Add support to provide custom classloader for class instantiation from
configuration
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Key: JCR-561
URL: http://issues.apache.org/jira/browse/JCR-561
Project: Jackrabbit
Issue Type: Improvement
Components: config
Affects Versions: 0.9, 1.0, 1.0.1
Reporter: Felix Meschberger
Assigned To: Felix Meschberger
Fix For: 1.1
The configuration framework is based around a BaseConfig class, which provides
functionality to instantiate a class whose name is configured in the repository
configuration file. Examples of such classes are the FileSystem or the
PersistenceManager elements.
The current implementation of the BeanConfig.newInstance() method is to use the
"default classloader" to load configured classes. That is, the class loader of
the BeanConfig class is actually used. This is - generally - the class loader
which loads the repository. In certain environments, classes may be provided
from outside the core repository class loader. An example fo such an
environment is an OSGi setup where each bundle gets its own class laoder, which
is separate from all other class loaders except declared by configuration.
I propose to enhance the BeanConfig class as follows:
public class BeanConfig {
...
// Current default class loader, default is BeanConfig's class loader
private static ClassLoader defaultClassLoader =
BeanConfig.class.getClassLoader();
// Current instance class loader
private ClassLoader classLoader;
...
// Sets the default class loader for new BeanConfig instances
public static void setDefaultClassLoader(ClassLoader loader);
// Returns the default class loader for new BeanConfig instances
public static ClassLoader getClassLoader();
// Sets the class loader of this BeanConfig instance
public void setClassLoader(ClassLoader loader);
// Returns the class loader of this BeanConfig instance
public ClassLoader getClassLoader();
}
The BeanConfig.newInstance method would then use the following to use the class:
public Object newInstance() throws ConfigurationException {
Class clazz = Class.forName(getClassName(), true, getClassLoader());
...
}
This has also been discussed on the dev list:
http://mail-archives.apache.org/mod_mbox/jackrabbit-dev/200607.mbox/[EMAIL
PROTECTED]
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