/*
* 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.core;
import java.io.File;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import org.apache.catalina.Wrapper;
import org.apache.catalina.startup.Tomcat;
import org.apache.catalina.startup.TomcatBaseTest;
import org.apache.jasper.servlet.JasperInitializer;
public class TestDefaultInstanceManager extends TomcatBaseTest {
@Test
public void testClassUnloading() throws Exception {
DefaultInstanceManager instanceManager = doClassUnloadingPrep();
// Request a JSP page (that doesn't load any tag libraries etc.)
// This page does use @PostConstruct to ensure that the cache does not
// retain strong references
getUrl("http://localhost:" + getPort() + "/test/annotations.jsp");
// Request a second JSP (again, no tag libraries etc.)
getUrl("http://localhost:" + getPort() + "/test/bug36923.jsp");
// Check the number of classes in the cache
int count = instanceManager.getAnnotationCacheSize();
// Request a third JSP (again, no tag libraries etc.)
getUrl("http://localhost:" + getPort() + "/test/bug5nnnn/bug51544.jsp");
// Force a GC to clear out unloaded class (first JSP)
System.gc();
// Spin a while until GC happens or we wait too long
int loop = 0;
while (loop < 10) {
if (instanceManager.getAnnotationCacheSize() == count) {
break;
}
Thread.sleep(100);
loop++;
}
// First JSP should be unloaded and replaced by third (second left
// alone) so no change in overall count
assertEquals(count, instanceManager.getAnnotationCacheSize());
}
private DefaultInstanceManager doClassUnloadingPrep() throws Exception {
Tomcat tomcat = getTomcatInstance();
// Create the context (don't use addWebapp as we want to modify the
// JSP Servlet settings).
File appDir = new File("test/webapp");
StandardContext ctxt = (StandardContext) tomcat.addContext(
null, "/test", appDir.getAbsolutePath());
ctxt.addServletContainerInitializer(new JasperInitializer(), null);
// Configure the defaults and then tweak the JSP servlet settings
// Note: Min value for maxLoadedJsps is 2
Tomcat.initWebappDefaults(ctxt);
Wrapper w = (Wrapper) ctxt.findChild("jsp");
w.addInitParameter("maxLoadedJsps", "2");
tomcat.start();
return (DefaultInstanceManager) ctxt.getInstanceManager();
}
}