Program: 12250
Project: 12250
Buggy source:
public List<String> getSubclassNames(){
  List<String> subclassNames=new ArrayList<String>();
  for (  Expression expression : staticFieldMap.keySet()) {
    SimpleName simpleName=staticFieldMap.get(expression);
    String staticFieldName=simpleName.getIdentifier();
    Type castingType=isFirstStatementACastingVariableDeclaration(typeCheckMap.get(expression));
    if (!staticFieldName.contains("String_Node_Str")) {
      String subclassName=staticFieldName.substring(0,1).toUpperCase() + staticFieldName.substring(1,staticFieldName.length()).toLowerCase();
      if (existingInheritanceTree != null && castingType != null) {
        DefaultMutableTreeNode root=existingInheritanceTree.getRootNode();
        Enumeration<DefaultMutableTreeNode> enumeration=root.children();
        boolean found=false;
        while (enumeration.hasMoreElements()) {
          DefaultMutableTreeNode child=enumeration.nextElement();
          String childClassName=(String)child.getUserObject();
          if (castingType.resolveBinding().getQualifiedName().equals(childClassName)) {
            subclassNames.add(childClassName);
            found=true;
            break;
          }
        }
        if (!found)         subclassNames.add(null);
      }
 else {
        subclassNames.add(subclassName);
      }
    }
 else {
      String finalName="String_Node_Str";
      StringTokenizer tokenizer=new StringTokenizer(staticFieldName,"String_Node_Str");
      while (tokenizer.hasMoreTokens()) {
        String tempName=tokenizer.nextToken().toLowerCase().toString();
        finalName+=tempName.subSequence(0,1).toString().toUpperCase() + tempName.subSequence(1,tempName.length()).toString();
      }
      if (existingInheritanceTree != null && castingType != null) {
        DefaultMutableTreeNode root=existingInheritanceTree.getRootNode();
        Enumeration<DefaultMutableTreeNode> enumeration=root.children();
        boolean found=false;
        while (enumeration.hasMoreElements()) {
          DefaultMutableTreeNode child=enumeration.nextElement();
          String childClassName=(String)child.getUserObject();
          if (castingType.resolveBinding().getQualifiedName().equals(childClassName)) {
            subclassNames.add(childClassName);
            found=true;
            break;
          }
        }
        if (!found)         subclassNames.add(null);
      }
 else {
        subclassNames.add(finalName);
      }
    }
  }
  return subclassNames;
}

Fixed version (ground truth):
public List<String> getSubclassNames(){
  List<String> subclassNames=new ArrayList<String>();
  for (  Expression expression : staticFieldMap.keySet()) {
    SimpleName simpleName=staticFieldMap.get(expression);
    String staticFieldName=simpleName.getIdentifier();
    Type castingType=isFirstStatementACastingVariableDeclaration(typeCheckMap.get(expression));
    String subclassName=null;
    if (!staticFieldName.contains("String_Node_Str")) {
      subclassName=staticFieldName.substring(0,1).toUpperCase() + staticFieldName.substring(1,staticFieldName.length()).toLowerCase();
    }
 else {
      subclassName="String_Node_Str";
      StringTokenizer tokenizer=new StringTokenizer(staticFieldName,"String_Node_Str");
      while (tokenizer.hasMoreTokens()) {
        String tempName=tokenizer.nextToken().toLowerCase().toString();
        subclassName+=tempName.subSequence(0,1).toString().toUpperCase() + tempName.subSequence(1,tempName.length()).toString();
      }
    }
    if (existingInheritanceTree != null) {
      DefaultMutableTreeNode root=existingInheritanceTree.getRootNode();
      Enumeration<DefaultMutableTreeNode> enumeration=root.children();
      boolean found=false;
      while (enumeration.hasMoreElements()) {
        DefaultMutableTreeNode child=enumeration.nextElement();
        String childClassName=(String)child.getUserObject();
        if (childClassName.endsWith(subclassName)) {
          subclassNames.add(childClassName);
          found=true;
          break;
        }
 else         if (castingType != null && castingType.resolveBinding().getQualifiedName().equals(childClassName)) {
          subclassNames.add(childClassName);
          found=true;
          break;
        }
      }
      if (!found)       subclassNames.add(null);
    }
 else {
      subclassNames.add(subclassName);
    }
  }
  return subclassNames;
}