Program: 35041
Project: 35041
Buggy source:
@Test public void testBatchModel(){
  String area="String_Node_Str";
  dbService.createArea(area);
  BatchOperation batch=dbService.createWriteBatch(area);
  DBTestEntity entity=new DBTestEntity();
  entity.setType(11111);
  batch.putModel(bytes("String_Node_Str"),entity);
  entity=new DBTestEntity();
  entity.setType(22222);
  batch.putModel(bytes("String_Node_Str"),entity);
  entity=new DBTestEntity();
  entity.setType(33333);
  batch.putModel(bytes("String_Node_Str"),entity);
  entity=new DBTestEntity();
  entity.setType(44444);
  batch.putModel(bytes("String_Node_Str"),entity);
  entity=new DBTestEntity();
  entity.setType(55555);
  batch.putModel(bytes("String_Node_Str"),entity);
  batch.executeBatch();
  List<DBTestEntity> list=dbService.values(area,DBTestEntity.class);
  list.stream().forEach(dbTestEntity -> {
    System.out.println("String_Node_Str" + dbTestEntity.toString() + "String_Node_Str"+ dbTestEntity.getType()+ "String_Node_Str");
  }
);
  System.out.println();
  Assert.assertEquals(11111,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  Assert.assertEquals(22222,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  Assert.assertEquals(33333,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  Assert.assertEquals(44444,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  Assert.assertEquals(55555,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  batch.delete(bytes("String_Node_Str"));
  batch.delete(bytes("String_Node_Str"));
  batch.executeBatch();
  List<Entry<byte[],DBTestEntity>> entries=dbService.entryList(area,DBTestEntity.class);
  entries.stream().forEach(entry -> {
    System.out.println("String_Node_Str" + asString(entry.getKey()) + "String_Node_Str"+ entry.getValue().getType()+ "String_Node_Str");
  }
);
  System.out.println();
  Assert.assertEquals(11111,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  Assert.assertEquals(22222,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  Assert.assertEquals(33333,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  Assert.assertNotNull(dbService.get(area,bytes("String_Node_Str")));
  Assert.assertNull(dbService.get(area,bytes("String_Node_Str")));
  Assert.assertNull(dbService.get(area,bytes("String_Node_Str")));
  LevelDBManager.destroyArea(area);
}

Fixed version (ground truth):
@Test public void testBatchModel(){
  String area="String_Node_Str";
  dbService.createArea(area);
  BatchOperation batch=dbService.createWriteBatch(area);
  DBTestEntity entity=new DBTestEntity();
  entity.setType(11111);
  batch.putModel(bytes("String_Node_Str"),entity);
  entity=new DBTestEntity();
  entity.setType(22222);
  batch.putModel(bytes("String_Node_Str"),entity);
  entity=new DBTestEntity();
  entity.setType(33333);
  batch.putModel(bytes("String_Node_Str"),entity);
  entity=new DBTestEntity();
  entity.setType(44444);
  batch.putModel(bytes("String_Node_Str"),entity);
  entity=new DBTestEntity();
  entity.setType(55555);
  batch.putModel(bytes("String_Node_Str"),entity);
  batch.executeBatch();
  List<DBTestEntity> list=dbService.values(area,DBTestEntity.class);
  list.stream().forEach(dbTestEntity -> {
    System.out.println("String_Node_Str" + dbTestEntity.toString() + "String_Node_Str"+ dbTestEntity.getType()+ "String_Node_Str");
  }
);
  System.out.println();
  Assert.assertEquals(11111,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  Assert.assertEquals(22222,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  Assert.assertEquals(33333,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  Assert.assertEquals(44444,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  Assert.assertEquals(55555,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  batch=dbService.createWriteBatch(area);
  batch.delete(bytes("String_Node_Str"));
  batch.delete(bytes("String_Node_Str"));
  batch.executeBatch();
  List<Entry<byte[],DBTestEntity>> entries=dbService.entryList(area,DBTestEntity.class);
  entries.stream().forEach(entry -> {
    System.out.println("String_Node_Str" + asString(entry.getKey()) + "String_Node_Str"+ entry.getValue().getType()+ "String_Node_Str");
  }
);
  System.out.println();
  Assert.assertEquals(11111,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  Assert.assertEquals(22222,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  Assert.assertEquals(33333,dbService.getModel(area,bytes("String_Node_Str"),DBTestEntity.class).getType());
  Assert.assertNotNull(dbService.get(area,bytes("String_Node_Str")));
  Assert.assertNull(dbService.get(area,bytes("String_Node_Str")));
  Assert.assertNull(dbService.get(area,bytes("String_Node_Str")));
  LevelDBManager.destroyArea(area);
}