Error Getting Data from Federated Catalog

[shadowwma]

Hi all,

I'm new to Eclipse Dataspace Connector and I'm trying to enable postgresql support to MVD.
I have successfully add sql support to control-plane and Identity Hub, but when I add dataplane-selector-instance-store-sql and from Dashboard call federatedcatalog I get error 500 and get the following error:

SEVERE 2024-03-26T18:42:00.583533 JerseyExtension: Unexpected exception caught
java.lang.NullPointerException: Cannot invoke "java.util.List.stream()" because the return value of "org.eclipse.edc.catalog.spi.Dataset.getDistributions()" is null
        at org.eclipse.edc.core.transform.transformer.from.JsonObjectFromDatasetTransformer.transform(JsonObjectFromDatasetTransformer.java:58)
        at org.eclipse.edc.core.transform.transformer.from.JsonObjectFromDatasetTransformer.transform(JsonObjectFromDatasetTransformer.java:38)
        at org.eclipse.edc.core.transform.TransformerContextImpl.transform(TransformerContextImpl.java:60)
        at org.eclipse.edc.core.transform.transformer.from.JsonObjectFromCatalogTransformer.lambda$transform$0(JsonObjectFromCatalogTransformer.java:53)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
        at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:693)
        at org.eclipse.edc.core.transform.transformer.from.JsonObjectFromCatalogTransformer.transform(JsonObjectFromCatalogTransformer.java:54)
        at org.eclipse.edc.core.transform.transformer.from.JsonObjectFromCatalogTransformer.transform(JsonObjectFromCatalogTransformer.java:36)
        at org.eclipse.edc.core.transform.TransformerContextImpl.transform(TransformerContextImpl.java:60)
        at org.eclipse.edc.core.transform.TypeTransformerRegistryImpl.transform(TypeTransformerRegistryImpl.java:55)
        at org.eclipse.edc.catalog.api.query.FederatedCatalogApiController.lambda$getCachedCatalog$0(FederatedCatalogApiController.java:59)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
        at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
        at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
        at org.eclipse.edc.catalog.api.query.FederatedCatalogApiController.getCachedCatalog(FederatedCatalogApiController.java:62)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:52)
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:146)
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:189)
        at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:219)
        at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:93)
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:478)
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:400)
        at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:81)
        at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:261)
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248)
        at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:292)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:274)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:244)
        at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265)
        at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:240)
        at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:697)
        at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:394)
        at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:346)
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:357)
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:311)
        at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:205)
        at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:764)
        at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:529)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221)
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1381)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176)
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:484)
        at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174)
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1303)
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129)
        at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:192)
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122)
        at org.eclipse.jetty.server.Server.handle(Server.java:563)
        at org.eclipse.jetty.server.HttpChannel$RequestDispatchable.dispatch(HttpChannel.java:1598)
        at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:753)
        at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:501)
        at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:282)
        at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:314)
        at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100)
        at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:421)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:390)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:277)
        at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:199)
        at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:411)
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:969)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1194)
        at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1149)
        at java.base/java.lang.Thread.run(Thread.java:833)

I have created Dataplane using the post message from MVD.postman_collection included in the MVD.
Thank you in advance.

[shadowwma]

Thank you for your immediate response. The problem was from incorrect configuration. I corrected it and it is working now.

…

On Tue, Mar 26, 2024 at 9:05 PM Tayllana Wislla Da Costa Amador < ***@***.***> wrote: The error you're encountering seems to be related to a NullPointerException in your Java code. From the stack trace, it appears that the issue is happening in the JsonObjectFromDatasetTransformer class at line 58. Specifically, it seems that the getDistributions() method is returning null, causing a NullPointerException when you attempt to invoke stream() on it. Here are a few steps you can take to troubleshoot and resolve this issue: 1. *Check Dataset Retrieval*: Ensure that the dataset you're trying to transform actually contains distributions. If the dataset doesn't have any distributions, then getDistributions() might return null, leading to the NullPointerException. 2. *Null Checking*: Add a null check before invoking the stream() method to avoid the NullPointerException. You can do this by checking if getDistributions() returns null and handle this case accordingly. 3. *Debugging*: Use debugging tools provided by your IDE (Integrated Development Environment) to step through the code and see the state of variables leading up to the error. This can help you identify where exactly the null value is coming from and why it's occurring. 4. *Review Configuration*: Double-check your configuration settings, especially related to the Data Plane and any configurations related to the PostgreSQL support. Ensure that all necessary configurations are properly set up and that there are no discrepancies. 5. *Consult Documentation*: Refer to the documentation for Eclipse Dataspace Connector, particularly regarding the integration of PostgreSQL support and any specific requirements or configurations needed for the Data Plane and MVD. You may find additional insights or troubleshooting steps in the documentation. 6. *Community or Support Channels*: If you're still unable to resolve the issue, consider reaching out to the Eclipse Dataspace Connector community forums or support channels for assistance. Other users or the development team may have encountered similar issues and can provide guidance or solutions. By following these steps and carefully investigating the cause of the NullPointerException, you should be able to diagnose and resolve the error in your Eclipse Dataspace Connector configuration. — Reply to this email directly, view it on GitHub <#248 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AUQFB26UZ4MYEQOESDAEJSTY2HBI3AVCNFSM6AAAAABFJKQJAKVHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM4DSMJZGQ3DC> . You are receiving this because you authored the thread.Message ID: <eclipse-edc/MinimumViableDataspace/repo-discussions/248/comments/8919461@ github.com>