Program: 21239
Project: 21239
Buggy source:
public static DAG createDAG(Attributes attributes,int nlocals){
  Variables variables=new Variables(attributes);
  Variable classVar=variables.getVariableByName("String_Node_Str");
  List<Variable> localHiddenVars=new ArrayList<>();
  for (int i=0; i < nlocals; i++) {
    localHiddenVars.add(variables.newGaussianVariable("String_Node_Str" + i));
  }
  List<Variable> localMixtures=new ArrayList<>();
  if (addMixtures) {
    for (int i=0; i < attributes.getListOfNonSpecialAttributes().size() - 1; i++) {
      localMixtures.add(variables.newMultionomialVariable("String_Node_Str" + i,2));
    }
  }
  DAG dag=new DAG(variables);
  if (includeClassVar) {
    dag.getParentSets().stream().filter(w -> w.getMainVar() != classVar).filter(w -> !w.getMainVar().getName().startsWith("String_Node_Str")).filter(w -> !w.getMainVar().getName().startsWith("String_Node_Str")).forEach(w -> w.addParent(classVar));
  }
  for (  Variable localHiddenVar : localHiddenVars) {
    dag.getParentSets().stream().filter(w -> w.getMainVar() != classVar).filter(w -> !w.getMainVar().getName().startsWith("String_Node_Str")).filter(w -> !w.getMainVar().getName().startsWith("String_Node_Str")).forEach(w -> w.addParent(localHiddenVar));
  }
  if (addMixtures) {
    int index=0;
    for (    Variable predictedVariable : variables.getVariablesForListOfAttributes(attributes.getListOfNonSpecialAttributes())) {
      dag.getParentSet(predictedVariable).addParent(localMixtures.get(index));
      index++;
    }
  }
  if (linkHidden) {
    for (int i=0; i < localHiddenVars.size() - 1; i++) {
      for (int j=i + 1; j < localHiddenVars.size(); j++) {
        dag.getParentSet(localHiddenVars.get(i)).addParent(localHiddenVars.get(j));
      }
    }
  }
  System.out.println(dag.toString());
  return dag;
}

Fixed version (ground truth):
public static DAG createDAG(Attributes attributes,int nlocals){
  Variables variables=new Variables(attributes);
  Variable classVar=variables.getVariableByName("String_Node_Str");
  List<Variable> localHiddenVars=new ArrayList<>();
  for (int i=0; i < nlocals; i++) {
    localHiddenVars.add(variables.newGaussianVariable("String_Node_Str" + i));
  }
  List<Variable> localMixtures=new ArrayList<>();
  if (addMixtures) {
    for (int i=0; i < attributes.getListOfNonSpecialAttributes().size() - 1; i++) {
      localMixtures.add(variables.newMultionomialVariable("String_Node_Str" + i,2));
    }
  }
  DAG dag=new DAG(variables);
  if (includeClassVar) {
    dag.getParentSets().stream().filter(w -> w.getMainVar() != classVar).filter(w -> !w.getMainVar().getName().startsWith("String_Node_Str")).filter(w -> !w.getMainVar().getName().startsWith("String_Node_Str")).forEach(w -> w.addParent(classVar));
  }
  for (  Variable localHiddenVar : localHiddenVars) {
    dag.getParentSets().stream().filter(w -> w.getMainVar() != classVar).filter(w -> !w.getMainVar().getName().startsWith("String_Node_Str")).filter(w -> !w.getMainVar().getName().startsWith("String_Node_Str")).forEach(w -> w.addParent(localHiddenVar));
  }
  if (addMixtures) {
    int index=0;
    for (    Variable predictedVariable : variables.getVariablesForListOfAttributes(attributes.getListOfNonSpecialAttributes())) {
      if (predictedVariable != classVar) {
        dag.getParentSet(predictedVariable).addParent(localMixtures.get(index));
        index++;
      }
    }
  }
  if (linkHidden) {
    for (int i=0; i < localHiddenVars.size() - 1; i++) {
      for (int j=i + 1; j < localHiddenVars.size(); j++) {
        dag.getParentSet(localHiddenVars.get(i)).addParent(localHiddenVars.get(j));
      }
    }
  }
  System.out.println(dag.toString());
  return dag;
}