Re: [Wrapper-user] Error occured when JNI code is executed

[Leif M. <le...@ta...>]

HMM I replied to this yesterday but it never showed up on the
list!?!

Here is a repost.
-Leif

---
Yasir,

> I downloaded Java Service Wrapper today and now trying to run my 
> application using method 1 on windows 2000. My application interact 
> with some of NT native functionality using JNI. Now problem is that 
> when I start my application on clicking on the MyApp.bat file my 
> application starts executing and execution fails when it tries to load 
> a DLL with following exception (please note that I have not installed 
> the service yet for my application)
>  
> jvm 1    | System tray DLL error
> jvm 1    | System tray ICON error
> jvm 1    | java.lang.UnsatisfiedLinkError: nativeMoveToFront
> jvm 1    |      at 
> com.gc.systray.SystemTrayIconManager.nativeMoveToFront(Native Method)
> jvm 1    |      at 
> com.gc.systray.SystemTrayIconManager.<init>(SystemTrayIconManager.java:69) 
>
> jvm 1    |      at 
> com.gc.systray.DefaultSystemTray.<init>(DefaultSystemTray.java:48)
> jvm 1    |      at ASC_SplashScreen$2.run(ASC_SplashScreen.java:98)
> jvm 1    |      at java.lang.Thread.run(Unknown Source)
>  
> Any ideas why JNI is not working properly?


When your application was running without the Wrapper, it was
using a native library.  Java locates its native libraries using a
special library path.   This was either specified on the command
line or as an environment variable.  When you locate it, you will
need to add an additional line to the wrapper.conf file to tell
the wrapper where to locate the additional native libraries.  It
will look something like this:

wrapper.java.library.path.1=../lib
wrapper.java.library.path.2=c:/AdditionalJNILibraries/lib 

> Also I want to know that as my application is running under a wrapper, 
> performance of my application will be affected, what u people say 
> about performance issue?

I have never noticed any performance differences when using the
Wrapper.  It is designed to be very light weight.  The exception
is when you dump very large quantities of output to the console.
Then there is a slight performance decrease but it is small and
can be worked around in a number of ways using java site logging
tools.

Cheers,
Leif