[Wrapper-user] JVM hang - Xms / Xmx

[Paul C. <cas...@au...>]

Hi All,

We've had problems with our JVM hanging from time to time.  The Wrapper
restarted it each time faithfully, which saved heartache and downtime.

I started looking into the initial / maximum heap values, and while I
couldn't find much info about how they relate to garbage collection, there
were comments that suggested setting them to different values (rather than
the same).  I did this, and the JVM hasn't hung in the past 3 weeks - which
is fantastic!

Has this worked for anyone else - or is anyone else having JVM hanging
issues?

What I have noticed is that we are now getting
INFO   | jvm 1    | 2004/03/31 12:26:33 | java.lang.OutOfMemoryError

followed by some ok
INFO   | jvm 1    | 2004/03/31 12:32:25 | Received a packet PING : ping
INFO   | jvm 1    | 2004/03/31 12:32:25 | Send a packet PING : ok
DEBUG  | wrapperp | 2004/03/31 12:32:25 | read a packet PING : ok
DEBUG  | wrapper  | 2004/03/31 12:32:25 | Got ping response from JVM

and then later followed by the JVM exiting with the following:
INFO   | jvm 1    | 2004/03/31 12:32:31 | An unexpected exception has been
detected in native code outside the VM.
INFO   | jvm 1    | 2004/03/31 12:32:31 | Unexpected Signal :
EXCEPTION_ACCESS_VIOLATION occurred at PC=0x718872c4
INFO   | jvm 1    | 2004/03/31 12:32:31 | Function
name=Java_sun_awt_font_NativeFontWrapper_registerCompositeFont
INFO   | jvm 1    | 2004/03/31 12:32:31 | Library=D:\jdk1.3.1
_09\jre\bin\fontmanager.dll
INFO   | jvm 1    | 2004/03/31 12:32:31 |
INFO   | jvm 1    | 2004/03/31 12:32:31 | Current Java thread:
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
sun.awt.font.NativeFontWrapper.drawStringIntDiscreteRaster(Native Method)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
sun.java2d.loops.ICRDrawStringRasterContext.invoke(TextRendering.java:321)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
sun.awt.image.BufferedImageGraphics2D.drawString(BufferedImageGraphics2D.java:1120)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
sun.java2d.SunGraphics2D.drawString(SunGraphics2D.java:2253)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
rcis.render.MI002RNDBAnnotation.paint(MI002RNDBAnnotation.java:124)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
rcis.render.MI002BackgroundRenderer.<init>(MI002BackgroundRenderer.java:253)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
rcis.render.MI002Renderer.<init>(MI002Renderer.java:73)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
rcis.map.MA001MemoryModel.getMapImage(MA001MemoryModel.java:249)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
java.lang.reflect.Method.invoke(Native Method)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:236)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
sun.rmi.transport.Transport$1.run(Transport.java:147)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
java.security.AccessController.doPrivileged(Native Method)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
sun.rmi.transport.Transport.serviceCall(Transport.java:143)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
INFO   | jvm 1    | 2004/03/31 12:32:31 |       at
java.lang.Thread.run(Thread.java:479)

Our application deals with GIS, which disperses GIF files to the clients,
or generates postscript files for plotting, which is where the drawString
is being used.

Has anyone else experienced similar issues?  This is one I'd like to
rectify.

PS: JDK 1.3.1_09 on Win2K Advanced Server.

Regards,

Paul Casanova