2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright (C) 2016 - 2017 AT&T
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ============LICENSE_END=========================================================
22 * Licensed to the Apache Software Foundation (ASF) under one or more
23 * contributor license agreements. See the NOTICE file distributed with
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25 * The ASF licenses this file to You under the Apache License, Version 2.0
26 * (the "License"); you may not use this file except in compliance with
27 * the License. You may obtain a copy of the License at
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37 package org.apache.tomcat.jdbc.pool;
40 import org.apache.juli.logging.Log;
41 import org.apache.juli.logging.LogFactory;
43 public class ClassLoaderUtil {
44 private static final Log log = LogFactory.getLog(ClassLoaderUtil.class);
46 private static final boolean onlyAttemptFirstLoader =
47 Boolean.parseBoolean(System.getProperty("org.apache.tomcat.jdbc.pool.onlyAttemptCurrentClassLoader", "false"));
49 public static Class<?> loadClass(String className, ClassLoader... classLoaders) throws ClassNotFoundException {
50 ClassNotFoundException last = null;
51 StringBuilder errorMsg = null;
52 for (ClassLoader cl : classLoaders) {
55 if (log.isDebugEnabled()) {
56 log.debug("Attempting to load class["+className+"] from "+cl);
58 return Class.forName(className, true, cl);
60 throw new ClassNotFoundException("Classloader is null");
62 } catch (ClassNotFoundException x) {
65 errorMsg = new StringBuilder();
69 errorMsg.append("ClassLoader:");
72 if (onlyAttemptFirstLoader) {
76 throw new ClassNotFoundException("Unable to load class: "+className+" from "+errorMsg, last);