Re: Major Tomcat classloading issues with javaagent command line switch
2010/4/7 Arshan Dabirsiaghi : > Just to close the loop here, the problem was that the class was being loaded > twice - once from inside the *agent* jar, and another duplicate later from > WEB-INF/classes. I guess Tomcat or Java was confused as to which version they > wanted to use. Not 100% sure what happened, but removing it from the agent > jar fixed the problem. The servlet spec requires that the webapp classes and libraries were preferred over the ones provided by Tomcat. More details in [1]At the same time, web applications are short-lived and can be stopped / undeployed at any time, at which point their classloader and their classes become unavailable. Using those for something that is JVM-wide may lead to leaked memory at best, or do not work at all. [1] http://tomcat.apache.org/tomcat-6.0-doc/class-loader-howto.html Best regards, Konstantin Kolinko - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Major Tomcat classloading issues with javaagent command line switch
Just to close the loop here, the problem was that the class was being loaded twice - once from inside the *agent* jar, and another duplicate later from WEB-INF/classes. I guess Tomcat or Java was confused as to which version they wanted to use. Not 100% sure what happened, but removing it from the agent jar fixed the problem. Thanks! Arshan -Original Message- From: Christopher Schultz [mailto:ch...@christopherschultz.net] Sent: Tuesday, April 06, 2010 11:50 AM To: Tomcat Users List Subject: Re: Major Tomcat classloading issues with javaagent command line switch -BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Arshan, On 4/6/2010 11:18 AM, Christopher Schultz wrote: > The command line for my running JVM looks like this: > > /usr/bin/java -Dnop -Xmx64M > -agentpath:/home/cschultz/yjp-8.0.6/bin/linux-x86-32/libyjpagent.so= Sorry, I didn't see that you were using a Java-language agent. I haven't tried this. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAku7WDUACgkQ9CaO5/Lv0PBGTACdG2gUuUsT55SlfDKKOGgagp27 qG4An2LtLnwavrnj79jPJ6oUwQZowhhW =Mx79 -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Major Tomcat classloading issues with javaagent command line switch
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Arshan, On 4/6/2010 11:18 AM, Christopher Schultz wrote: > The command line for my running JVM looks like this: > > /usr/bin/java -Dnop -Xmx64M > -agentpath:/home/cschultz/yjp-8.0.6/bin/linux-x86-32/libyjpagent.so= Sorry, I didn't see that you were using a Java-language agent. I haven't tried this. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAku7WDUACgkQ9CaO5/Lv0PBGTACdG2gUuUsT55SlfDKKOGgagp27 qG4An2LtLnwavrnj79jPJ6oUwQZowhhW =Mx79 -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Major Tomcat classloading issues with javaagent command line switch
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Arshan, On 4/6/2010 12:04 AM, Arshan Dabirsiaghi wrote: > The bottom line appears to be this: across Tomcat and JDK versions, you > can't use the javaagent switch and have a working web app. This works for me under the following environment: $ bin/catalina.sh version Using CATALINA_BASE: /usr/local/apache-tomcat-6.0.26 Using CATALINA_HOME: /usr/local/apache-tomcat-6.0.26 Using CATALINA_TMPDIR: /usr/local/apache-tomcat-6.0.26/temp Using JRE_HOME:/usr Using CLASSPATH: /usr/local/apache-tomcat-6.0.26/bin/bootstrap.jar Server version: Apache Tomcat/6.0.26 Server built: March 9 2010 1805 Server number: 6.0.26.0 OS Name:Linux OS Version: 2.6.18-14-fza-686-bigmem Architecture: i386 JVM Version:1.6.0_12-b04 JVM Vendor: Sun Microsystems Inc. The command line for my running JVM looks like this: /usr/bin/java -Dnop -Xmx64M - -agentpath:/home/cschultz/yjp-8.0.6/bin/linux-x86-32/libyjpagent.so= - -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager - -Djava.endorsed.dirs=/usr/local/apache-tomcat-6.0.26/endorsed -classpath /usr/local/apache-tomcat-6.0.26/bin/bootstrap.jar - -Dcatalina.base=/home/cschultz/.webapps/xxx - -Dcatalina.home=/usr/local/apache-tomcat-6.0.26 - -Djava.io.tmpdir=/home/cschultz/.webapps/xxx/temp org.apache.catalina.startup.Bootstrap start What does yours look like? - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAku7UNUACgkQ9CaO5/Lv0PCxFwCfa5/zxoTvyYF5x9/sNy2STxGY Pb8AoIMd66jZvvTqqmu1yTZzg2/+U0Np =8BCW -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Major Tomcat classloading issues with javaagent command line switch
I've tried this outside Eclipse with Tomcat 6.0.26 on both Java 1.5.0_22 and Java 1.6.0_18: SET JAVA_OPTS=-javaagent:C:\path-to-agent.jar JSP's seem to work fine, but anytime you try to access a Servlet you get the same thing: javax.servlet.ServletException: Error allocating a servlet instance org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java :102) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:2 98) org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.j ava:859) org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.proce ss(Http11AprProtocol.java:579) org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555) java.lang.Thread.run(Thread.java:619) java.lang.NoClassDefFoundError: javax/servlet/http/HttpServlet java.lang.ClassLoader.findBootstrapClass(Native Method) java.lang.ClassLoader.findBootstrapClassOrNull(ClassLoader.java:927) java.lang.ClassLoader.loadClass(ClassLoader.java:298) java.lang.ClassLoader.loadClass(ClassLoader.java:296) sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) java.lang.ClassLoader.loadClass(ClassLoader.java:248) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader .java:1431) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader .java:1361) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java :102) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:2 98) org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.j ava:859) org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.proce ss(Http11AprProtocol.java:579) org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555) java.lang.Thread.run(Thread.java:619) Can anyone else confirm? Arshan -Original Message- From: Caldarale, Charles R [mailto:chuck.caldar...@unisys.com] Sent: Tuesday, April 06, 2010 12:34 AM To: Tomcat Users List Subject: RE: Major Tomcat classloading issues with javaagent command line switch > From: Arshan Dabirsiaghi [mailto:arshan.dabirsia...@aspectsecurity.com] > Subject: Major Tomcat classloading issues with javaagent command line > switch > > The bottom line appears to be this: across Tomcat and JDK versions, you > can't use the javaagent switch and have a working web app. Wrong conclusion. Try running Tomcat directly, not under Eclipse; the problem you're having is most likely due to Eclipse insisting on doing things its own way, ignoring configuration that you have set up. Deploy your war to a stand-alone Tomcat and try it again. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
RE: Major Tomcat classloading issues with javaagent command line switch
> From: Arshan Dabirsiaghi [mailto:arshan.dabirsia...@aspectsecurity.com] > Subject: Major Tomcat classloading issues with javaagent command line > switch > > The bottom line appears to be this: across Tomcat and JDK versions, you > can't use the javaagent switch and have a working web app. Wrong conclusion. Try running Tomcat directly, not under Eclipse; the problem you're having is most likely due to Eclipse insisting on doing things its own way, ignoring configuration that you have set up. Deploy your war to a stand-alone Tomcat and try it again. - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
