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org/apache/log4j/Category
ava.lang.NoClassDefFoundError: org/apache/log4j/Category	at com.solarmetric.log.Log4JLogFactory.newLogAdapter(Log4JLogFactory.java:19)	at com.solarmetric.log.LogFactoryAdapter.getLog(LogFactoryAdapter.java:25)	at com.solarmetric.conf.ConfigurationImpl.getLog(ConfigurationImpl.java:115)	at kodo.enhance.JDOEnhancer.run(JDOEnhancer.java:2168)	at kodo.jdbc.integration.eclipse.EnhancerBuilder.build(EnhancerBuilder.java:40)	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:564)	at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:615)	at org.eclipse.core.runtime.Platform.run(Platform.java:747)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:157)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:249)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:202)	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:229)	at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:615)	at org.eclipse.core.runtime.Platform.run(Platform.java:747)	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:232)	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:268)	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:297)	at org.eclipse.core.internal.resources.Workspace.build(Workspace.java:198)	at org.eclipse.ui.actions.GlobalBuildAction$1.run(GlobalBuildAction.java:182)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:66)