org.hibernate.exception.ConstraintViolationException: could not execute statement

I have two table and they aren't any constraint but when run Unit test, it runs failed. This is my code:

Controller:

@play.db.jpa.Transactional
public static Result submit() throws NoSuchAlgorithmException {
    DynamicForm requestData = Form.form().bindFromRequest();
    String Id = session(Consts.SESSION_NAME);

    ATable aTable = new ATable();
    aTable.setId(Id);
    aTable.setAlert(requestData.get(Const.NAME));
    aTable.setCreatedAt(new Date());
    aTable.setCreatedBy(session(Consts.SESSION_NAME));
    aTable.setUpdatedAt(new Date());
    aTable.setUpdatedBy(session(Consts.SESSION_NAME));

    boolean resRequest = false;
    if (ADD.equals(requestData.get(Consts.TYPE))) {
        resRequest = service.insertATable(aTable);
        if (resRequest) {
            resRequest = service.insertBTable(requestData.get(Consts.ID),
                                requestData.get(Consts.MAIL), session(Consts.SESSION_NAME));
        }
    } else if (UPDATE.equals(requestData.get(Consts.TYPE))) {
        resRequest = service.updateATable(scoringRule);
        if (resRequest) {
            resRequest = service.updateBTable(
                            requestData.get(Consts.MAIL), requestData.get(Consts.ID));
        }
    }

    if (resRequest) {
        return ok("OK");
    } else {
        return badRequest("NG");
    }

}

In case REQUEST_TYPE is ADD: When run on browser, it runs OK. But Unit test can just run only one insert DB. When I remove insert ATable or BTable, it run OK.

And this is code for Unit test:

@Test
    public void testSubmit() {
        running(fakeApplication(), new Runnable() {
            @Override
            public void run() {
                Map<String, String> data = new HashMap<String, String>();
                data.put(Consts.ID, "id");
                data.put(Consts.TYPE, "add");
                data.put(Consts.MAIL, "a@a.com");
                Result result = route(fakeRequest(POST, "/abc/a")
                                .withSession(Consts.SESSION_NAME, "abc")
                                .withFormUrlEncodedBody(data));
                assertThat(status(result)).isEqualTo(OK);
                assertThat(contentType(result)).isEqualTo("text/html");
                assertThat(charset(result)).isEqualTo("utf-8");
            }
        });
    }

Please help me, thanks in advance.