Re: [Jmagick-users] Exception in thread "main" java.lang.NullPointerException(sample application fails)

[Jacob N. <jac...@gm...>]

2008/7/1 Jayesh S <Jay...@mi...>:

>  Hi All,
>
>
>
> We have installed ImageMAgick 6.2.5 and JMagick 6.2.4-1 in our server box.
> The server OS is RHEL4.6(RHEL 4 with Nahant update 6).
>
> After the installation when we tried to run the standalone sample test
> program(in src/test/Test.java) using* make test* it's  throwingthe
> following error.
> LD_LIBRARY_PATH=/usr/local/lib:../../lib:
> DYLD_LIBRARY_PATH=/usr/local/lib:../../lib: /usr/bin/java -classpath
> /usr/src/JMagick/JMagick-6.2.6-0/classes test.Test
> Scaled to 60x30
> Depth 8
> Exception in thread "main" java.lang.NullPointerException
>    at _Jv_NewStringUTF (/usr/lib/libgcj.so.5.0.0)
>    at throwMagickApiException (/usr/local/lib/libJMagick.so)
>    at Java_magick_MagickImage_readImage (/usr/local/lib/libJMagick.so)
>    at _Jv_JNIMethod.call(ffi_cif, void, ffi_raw, void)
> (/usr/lib/libgcj.so.5.0.0)
>    at magick.MagickImage.MagickImage(magick.ImageInfo) (Unknown Source)
>    at test.Test.main(java.lang.String[]) (Unknown Source)
> make: *** [test] Error 1
>
> ***********
>
This must come from the line
            MagickImage image = new MagickImage(info);

calling the C code
    image = ReadImage(imageInfo, &exception);
    if (image == NULL) {
        throwMagickApiException(env, "Unable to read image", &exception);

... which means you cant read an image at all.

I see you use GCJ, which I have never tried.

Have you tried with Sun JDK, to see if it makes a difference?


-- 
Jacob Nordfalk
http://javabog.dk
Skype: jacobnordfalk