liferay finder方法总是返回null

Question

我的实体：

<entity name="Role" local-service="true" remote-service="false">
    <column name="id" type="long" primary="true" />
    <column name="system_id" type="int" />
    <column name="user_id" type="int" />
    <column name="comment" type="String" />
    <column name="status_id" type="int" />
    <column name="create_date" type="Date" />
    <column name="update_date" type="Date" />
    <column name="systemrequest_id" type="int" />
    <order by="asc">
            <order-column name="id" />
    </order>
    <finder name="bySystem" return-type="Collection">
        <finder-column name="system_id"/>
    </finder>
    <finder name="byUser" return-type="Collection">
        <finder-column name="user_id" />
        <finder-column name="status_id" />
    </finder>
    <finder name="byId" return-type="gad">
        <finder-column name="id" />
    </finder>
</entity>

然后我将方法findBybyUser()从RoleUtil.java复制到RoleLocalServiceImpl.java，如：

public java.util.List<com.example.model.gad> findBybyUser(
    int user_id, int status_id) throws com.liferay.portal.kernel.exception.SystemException {
    return RoleUtil.findBybyUser(user_id, status_id);
}

我已使用mvn liferay:build-service

部署了该服务

最后，我想在我的portlet中的doView方法中使用此finder方法：

@Override
public void doView(RenderRequest renderRequest, RenderResponse renderResponse) throws IOException, PortletException {
    List<PersonRoleHelper> personRoleList = new ArrayList<PersonRoleHelper>();
    try {
        List<User> userList = UserLocalServiceUtil.getUsers(1, UserLocalServiceUtil.getUsersCount());
        for (User user : userList){
            List<Role> roleList = RoleLocalServiceUtil.findBybyUser((int)user.getUserId(), 2);
            logger.info ("list size: "+roleList.size());
        }
        personRoleList.add(roleList);
        renderRequest.setAttribute("roles", personRoleList);
    } catch (SystemException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    super.doView(renderRequest, renderResponse);
}

在日志中，我始终看到list size: 0。我错过了什么？我应该如何访问finder方法才能获得结果？在SQL中使用where user_id= 1 and status_id =2返回结果

运行查询