In its day, the site was useful to many people and for that I'm glad. It has been around so long, that I lost track of when it first went live. For now, the site will remain available just for the sake of digital archaeologists. Simply put, it is not needed any more as very few people use Java applets in a web browser. Tracing set through the Control Panel takes effect when Java Plug-in or Java Web Start is launched, but changes made through the Control Panel while Java Plug-in or Java Web Start is running has no effect until restarted.September 2018: The time has come to retire this website. See Section 20.3.2, "Java Runtime Parameters" for more information. For example, to enable tracing for everything (option 5 above), enter the following options in the "Java Run Time Parameters" textfield: See Section 22.1, "Debugging Options in the Java Console" for information.Īnother way to set fine-grained tracing is through the Java Control Panel. To enable tracing while running, you can set trace-level options (0-5) in the Java Console, with the following meanings:Ĥ: extension, security, network and basicĥ: LiveConnect, extension, security, network, temp, basic, and Deployment Rule Set To use all of the tracing levels, set to all. The property can have one of the following values: To enable more fine-grained tracing, the property can be used. This property turns on all tracing facilities inside Java Plug-in and Java Web Start. Tracing for Java Plug-in and Java Web Start can be turned on by setting the property ace property to true. This sets the trace-level options as described in Section 22.2, "Tracing and Logging" Section 22.2, "Tracing and Logging.". Modified jar files will be downloaded from the server when a page with an applet is refreshed or revisited if you first do this: type "x" in the Java Console to clear the Classloader cache. This removes (destroys) all ClassLoader objects in the cache. Individual listings of threads will show the thread name, the thread priority, alive if the thread is alive or destroyed if the thread is in the process of being destroyed, and daemon if the thread is a daemon thread. Following Group main, other thread groups will be shown as Group, where name is the URL associated with an applet. pri stands for priority it is the priority of a thread group. agc stands for active group count it is the number of active child thread groups of a thread group. ac stands for active count it is the total number of active threads in a thread group and its child thread groups. Prints out all the existing thread groups. Triggers logging, which directs output from the Java Plug-in Console to a log file.Ĭauses the Java Console to disappear from the main screen. info is a value used for debugging.ĭisplays heap memory usage as described above. cache = true indicates that the applet should be cached, while false indicates that the applet will be destroyed when the page is left. zombie = true indicates that a ClassLoader object is not being used (i.e., the applet is not currently loaded on the page). Additional information displayed with a ClassLoader object includes zombie, cache and info. To identify a ClassLoader object, the "classloader list" displays the codebase for that object. These objects are created and cached according to their codebase. When a page is visited the first time, a ClassLoader object will be created and all of the classes that are downloaded will be cached in that object. Classes are cached to avoid having to load them again when returning to previously-visited pages. Triggers garbage collection and displays memory information as described above.ĭisplays help message, which is being described here.ĭisplays a list of the cached ClassLoader objects in the Java Plug-in. The percent (xx%) is the free memory as a percent of the total heap size. Free is the available memory that is free in the heap. Memory refers to the current heap size used by the JRE. Triggers finalization on the objects in the finalization queue and then displays memory information. Table 22-1 Java Console Debugging Options Key
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