Index: web/web-glue/src/main/java/com/sun/enterprise/web/WebContainer.java
===================================================================
--- web/web-glue/src/main/java/com/sun/enterprise/web/WebContainer.java	(revision 34715)
+++ web/web-glue/src/main/java/com/sun/enterprise/web/WebContainer.java	(working copy)
@@ -43,6 +43,7 @@
 import java.util.*;
 import java.util.logging.Level;
 import java.util.logging.Logger;
+import javax.imageio.ImageIO;
 import javax.servlet.*;
 import javax.servlet.jsp.JspFactory;
 import javax.servlet.jsp.tagext.JspTag;
@@ -571,6 +572,13 @@
         Thread.currentThread().setContextClassLoader(
             getClass().getClassLoader());
         try {
+            /*
+             * Trigger a call to sun.awt.AppContext.getAppContext(). This will
+             * pin the common class loader in memory and fix a memory leak
+             * affecting the WebappClassLoader that was caused by a JRE
+             * implementation change in 1.6.0_15 onwards.
+             */
+            ImageIO.getCacheDirectory();
             _embedded.start();
         } catch (LifecycleException le) {
             _logger.log(Level.SEVERE,