JNI Problem

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9GB - 07 Jul 2007 19:01 GMT

Well, I am having a little trouble compiling my file and generating
header files through it. I am loading a DLL file in Test1.java and
then I compile it this way and get the following message:

javac Test1
javah -jni Test1
error: cannot access Test1
file Test1.class not found
javadoc: error - Class Test1 not found.
Error: No classes were specified on the command line. Try -help.

Can anybody tell me whats the problem with this?

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Gordon Beaton - 07 Jul 2007 19:16 GMT

> javac Test1
> javah -jni Test1
> error: cannot access Test1
> file Test1.class not found
> javadoc: error - Class Test1 not found.
> Error: No classes were specified on the command line. Try -help.

Try specifying -classpath when you run javah (and apparently javadoc).

It isn't necessary to specify -jni.

/gordon

--

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9GB - 07 Jul 2007 19:30 GMT

I added classpath to it, and now I get this message:
C:\R>javah -classpath C:\R InvokeMasterCom
error: cannot access InvokeMasterCom
bad class file: C:\R\InvokeMasterCom.class
class file contains wrong class: RegistrationSystem.InvokeMasterCom
Please remove or make sure it appears in the correct subdirectory of
the classpa
th.
com.sun.tools.javac.util.Abort
at com.sun.tools.javac.comp.Check.completionError(Check.java:
169)
at com.sun.tools.javadoc.DocEnv.loadClass(DocEnv.java:149)
at com.sun.tools.javadoc.RootDocImpl.<init>(RootDocImpl.java:
77)
at
com.sun.tools.javadoc.JavadocTool.getRootDocImpl(JavadocTool.java:156
)
at com.sun.tools.javadoc.Start.parseAndExecute(Start.java:330)
at com.sun.tools.javadoc.Start.begin(Start.java:128)
at com.sun.tools.javadoc.Main.execute(Main.java:66)
at com.sun.tools.javah.Main.main(Main.java:147)
javadoc: error - fatal error
2 errors

> > javac Test1
> > javah -jni Test1
[quoted text clipped - 10 lines]
>
> --

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9GB - 07 Jul 2007 19:31 GMT

Oops! sorry, its fixed now...
Thanks :)

> I added classpath to it, and now I get this message:
> C:\R>javah -classpath C:\R InvokeMasterCom
[quoted text clipped - 34 lines]
>
> > --

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9GB - 07 Jul 2007 19:32 GMT

But anyway, just a question, why do we explicitly have to specify the
classpath for it?

> I added classpath to it, and now I get this message:
> C:\R>javah -classpath C:\R InvokeMasterCom
[quoted text clipped - 34 lines]
>
> > --

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Gordon Beaton - 07 Jul 2007 20:13 GMT

> But anyway, just a question, why do we explicitly have to specify the
> classpath for it?

Because the argument to javah, java and many other tools in the JDK,
is a classname, not a filename. You need to tell it how to resolve the
classname in order to find the file.

/gordon

--

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Roedy Green - 08 Jul 2007 18:28 GMT

>Well, I am having a little trouble compiling my file and generating
>header files through it. I am loading a DLL file in Test1.java and
>then I compile it this way and get the following message:

You can do it with ANT. See a sample ant script at
http://mindprod.com/products.html#FILETIMES
--
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com

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