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From dk...@apache.org
Subject svn commit: r897310 - in /cxf/trunk/common/common/src/main/java/org/apache/cxf/common/logging: JDKBugHacks.java Log4jLogger.java
Date Fri, 08 Jan 2010 19:46:41 GMT
Author: dkulp
Date: Fri Jan  8 19:46:40 2010
New Revision: 897310

URL: http://svn.apache.org/viewvc?rev=897310&view=rev
Log:
[CXF-1816] Copy some JDK hacks from Tomcat to try and get jars not to
lock.

Added:
    cxf/trunk/common/common/src/main/java/org/apache/cxf/common/logging/JDKBugHacks.java 
 (with props)
Modified:
    cxf/trunk/common/common/src/main/java/org/apache/cxf/common/logging/Log4jLogger.java

Added: cxf/trunk/common/common/src/main/java/org/apache/cxf/common/logging/JDKBugHacks.java
URL: http://svn.apache.org/viewvc/cxf/trunk/common/common/src/main/java/org/apache/cxf/common/logging/JDKBugHacks.java?rev=897310&view=auto
==============================================================================
--- cxf/trunk/common/common/src/main/java/org/apache/cxf/common/logging/JDKBugHacks.java (added)
+++ cxf/trunk/common/common/src/main/java/org/apache/cxf/common/logging/JDKBugHacks.java Fri
Jan  8 19:46:40 2010
@@ -0,0 +1,102 @@
+/**
+ * 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.lang.reflect.Method;
+import java.net.URL;
+import java.net.URLConnection;
+
+import javax.imageio.ImageIO;
+import javax.xml.parsers.DocumentBuilderFactory;
+
+/**
+ * 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
+    }
+    
+    public static void doHacks() {
+        ClassLoader orig = Thread.currentThread().getContextClassLoader();
+        try {
+            //set to the topmost non-null so things that grab the context classloader
+            //won't get our classloader.
+            ClassLoader ncl = orig;
+            while (ncl.getParent() != null) {
+                ncl = ncl.getParent();
+            }
+            Thread.currentThread().setContextClassLoader(ncl);
+            
+            try {
+                //Trigger a call to sun.awt.AppContext.getAppContext()
+                ImageIO.getCacheDirectory();
+            } catch (Throwable t) {
+                //ignore
+            }
+            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
+                URL url = new URL("jar:file://dummy.jar!/");
+                URLConnection uConn = url.openConnection();
+                uConn.setDefaultUseCaches(false);
+            } catch (Throwable e) {
+                //ignore
+            }
+            try {
+                //DocumentBuilderFactory seems to SOMETIMES pin the classloader
+                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 {
+                Class<?> clazz = Class.forName("sun.misc.GC");
+                Method method = clazz.getDeclaredMethod("requestLatency",
+                        new Class[] {Long.TYPE});
+                method.invoke(null, Long.valueOf(3600000));
+            } catch (Throwable e) {
+                //ignore
+            }
+        } finally {
+            Thread.currentThread().setContextClassLoader(orig);
+        }
+        
+    }
+
+}

Propchange: cxf/trunk/common/common/src/main/java/org/apache/cxf/common/logging/JDKBugHacks.java
------------------------------------------------------------------------------
    svn:eol-style = native

Propchange: cxf/trunk/common/common/src/main/java/org/apache/cxf/common/logging/JDKBugHacks.java
------------------------------------------------------------------------------
    svn:keywords = Rev Date

Modified: cxf/trunk/common/common/src/main/java/org/apache/cxf/common/logging/Log4jLogger.java
URL: http://svn.apache.org/viewvc/cxf/trunk/common/common/src/main/java/org/apache/cxf/common/logging/Log4jLogger.java?rev=897310&r1=897309&r2=897310&view=diff
==============================================================================
--- cxf/trunk/common/common/src/main/java/org/apache/cxf/common/logging/Log4jLogger.java (original)
+++ cxf/trunk/common/common/src/main/java/org/apache/cxf/common/logging/Log4jLogger.java Fri
Jan  8 19:46:40 2010
@@ -52,6 +52,8 @@
     private final org.apache.log4j.Logger log;
 
     static {
+        JDKBugHacks.doHacks();
+        
         //older versions of log4j don't have TRACE, use debug
         org.apache.log4j.Level t = org.apache.log4j.Level.DEBUG;
         try {



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