java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/json/JsonMapper

[DmitriyLiakhovJava]

Hi, we had some problem. Our project have very low version of Jackson, and we can't upgrade it.

When we trying to create new 'EventDate' using 'EventDataBuilder' we have new exception, because in this builder hardcoded 'JsonMapper'.

Please, can you take out Jackson.

We have a suggestion to improve this problem:

https://github.com/EventStore/EventStoreDB-Client-Java/pull/215

Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/json/JsonMapper
    at com.eventstore.dbclient.EventDataBuilder.<clinit>(EventDataBuilder.java:12)
    at com.eventstore.dbclient.EventData.builderAsBinary(EventData.java:99)
    at com.eventstore.dbclient.EventData.builderAsBinary(EventData.java:88)

    at io.reactivex.rxjava3.internal.operators.mixed.ObservableConcatMapCompletable$ConcatMapCompletableObserver.drain(ObservableConcatMapCompletable.java:142)
    at io.reactivex.rxjava3.internal.operators.mixed.ConcatMapXMainObserver.onNext(ConcatMapXMainObserver.java:95)
    at io.reactivex.rxjava3.internal.operators.observable.ObservableDoOnEach$DoOnEachObserver.onNext(ObservableDoOnEach.java:101)
    at io.reactivex.rxjava3.internal.operators.observable.ObservableSubscribeOn$SubscribeOnObserver.onNext(ObservableSubscribeOn.java:58)
    at io.reactivex.rxjava3.internal.observers.DeferredScalarDisposable.complete(DeferredScalarDisposable.java:82)
    at io.reactivex.rxjava3.internal.operators.observable.ObservableFromCallable.subscribeActual(ObservableFromCallable.java:56)
    at io.reactivex.rxjava3.core.Observable.subscribe(Observable.java:13173)
    at io.reactivex.rxjava3.internal.operators.observable.ObservableSubscribeOn$SubscribeTask.run(ObservableSubscribeOn.java:96)
    at io.reactivex.rxjava3.internal.schedulers.ScheduledDirectTask.call(ScheduledDirectTask.java:38)
    ... 8 more
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.json.JsonMapper
    at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:419)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:352)
    ... 21 more```

[YoEight]

Hey @DmitriyLiakhovJava,

Could you share what JDK version you are using?

[DmitriyLiakhovJava]

We are using OpenJDK 1.8.202 and in our project we have 'com.fasterxml.jackson' - 2.8.7.

[YoEight]

I think it's reasonable to get rid of the JsonMapper in the EventDataBuilder type. It's actually something I had to do. There is another place where this could also happen and it's when you want to read a stream metadata, using getStreamMetadata method. Would you be using such method in a near future?

[DmitriyLiakhovJava]

Great! Won't be using in a near future 'getStreamMetadata'. 😊

[DmitriyLiakhovJava]

Сan i know when the fix will be published?

[YoEight]

I'll have the PR ready today, after that it depends on how fast it got reviewed.

[YoEight]

@DmitriyLiakhovJava I just cut release 4.1.1. It should be available on Maven Central in 3-6 hours.