Return a new instance of the given class. Checks the ThreadContext classloader first, then uses the System classloader.
/*
* Copyright 2003-2008 The Apache Software Foundation.
*
* 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.
*
*/
import java.io.InputStream;
/**
*
* @author <a href="mailto:wglass@apache.org">Will Glass-Husain</a>
* @version $Id: ClassUtils.java 685685 2008-08-13 21:43:27Z nbubna $
* @since 1.5
*/
public class Main {
/**
* Return a new instance of the given class. Checks the ThreadContext
* classloader first, then uses the System classloader. Should replace all
* calls to <code>Class.forName( claz ).newInstance()</code> (which only
* calls the System class loader) when the class might be in a different
* classloader (e.g. in a webapp).
*
* @param clazz the name of the class to instantiate
* @return an instance of the specified class
* @throws ClassNotFoundException
* @throws IllegalAccessException
* @throws InstantiationException
*/
public static Object getNewInstance(String clazz)
throws ClassNotFoundException,IllegalAccessException,InstantiationException
{
return getClass(clazz).newInstance();
}
/**
* Return the specified class. Checks the ThreadContext classloader first,
* then uses the System classloader. Should replace all calls to
* <code>Class.forName( claz )</code> (which only calls the System class
* loader) when the class might be in a different classloader (e.g. in a
* webapp).
*
* @param clazz the name of the class to instantiate
* @return the requested Class object
* @throws ClassNotFoundException
*/
public static Class getClass(String clazz) throws ClassNotFoundException
{
/**
* Use the Thread context classloader if possible
*/
ClassLoader loader = Thread.currentThread().getContextClassLoader();
if (loader != null)
{
try
{
return Class.forName(clazz, true, loader);
}
catch (ClassNotFoundException E)
{
/**
* If not found with ThreadContext loader, fall thru to
* try System classloader below (works around bug in ant).
*/
}
}
/**
* Thread context classloader isn't working out, so use system loader.
*/
return Class.forName(clazz);
}
}
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