Java Webservice calling C function through JNI

I have a java class that is using the JNI to call native interface written in C. The called C function has dependencies in vendor supplied c function library in .lib (CAUEVT.LIB) format. I compiled the C function as .DLL file and put the .DLL file in the -Djava.library.path and same thing I put in the opmn.xml file for the Java option.
Now, when I run the Java class from command line it works fine and makes call to the external system everything works fine.
However, when I deploy the same as web service and try to test the web service, Java expects the external library also in .DLL format (The error message is "This application has failed to start because CAUEVT.dll was not found. Re-installing the application may fix this problem")
If I look the application log file, I see the following error.
java.lang.UnsatisfiedLinkError: D:\lib\CAEventLoggerImp.dll: Can't find dependent libraries
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1751)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1676)
I am wondering if the java class can run without any problem, why is the webservice execution fails....?

The problem was that when Java loads the shared DLL we create from the java.library.path setting, but if the loaded DLL refers to any other DLL, it expects it from the System path. And for some reason, OC4J, doesn't expose all the system path unless entered in the Evnironment Variable explicitly in the Administration tab in OEM., server properties in the OEM. (opmn.xml)
IT works fine after these changes.

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