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Date: Thu, 17 Aug 2006 15:41:14 -0700 (PDT)
From: "Bryan Noll (JIRA)" <jira@apache.org>
To: open-jpa-dev@incubator.apache.org
Subject: [jira] Commented: (OPENJPA-14) PCEnhancer ant task requires openjpa
 jars to be on the system classpath or passed into ant with '-lib'
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    [ http://issues.apache.org/jira/browse/OPENJPA-14?page=comments#action_12428817 ] 
            
Bryan Noll commented on OPENJPA-14:
-----------------------------------

I thought about making it optional, but it just seemed odd to me that you'd have to have 'META-INF/persistence.xml' in one of the places I mentioned earlier...

1) system classpath
2)$ANT_HOME/lib
3) ant -lib dir_where_META_INF_is
4) I forgot about this before... but a 4th would be ${user.home}/.ant/lib

...in particular, the first two options seem like a round peg in a square hole.  Making it optional would be easy, but I just thought making it required would save users the problem of having to get that on their classpath.

Maybe I'm not seeing the use case?  Like I said though, changing it to optional is trivial.

> PCEnhancer ant task requires openjpa jars to be on the system classpath or passed into ant with '-lib'
> ------------------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-14
>                 URL: http://issues.apache.org/jira/browse/OPENJPA-14
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: lib
>         Environment: Windows XP
>            Reporter: Bryan Noll
>         Assigned To: Bryan Noll
>         Attachments: OPENJPA-14.patch1, OPENJPA-14.patch2
>
>
> Ideally, one should be able to run 'ant openjpac'  (openjpac would be a target defined in the build script that would use the PCEnhancer task) without having to put the openjpa jars on the system classpath or having to pass them into ant vie the '-lib' argument.  Currently this is not possible.  The root of the issue can be seen from by looking at the public static String[] getImplementors(String serviceName, ClassLoader loader) method of the Services class. Basically, the call to 
> loader = Thread.currentThread().getContextClassLoader();
> returns a ClassLoader with the $ANT_HOME\lib\*.jar and $JAVA_HOME\lib\tools.jar in it... which obviously doesn't contain 'META-INF/services/org.apache.openjpa.conf.ProductDerivation'
> The exception seen when encountering this issue:
> java.lang.ExceptionInInitializerError
>         at org.apache.openjpa.conf.OpenJPAConfigurationImpl.<init>(OpenJPAConfigurationImpl.java:510)
>         at org.apache.openjpa.conf.OpenJPAConfigurationImpl.<init>(OpenJPAConfigurationImpl.java:160)
>         at org.apache.openjpa.conf.OpenJPAConfigurationImpl.<init>(OpenJPAConfigurationImpl.java:151)
>         at org.apache.openjpa.ant.PCEnhancerTask.newConfiguration(PCEnhancerTask.java:77)
>         at org.apache.openjpa.lib.ant.AbstractTask.execute(AbstractTask.java:170)
>         at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
>         at org.apache.tools.ant.Task.perform(Task.java:364)
>         at org.apache.tools.ant.Target.execute(Target.java:341)
>         at org.apache.tools.ant.Target.performTasks(Target.java:369)
>         at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1216)
>         at org.apache.tools.ant.Project.executeTarget(Project.java:1185)
>         at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:40)
>         at org.apache.tools.ant.Project.executeTargets(Project.java:1068)
>         at org.apache.tools.ant.Main.runBuild(Main.java:668)
>         at org.apache.tools.ant.Main.startAnt(Main.java:187)
>         at org.apache.tools.ant.launch.Launcher.run(Launcher.java:251)
>         at org.apache.tools.ant.launch.Launcher.main(Launcher.java:72)
> Caused by: java.util.MissingResourceException: Your system is missing product derivations.  Product derivations provide configuration options for supported data stores and specifications.  You must have a META-INF/services/org.apache.openjpa.conf.ProductDerivation file in your classpath listing the available derivation classes, and some listed class must be instantiable.  Typically this file is bundled as part of the distribution.  Have you unbundled it, or unbundled its listed classes?
>         at org.apache.openjpa.conf.ProductDerivations.<clinit>(ProductDerivations.java:53)
>         ... 17 more

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