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From "Patrick Linskey (JIRA)" <j...@apache.org>
Subject [jira] Closed: (OPENJPA-14) PCEnhancer ant task requires openjpa jars to be on the system classpath or passed into ant with '-lib'
Date Fri, 25 Aug 2006 07:40:22 GMT
     [ http://issues.apache.org/jira/browse/OPENJPA-14?page=all ]

Patrick Linskey closed OPENJPA-14.
----------------------------------

    Assignee: Patrick Linskey  (was: Bryan Noll)

Use the class's classloader in environments when service lookups should be looking in the
OpenJPA distribution. This imposes the restriction that OpenJPA will only find services in
the same classloader as the OpenJPA jars themselves, which is a much better restriction than
requiring that the classes be in the thread's context classloader.


> 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: Patrick Linskey
>         Attachments: OPENJPA-14.patch1, OPENJPA-14.patch2, OPENJPA-14.patch3, OPENJPA-14.patch4
>
>
> 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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