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Date:	Thu, 05 Jun 2003 14:36:10 -0700
To:	"Thomas X. Hoban" <thoban AT verbalogic DOT com>, <cygwin AT cygwin DOT com>
From:	Alan Thompson <athompson AT alphatech DOT com>
Subject:	Re: Linking with JNI Invoke Using Cygwin gcc
In-Reply-To:	<DLEPIMCBMLJEPMIPNAEDOEFOCAAA.thoban@verbalogic.com>
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Hi Tom - There is a quirk when using the JNI Invocation API on Cygwin (non-invocation JNI works as expected).  The solution is documented nicely at the excellent JNI-on-Cygwin webpage:  http://www.inonit.com/cygwin/.  You can also download some sample JNI code, including both invocation- and non-invocation-code at http://www.whitecaps.net/jni/expr.jar.

Alan Thompson


At 04:21 PM 6/5/2003 -0500, Thomas X. Hoban wrote:

>I have written a DLL and a test program that uses the JNI api to invoke a
>JVM.  When I try to link with a test program, I get an error indicating that
>a reference to __imp__JNI_CreateJavaVM AT 12 is undefined.
>
>$ export JAVA_HOME=/cygdrive/c/j2sdk1.4.1_02
>$ g++ -c ­I$JAVA_HOME/include ­I$JAVA_HOME/include/win32 JavaGateway.c++
>$ g++ -I$JAVA_HOME/include ­I$JAVA_HOME/include/win32 ­L$JAVA_HOME/lib \
>-ljvm JavaGateway.o -o testGateway testGateway.c++
>
>The link command above produces these errors:
>
>JavaGateway.o(.text+0x171):JavaGateway.c++: undefined reference to
>`__imp__JNI_CreateJavaVM AT 12'
>JavaGateway.o(.text+0x251):JavaGateway.c++: undefined reference to
>`__imp__JNI_CreateJavaVM AT 12'
>collect2: ld returned 1 exit status
>
>I assume that the jvm.lib file provided with the sdk was compiled with MS
>VC++.  Does the cygwin gcc compiler massage the symbol references
>differently from MS?  Does anyone have a suggestion on how I can make this
>work?
>
>Thanks,
>
>Tom



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