FAQOff course there is still a lot
that may go wrong.
My Java program doesnt start.
Run JSL in debug from command line using jsl -debug.
Create some debug output in your Java program. Only if
things are fine in debug mode install it as a service.
One common issues is mounted network drives, which
are not visible from a service. Use UNC path instead
The JSL won't start JRockit
Set the jvmtype parameter in the jsl.ini file to
jrockit. JRockit uses a strange naming convention for the
JVM location. It's located in jre\bin\jrockit\jvm.dll.
Another approach is to move the jrockit folder to
jre\bin\classic\jvm.dll and it will work nicely.
The JSL fails to start saying the a DLL is missing.
When running the plain jsl.exe, which is a bit
smaller and dynamically linked you will need a few
Microsfot Visual C libraries, which most likely are already
on your system. If you see problems, try the statically
linked executable which has no such dependencies.
When do I need 32bit and 64bit versions?
You need a 64bit OS to run 64bit JSL, but you can
also run the 32bit version on a 64bit OS. The 64bit JSL
starts the 64bit JVM and the 32bit JSl run the 32bit
Which Java Runtime Environment is used when I start the
JSL attempts to find the JRE in the following
location in the order given. For details look into
- It reads the jrepath parameter from the configuration
- It loks for a java.dll in the bin directoy colocated
with the jsl.exe
- It loks for a java.dll in the jre\bin directoy
colocated with the jsl.exe
- It looks for JRE path in the registry
How can I make sure the JAVA application is restarted
after it fails
JSL doesn't care about this, but Windows (Server)
comes with tools to monitor and automatically restart
service. Those tools will usually rely on the service
return code to decide if the shutdown was normal or
abnormal. JSL has a number of settings to pass the the java
exit code or to react to exception in appropriate ways.
See 'exceptionerrorcode' and 'onexiterror' settings
in the configuration file.
The program did run fine in debug mode but can't find
files when run as a service
Don't rely on the standard path when locating files
from the service. Always use absolute paths. The service
will find it's start path through a java system property.
You can use environment substitutions now but be careful
and make your first tries without them.
How can I find out from which directory the service was
started and how it is named
The JVM is started with a command line similar to
The -D options can be accessed through the System
Properties. Look in class java.lang.System for details.
-Dservice.name=TelnetEcho -cp e:\java\test\jsl_0_9
The program did run fine in debug mode but still does
not find the files it needs though I load them from an
Drives mounted from a network device are not
accessible from a service!
Access them through fully qualified network
The program did run fine in debug mode but is denied
access to the network shares I need
In standard settings the service will run as a
system user. Sytem user can't access the network. You need
to change the security settings manually in the NT service
There may be other more exotic errors which could
result from this.
The service runs fine but I can't stop it. Service
manager tells me the stop request failed and I can't stop
it using the task manager.
Services can not be stopped forcedly (except with a
debugger). They must stop themselves. That's what the JNI
calls into the running JVM are for. You may also use the
Please see the HowTo guide.
To get rid of your service you must either restart
NT (after you set service starting mode to manual) or use a
C debugger to attach to and kill the service.