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DataNucleus Core provides the primary components of a heterogenous Java persistence solution. It supports persistence API's being layered on top of the core functionality.

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/**********************************************************************
Copyright (c) 2007 Andy Jefferson and others. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Contributors:
    ...
**********************************************************************/
package org.datanucleus.transaction.jta;

import org.datanucleus.ClassLoaderResolver;
import org.datanucleus.NucleusContext;
import org.datanucleus.util.NucleusLogger;

/**
 * Locator for the TransactionManager for JOnAS.
 */
public class JOnASTransactionManagerLocator extends FactoryBasedTransactionManagerLocator
{
    Class factoryClass = null;

    /**
     * Constructor.
     * @param nucleusCtx the context this locator operates in
     */
    public JOnASTransactionManagerLocator(NucleusContext nucleusCtx)
    {
        super();
    }

    /**
     * Accessor for the factory class to use for this locator.
     * @param clr ClassLoader resolver
     * @return The class
     */
    protected Class getFactoryClass(ClassLoaderResolver clr)
    {
        if (factoryClass != null)
        {
            return factoryClass;
        }

        // Set the factoryClass since it will be used by the superclass
        try
        {
            try
            {
                factoryClass = clr.classForName("org.objectweb.jonas_tm.Current");
            }
            catch (Exception e)
            {
            }
        }
        catch (Exception e)
        {
            if (NucleusLogger.TRANSACTION.isDebugEnabled())
            {
                NucleusLogger.TRANSACTION.debug("Exception finding JOnAS transaction manager. " +
                    "Probably not in a JOnAS environment " + e.getMessage());
            }
        }
        return factoryClass;
    }
}