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test/org/apache/catalina/startup/TestTomcatClassLoader.java

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+/*
+ * 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 javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.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 = tomcat.addContext("", null);
+
+        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 {
+
+        ClassLoader cl = new URLClassLoader(new URL[0],
+                Thread.currentThread().getContextClassLoader());
+
+        Thread.currentThread().setContextClassLoader(cl);
+
+        Tomcat tomcat = getTomcatInstance();
+        tomcat.getServer().setParentClassLoader(cl);
+
+        // No file system docBase required
+        Context ctx = tomcat.addContext("", null);
+
+        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;
+
+        public 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();
+            }
+        }
+    }
+}