Adding EntityListener Throws Unexpected Internal Exception

@Entity
@EntityListeners(MyListener.class)
public class Product extends BaseModel<Product> {

    public Product() {
        super(Product.class);
    }

    @MapsId
    @ManyToOne(fetch = FetchType.LAZY)
    private SomeClass someClass;

    ... Setter/Getter, Map, Enum & other primitive fields..
}

public class MyListener {

    @PostLoad
    public void onPostLoad(Object o) {
        Logger.info("PostLoad call.");
    }

    @PreUpdate
    public void onPreRemove(Object o) {
        Logger.info("PreUpdate call.");
    }
}

[error] application - message= Unexpected internal exception, cause= [ObjectDB 2.5.4] Unexpected exception (Error 990)
  Generated by Java HotSpot(TM) 64-Bit Server VM 1.8.0 (on Linux 3.2.0-57-generic).
Please report this error on http://www.objectdb.com/database/issue/new
com.objectdb.o.InternalException: java.lang.NullPointerException: null
java.lang.NullPointerException
at com.objectdb.o.ANT.R(ANT.java:792)
at com.objectdb.o.ANT.Q(ANT.java:772)
at com.objectdb.o.JPA.b(JPA.java:150)
at com.objectdb.o.SCM.r(SCM.java:239)
at com.objectdb.o.TYS.n(TYS.java:294)
at com.objectdb.o.TYM.ae(TYM.java:521)
at com.objectdb.o.TYM.ac(TYM.java:467)
at com.objectdb.o.TYM.ao(TYM.java:788)
at com.objectdb.o.TYM.at(TYM.java:873)
at com.objectdb.o.TVS.g(TVS.java:93)
at com.objectdb.o.EMR.q(EMR.java:76)
at com.objectdb.jpa.EMImpl.merge(EMImpl.java:514)
at models.core.db.objectdb.ObjectDBBaseModel.update(ObjectDBBaseModel.java:75)
at data.DataDev.addDefaultProduct(DataDev.java:164)
at data.DataDev.lambda$insert$5(DataDev.java:136)
at data.DataDev$$Lambda$2/2130689326.invoke(Unknown Source)
at play.db.jpa.JPA$1.apply(JPA.java:106)
at play.db.jpa.JPA$1.apply(JPA.java:104)
at play.db.jpa.JPA.withTransaction(JPA.java:135)
at play.db.jpa.JPA.withTransaction(JPA.java:104)
at data.DataDev.insert(DataDev.java:113)
at Global.onStart(Global.java:154)
at play.core.j.JavaGlobalSettingsAdapter.onStart(JavaGlobalSettingsAdapter.scala:22)
at play.api.GlobalPlugin.onStart(GlobalSettings.scala:220)
at play.api.Play$$anonfun$start$1$$anonfun$apply$mcV$sp$1.apply(Play.scala:91)
at play.api.Play$$anonfun$start$1$$anonfun$apply$mcV$sp$1.apply(Play.scala:91)
at scala.collection.immutable.List.foreach(List.scala:383)
at play.api.Play$$anonfun$start$1.apply$mcV$sp(Play.scala:91)
at play.api.Play$$anonfun$start$1.apply(Play.scala:91)
at play.api.Play$$anonfun$start$1.apply(Play.scala:91)
at play.utils.Threads$.withContextClassLoader(Threads.scala:21)
at play.api.Play$.start(Play.scala:90)
at play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply(ApplicationProvider.scala:142)
at play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1$$anonfun$1.apply(ApplicationProvider.scala:115)
at scala.Option.map(Option.scala:145)
at play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1.apply(ApplicationProvider.scala:115)
at play.core.ReloadableApplication$$anonfun$get$1$$anonfun$apply$1.apply(ApplicationProvider.scala:113)
at scala.util.Success.flatMap(Try.scala:230)
at play.core.ReloadableApplication$$anonfun$get$1.apply(ApplicationProvider.scala:113)
at play.core.ReloadableApplication$$anonfun$get$1.apply(ApplicationProvider.scala:105)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
at scala.concurrent.forkjoin.ForkJoinTask$AdaptedRunnableAction.exec(ForkJoinTask.java:1361)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

    for (Class l = listenerClass; l != Object.class; l = l.getSuperclass()) {
        for (Method method : l.getDeclaredMethods()) { // <= Here is the NullPointerException
            ...
        }
    }