headless exception

[James Hevener]

We recently began to move an application from our development environment to
our change environment. Two different AS400 systems where the data and
procedures live.

We have a x86 Linux box that is our actual WAS6 sp.02 system. Now trying to
access the application - we are seeing "Headless Exception" in the JVM log
and our application no longer works.

From a system administrators point of view, I am trying to understand this
error message - and what are possible causes. Am I reading this correctly
that the application is headless - as something has failed to build the
information it needs in order to do a display?

See a snippet below. Thanks in advance, Jim

at
com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(WorkQueueManager.java:1039)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1455)

[8/5/05 11:16:53:938 EDT] 00000030 LocalTranCoor E WLTC0017E: Resources
rolled back due to setRollbackOnly() being called.
[8/5/05 11:16:53:939 EDT] 00000030 WebApp E SRVE0026E: [Servlet
Error]-[/test2.jsp]: java.awt.HeadlessException
at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:150)
at java.awt.Window.<init>(Window.java:311)
at java.awt.Frame.<init>(Frame.java:431)
at java.awt.Frame.<init>(Frame.java:396)
at
com.ibm.as400.access.ToolboxSignonHandler.displayMessage(ToolboxSignonHandler.java:336)
at
com.ibm.as400.access.ToolboxSignonHandler.displayMessage(ToolboxSignonHandler.java:323)
at
com.ibm.as400.access.ToolboxSignonHandler.passwordIncorrect(ToolboxSignonHandler.java:136)
at com.ibm.as400.access.AS400.promptSignon(AS400.java:2183)
at com.ibm.as400.access.AS400.signon(AS400.java:3336)
at com.ibm.as400.access.AS400.connectService(AS400.java:853)

[Ken Hygh]

James Hevener wrote:

>We recently began to move an application from our development environment to
>our change environment. Two different AS400 systems where the data and
>procedures live.
>
>We have a x86 Linux box that is our actual WAS6 sp.02 system. Now trying to
>access the application - we are seeing "Headless Exception" in the JVM log
>and our application no longer works.
>
>From a system administrators point of view, I am trying to understand this
>error message - and what are possible causes. Am I reading this correctly
>that the application is headless - as something has failed to build the
>information it needs in order to do a display?
>
>See a snippet below. Thanks in advance, Jim
>
> at
>com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(WorkQueueManager.java:1039)
> at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1455)
>
>[8/5/05 11:16:53:938 EDT] 00000030 LocalTranCoor E WLTC0017E: Resources
>rolled back due to setRollbackOnly() being called.
>[8/5/05 11:16:53:939 EDT] 00000030 WebApp E SRVE0026E: [Servlet
>Error]-[/test2.jsp]: java.awt.HeadlessException
> at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:150)
>
>

This means that the XWindows libraries are not installed on the machine
where the tests are being run, and something in your application is
trying to build graphics.

Ken

[Damon Youmans]

I have run into this for applications the generate graphics on a Linux
server. To fix use this generic JVM argument: -Djava.awt.headless=true

[James Hevener]

Interesting. This application actually never displays anything on the Linux
server where it lives. We did find a library that we were missing on our
application configuration, I am just confused as to why this library was not
needed previously - and that library "ANALYZE" lives on our AS400.

The application is hosted on SuSE Linux Enterprise 9 sp2. Running WAS6 Base
sp.02.

The AS400 holds Stored Procedures, libraries, and DB2.

"Damon Youmans" <dyou...@guideone.com> wrote in message
news:ddajdp$5j88$1...@news.boulder.ibm.com...

[Lukasz Szelag]

The application not need to display anything; it can just use graphics
API. We encountered the same problem when using jasperreports to
generate reports (java.awt.headless=true fixed it).