Re: JNI error under tomcat: java.lang.UnsatisfiedLinkError
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
> 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 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
> >
>
Re: JNI error under tomcat: java.lang.UnsatisfiedLinkError
Ralph,
I got this error upon first deployment...
2010/7/4 Ralph Carlson
> do you get this error upon first deployment or re-deploy?
> do you restart tomcat after you redeploy your jni app?
>
> From:
> users-return-214329-racarlson=mediacomcc@tomcat.apache.org[users-return-214329-racarlson=
> mediacomcc@tomcat.apache.org] On Behalf Of Shay Rojansky [
> r...@roji.org]
> Sent: Saturday, July 03, 2010 12:40 AM
> To: Tomcat Users List
> Subject: Re: JNI error under tomcat: java.lang.UnsatisfiedLinkError
>
> 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 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)
> >
Re: JNI error under tomcat: java.lang.UnsatisfiedLinkError
Hi Chris,
Thanks for your reply. I recompiled everything and checked method
signature, but still got the same error. I felt it's weird why it worked
for standalone app but not deployed web service... Thanks.
model.java
public static void initModel() {
modelJNI.initModel();
}
modelJNI.java
===
public final static native void initModel();
native code
=
#include
#include
#include
string path="/tmp/model.xml";
HEC *hec_obj;
void initModel() {
hec_obj = new HEC(path);
if (!hec_obj) {
cout << "[ERROR] Cannot instantiate HEC objects.";
}
}
2010/7/3 Christopher Schultz
> -BEGIN PGP SIGNED MESSAGE-
> Hash: SHA1
>
> Dennis,
>
> On 7/2/2010 3:46 AM, dennis ch wrote:
> > 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
>
> [...]
>
> > 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
>
> Sounds like a Java-class/native-library mismatch. Are you sure your
> .java file and .c files are sync'd up properly? Try recompiling
> everything, and double-check your JNI method signatures.
>
> What does modelJNI.initModel look like in the Java method declaration?
> What does the same method signature in your native code look like?
>
> - -chris
> -BEGIN PGP SIGNATURE-
> Version: GnuPG v1.4.10 (MingW32)
> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
>
> iEYEARECAAYFAkwv82YACgkQ9CaO5/Lv0PABewCeIC0qjqJdNm80GMByJBJn4VEs
> KzsAoKDPzdgXUJKMq/S4xruHd0RlNJCv
> =VA0U
> -END PGP SIGNATURE-
>
> -
> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
> For additional commands, e-mail: users-h...@tomcat.apache.org
>
>
JNI error under tomcat: java.lang.UnsatisfiedLinkError
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
