myeclipse Debug时出现JDI thread evaluations (Tiem of error : ) Reason:check the details

贴一下代码：MyHelper类代码

public class MyHelper extends SQLiteOpenHelper {

 public static final String DB_NAME = "product.db";
 public static final int VERSION = 11;
 public static String TB_NAME = "product";
 public static final String TB_NAME_COLLECTION = "collection";
 public static final String ID = "_id";
 public static final String DMCODE = "dmcode";
 public static final String PRODUCT_ID = "productid";
 public static final String NAME = "name";
 public static final String DESCRIPTION = "description";
 public static final String PRICE = "price";
 public static final String AMOUNT = "amount";
 public static final String TELEPHONE = "telephone";
 public static final String COLORNAME = "colorname";
 public static final String COLORID = "colorid";
 public static final String SIZENAME = "sizename";
 public static final String SIZEID = "sizeid";
 public static final String MODIFYDATE = "modifyDate";

 public MyHelper(Context context, String name, CursorFactory factory, int version) {
  super(context, name, factory, version);
 }
 public MyHelper(Context context, String name, CursorFactory factory, int version,String tableName) {
  super(context, name, factory, version);
  this.TB_NAME=tableName;
 }

 @Override
 public void onCreate(SQLiteDatabase db) {
  db.execSQL("CREATE TABLE IF NOT EXISTS " + TB_NAME + " (" + ID + " INTEGER PRIMARY KEY,"
    + DMCODE + " VARCHAR," + PRODUCT_ID + " VARCHAR," + NAME + " VARCHAR," + DESCRIPTION +
    " VARCHAR," + PRICE + " VARCHAR," + AMOUNT + " VARCHAR," + TELEPHONE + " VARCHAR," + COLORNAME + " VARCHAR," + COLORID
    + " VARCHAR," + SIZENAME + " VARCHAR," + SIZEID + " VARCHAR,"+ MODIFYDATE +" varchar");

 }

 @Override
 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

  db.execSQL("DROP TABLE IF EXISTS " + TB_NAME);
  onCreate(db);
 }

}

抛出该异常代码：

MyHelper helper = null;
   SQLiteDatabase db = null;
   Cursor cursor = null;
   try {
    helper = new MyHelper(this, MyHelper.DB_NAME, null, MyHelper.VERSION,MyHelper.TB_NAME_COLLECTION);
    db = helper.getWritableDatabase(); 
    String sql = "select * from " + MyHelper.TB_NAME_COLLECTION
    + " where productid=?";
    cursor = db.rawQuery(sql, new String[] {id});//调试至改行抛出异常
   } catch (Exception e) {
    Log.e(TAG, " " + e.getMessage());
    e.printStackTrace();
   } finally {
    if(cursor != null)
     cursor.close();
    if(db != null)
     db.close();
    if(helper != null)
     helper.close();
   } 

求高手解决啊，本人是新手，分也不多，还望大家多多解答。。