ActAAAService's ClassCastException when using "id" as user key

When using "id" as user key, and id's Java type is Long.

The ActAAAService throw

java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.String

when try to call protected String username(USER_TYPE user) method.

User class:

@DB
@Entity
@Table(name = "u_user")
public class User implements SimpleBean, UserLinked {

    @Id
    @GeneratedValue(strategy=GenerationType.SEQUENCE)
    public Long id;

    @Column(name = "open_id", unique = true, nullable = false, updatable = false)
    public String openId;

    @Column(updatable = false)
    public String phone;

    ....
}

Log trace

2018-10-02 14:06:37.794 [XNIO-1 task-1] ERROR a.x.NetworkHandler - Error handling network request
java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.String
    at act.aaa.ActAAAService$Base.username(ActAAAService.java:220)
    at act.aaa.ActAAAService$Base.buildPrincipalFrom(ActAAAService.java:190)
    at act.aaa.ActAAAService$Base.principalOf(ActAAAService.java:169)
    at act.aaa.ActAAAService$Base.findByName(ActAAAService.java:112)
    at act.aaa.DefaultPersistentService.findByName(DefaultPersistentService.java:97)
    at act.aaa.AAAService.resolvePrincipal(AAAService.java:312)
    at act.aaa.AAAService.sessionResolved(AAAService.java:288)
    at act.aaa.AAAPlugin$1.on(AAAPlugin.java:65)
    at act.aaa.AAAPlugin$1.on(AAAPlugin.java:56)
    at act.event.EventBus.callOn(EventBus.java:1310)
    at act.event.EventBus.callOn(EventBus.java:1332)
    at act.event.EventBus.callOn(EventBus.java:1367)
    at act.event.EventBus._emitWithOnceBus(EventBus.java:1283)
    at act.event.EventBus.emit(EventBus.java:847)
    at act.app.ActionContext.resolve(ActionContext.java:1245)
    at act.route.Router$ContextualHandler.handle(Router.java:1596)
    at act.xio.NetworkHandler$3.run(NetworkHandler.java:158)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

actframework / act-aaa-plugin

ActAAAService's ClassCastException when using "id" as user key #31