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From cverdes <cver...@gmail.com>
Subject Re: Error loading agent with Openjpa2
Date Thu, 04 Jun 2009 14:19:32 GMT

I forgot the maven config:

...
<plugins>
			<plugin>
				<artifactId>maven-antrun-plugin</artifactId>
				<executions>
					<execution>
						<phase>process-classes</phase>
						<configuration>
							<tasks>
								<java classname="org.apache.openjpa.enhance.PCEnhancer"
classpathref="maven.runtime.classpath" dir="target/classes" fork="true" />
							</tasks>
						</configuration>
						<goals>
							<goal>run</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
...

Rick Curtis wrote:
> 
> cverdes-
> 
> Please go ahead and open up a JIRA for the NPE. This is a new code that
> was added a late last week. I'm still looking into why
> ProtectionDomain.getCodeSource() can sometimes return null(The javadoc
> just states that it is possible, but doesn't give any reasons). In all of
> my testing it always worked correctly. What JVM are you running on? 
> 
> Also, the user manual [1] was updated for this support. Please let us know
> if any of this is unclear.
> 
> -Rick
> 
> [1]
> http://openjpa.apache.org/builds/latest/docs/manual/manual.html#ref_guide_pc_enhance_dynamic
> 
> 
> cverdes wrote:
>> 
>> Hi, Im running a DAO Test (with openjpa-kernel-2.0.0-EA2-SNAPSHOT) in
>> eclipse and with Maven, getting the next exception:
>> 
>> ...
>> Caused by: java.lang.NullPointerException
>> 	at
>> org.apache.openjpa.enhance.InstrumentationFactory.getAgentJar(InstrumentationFactory.java:204)
>> 	at
>> org.apache.openjpa.enhance.InstrumentationFactory.access$200(InstrumentationFactory.java:47)
>> 	at
>> org.apache.openjpa.enhance.InstrumentationFactory$1.run(InstrumentationFactory.java:99)
>> 	at java.security.AccessController.doPrivileged(Native Method)
>> 	at
>> org.apache.openjpa.enhance.InstrumentationFactory.getInstrumentation(InstrumentationFactory.java:87)
>> 	at
>> org.apache.openjpa.enhance.PCEnhancerAgent.loadDynamicAgent(PCEnhancerAgent.java:95)
>> 	at
>> org.apache.openjpa.persistence.PersistenceProviderImpl.loadAgent(PersistenceProviderImpl.java:243)
>> 	at
>> org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:91)
>> 	at
>> org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:119)
>> 	at
>> org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:55)
>> 	at javax.persistence.Persistence.createFactory(Persistence.java:172)
>> 	... 51 more
>> 
>> 1) I've downloaded the sources and fixed the problem not using the
>> dynamic enhance agent (openjpa.DynamicEnhancementAgent=false), but I
>> couldn't be able to find this parameter in the web, so my first question
>> is: Where can I find updated reference manual or similar documentation?.
>> 
>> 2) I've seen that this error is because
>> InstrumentationFactory.class.getProtectionDomain()== null
>>                 .getCodeSource().getLocation().
>> So, when it does getLocation().getFile() the NullPointerException is
>> throwed. I think this is a bug, and something like (if location!=null)
>> should be in the code.
>> Anyway, Do you know why could be  the code source location null? I would
>> like to test with dynamic enhance as well :p
>> 
>> Thanx a lot and I hope this thread will help in your work.
>> 
> 
> 

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