Program: 64260
Project: 64260
Buggy source:
public void execute() throws BuildException {
  if (!destinationDirectory.isDirectory()) {
    throw new BuildException("String_Node_Str" + destinationDirectory.getPath() + "String_Node_Str");
  }
  if (!sourceDirectory.isDirectory()) {
    throw new BuildException("String_Node_Str" + sourceDirectory.getPath() + "String_Node_Str");
  }
  if (destinationPackage == null) {
    throw new BuildException("String_Node_Str",getLocation());
  }
  pathToPackage=this.destinationPackage.replace('.',File.separatorChar);
  DirectoryScanner ds=super.getDirectoryScanner(sourceDirectory);
  if (compileClasspath == null) {
    compileClasspath=new Path(getProject());
  }
  compileClasspath.append(Path.systemClasspath);
  String[] files=ds.getIncludedFiles();
  Java helperTask=(Java)getProject().createTask("String_Node_Str");
  helperTask.setFork(true);
  helperTask.setClassname("String_Node_Str");
  helperTask.setTaskName(getTaskName());
  String[] args=new String[12];
  File jspFile=null;
  String parents="String_Node_Str";
  String arg="String_Node_Str";
  int j=0;
  args[j++]="String_Node_Str";
  args[j++]=destinationDirectory.getAbsolutePath().trim();
  args[j++]="String_Node_Str";
  args[j++]=sourceDirectory.getAbsolutePath().trim();
  args[j++]="String_Node_Str";
  args[j++]="String_Node_Str";
  args[j++]="String_Node_Str";
  args[j++]="String_Node_Str";
  args[j++]=compileClasspath.toString();
  this.scanDir(files);
  log("String_Node_Str" + filesToDo.size() + "String_Node_Str");
  for (int i=0; i < filesToDo.size(); i++) {
    String filename=(String)filesToDo.elementAt(i);
    jspFile=new File(filename);
    args[j]="String_Node_Str";
    parents=jspFile.getParent();
    if ((parents != null) && (!("String_Node_Str").equals(parents))) {
      parents=this.replaceString(parents,File.separator,"String_Node_Str");
      args[j + 1]=destinationPackage + "String_Node_Str" + "String_Node_Str"+ parents;
    }
 else {
      args[j + 1]=destinationPackage;
    }
    args[j + 2]=sourceDirectory + File.separator + filename;
    helperTask.clearArgs();
    for (int x=0; x < j + 3; x++) {
      helperTask.createArg().setValue(args[x]);
    }
    helperTask.setClasspath(compileClasspath);
    if (helperTask.executeJava() != 0) {
      log(filename + "String_Node_Str",Project.MSG_WARN);
    }
  }
}

Fixed version (ground truth):
public void execute() throws BuildException {
  if (!destinationDirectory.isDirectory()) {
    throw new BuildException("String_Node_Str" + destinationDirectory.getPath() + "String_Node_Str");
  }
  if (!sourceDirectory.isDirectory()) {
    throw new BuildException("String_Node_Str" + sourceDirectory.getPath() + "String_Node_Str");
  }
  if (destinationPackage == null) {
    throw new BuildException("String_Node_Str",getLocation());
  }
  pathToPackage=this.destinationPackage.replace('.',File.separatorChar);
  DirectoryScanner ds=super.getDirectoryScanner(sourceDirectory);
  if (compileClasspath == null) {
    compileClasspath=new Path(getProject());
  }
  compileClasspath.append(Path.systemClasspath);
  String[] files=ds.getIncludedFiles();
  Java helperTask=(Java)getProject().createTask("String_Node_Str");
  helperTask.setFork(true);
  helperTask.setClassname("String_Node_Str");
  helperTask.setTaskName(getTaskName());
  String[] args=new String[12];
  File jspFile=null;
  String parents="String_Node_Str";
  int j=0;
  args[j++]="String_Node_Str";
  args[j++]=destinationDirectory.getAbsolutePath().trim();
  args[j++]="String_Node_Str";
  args[j++]=sourceDirectory.getAbsolutePath().trim();
  args[j++]="String_Node_Str";
  args[j++]="String_Node_Str";
  args[j++]="String_Node_Str";
  args[j++]="String_Node_Str";
  args[j++]=compileClasspath.toString();
  this.scanDir(files);
  log("String_Node_Str" + filesToDo.size() + "String_Node_Str");
  for (int i=0; i < filesToDo.size(); i++) {
    String filename=(String)filesToDo.elementAt(i);
    jspFile=new File(filename);
    args[j]="String_Node_Str";
    parents=jspFile.getParent();
    if ((parents != null) && (!("String_Node_Str").equals(parents))) {
      parents=this.replaceString(parents,File.separator,"String_Node_Str");
      args[j + 1]=destinationPackage + "String_Node_Str" + "String_Node_Str"+ parents;
    }
 else {
      args[j + 1]=destinationPackage;
    }
    args[j + 2]=sourceDirectory + File.separator + filename;
    helperTask.clearArgs();
    for (int x=0; x < j + 3; x++) {
      helperTask.createArg().setValue(args[x]);
    }
    helperTask.setClasspath(compileClasspath);
    if (helperTask.executeJava() != 0) {
      log(filename + "String_Node_Str",Project.MSG_WARN);
    }
  }
}