org.apache.catalina.loader.WebappClassLoader Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.catalina.loader;
import org.apache.catalina.LifecycleException;
public class WebappClassLoader extends WebappClassLoaderBase {
public WebappClassLoader() {
super();
}
public WebappClassLoader(ClassLoader parent) {
super(parent);
}
/**
* Returns a copy of this class loader without any class file
* transformers. This is a tool often used by Java Persistence API
* providers to inspect entity classes in the absence of any
* instrumentation, something that can't be guaranteed within the
* context of a {@link java.lang.instrument.ClassFileTransformer}'s
* {@link java.lang.instrument.ClassFileTransformer#transform(ClassLoader,
* String, Class, java.security.ProtectionDomain, byte[]) transform} method.
*
* The returned class loader's resource cache will have been cleared
* so that classes already instrumented will not be retained or
* returned.
*
* @return the transformer-free copy of this class loader.
*/
@Override
public WebappClassLoader copyWithoutTransformers() {
WebappClassLoader result = new WebappClassLoader(getParent());
super.copyStateWithoutTransformers(result);
try {
result.start();
} catch (LifecycleException e) {
throw new IllegalStateException(e);
}
return result;
}
/**
* This class loader is not parallel capable so lock on the class loader
* rather than a per-class lock.
*/
@Override
protected Object getClassLoadingLock(String className) {
return this;
}
}