1 /**
2 * Copyright 2003-2006 Greg Luck
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package net.sf.ehcache.util;
18
19 import net.sf.ehcache.CacheException;
20
21 /**
22 * Keeps all classloading in ehcache consistent.
23 *
24 * @author Greg Luck
25 * @version $Id: ClassLoaderUtil.java 52 2006-04-24 14:50:03Z gregluck $
26 */
27 public final class ClassLoaderUtil {
28
29 /**
30 * Utility class.
31 */
32 private ClassLoaderUtil() {
33
34 }
35
36 /**
37 * Gets the <code>ClassLoader</code> that all classes in ehcache, and extensions, should use for classloading.
38 * All ClassLoading in ehcache should use this one. This is the only thing that seems to work for all of the
39 * class loading situations found in the wild.
40 * @return the thread context class loader.
41 */
42 public static ClassLoader getStandardClassLoader() {
43 return Thread.currentThread().getContextClassLoader();
44 }
45
46 /**
47 * Creates a new class instance. Logs errors along the way. Classes are loaded using the
48 * ehcache standard classloader.
49 *
50 * @param className a fully qualified class name
51 * @return null if the instance cannot be loaded
52 */
53 public static Object createNewInstance(String className) throws CacheException {
54 Class clazz;
55 Object newInstance;
56 try {
57 clazz = Class.forName(className, true, getStandardClassLoader());
58 newInstance = clazz.newInstance();
59 } catch (ClassNotFoundException e) {
60 throw new CacheException("Unable to load class " + className + ". Initial cause was " + e.getMessage(), e);
61 } catch (IllegalAccessException e) {
62 throw new CacheException("Unable to load class " + className + ". Initial cause was " + e.getMessage(), e);
63 } catch (InstantiationException e) {
64 throw new CacheException("Unable to load class " + className + ". Initial cause was " + e.getMessage(), e);
65 }
66 return newInstance;
67 }
68
69
70 }