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 Here's the pertinent part of the stack trace if that helps: 
Caused by: org.gradle.api.InvalidUserDataException: There can be only one artifact per pom. Artifact jpa-api with file /home/steve/projects/hibernate/jpa-api/trunk/target/libs/jpa-api-2.0-testtesttest-javadoc.jar can't be assigned to pom default 
at org.gradle.api.internal.artifacts.publish.maven.deploy.DefaultArtifactPomContainer.throwExceptionIfMultipleArtifactsPerPom(DefaultArtifactPomContainer.java:62) 
at org.gradle.api.internal.artifacts.publish.maven.deploy.DefaultArtifactPomContainer.addArtifact(DefaultArtifactPomContainer.java:54) 
at org.gradle.api.internal.artifacts.publish.maven.deploy.AbstractMavenResolver.publish(AbstractMavenResolver.java:158) 
at org.apache.ivy.core.publish.PublishEngine.publish(PublishEngine.java:282) 
at org.apache.ivy.core.publish.PublishEngine.publish(PublishEngine.java:261) 
at org.gradle.api.internal.artifacts.ivyservice.DefaultIvyDependencyPublisher.publish(DefaultIvyDependencyPublisher.java:62) 
at org.gradle.api.internal.artifacts.ivyservice.DefaultIvyService.publish(DefaultIvyService.java:127) 
at org.gradle.api.internal.artifacts.ivyservice.ShortcircuitEmptyConfigsIvyService.publish(ShortcircuitEmptyConfigsIvyService.java:61) 
at org.gradle.api.internal.artifacts.ivyservice.ErrorHandlingIvyService.publish(ErrorHandlingIvyService.java:42) 
... 19 common frames omitted 
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