Dropwizard throws NPE for a POST Request with @Valid over a list

[Sarath Prabath Redlapalli Jaya]

Dropwizard throws NPE and responds with 500 while accessing a POST resource. The resource method has validation over body

Resource Snippet:

public Response aPost(@Valid @NotEmpty List<Model> models) {

Stack Trace:

[2018-03-16 14:14:16,425] [] [WARN] MSG - o.e.j.s.HttpChannel /aPost

javax.servlet.ServletException: java.lang.NullPointerException

        at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:489)

        at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427)

        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388)

        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341)

        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228)

        at io.dropwizard.jetty.NonblockingServletHolder.handle(NonblockingServletHolder.java:49)

        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1650)

        at io.dropwizard.servlets.ThreadNameFilter.doFilter(ThreadNameFilter.java:34)

        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)

        at io.dropwizard.jersey.filter.AllowedMethodsFilter.handle(AllowedMethodsFilter.java:45)

        at io.dropwizard.jersey.filter.AllowedMethodsFilter.doFilter(AllowedMethodsFilter.java:39)

        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)

        at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:120)

        at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:135)

        at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1637)

        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:533)

        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)

        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1253)

        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)

        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:473)

        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)

        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1155)

        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)

        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)

        at com.codahale.metrics.jetty9.InstrumentedHandler.handle(InstrumentedHandler.java:241)

        at io.dropwizard.jetty.RoutingHandler.handle(RoutingHandler.java:52)

        at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:455)

        at io.dropwizard.jetty.BiDiGzipHandler.handle(BiDiGzipHandler.java:68)

        at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:56)

        at org.eclipse.jetty.server.handler.StatisticsHandler.handle(StatisticsHandler.java:169)

        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)

        at org.eclipse.jetty.server.Server.handle(Server.java:561)

        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:334)

        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)

        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)

        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:104)

        at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)

        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:679)

        at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:597)

        at java.lang.Thread.run(Thread.java:748)

Caused by: java.lang.NullPointerException: null

        at sun.reflect.annotation.TypeAnnotationParser.mapTypeAnnotations(TypeAnnotationParser.java:356)

        at sun.reflect.annotation.AnnotatedTypeFactory$AnnotatedTypeBaseImpl.<init>(AnnotatedTypeFactory.java:139)

        at sun.reflect.annotation.AnnotatedTypeFactory.buildAnnotatedType(AnnotatedTypeFactory.java:65)

        at sun.reflect.annotation.TypeAnnotationParser.buildAnnotatedType(TypeAnnotationParser.java:79)

        at java.lang.reflect.Field.getAnnotatedType(Field.java:1170)

        at org.hibernate.validator.internal.metadata.provider.TypeAnnotationAwareMetaDataProvider.findTypeAnnotationConstraintsForMember(TypeAnnotationAwareMetaDataProvider.java:65)

        at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.findPropertyMetaData(AnnotationMetaDataProvider.java:246)

        at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.getFieldMetaData(AnnotationMetaDataProvider.java:229)

        at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.retrieveBeanConfiguration(AnnotationMetaDataProvider.java:137)

        at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.getBeanConfiguration(AnnotationMetaDataProvider.java:125)

        at org.hibernate.validator.internal.metadata.provider.AnnotationMetaDataProvider.getBeanConfigurationForHierarchy(AnnotationMetaDataProvider.java:108)

        at org.hibernate.validator.internal.metadata.BeanMetaDataManager.createBeanMetaData(BeanMetaDataManager.java:203)

        at org.hibernate.validator.internal.metadata.BeanMetaDataManager.getOrCreateBeanMetaData(BeanMetaDataManager.java:231)

        at org.hibernate.validator.internal.metadata.BeanMetaDataManager.getBeanMetaData(BeanMetaDataManager.java:178)

        at org.hibernate.validator.internal.engine.ValidatorImpl.buildNewLocalExecutionContext(ValidatorImpl.java:770)

        at org.hibernate.validator.internal.engine.ValidatorImpl.validateCascadedConstraint(ValidatorImpl.java:753)

        at org.hibernate.validator.internal.engine.ValidatorImpl.validateCascadedConstraints(ValidatorImpl.java:680)

        at org.hibernate.validator.internal.engine.ValidatorImpl.validateParametersInContext(ValidatorImpl.java:1117)

        at org.hibernate.validator.internal.engine.ValidatorImpl.validateParameters(ValidatorImpl.java:301)

        at org.hibernate.validator.internal.engine.ValidatorImpl.validateParameters(ValidatorImpl.java:255)

        at io.dropwizard.jersey.validation.DropwizardConfiguredValidator.validateResourceAndInputParams(DropwizardConfiguredValidator.java:45)

        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:134)

        at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:160)

        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99)

        at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389)

        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347)

        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)

        at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326)

        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)

        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)

        at org.glassfish.jersey.internal.Errors.process(Errors.java:315)

        at org.glassfish.jersey.internal.Errors.process(Errors.java:297)

        at org.glassfish.jersey.internal.Errors.process(Errors.java:267)

        at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)

        at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305)

        at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154)

        at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473)

        ... 39 common frames omitted

The request is passing through, when @Valid annotation is absent

Thanks

[Jochen Schalanda]

Hi,

which version of Dropwizard are you using exactly?

Could you provide a minimal example which can be used to reproduce the issue?

Cheers,

Jochen

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[Sarath Prabath Redlapalli Jaya]

Hi Jochen,

Figured out the problem while building the sample class for you. Turned out i was using @NotEmpty from javax instead of hibernate-validator.

Thank you

Regards

Jochen

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