Terracotta Discussion Forums

I’m upgrading our initial 2.7.3 Terracotta implementation to Terracotta 3.0 and I tried starting our custom java server which uses Hibernate as a Terracotta DSO node in Eclipse using the latest Terracotta Eclipse plugin, but I receive an error in the SLF4J library when Hibernate libraries try to call a non-existent SLF4J trace() method. If I run our server as a normal Java Application I don’t receive this error.

I’ve received errors like this before and is usually caused by a maven dependency including an older version of SLF4J (see this issue org.slf4j.impl.Log4jLoggerAdapter - AbstractMethodError).

I’m not sure what the Terracotta Eclipse plugin is doing or how I can override the SLF4J version it seems to be using.

Here’s the error:
Code:

 2009-06-29 18:09:03,927 INFO - Terracotta 3.0.0-stable1, as of 20090318-110351 (Revision 12200 by cruise@su10mo5 from 3.0)
 2009-06-29 18:09:04,298 INFO - Configuration loaded from the file at 'C:\dev\trunk\webwars-trunk2\littlethings\tc-config.xml'.
 2009-06-29 18:09:04,504 INFO - Log file: 'C:\Users\ddaniels\terracotta\clients\logs\terracotta-client.log'.
 2009-06-29 18:09:06,770 INFO - Connection successfully established to server at xxxxxxxx
 Jun 29, 2009 6:09:07 PM com.webwars.gameplatform.util.XmlConfigurationUtil configure
 INFO: PERSISTENCE SYSTEM: /hibernate.properties
 Jun 29, 2009 6:09:11 PM com.webwars.gameplatform.database.PersistenceSystem init
 SEVERE: PERSISTENCE SYSTEM: hibernatePropertiesPath: /hibernate.properties
 Jun 29, 2009 6:09:11 PM org.hibernate.cfg.annotations.Version <clinit>
 INFO: Hibernate Annotations 3.4.0.GA
 Jun 29, 2009 6:09:11 PM org.hibernate.annotations.common.Version <clinit>
 INFO: Hibernate Commons Annotations 3.1.0.GA
 Jun 29, 2009 6:09:11 PM com.webwars.gameplatform.database.DBUtil getSessionFactory
 SEVERE: HibernateConfigPath: /hibernate.cfg.xml HibernateConfigURL:  URI:file:/C:/dev/trunk/webwars-trunk2/littlethings/target/classes/hibernate.cfg.xml
 Jun 29, 2009 6:09:11 PM org.hibernate.cfg.search.HibernateSearchEventListenerRegister enableHibernateSearch
 INFO: Unable to find org.hibernate.search.event.FullTextIndexEventListener on the classpath. Hibernate Search is not enabled.
 Jun 29, 2009 6:09:12 PM org.hibernate.cfg.AnnotationBinder bindClass
 INFO: Binding entity from annotated class: com.webwars.gameplatform.agent.AgentDecorator
 Jun 29, 2009 6:09:12 PM org.hibernate.cfg.annotations.EntityBinder bindTable
 INFO: Bind entity com.webwars.gameplatform.agent.AgentDecorator on table AgentDecorator
 Exception in thread "main" java.lang.AbstractMethodError: org.slf4j.impl.JDK14LoggerAdapter.trace(Ljava/lang/String;)V
 	at org.hibernate.cfg.annotations.PropertyBinder.make(PropertyBinder.java:184)
 	at org.hibernate.cfg.AnnotationBinder.bindId(AnnotationBinder.java:1911)
 	at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:1279)
 	at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:754)
 	at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:546)
 	at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:291)
 	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1292)
 	at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
 ...

slf4j-nop is included in $TC_HOME/lib purely as a way to silence Jetty when embedded in the Terracotta server. We clearly need to a better way to accomplish that goal. For now you could try removing slf4j-nop.

I tried removing the SL4J nop jar from the plugins folder in eclipse:
C:\eclipse\plugins\org.terracotta.dso_3.0.0.stable1_r12200_v20090318\lib

But I still get the same error, I then tried moving in the SL4J that I use in the normal java application: slf4j-jdk14-1.5.6.jar

Still same error, I'm not sure where it's picking up the incorrect SLF4J implementation.

I was able to kind of work around the problem by including the following 2 jars on my Eclipse bootclasspath in the DSO Application launch configuration.

C:\Users\ddaniels\.m2\repository\org\slf4j\slf4j-jdk14\1.5.6\slf4j-jdk14-1.5.6.jar
C:\Users\ddaniels\.m2\repository\org\slf4j\slf4j-api\1.5.6\slf4j-api-1.5.6.jar

Trouble is that's not very portable as it references my home directory, is there a better solution?

Good. I couldn't see how the slf4j-nop we include in the kit could possibly affect your client, since in the client Terracotta code is loaded in an isolated classloader.

Are you using Maven+Eclipse? If so:

http://opensource.atlassian.com/projects/hibernate/browse/ANN-754

If this is your case, then you can simply add the proper dependencies to your pom.