Examples of errors detected by the V6042 diagnostic

V6042. The expression is checked for compatibility with type 'A', but is cast to type 'B'.

Apache Hive

V6042 The expression is checked for compatibility with type 'A' but is cast to type 'B'. VectorColumnAssignFactory.java(347)

public static
VectorColumnAssign buildObjectAssign(VectorizedRowBatch outputBatch,
                                     int outColIndex,
                                     PrimitiveCategory category)
                                     throws HiveException
{
  VectorColumnAssign outVCA = null;
  ColumnVector destCol = outputBatch.cols[outColIndex];
  if (destCol == null) {
    ....
  }
  else if (destCol instanceof LongColumnVector)
  {
    switch(category) {
    ....
    case LONG:
      outVCA = new VectorLongColumnAssign() {
                   ....
                   } .init(.... , (LongColumnVector) destCol);
      break;
    case TIMESTAMP:
      outVCA = new VectorTimestampColumnAssign() {
                   ....
                   }.init(...., (TimestampColumnVector) destCol);       // <=
      break;
    case DATE:
      outVCA = new VectorLongColumnAssign() {
                   ....
                   } .init(...., (LongColumnVector) destCol);
      break;
    case INTERVAL_YEAR_MONTH:
      outVCA = new VectorLongColumnAssign() {
                    ....
                   }.init(...., (LongColumnVector) destCol);
      break;
    case INTERVAL_DAY_TIME:
      outVCA = new VectorIntervalDayTimeColumnAssign() {
                    ....
                    }.init(...., (IntervalDayTimeColumnVector) destCol);// <=
    break;
    default:
      throw new HiveException(....);
    }
  }
  else if (destCol instanceof DoubleColumnVector) {
    ....
  }
  ....
  else {
    throw new HiveException(....);
  }
  return outVCA;
}

XMage

V6042 The expression is checked for compatibility with type 'A' but is cast to type 'B'. CheckBoxList.java(586)

/**
 * sets the model - must be an instance of CheckBoxListModel
 *
 * @param model the model to use
 * @throws IllegalArgumentException if the model is not an instance of
 *           CheckBoxListModel
 * @see CheckBoxListModel
 */
@Override
public void setModel(ListModel model) {
  if (!(model instanceof CheckBoxListModel)) {
    if (model instanceof javax.swing.DefaultListModel) {
       super.setModel((CheckBoxListModel)model);         // <=
    }
    else {
      throw new IllegalArgumentException(
          "Model must be an instance of CheckBoxListModel!");
    }
  }
  else {
    super.setModel(model);
  }
}