Hi Shay,
Thanks for your input. And yes, I did see the "Load library successful"
message. I've also fixed the code with static { } block. However, I still
received the same error message. Any other thoughts?
Thanks,
Dennis
2010/7/2 Shay Rojansky <[email protected]>
> Hi Dennis.
>
> So do you see the "Load library successful" message?
>
> Also, if I remember correctly, the code in eval.java is not a safe way to
> load a native library. It's a very good idea to place the
> System.loadLibrary
> in a static { } block, instead of in a method. The way your class is
> written, it's possible for the run method to be executed more than once, in
> which case loadLibrary will be called more than once (and so will the
> native
> initModels). Not sure what the effects are and if it's related to your
> problem but it's a good idea to avoid trouble by fixing it.
>
> Shay
>
> On Fri, Jul 2, 2010 at 3:46 AM, dennis ch <[email protected]> wrote:
>
> > Hi,
> >
> > I have a java class (eval.java) that invokes a native method in an so
> file
> > (libmodel.so, using SWIG 1.3.29 to generate JNI code/wrapper and compiled
> > the library). I can use System.loadLibrary() to load the libmodel.so
> > without
> > any error (-Djava.library.path=/usr/lib), and the native method
> initModel()
> > works fine as a standalone application.
> >
> > However, when I deploy it as a web service (tomcat 6.0.26 + axis2 1.5.1 +
> > eclipse jee helios) to call the native method, I got the following error
> > (the first line means the .so was successfully loaded):
> >
> > Load library successfully
> >
> > [ERROR] com.model.modelJNI.initModel()V
> > java.lang.reflect.InvocationTargetException
> > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> > at
> >
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> > at
> >
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> > at java.lang.reflect.Method.invoke(Method.java:597)
> > at
> >
> org.apache.axis2.rpc.receivers.RPCUtil.invokeServiceClass(RPCUtil.java:194)
> > at
> >
> org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:102)
> > at
> >
> org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java:40)
> > at
> >
> org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:114)
> > at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:173)
> > at
> >
> org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:167)
> > at
> > org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:142)
> > at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
> > at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
> > at
> >
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
> > at
> >
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> > at
> >
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
> > at
> >
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
> > at
> >
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
> > at
> >
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
> > at
> >
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
> > at
> >
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
> > at
> >
> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
> > at
> >
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
> > at
> > org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
> > at java.lang.Thread.run(Thread.java:619)
> > Caused by: java.lang.UnsatisfiedLinkError:
> com.model.modelJNI.initModel()V
> > at com.model.modelJNI.initModel(Native Method)
> > at com.model.model.initModel(model.java:13)
> > at com.webservice.run(EvalVita.java:763)
> > ... 25 more
> >
> >
> > Below is the body of Eval.java:
> >
> > import com.model.*;
> >
> > public class Eval {
> >
> > static void loadModel() {
> >
> > try {
> > System.loadLibrary("model");
> >
> > System.out.println("Load library successfully");
> >
> > } catch (UnsatisfiedLinkError e) {
> >
> > System.err.println("Native code library failed to load." + e);
> >
> > }
> > }
> > public void run() {
> >
> > loadModel();
> > model.initModel();
> > }
> > }
> >
> >
> > Do I miss anything here? Any input is appreciated!
> >
> > Dennis
> >
>
