth):
public void execute() throws MojoExecutionException, MojoFailureException {
  if (!PathUtil.existAny(getSourcePath())) {
    getLog().warn("String_Node_Str" + Arrays.toString(getSourcePath()));
    return;
  }
  executeCompiler(new MxmlcConfigurationHolder(this,getSourceFile()),true);
  if (!file(getOutput()).exists()) {
    throw new IllegalStateException("String_Node_Str");
  }
  if (getLocalesRuntime() != null) {
    List<Result> results=new ArrayList<Result>();
    for (    String locale : getLocalesRuntime()) {
      MxmlcMojo cfg=this.clone();
      configureResourceBundle(locale,cfg);
      results.add(executeCompiler(new MxmlcConfigurationHolder(cfg,null),fullSynchronization));
    }
    wait(results);
  }
  if (modules != null) {
    List<Result> results=new ArrayList<Result>();
    for (    Module module : modules) {
      if (module.isOptimize() == null) {
        module.setOptimize(modulesLoadExterns);
      }
      File moduleSource=SourceFileResolver.resolveSourceFile(project.getCompileSourceRoots(),module.getSourceFile());
      String classifier=FilenameUtils.getBaseName(moduleSource.getName()).toLowerCase();
      String moduleFinalName;
      if (module.getFinalName() != null) {
        moduleFinalName=module.getFinalName();
      }
 else {
        moduleFinalName=project.getBuild().getFinalName() + "String_Node_Str" + classifier;
      }
      File moduleOutputDir;
      if (module.getDestinationPath() != null) {
        moduleOutputDir=new File(project.getBuild().getDirectory(),module.getDestinationPath());
      }
 else {
        moduleOutputDir=new File(project.getBuild().getDirectory());
      }
      List<String> loadExterns=new ArrayList<String>();
      loadExterns.add(getLinkReport());
      if (getLoadExterns() != null) {
        loadExterns.addAll(Arrays.asList(getLoadExterns()));
      }
      MxmlcMojo cfg=this.clone();
      cfg.classifier=classifier;
      cfg.targetDirectory=moduleOutputDir;
      cfg.finalName=moduleFinalName;
      if (module.isOptimize()) {
        cfg.getCache().put("String_Node_Str",loadExterns.toArray(new String[1]));
      }
      results.add(executeCompiler(new MxmlcConfigurationHolder(cfg,moduleSource),fullSynchronization));
    }
    wait(results);
  }
}