![]() The other command that I've used most often from that console is the trace level from 0-5: ![]() If you hit "t" in that window, you'll see the following: This article is a bit old but is still relevant (including a section entitled "How to Debug Applets in Java Plug-in").Įdit: perhaps a better way to get stacktraces is to use the Java plugin console. Save the configuration, and once your browser is running the plug-in (with the JVM suspended or not) run the remote debugger to connect to the plug-in JVM, with a project containing your applet sources open. You might have to inlude the src.zip in your JDK on the sources tab to have the Java core class sources available. Make sure connection type is "Socket Attach", choose localhost as the host if your browser is local, and the port you chose earlier (2502 in the example). In Eclipse, for instance, choose Run / Debug Configurations. That way when you access an applet page, the browser will appear to freeze as the JVM immediately gets suspended waiting for a debugger to connect.ģ) Use your favorite IDE to Remotely debug the Java Plug-in The port (using 2502 here, you can use pretty much any free port, just write it down for later) and the suspend - if you need to debug the applet startup, classloading, etc, set this to "y". Something like this: piler=NONE -Xnoagent -Xdebug -Xrunjdwp:transport=dt_socket,address=2502,server=y,suspend=n Without this you won't be able to meaningfully step into core class code in your debugger.Īnd add the options to enable debugging. The files inside the JDK were compiled with the debugging information included (source-code line number information, variable names, etc) and the JRE files don't have this information. ![]() jar files from JDK_HOME/jre/lib to JRE_HOME/lib (Download and) Install a JDK for the same version as your JRE.Ĭopy the. Here's what you can do to effectively debug applets in the browser:ġ) Obtain debugging info for the binaries However, sometimes to debug some security related stuff the browser plugin environment is just too different from appletviewer. It allows you to view the stack traces of each thread and even view all object instances.ĪppletViewer is very handy, you can do a "Run as / Java Applet" from Eclipse to run, or "Debug As / Java Applet" to debug your applet classes. Aside from the obvious use of the Java console and the applet viewer, starting from Java 6 update 7, you can use the VisualVM that comes with the JDK (JDK_HOME/bin/visualvm).
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