Program: 24461
Project: 24461
Buggy source:
public void buildWhere(StringBuilder where,List<QueryByFilterItem> items,Map<String,Object> params,String predicate,String alias,Map<String,Class<?>> froms,Map<String,List<QueryByFilterProjection>> projections,Map<String,List<QueryByFilterOrder>> orders){
  if (items == null)   return;
  Iterator<QueryByFilterItem> iter=items.iterator();
  char aliasAppend='A';
  while (iter.hasNext()) {
    QueryByFilterItem item=iter.next();
    if (item instanceof QueryByFilterItemGroup) {
      if (((QueryByFilterItemGroup)item).getItems() == null && ((QueryByFilterItemGroup)item).getItems().isEmpty())       continue;
      where.append("String_Node_Str");
      buildWhere(where,((QueryByFilterItemGroup)item).getItems(),params,((QueryByFilterItemGroup)item).getPredicate(),alias,froms,projections,orders);
      where.append("String_Node_Str");
    }
 else     if (item instanceof QueryByFilterItemPredicate) {
      QueryByFilterItemPredicate pred=((QueryByFilterItemPredicate)item);
      String fieldName=pred.getFieldName();
      where.append(alias).append("String_Node_Str").append(fieldName);
      if (pred.getFieldValue() == null) {
        if (QueryOperator.EQUALS.equals(pred.getFieldOperator())) {
          where.append("String_Node_Str");
        }
 else         if (QueryOperator.NOT_EQUALS.equals(pred.getFieldOperator())) {
          where.append("String_Node_Str");
        }
      }
 else {
        where.append(getJPQLOperator(pred.getFieldOperator()));
        String pName=fieldName.replace('.','_');
        int i=1;
        while (params.get(pName) != null)         pName=fieldName.replace('.','_') + (i++);
        if (QueryOperator.LIKE.equals(pred.getFieldOperator()) && ((pred.getFieldValue() instanceof String) || pred.getFieldValue() == null)) {
          String value=(String)pred.getFieldValue();
          if (value == null)           params.put(pName,"String_Node_Str");
 else {
            if (value.indexOf("String_Node_Str") != -1)             params.put(pName,value.toUpperCase().replaceAll("String_Node_Str","String_Node_Str"));
 else             params.put(pName,"String_Node_Str" + value.toUpperCase() + "String_Node_Str");
          }
        }
 else {
          params.put(pName,pred.getFieldValue());
        }
        where.append(':').append(pName);
      }
    }
 else     if (item instanceof QueryByFilterItemText) {
      where.append(alias).append("String_Node_Str").append(((QueryByFilterItemText)item).getCondition());
    }
 else     if (item instanceof QueryByFilterItemReverse) {
      String field=((QueryByFilterItemReverse)item).getField();
      String newAlias=alias + (aliasAppend++);
      QueryByFilter qbf=((QueryByFilterItemReverse)item).getQueryByFilter();
      where.append(newAlias).append("String_Node_Str").append(field);
      where.append(getJPQLOperator(((QueryByFilterItemReverse)item).getOperator()));
      String fieldReverse=((QueryByFilterItemReverse)item).getFieldReverse();
      if (fieldReverse == null || "String_Node_Str".equals(fieldReverse) || "String_Node_Str".equals(fieldReverse))       where.append(alias);
 else       where.append(alias).append('.').append(fieldReverse);
      froms.put(newAlias,qbf.getCandidateClass());
      if (!qbf.getProjections().isEmpty())       projections.put(newAlias,qbf.getProjections());
      if (!qbf.getOrders().isEmpty())       orders.put(newAlias,qbf.getOrders());
      if (qbf.getItems().size() > 0) {
        where.append("String_Node_Str").append(predicate).append("String_Node_Str");
      }
      buildWhere(where,qbf.getItems(),params,qbf.getPredicateOperator(),newAlias,froms,projections,orders);
    }
    if (iter.hasNext())     where.append("String_Node_Str").append(predicate).append("String_Node_Str");
  }
}

Fixed version (ground truth):
public void buildWhere(StringBuilder where,List<QueryByFilterItem> items,Map<String,Object> params,String predicate,String alias,Map<String,Class<?>> froms,Map<String,List<QueryByFilterProjection>> projections,Map<String,List<QueryByFilterOrder>> orders){
  if (items == null)   return;
  Iterator<QueryByFilterItem> iter=items.iterator();
  char aliasAppend='A';
  while (iter.hasNext()) {
    QueryByFilterItem item=iter.next();
    if (item instanceof QueryByFilterItemGroup) {
      if (((QueryByFilterItemGroup)item).getItems() == null && ((QueryByFilterItemGroup)item).getItems().isEmpty())       continue;
      where.append("String_Node_Str");
      buildWhere(where,((QueryByFilterItemGroup)item).getItems(),params,((QueryByFilterItemGroup)item).getPredicate(),alias,froms,projections,orders);
      where.append("String_Node_Str");
    }
 else     if (item instanceof QueryByFilterItemPredicate) {
      QueryByFilterItemPredicate pred=((QueryByFilterItemPredicate)item);
      String fieldName=pred.getFieldName();
      String pName=fieldName.replace('.','_');
      int i=1;
      while (params.get(pName) != null)       pName=fieldName.replace('.','_') + (i++);
      if (QueryOperator.LIKE.equals(pred.getFieldOperator()) && ((pred.getFieldValue() instanceof String) || pred.getFieldValue() == null)) {
        where.append("String_Node_Str").append(alias).append("String_Node_Str").append(fieldName).append("String_Node_Str");
      }
 else       if (pred.getFieldOperator().equals(QueryOperator.CONTAINS)) {
        where.append("String_Node_Str").append(pName);
      }
 else {
        where.append(alias).append("String_Node_Str").append(fieldName);
      }
      if (pred.getFieldValue() == null) {
        if (QueryOperator.EQUALS.equals(pred.getFieldOperator())) {
          where.append("String_Node_Str");
        }
 else         if (QueryOperator.NOT_EQUALS.equals(pred.getFieldOperator())) {
          where.append("String_Node_Str");
        }
      }
 else {
        where.append(getJPQLOperator(pred.getFieldOperator()));
        if (pred.getFieldOperator().equals(QueryOperator.IN) || pred.getFieldOperator().equals(QueryOperator.CONTAINS))         where.append("String_Node_Str");
        if (QueryOperator.LIKE.equals(pred.getFieldOperator()) && ((pred.getFieldValue() instanceof String) || pred.getFieldValue() == null)) {
          String value=(String)pred.getFieldValue();
          if (value == null)           params.put(pName,"String_Node_Str");
 else {
            if (value.indexOf("String_Node_Str") != -1)             params.put(pName,value.toUpperCase().replaceAll("String_Node_Str","String_Node_Str"));
 else             params.put(pName,"String_Node_Str" + value.toUpperCase() + "String_Node_Str");
          }
        }
 else {
          params.put(pName,pred.getFieldValue());
        }
        if (pred.getFieldOperator().equals(QueryOperator.CONTAINS))         where.append(alias).append("String_Node_Str").append(fieldName);
 else         where.append(':').append(pName);
        if (pred.getFieldOperator().equals(QueryOperator.IN) || pred.getFieldOperator().equals(QueryOperator.CONTAINS))         where.append("String_Node_Str");
      }
    }
 else     if (item instanceof QueryByFilterItemText) {
      where.append(alias).append("String_Node_Str").append(((QueryByFilterItemText)item).getCondition());
    }
 else     if (item instanceof QueryByFilterItemReverse) {
      String field=((QueryByFilterItemReverse)item).getField();
      String newAlias=alias + (aliasAppend++);
      QueryByFilter qbf=((QueryByFilterItemReverse)item).getQueryByFilter();
      where.append(newAlias).append("String_Node_Str").append(field);
      where.append(getJPQLOperator(((QueryByFilterItemReverse)item).getOperator()));
      String fieldReverse=((QueryByFilterItemReverse)item).getFieldReverse();
      if (fieldReverse == null || "String_Node_Str".equals(fieldReverse) || "String_Node_Str".equals(fieldReverse))       where.append(alias);
 else       where.append(alias).append('.').append(fieldReverse);
      froms.put(newAlias,qbf.getCandidateClass());
      if (!qbf.getProjections().isEmpty())       projections.put(newAlias,qbf.getProjections());
      if (!qbf.getOrders().isEmpty())       orders.put(newAlias,qbf.getOrders());
      if (qbf.getItems().size() > 0) {
        where.append("String_Node_Str").append(predicate).append("String_Node_Str");
      }
      buildWhere(where,qbf.getItems(),params,qbf.getPredicateOperator(),newAlias,froms,projections,orders);
    }
    if (iter.hasNext())     where.append("String_Node_Str").append(predicate).append("String_Node_Str");
  }
}