/*
* 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.startup;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLClassLoader;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.junit.Assert;
import org.junit.Test;
import org.apache.catalina.Context;
import org.apache.catalina.loader.WebappClassLoaderBase;
import org.apache.tomcat.util.buf.ByteChunk;
public class TestTomcatClassLoader extends TomcatBaseTest {
@Test
public void testDefaultClassLoader() throws Exception {
Tomcat tomcat = getTomcatInstance();
// No file system docBase required
Context ctx = getProgrammaticRootContext();
Tomcat.addServlet(ctx, "ClassLoaderReport", new ClassLoaderReport(null));
ctx.addServletMappingDecoded("/", "ClassLoaderReport");
tomcat.start();
ByteChunk res = getUrl("http://localhost:" + getPort() + "/");
Assert.assertEquals("WEBAPP,SYSTEM,OTHER,", res.toString());
}
@Test
public void testNonDefaultClassLoader() throws Exception {
Thread currentThread = Thread.currentThread();
ClassLoader cl = new URLClassLoader(new URL[0], currentThread.getContextClassLoader());
currentThread.setContextClassLoader(cl);
Tomcat tomcat = getTomcatInstance();
tomcat.getServer().setParentClassLoader(cl);
// No file system docBase required
Context ctx = getProgrammaticRootContext();
Tomcat.addServlet(ctx, "ClassLoaderReport", new ClassLoaderReport(cl));
ctx.addServletMappingDecoded("/", "ClassLoaderReport");
tomcat.start();
ByteChunk res = getUrl("http://localhost:" + getPort() + "/");
Assert.assertEquals("WEBAPP,CUSTOM,SYSTEM,OTHER,", res.toString());
}
private static final class ClassLoaderReport extends HttpServlet {
private static final long serialVersionUID = 1L;
private transient ClassLoader custom;
ClassLoaderReport(ClassLoader custom) {
this.custom = custom;
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
resp.setContentType("text/plain");
PrintWriter out = resp.getWriter();
ClassLoader system = ClassLoader.getSystemClassLoader();
ClassLoader cl = Thread.currentThread().getContextClassLoader();
while (cl != null) {
if (system == cl) {
out.print("SYSTEM,");
} else if (custom == cl) {
out.print("CUSTOM,");
} else if (cl instanceof WebappClassLoaderBase) {
out.print("WEBAPP,");
} else {
out.print("OTHER,");
}
cl = cl.getParent();
}
}
}
}