Zarathuztra Zarathuztra - 6 months ago 27
Java Question

Play 2.4 Finder throws Null Pointer Exception

I'm currently having an issue with a Finder instance in Play 2.4 whereby it returns a null pointer exception when used. Here is the code trying to use it

public ExpressionList<ClientAuthorization> getAuthorizationQuery(String appId) {
return ClientAuthorization.find.where().eq("app_id", appId).eq("active", 1);
}


And the model class

package models;

import com.avaje.ebean.Model;

import javax.persistence.*;
import java.sql.Timestamp;


@Entity
@Table(name="client_authorization")
public class ClientAuthorization extends Model {

public static final Finder<Long, ClientAuthorization> find = new Finder<>(ClientAuthorization.class);


@Id
public long clientAuthorizationId;

@Column(nullable=false, length=45)
public String appId;

@Column(nullable=false, length=45)
public String apiKey;

@Column(nullable=false)
public boolean active;

@Column(nullable = false)
public boolean isAdmin;

@Column(nullable=false)
public Timestamp createdDate;

@Column(nullable=false)
public Timestamp updatedDate;

@PrePersist
protected void createdAt() {
this.createdDate = new Timestamp(System.currentTimeMillis());
this.updatedDate = new Timestamp(System.currentTimeMillis());
}

@PostPersist
protected void updatedAt() {
this.updatedDate = new Timestamp(System.currentTimeMillis());
}


}


This works fine for every model I've ever created in Play, so I'm not sure what's going on. Here is what I get

NPE

I greatly appreciate any help I can get. This is driving me crazy in an upgrade project I'm working on. The last upgrade I did went just fine, but this one is giving me problems.

Additional info: It fails on the call to where() just after the ClientAuthorization static call to find

update

Since it came up in a comment, this is not just a question of what a NPE is, I know that already. For some reason the finder is not initialized. However, looking at this model, and every model I've ever written, there is no reason for this to be happening.

Here is the stack trace

@6o9455j27 - Internal server error, for (GET) [/] ->

play.api.http.HttpErrorHandlerExceptions$$anon$1: Execution exception[[NullPointerException: null]]
at play.api.http.HttpErrorHandlerExceptions$.throwableToUsefulException(HttpErrorHandler.scala:265) ~[play_2.11-2.4.4.jar:2.4.4]
at play.api.http.DefaultHttpErrorHandler.onServerError(HttpErrorHandler.scala:191) ~[play_2.11-2.4.4.jar:2.4.4]
at play.api.GlobalSettings$class.onError(GlobalSettings.scala:179) [play_2.11-2.4.4.jar:2.4.4]
at play.api.DefaultGlobal$.onError(GlobalSettings.scala:212) [play_2.11-2.4.4.jar:2.4.4]
at play.api.http.GlobalSettingsHttpErrorHandler.onServerError(HttpErrorHandler.scala:94) [play_2.11-2.4.4.jar:2.4.4]
at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$9$$anonfun$apply$1.applyOrElse(PlayDefaultUpstreamHandler.scala:151) [play-netty-server_2.11-2.4.4.jar:2.4.4]
at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$9$$anonfun$apply$1.applyOrElse(PlayDefaultUpstreamHandler.scala:148) [play-netty-server_2.11-2.4.4.jar:2.4.4]
at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36) [scala-library-2.11.6.jar:na]
at scala.util.Failure$$anonfun$recover$1.apply(Try.scala:215) [scala-library-2.11.6.jar:na]
at scala.util.Try$.apply(Try.scala:191) [scala-library-2.11.6.jar:na]
at scala.util.Failure.recover(Try.scala:215) [scala-library-2.11.6.jar:na]
at scala.concurrent.Future$$anonfun$recover$1.apply(Future.scala:324) [scala-library-2.11.6.jar:na]
at scala.concurrent.Future$$anonfun$recover$1.apply(Future.scala:324) [scala-library-2.11.6.jar:na]
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32) [scala-library-2.11.6.jar:na]
at play.api.libs.iteratee.Execution$trampoline$.executeScheduled(Execution.scala:109) [play-iteratees_2.11-2.4.4.jar:2.4.4]
at play.api.libs.iteratee.Execution$trampoline$.execute(Execution.scala:71) [play-iteratees_2.11-2.4.4.jar:2.4.4]
at scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:40) [scala-library-2.11.6.jar:na]
at scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:248) [scala-library-2.11.6.jar:na]
at scala.concurrent.Promise$class.complete(Promise.scala:55) [scala-library-2.11.6.jar:na]
at scala.concurrent.impl.Promise$DefaultPromise.complete(Promise.scala:153) [scala-library-2.11.6.jar:na]
at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:23) [scala-library-2.11.6.jar:na]
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40) [akka-actor_2.11-2.3.13.jar:na]
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397) [akka-actor_2.11-2.3.13.jar:na]
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) [scala-library-2.11.6.jar:na]
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) [scala-library-2.11.6.jar:na]
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) [scala-library-2.11.6.jar:na]
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) [scala-library-2.11.6.jar:na]
Caused by: java.lang.NullPointerException: null
at com.avaje.ebean.Model$Find.query(Model.java:547) ~[avaje-ebeanorm-4.6.2.jar:na]
at com.avaje.ebean.Model$Find.where(Model.java:741) ~[avaje-ebeanorm-4.6.2.jar:na]
at repositories.AuthRepository.getAuthorizationQuery(AuthRepository.java:12) ~[classes/:na]
at interceptors.AuthInterceptor.call(AuthInterceptor.java:31) ~[classes/:na]
at play.core.j.JavaAction$$anonfun$7.apply(JavaAction.scala:94) ~[play_2.11-2.4.4.jar:2.4.4]
at play.core.j.JavaAction$$anonfun$7.apply(JavaAction.scala:94) ~[play_2.11-2.4.4.jar:2.4.4]
at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24) [scala-library-2.11.6.jar:na]
at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24) [scala-library-2.11.6.jar:na]
at play.core.j.HttpExecutionContext$$anon$2.run(HttpExecutionContext.scala:40) ~[play_2.11-2.4.4.jar:2.4.4]
at play.api.libs.iteratee.Execution$trampoline$.execute(Execution.scala:70) [play-iteratees_2.11-2.4.4.jar:2.4.4]
at play.core.j.HttpExecutionContext.execute(HttpExecutionContext.scala:32) ~[play_2.11-2.4.4.jar:2.4.4]
at scala.concurrent.impl.Future$.apply(Future.scala:31) ~[scala-library-2.11.6.jar:na]
at scala.concurrent.Future$.apply(Future.scala:492) ~[scala-library-2.11.6.jar:na]
at play.core.j.JavaAction.apply(JavaAction.scala:94) ~[play_2.11-2.4.4.jar:2.4.4]
at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4$$anonfun$apply$5.apply(Action.scala:105) ~[play_2.11-2.4.4.jar:2.4.4]
at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4$$anonfun$apply$5.apply(Action.scala:105) ~[play_2.11-2.4.4.jar:2.4.4]
at play.utils.Threads$.withContextClassLoader(Threads.scala:21) ~[play_2.11-2.4.4.jar:2.4.4]
at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4.apply(Action.scala:104) ~[play_2.11-2.4.4.jar:2.4.4]
at play.api.mvc.Action$$anonfun$apply$1$$anonfun$apply$4.apply(Action.scala:103) ~[play_2.11-2.4.4.jar:2.4.4]
at scala.Option.map(Option.scala:146) ~[scala-library-2.11.6.jar:na]
at play.api.mvc.Action$$anonfun$apply$1.apply(Action.scala:103) ~[play_2.11-2.4.4.jar:2.4.4]
at play.api.mvc.Action$$anonfun$apply$1.apply(Action.scala:96) ~[play_2.11-2.4.4.jar:2.4.4]
at play.api.libs.iteratee.Iteratee$$anonfun$mapM$1.apply(Iteratee.scala:524) ~[play-iteratees_2.11-2.4.4.jar:2.4.4]
at play.api.libs.iteratee.Iteratee$$anonfun$mapM$1.apply(Iteratee.scala:524) ~[play-iteratees_2.11-2.4.4.jar:2.4.4]
at play.api.libs.iteratee.Iteratee$$anonfun$flatMapM$1.apply(Iteratee.scala:560) ~[play-iteratees_2.11-2.4.4.jar:2.4.4]
at play.api.libs.iteratee.Iteratee$$anonfun$flatMapM$1.apply(Iteratee.scala:560) ~[play-iteratees_2.11-2.4.4.jar:2.4.4]
at play.api.libs.iteratee.Iteratee$$anonfun$flatMap$1$$anonfun$apply$13.apply(Iteratee.scala:536) ~[play-iteratees_2.11-2.4.4.jar:2.4.4]
at play.api.libs.iteratee.Iteratee$$anonfun$flatMap$1$$anonfun$apply$13.apply(Iteratee.scala:536) ~[play-iteratees_2.11-2.4.4.jar:2.4.4]
at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24) [scala-library-2.11.6.jar:na]
at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24) [scala-library-2.11.6.jar:na]
... 6 common frames omitted

Answer

In case somebody runs into a similar problem, the config should be double-checked. The default Model superclass does not care of it. Details about aplication.conf and orm.xml can be found here:

EBean config

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