Catalina,
thank you kindly for your quick response.
When I put the class in the ''org.apache.openjpa.jdbc.meta.strats"
and then put it in the openjpa jar file, it works. If I leave it in my
application jar file, the class still doesn't load.
If I put the class with my package
"pl.com.agora.testcase.valuehandler" in the openjpa jar file it works.
Actually, when I put my value handler class in a jar and place it on
weblogic classpath (for example add the path to the file to
PRE_CLASSPATH variable in weblogic setEnv.cmd) it works fine.
So it seems the classloader used in the method described by you can't
load the application classes.
By the way, how do I open jira issue?
Best regards,
Mikolaj
2008/4/12 catalina wei <[EMAIL PROTECTED]>:
> Mikolaj,
> My suggestion is try placing your valueHandler under
> org.apche.openjpa.jdbc.meta.strats package, see if that would get your
> valueHandler class loaded OK.
> If that works, then open a jira issue for the problem, we need to fix
> CFMetaDataParser.classForName() to use application class loader to load
> user's valueHandler.
>
> Here is a possible fix to CFMetaDataParser.java:
> protected Class classForName(String name, boolean resolve)
> throws SAXException {
> if (name == null)
> return null;
> Class cls = classForName(name, _package, resolve,
> currentClassLoader());
> if (cls == null) {
> // 2nd attempt, use application class loader to load
> classForName(name, _package, resolve,
> (ClassLoader) AccessController.doPrivileged(
> J2DoPrivHelper.getContextClassLoaderAction()));
> if (cls == null)
> throw getException(_loc.get("invalid-class",
> name).getMessage());
> }
> return cls;
> }
>
> Catalina
>
>
>
> On 4/11/08, Mikołaj Gierulski <[EMAIL PROTECTED]> wrote:
> >
> > Hello,
> > I am trying to use a custom ValueHandler to map custom objects to columns.
> > I have implemented a class
> > pl.com.agora.testcase.valuehandler.ConfigurationOptionValueHandler
> > extends org.apache.openjpa.jdbc.meta.strats.AbstractValueHandler
> >
> > In my entities I use it as follows:
> > @Persistent
> > @Column(name = "OPTION")
> >
> >
> @Strategy("pl.com.agora.testcase.valuehandler.ConfigurationOptionValueHandler")
> > private ConfigurationOption option;
> >
> > The problem is, an org.apache.openjpa.persistence.ArgumentException is
> > thrown on the first attempt to access the entity, where the root of
> > the problem is:
> >
> > org.apache.openjpa.persistence.ArgumentException:
> > "pl.com.agora.testcase.entity.TestEntity.option" declared custom value
> > handler
> > "pl.com.agora.testcase.valuehandler.ConfigurationOptionValueHandler",
> > but this handler cannot be instantiated.
> > at
> >
> org.apache.openjpa.jdbc.meta.MappingRepository.namedHandler(MappingRepository.java:949)
> > at
> >
> org.apache.openjpa.jdbc.meta.MappingRepository.defaultStrategy(MappingRepository.java:712)
> > at
> >
> org.apache.openjpa.jdbc.meta.RuntimeStrategyInstaller.installStrategy(RuntimeStrategyInstaller.java:62)
> > at
> >
> org.apache.openjpa.jdbc.meta.FieldMapping.resolveMapping(FieldMapping.java:438)
> > at
> > org.apache.openjpa.jdbc.meta.FieldMapping.resolve(FieldMapping.java:403)
> > at
> >
> org.apache.openjpa.jdbc.meta.ClassMapping.resolveNonRelationMappings(ClassMapping.java:823)
> > at
> >
> org.apache.openjpa.jdbc.meta.MappingRepository.prepareMapping(MappingRepository.java:319)
> > at
> >
> org.apache.openjpa.meta.MetaDataRepository.preMapping(MetaDataRepository.java:605)
> > at
> >
> org.apache.openjpa.meta.MetaDataRepository.resolve(MetaDataRepository.java:492)
> > ... 83 more
> > Caused by: <1.0.0 fatal user error>
> > org.apache.openjpa.persistence.ArgumentException: The class name
> > "pl.com.agora.testcase.valuehandler.ConfigurationOptionValueHandler"
> > used in a metadata extension on field
> > "pl.com.agora.testcase.entity.TestEntity.option" is not valid.
> > at
> > org.apache.openjpa.meta.JavaTypes.classForName(JavaTypes.java:227)
> > at
> > org.apache.openjpa.meta.JavaTypes.classForName(JavaTypes.java:194)
> > at
> >
> org.apache.openjpa.jdbc.meta.MappingRepository.namedHandler(MappingRepository.java:939)
> > ... 91 more
> >
> > I did some debugging and found out, that the problem seems to be, that
> > the method
> > org.apache.openjpa.lib.meta.CFMetaDataParser.classForName(String name,
> > String pkg, boolean resolve, ClassLoader loader)
> > called by
> > org.apache.openjpa.meta.JavaTypes.classForName(String name,
> > ClassMetaData meta, Class dec, ValueMetaData vmd, ClassLoader loader)
> >
> > returns null instead of my ConfigurationOptionValueHandler class.
> >
> > If I call this method from within my application though, with
> > classloader set to null and other arguments the same, it works
> > properly and returns desired class.
> >
> > I am using bea weblogic 10.0.1 with openjpa 1.0.0
> > The ConfigurationOptionValueHandler class is located in the same jar
> > file, as the TestEntity class.
> > This jar file is located in a lib folder of a war installed as a
> > library on the server.
> > My application is also installed as a war and depends on that library.
> >
> > My guess is the value handler should be located somewhere else, but I
> > don't know where this should be.
> >
> > Any suggestions will be much appreciated.
> >
> > Best regards,
> > Mikolaj.
> >
>
