On Fri, Nov 19, 1999 at 06:44:48PM -0500, Jacob Nikom wrote:
> I am writing JNI application called MainPanel using Java, C++ and
> a bit of C. It compiles and links without problem, but when I run
> it, it crushes with the message...
My guess is that you linked your shared library using gcc instead of
g++, and so it lacks a reference to the C++ library that defines
cout. If you run "ldd" on the shared library and you see no reference
to a library named libstdc++, that's the culprit. Try linking your
.so with g++.
> I always thought all symbols should be found (resolved) during the
> linking stage. If there is no complains from the linker, there should
> not be any complains during runtime. Looks like it is not so, but why?
I don't believe the linker complains about unresolved references in
shared libraries. The rationale, I guess, is that the missing piece will
come from the application or some other shared library.
Nathan
On Fri, Nov 19, 1999 at 06:44:48PM -0500, Jacob Nikom wrote:
> Hi,
>
> I am writing JNI application called MainPanel using Java, C++ and
> a bit of C. It compiles and links without problem, but when I run
> it, it crushes with the message:
>
> prompt>java -green MainPanel pixelbuf
> Exception in thread "main" java.lang.UnsatisfiedLinkError:
> /homes/nikom/work/libStereoImageTransform.so:
> undefined symbol: cout
> at java.lang.ClassLoader$NativeLibrary.load(Native Method)
> at java.lang.ClassLoader.loadLibrary0(Compiled Code)
> at java.lang.ClassLoader.loadLibrary(Compiled Code)
> at java.lang.Runtime.loadLibrary0(Compiled Code)
> at java.lang.System.loadLibrary(Compiled Code)
> at MainPanel.<clinit>(MainPanel.java:13)
> make: *** [go] Error 1
>
> Here is the code of MainPanel.java:
>
> 1 import java.awt.*;
> 2 import java.awt.event.*;
> 3 import javax.swing.*;
> 4
> 5 class MainPanel extends JPanel
> 6 {
> 7
> 8 public static synchronized native void
> 9 ImageTransform(int[] x1Array, int[] y1Array, int[]
> x2Array, int[] y2Array);
> 10
> 11 static
> 12 {
> --> 13 System.loadLibrary("StereoImageTransform");
> 14 }
> 15
> 16 static ImagePanel imagePanel;
> 17
> ......................................................
>
> The structure of this JNI application is very simple:
>
> +------------+
> | Java code |
> +------------+
> | ^
> v |
> +------------+
> | C wrapper |
> +------------+
> | ^
> v |
> +------------+
> | C++ code |
> +------------+
>
> I always thought all symbols should be found (resolved) during the
> linking stage. If there is no complains from the linker, there should
> not be any complains during runtime. Looks like it is not so, but why?
> Do you have any suggestions how to fix or investigate the problem?
>
> Thank you,
>
> Jacob Nikom
>
>
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