Jmyra Observer


















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FAQ

All Editions of JMyra

Q: What are the software requirements for JMyra
A: JMyra is designed to be used in Java 2 application (JDK 1.2 and above). Besides the standard Java libraries you meed some additional Sun Java extension (like JMX) on the server side. These extensions are distributed with JMyra. To access JMyra via HTTP any web browser should do.

Q: Do I need a web server to run JMyra?
A: No, JMyra contains its own lightweight web server.

Q: I am using JMyra in a servlet, but it doesn't work correctly. I'm getting error messages like "Port already in use".
A: You are using JMyra in an environment that uses multiple class loaders to separate different web applications. Don't put JMyra in the classpath of individual web apps. Instead put it in the global class path used by the servlet VM itself. Where you define this classpath varies between different servlet engines.
If you are using Resin you can just use the CLASSPATH environment variable, or modify the wrapper.pl script.

Q: I'm running JMyra on a Unix or Linux server, and the statistics graphics won't display at all
A:These graphics are created using the Java graphics API. Under Unix or Linux this API needs a running X11 to create the graphics. If you don't have X11 on your server and you are jusing JDK 1.4 or later setting the sytem property java.awt.headless=true should do the trick. Otherwise you might have a look at http://www.eteks.com/pja/en/index.jsp for a pure Java AWT Tookit (GPL), or try the Xvb (X virtual frame buffer) that comes with XFree86.

Q: How can I rotate my logfiles? They keep getting too big.
A: You can use the same macros you use for formatting the log messages to create the log file name. To rotate the logfiles on a regular basis just put a $(time) or $(date) macro in the file name, i.e. if you want a new logfile every hour use something like /your/path/here/$(time:HHmmss).log

Q: Does JMyra support the Java Logging API?
A: In addition to its own logging API JMyra supports the Java Logging API, if you are using JDK 1.4 or later. The JMyra Logging API is supported on JDK 1.2 or later.

Q: When I try to connect to JMyra with Microsoft Internet Explorer I get an error page
A: This happens when you don't specify the http:// part of the URL. Microsoft Internet Explorer only uses HTTP with the default HTTP port, or when you explicitly specify it. So a localhost:7000 will not work, you have to use http://localhost:7000

Q: I want to use JMyra in an EJB (or a servlet), but JMyra doesn't seem to initialize correctly.
A: Most EJB and servlet environments restrict the access rights of the application. You need to give JMyra special rights to function in this environment. For details see the online documentation that comes wtith JMyra.

Q: I get a SecurityException or an AccessControlException when I use JMyra in my application.
A: You obviously have Java security enabled. (This is the default with most servlet and EJB environments). You need to give JMyra special access rights to function in this environment. See the online documentation that comes with JMyra for details.

Enterprise Edition of JMyra

Q: I forgot the password of the admin user, and no other user has administrator rights.
A: Delete the file admin.user from the configuration directory and restart your application. The user admin will be regenerated with the password admin. Remember to change the password!

Q: I changed the rights of the admin user or the admin group, and now the access to the administrator pages is denied.
A: Delete the filed admin.user and Admin.group from the configuration directory. Restart your application. The Group Admin and the user admin will be regenerated with the default settings, including the default password admin. Remember to change the password!

Q: The statistics graphics won't display
A: There are several conditions that must be met to be able to display the statistics graphics:
- jfreechart.jar and jcommon.jar must be in the classpath
- statistical data must be present. For the system memory and thread count statistics start the respective watchdog threads. There is another question that deals with special unix problems affecting the graphics display.

Test License

Q: When I test JMyra with a test license, is the functionality limited in any way?
A: With a test license you have the full functionality of JMyra. When the license expires JMyra will stop working (without breaking your application), but otherwise the JMyra is fully functional.

Q: I am currently testing JMyra with a test license. What happens when the test license expires?
A: The web interface of JMyra will no longer work, and all logging configuration will be ignored. All log messages will be written to stdout. If the Java logging API (from JDK 1.4 on) if used, log messages will be processed by the standard java logging classes.

Q: I didn't really get around to testing JMyra before the test license expired. Can I get an extension?
A: Of course. Just drop us a line at support@jmyra.com