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From slaur...@apache.org
Subject svn commit: r1174353 - in /tomcat/trunk: java/org/apache/catalina/core/JreMemoryLeakPreventionListener.java java/org/apache/catalina/core/LocalStrings.properties webapps/docs/config/listeners.xml
Date Thu, 22 Sep 2011 20:01:52 GMT
Author: slaurent
Date: Thu Sep 22 20:01:52 2011
New Revision: 1174353

URL: http://svn.apache.org/viewvc?rev=1174353&view=rev
Log:
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=51862
bug 51862: JreMemoryLeakPreventionListener enhancement to load configurable classes 
https://issues.apache.org/bugzilla/show_bug.cgi?id=51862

Modified:
    tomcat/trunk/java/org/apache/catalina/core/JreMemoryLeakPreventionListener.java
    tomcat/trunk/java/org/apache/catalina/core/LocalStrings.properties
    tomcat/trunk/webapps/docs/config/listeners.xml

Modified: tomcat/trunk/java/org/apache/catalina/core/JreMemoryLeakPreventionListener.java
URL: http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/core/JreMemoryLeakPreventionListener.java?rev=1174353&r1=1174352&r2=1174353&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/catalina/core/JreMemoryLeakPreventionListener.java (original)
+++ tomcat/trunk/java/org/apache/catalina/core/JreMemoryLeakPreventionListener.java Thu Sep
22 20:01:52 2011
@@ -24,6 +24,7 @@ import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLConnection;
 import java.sql.DriverManager;
+import java.util.StringTokenizer;
 
 import javax.imageio.ImageIO;
 import javax.xml.parsers.DocumentBuilderFactory;
@@ -202,7 +203,21 @@ public class JreMemoryLeakPreventionList
     public void setDriverManagerProtection(boolean driverManagerProtection) {
         this.driverManagerProtection = driverManagerProtection;
     }
-
+    
+    /**
+     * List of comma-separated fully qualified class names to load and initialize during
+     * the startup of this Listener. This allows to pre-load classes that are known to 
+     * provoke classloader leaks if they are loaded during a request processing.
+     */
+    private String classesToInitialize = null;
+    public String getClassesToInitialize() {
+        return classesToInitialize;
+    }
+    public void setClassesToInitialize(String classesToInitialize) {
+        this.classesToInitialize = classesToInitialize;
+    }
+    
+    
     @Override
     public void lifecycleEvent(LifecycleEvent event) {
         // Initialise these classes when Tomcat starts
@@ -419,6 +434,22 @@ public class JreMemoryLeakPreventionList
                         }
                     }
                 }
+                
+                if (classesToInitialize != null) {
+                    StringTokenizer strTok =
+                        new StringTokenizer(classesToInitialize, ", \r\n\t");
+                    while (strTok.hasMoreTokens()) {
+                        String classNameToLoad = strTok.nextToken();
+                        try {
+                            Class.forName(classNameToLoad);
+                        } catch (ClassNotFoundException e) {
+                            log.error(
+                                sm.getString("jreLeakListener.classToInitializeFail",
+                                    classNameToLoad), e);
+                            // continue with next class to load
+                        }
+                    }
+                }
 
             } finally {
                 Thread.currentThread().setContextClassLoader(loader);

Modified: tomcat/trunk/java/org/apache/catalina/core/LocalStrings.properties
URL: http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/core/LocalStrings.properties?rev=1174353&r1=1174352&r2=1174353&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/catalina/core/LocalStrings.properties (original)
+++ tomcat/trunk/java/org/apache/catalina/core/LocalStrings.properties Thu Sep 22 20:01:52
2011
@@ -83,6 +83,7 @@ jreLeakListener.jarUrlConnCacheFail=Fail
 jreLeakListener.xmlParseFail=Error whilst attempting to prevent memory leaks during XML parsing
 jreLeakListener.authPolicyFail=Error whilst attempting to prevent memory leak in javax.security.auth.Policy
class
 jreLeakListener.ldapPoolManagerFail=Failed to trigger creation of the com.sun.jndi.ldap.LdapPoolManager
class during Tomcat start to prevent possible memory leaks. This is expected on non-Sun JVMs.
+jreLeakListener.classToInitializeFail=Failed to load class {0} during Tomcat start to prevent
possible memory leaks.
 naming.wsdlFailed=Failed to find wsdl file: {0}
 naming.bindFailed=Failed to bind object: {0}
 naming.jmxRegistrationFailed=Failed to register in JMX: {0}

Modified: tomcat/trunk/webapps/docs/config/listeners.xml
URL: http://svn.apache.org/viewvc/tomcat/trunk/webapps/docs/config/listeners.xml?rev=1174353&r1=1174352&r2=1174353&view=diff
==============================================================================
--- tomcat/trunk/webapps/docs/config/listeners.xml (original)
+++ tomcat/trunk/webapps/docs/config/listeners.xml Thu Sep 22 20:01:52 2011
@@ -181,6 +181,16 @@
         Defaults to <code>false</code> because an AWT thread is launched.</p>
       </attribute>
 
+      <attribute name="classesToInitialize" required="false">
+        <p>List of comma-separated fully qualified class names to load and initialize

+        during the startup of this Listener. This allows to pre-load classes that are 
+        known to provoke classloader leaks if they are loaded during a request 
+        processing. Non-JRE classes may be referenced, like 
+        <code>oracle.jdbc.driver.OracleTimeoutThreadPerVM</code>.
+        The default value is empty, but specific JRE classes are loaded by other leak 
+        protection features managed by other attributes of this Listener.</p>
+      </attribute>
+
       <attribute name="driverManagerProtection" required="false">
         <p>The first use of <code>java.sql.DriverManager</code> will trigger
the
         loading of JDBNC Driver in the the current class loader. The web



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