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Subject: Re: ClassLoader vs GroovyClassLoader
From: Andrus Adamchik <andrus@objectstyle.org>
In-Reply-To: <AANLkTiktd2F+tQNh3binfH15Fo_b9UpHLFmkF+166aCt@mail.gmail.com>
Date: Thu, 4 Nov 2010 09:16:04 -0400
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References: <AANLkTinmoELg0H7gO-cNP1R_PR=RQseDvR1cck5qjXdN@mail.gmail.com>
 <AANLkTiktd2F+tQNh3binfH15Fo_b9UpHLFmkF+166aCt@mail.gmail.com>
To: user@cayenne.apache.org

Also be aware that most (all?) places in Cayenne 3.0.x were we load =
classes dynamically would use a thread ClassLoader if available:

Thread.currentThread().getContextClassLoader()

so you can force your ClassLoader via =
Thread.currentThread().setContextClassLoader(cl);

Cayenne 3.1 uses a similar approach, and additionally allows to register =
a custom service via DI.

Andrus

On Nov 3, 2010, at 3:57 PM, caden whitaker wrote:

> Think I got it, at least doing this gave me a ton of new errors that =
make
> sense ;) please let me know if you think I'm on the wrong track:
>=20
>           ClassLoader parent =3D getClass().getClassLoader();
>           GroovyClassLoader loader =3D new GroovyClassLoader(parent);
>           loader.parseClass(new
> =
File("C:\\tutorial\\src\\main\\java\\org\\example\\cayenne\\persistent\\St=
ore.groovy"));
>=20
>           ResourceLocator rl =3D new ResourceLocator();
>           rl.setClassLoader(loader);
>=20
>           Configuration c =3D new DefaultConfiguration("cayenne.xml", =
rl);
>           c.addDomain(new DataDomain("default"));
>=20
> On Wed, Nov 3, 2010 at 2:29 PM, caden whitaker =
<caden.whitaker@gmail.com>wrote:
>=20
>> Hey all, hope you aren't tired of me yet
>>=20
>> This in a nutshell is the problem:
>>           ClassLoader parent =3D getClass().getClassLoader();
>>           GroovyClassLoader loader =3D new GroovyClassLoader(parent);
>>           loader.parseClass(new
>> =
File("C:\\tutorial\\src\\main\\java\\org\\example\\cayenne\\persistent\\St=
ore.groovy"));
>>=20
>> loader.loadClass("main.java.org.example.cayenne.persistent.Store");
>>=20
>> =
System.out.println(Class.forName("main.java.org.example.cayenne.persistent=
.Store",
>> true, loader).toString());
>>=20
>>           DataDomain dd =3D
>> Configuration.getSharedConfiguration().getDomain();
>>           ObjectContext context =3D dd.createDataContext();
>>=20
>> Error:
>> java.lang.ClassNotFoundException: class
>> main.java.org.example.cayenne.persistent.Store
>>   at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
>>   at java.security.AccessController.doPrivileged(Native Method)
>>   at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>>   at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
>>   at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>>   at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
>>   at
>> =
main.java.org.example.cayenne.ut.CayenneUnitTest.testBuild(CayenneUnitTest=
.java:128)
>>=20
>> At this point the "Store" object (which is compiled at runtime =
through
>> Groovy) does not exist in any context that teh DataContext can find =
it, the
>> DataContext is looking for it in Class.forName, but that is looking =
in the
>> default ClassLoader. This "Store" object does not exist in that =
context, it
>> is in its own ClassLoader (GroovyClassLoader). So how do I tell the =
system
>> to load the object from this GroovyClassLoader?? I know this is the =
issue
>> because if I take that Store object, make it a Java class, compile =
it, and
>> run the same test it works fine.
>>=20
>>=20
>>=20