Program: 81636
Project: 81636
Buggy source:
/** 
 * Returns the subtypes of a given base type as parameterized by wildcards.
 */
private List<JClassType> getPossiblyInstantiableSubtypes(TreeLogger logger,JClassType baseType,ProblemReport problems){
  assert(baseType == getBaseType(baseType));
  List<JClassType> possiblyInstantiableTypes=new ArrayList<JClassType>();
  if (baseType == typeOracle.getJavaLangObject()) {
    return possiblyInstantiableTypes;
  }
  List<JClassType> candidates=new ArrayList<JClassType>();
  candidates.add(baseType);
  List<JClassType> subtypes=Arrays.asList(baseType.getSubtypes());
  candidates.addAll(subtypes);
  for (  JClassType subtype : candidates) {
    JClassType subtypeBase=getBaseType(subtype);
    if (maybeInstantiable(logger,subtypeBase,problems)) {
      JGenericType isGeneric=subtype.isGenericType();
      if (isGeneric != null) {
        subtype=isGeneric.asParameterizedByWildcards();
      }
 else {
        assert(subtype instanceof JRealClassType);
      }
      possiblyInstantiableTypes.add(subtype);
    }
  }
  if (possiblyInstantiableTypes.size() == 0) {
    String possibilities[]=new String[candidates.size()];
    for (int i=0; i < possibilities.length; i++) {
      JClassType subtype=candidates.get(i);
      String worstMessage=problems.getWorstMessageForType(subtype);
      if (worstMessage == null) {
        possibilities[i]="String_Node_Str" + subtype.getParameterizedQualifiedSourceName() + "String_Node_Str";
      }
 else {
        possibilities[i]="String_Node_Str" + worstMessage;
      }
    }
    problems.add(baseType,baseType.getParameterizedQualifiedSourceName() + "String_Node_Str",Priority.DEFAULT,possibilities);
  }
  return possiblyInstantiableTypes;
}

Fixed version (ground truth):
/** 
 * Returns the subtypes of a given base type as parameterized by wildcards.
 */
private List<JClassType> getPossiblyInstantiableSubtypes(TreeLogger logger,JRealClassType baseType,ProblemReport problems){
  assert(baseType == getBaseType(baseType));
  List<JClassType> possiblyInstantiableTypes=new ArrayList<JClassType>();
  if (baseType == typeOracle.getJavaLangObject()) {
    return possiblyInstantiableTypes;
  }
  List<JClassType> candidates=new ArrayList<JClassType>();
  candidates.add(baseType);
  List<JClassType> subtypes=Arrays.asList(baseType.getSubtypes());
  candidates.addAll(subtypes);
  for (  JClassType subtype : candidates) {
    JClassType subtypeBase=getBaseType(subtype);
    if (maybeInstantiable(logger,subtypeBase,problems)) {
      JGenericType isGeneric=subtype.isGenericType();
      if (isGeneric != null) {
        subtype=isGeneric.asParameterizedByWildcards();
      }
 else {
        assert(subtype instanceof JRealClassType);
      }
      possiblyInstantiableTypes.add(subtype);
    }
  }
  if (possiblyInstantiableTypes.size() == 0) {
    String possibilities[]=new String[candidates.size()];
    for (int i=0; i < possibilities.length; i++) {
      JClassType subtype=candidates.get(i);
      String worstMessage=problems.getWorstMessageForType(subtype);
      if (worstMessage == null) {
        possibilities[i]="String_Node_Str" + subtype.getParameterizedQualifiedSourceName() + "String_Node_Str";
      }
 else {
        possibilities[i]="String_Node_Str" + worstMessage;
      }
    }
    problems.add(baseType,baseType.getParameterizedQualifiedSourceName() + "String_Node_Str",Priority.DEFAULT,possibilities);
  }
  return possiblyInstantiableTypes;
}