org.apache.cxf.common.logging.JDKBugHacks Maven / Gradle / Ivy
/**
* 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.cxf.common.logging;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Method;
import java.net.URL;
import java.net.URLConnection;
import java.security.AccessController;
import java.security.PrivilegedAction;
import javax.imageio.ImageIO;
import javax.xml.parsers.DocumentBuilderFactory;
import org.apache.cxf.common.classloader.ClassLoaderUtils;
import org.apache.cxf.common.classloader.ClassLoaderUtils.ClassLoaderHolder;
import org.apache.cxf.common.util.StringUtils;
/**
* This is called from LogUtils as LogUtils is almost always one of the VERY
* first classes loaded in CXF so we can try and register to hacks/workarounds
* for various bugs in the JDK.
*
* Much of this is taken from work the Tomcat folks have done to find
* places where memory leaks and jars are locked and such.
* See:
* http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/
* core/JreMemoryLeakPreventionListener.java
*
*/
final class JDKBugHacks {
private JDKBugHacks() {
//not constructed
}
private static boolean skipHack(final String key) {
String cname = null;
try {
cname = AccessController.doPrivileged(new PrivilegedAction() {
public String run() {
return System.getProperty(key);
}
});
if (StringUtils.isEmpty(cname)) {
InputStream ins = Thread.currentThread().getContextClassLoader()
.getResourceAsStream("META-INF/cxf/" + key);
if (ins == null) {
ins = ClassLoader.getSystemResourceAsStream("META-INF/cxf/" + key);
}
if (ins != null) {
BufferedReader din = new BufferedReader(new InputStreamReader(ins));
try {
cname = din.readLine();
if (cname != null) {
cname.trim();
}
} finally {
din.close();
}
}
}
} catch (Throwable t) {
//ignore
}
if (cname == null) {
cname = "false";
}
return Boolean.parseBoolean(cname);
}
public static void doHacks() {
if (skipHack("org.apache.cxf.JDKBugHacks.all")) {
return;
}
try {
// Use the system classloader as the victim for all this
// ClassLoader pinning we're about to do.
ClassLoaderHolder orig = ClassLoaderUtils
.setThreadContextClassloader(ClassLoader.getSystemClassLoader());
try {
try {
//Trigger a call to sun.awt.AppContext.getAppContext()
if (!skipHack("org.apache.cxf.JDKBugHacks.imageIO")) {
ImageIO.getCacheDirectory();
}
} catch (Throwable t) {
//ignore
}
try {
//DocumentBuilderFactory seems to SOMETIMES pin the classloader
if (!skipHack("org.apache.cxf.JDKBugHacks.documentBuilderFactory")) {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.newDocumentBuilder();
}
} catch (Throwable e) {
//ignore
}
// Several components end up calling:
// sun.misc.GC.requestLatency(long)
//
// Those libraries / components known to trigger memory leaks due to
// eventual calls to requestLatency(long) are:
// - javax.management.remote.rmi.RMIConnectorServer.start()
try {
if (!skipHack("org.apache.cxf.JDKBugHacks.gcRequestLatency")) {
Class clazz = Class.forName("sun.misc.GC");
Method method = clazz.getDeclaredMethod("currentLatencyTarget");
Long l = (Long)method.invoke(null);
if (l != null && l.longValue() == 0) {
//something already set it, move on
method = clazz.getDeclaredMethod("requestLatency",
new Class[] {Long.TYPE});
method.invoke(null, Long.valueOf(36000000));
}
}
} catch (Throwable e) {
//ignore
}
// Calling getPolicy retains a static reference to the context
// class loader.
try {
// Policy.getPolicy();
if (!skipHack("org.apache.cxf.JDKBugHacks.policy")) {
Class policyClass = Class
.forName("javax.security.auth.Policy");
Method method = policyClass.getMethod("getPolicy");
method.invoke(null);
}
} catch (Throwable e) {
// ignore
}
try {
// Initializing javax.security.auth.login.Configuration retains a static reference
// to the context class loader.
if (!skipHack("org.apache.cxf.JDKBugHacks.authConfiguration")) {
Class.forName("javax.security.auth.login.Configuration", true,
ClassLoader.getSystemClassLoader());
}
} catch (Throwable e) {
// Ignore
}
// Creating a MessageDigest during web application startup
// initializes the Java Cryptography Architecture. Under certain
// conditions this starts a Token poller thread with TCCL equal
// to the web application class loader.
if (!skipHack("org.apache.cxf.JDKBugHacks.securityProviders")) {
java.security.Security.getProviders();
}
try {
// Several components end up opening JarURLConnections without first
// disabling caching. This effectively locks the file.
// JAXB does this and thus affects us pretty badly.
// Doesn't matter that this JAR doesn't exist - just as long as
// the URL is well-formed
if (!skipHack("org.apache.cxf.JDKBugHacks.defaultUsesCaches")) {
URL url = new URL("jar:file://dummy.jar!/");
URLConnection uConn = new URLConnection(url) {
@Override
public void connect() throws IOException {
// NOOP
}
};
uConn.setDefaultUseCaches(false);
}
} catch (Throwable e) {
//ignore
}
} finally {
if (orig != null) {
orig.reset();
}
}
} catch (Throwable t) {
//ignore
}
}
}