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Bojan Antonovic
 Post subject: Hibernate + log4j2 + JPA + Maven: missing dependency
PostPosted: Wed Aug 30, 2017 6:12 am 
Newbie

Joined: Wed Aug 30, 2017 6:01 am
Posts: 2
In the case you receive

Code:
Exception in thread "main" org.hibernate.boot.registry.classloading.spi.ClassLoadingException: Unable to load class [org.apache.logging.log4j.core.appender.db.jpa.converter.ContextDataJsonAttributeConverter]
        at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:351)
        at org.hibernate.boot.model.process.internal.ScanningCoordinator.applyScanResultsToManagedResources(ScanningCoordinator.java:235)
        at org.hibernate.boot.model.process.internal.ScanningCoordinator.coordinateScan(ScanningCoordinator.java:81)
        at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.prepare(MetadataBuildingProcess.java:98)
        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.<init>(EntityManagerFactoryBuilderImpl.java:228)
        at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.<init>(EntityManagerFactoryBuilderImpl.java:170)
        at org.hibernate.jpa.boot.spi.Bootstrap.getEntityManagerFactoryBuilder(Bootstrap.java:76)
        at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilder(HibernatePersistenceProvider.java:181)
        at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:129)
        at org.hibernate.jpa.HibernatePersistenceProvider.getEntityManagerFactoryBuilderOrNull(HibernatePersistenceProvider.java:71)
        at org.hibernate.jpa.HibernatePersistenceProvider.createEntityManagerFactory(HibernatePersistenceProvider.java:52)
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55)
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:39)
        at com.boraji.tutorial.hibernate.MainApp.byJpa(MainApp.java:58)
        at com.boraji.tutorial.hibernate.MainApp.main(MainApp.java:24)
Caused by: java.lang.NoClassDefFoundError: com/fasterxml/jackson/databind/ObjectMapper
        at org.apache.logging.log4j.core.appender.db.jpa.converter.ContextDataJsonAttributeConverter.<clinit>(ContextDataJsonAttributeConverter.java:47)
        at java.base/java.lang.Class.forName0(Native Method)
        at java.base/java.lang.Class.forName(Unknown Source)
        at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:345)
        ... 14 more
Caused by: java.lang.ClassNotFoundException: com.fasterxml.jackson.databind.ObjectMapper
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
        at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
        ... 18 more


To fix it, modify your pom.xml.

Add

Code:
      <dependency>
         <groupId>com.fasterxml.jackson.core</groupId>
         <artifactId>jackson-databind</artifactId>
         <version>2.9.0</version>
         <scope>runtime</scope>
      </dependency>


around

Code:
      <dependency>
         <groupId>org.hibernate</groupId>
         <artifactId>hibernate-core</artifactId>
         <version>5.2.10.Final</version>
      </dependency>


Curiosly, it does not happen when you run your code in Eclipse!

For me, this is a bug in the Maven dependencies by Hibernate.
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vlad
 Post subject: Re: Hibernate + log4j2 + JPA + Maven: missing dependency
PostPosted: Wed Aug 30, 2017 7:06 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
Quote:
For me, this is a bug in the Maven dependencies by Hibernate.


Nope, it's not.

If you run mvn dependency:tree, you'll get something like this:

Code:
[INFO] --- maven-dependency-plugin:2.8:tree (default-cli) @ high-performance-java-persistence-core ---
[INFO] +- org.hibernate:hibernate-core:jar:5.2.11-SNAPSHOT:compile
[INFO] |  +- org.jboss.logging:jboss-logging:jar:3.3.0.Final:compile
[INFO] |  +- org.hibernate.javax.persistence:hibernate-jpa-2.1-api:jar:1.0.0.Final:compile
[INFO] |  +- org.javassist:javassist:jar:3.20.0-GA:compile
[INFO] |  +- antlr:antlr:jar:2.7.7:compile
[INFO] |  +- org.jboss.spec.javax.transaction:jboss-transaction-api_1.2_spec:jar:1.0.1.Final:compile
[INFO] |  +- org.jboss:jandex:jar:2.0.3.Final:compile
[INFO] |  +- com.fasterxml:classmate:jar:1.3.0:compile
[INFO] |  +- dom4j:dom4j:jar:1.6.1:compile
[INFO] |  |  \- xml-apis:xml-apis:jar:1.0.b2:compile
[INFO] |  \- org.hibernate.common:hibernate-commons-annotations:jar:5.0.1.Final:compile


So, as you can clearly see, there's no trace of jackson-databind dependency.

More, there's no occurrence for jackson-databind on GitHub as well.

The stack-trace is very accurate about the actual cause for your issue:

Code:
at org.apache.logging.log4j.core.appender.db.jpa.converter.ContextDataJsonAttributeConverter.<clinit>(ContextDataJsonAttributeConverter.java:47)


It's because of the Log4j ContextDataJsonAttributeConverter that you need jackson-databind.

Cheers!
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Bojan Antonovic
 Post subject: Re: Hibernate + log4j2 + JPA + Maven: missing dependency
PostPosted: Wed Aug 30, 2017 3:53 pm 
Newbie

Joined: Wed Aug 30, 2017 6:01 am
Posts: 2
You misunderstood me except in your last sentence: the dependency is missing!

I didnˋt do a more detailed analysis how to fix the problem eternaly. It's in the interplay between log4j, Hibernate and JPA in a very specific way.

Any maintainer is welcomed to supply a solution!
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vlad
 Post subject: Re: Hibernate + log4j2 + JPA + Maven: missing dependency
PostPosted: Wed Aug 30, 2017 3:57 pm 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
Quote:
Any maintainer is welcomed to supply a solution!


I guess you should ask the log4j maintainers to fix the missing dependency since ContextDataJsonAttributeConverter is their class, not ours.
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