Hi, Jeff.
Thank you so much for responding to my question.
Perhaps I'm getting confused by the jargon. The "SolverLibrary" that I
wrote is written in C/C++ and compiled by Visual Studio into a DLL.
This DLL is supposed to be run only on the server. The GWT code was
written in Eclipse and follows essentially the documentation on the
GWT web site. At the moment, the C/C++ DLL is only checking whether a
username and password sent it by the client exists within a file on
the server (nothing fancy; there is no reason to do this in C/C++
other than to see if it will work) though I have plans to make much
more complicated native functions once I get this to work. I am not
sure where the "classpath" is. There is an environment variable in
Windows called the "PATH"; is that what you mean? I do call the
library via RPC. The calling code is as follows (written in Java in
Eclipse using GWT):
public class SecurityServiceImpl extends RemoteServiceServlet
implements SecurityService {
private static NativeCodeClass nativeCode=new NativeCodeClass();
private CompressClass compression=new CompressClass();
@Override
public CompressedMessage validatePassword(CompressedMessage m) {
String message=compression.Decompress(m);
String username=message.substring(0,message.indexOf(','));
String password=message.substring(message.indexOf(',')
+1,message.length());
String returnString=nativeCode.validatePassword(username,
password);
CompressedMessage
replyMessage=compression.Compress(returnString);
return replyMessage;
}
}
Again, thanks for your help. Any other suggestions would be welcome.
Best, Darin
On Nov 3, 7:27 am, Jeff Chimene <[email protected]> wrote:
> Darin:
>
> There is one other possibility. You mention that you "... tested the
> compiled code (including the native
> code) inside the Mozilla browser and it also runs as it should."
>
> What's happening is that the Java run-time is able to load and run your
> library in hosted mode. But, that doesn't mean that you can compile this
> library to Javascript. Try putting the library into the classpath, modify
> your code to instantiate whatever classes you need, and compile (rather than
> run in hosted mode). You cannot use LoadLibrary on the client side: there is
> no Java runtime.
>
> On Mon, Nov 2, 2009 at 4:37 PM, Darin <[email protected]> wrote:
>
> > Hello.
>
> > I have written a GWT project that uses native code. The class that
> > calls the code looks like this:
>
> > public class NativeCodeClass {
> > static {
> > System.loadLibrary("SolverLibrary");
> > }
> > public native String validatePassword(String username, String
> > password);
> > }
>
> > When I compile and run this inside of Eclipse (hosted mode), the
> > native code runs (assuming that I uncheck the "Use Google App Engine")
> > just fine. I have also tested the compiled code (including the native
> > code) inside the Mozilla browser and it also runs as it should.
> > Unfortunately, when I deploy my code to the server, the Javascript
> > does not seem to be able to find my native library (SolverLibrary)
> > even though the Javascript is definitely working. I have tried copying
> > the library to every conceivable location that I could think of but
> > have thus far failed. I am running Windows XP and using Apache as my
> > http server. Any ideas for where I should put the native library so
> > that the Javascript can find it?
>
> > Disclaimer: I am a definite newbie with GWT and a mathematician by
> > trade. If I am doing something outrageously stupid, I apologize for
> > wasting everyone's time, but please let me know what I'm doing wrong
> > so that I don't wind up smashing my computer and scaring my son.
> > Thanks, Darin
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