.Jar file execution error on FC7

immortaltechnique · 12-20-2007, 05:40 AM

Hallo all,

Am having abit of a problem executin a client sided of a Cafe software:

when i run the server side of the software using ./Cafepilot_Server.jar, it executes perfectly.

now when i try to do the same for the client side i get the following error:

Code:

invalid file (bad magic number): Exec format error

So i figured out i could use java -jar Cafepilot_client.jar, but that annoingly throws up the following errors:

Code:

Exception in thread "main" java.lang.NoClassDefFoundError: sun.misc.BASE64Decoder
   at com.dijitanix.cafepilot.cafepilotclient.gb.b(gb.java)
   at com.dijitanix.cafepilot.cafepilotclient.Main.main(Main.java)

I also try java cafepilot_Client.jar and i get even more errors:

Code:

Exception in thread "main" java.lang.NoClassDefFoundError: CafePilot_Client.jar
   at gnu.java.lang.MainThread.run(libgcj.so.8rh)
Caused by: java.lang.ClassNotFoundException: CafePilot_Client.jar not found in gnu.gcj.runtime.SystemClassLoader{urls=[file:./], parent=gnu.gcj.runtime.ExtensionClassLoader{urls=[], parent=null}}
   at java.net.URLClassLoader.findClass(libgcj.so.8rh)
   at gnu.gcj.runtime.SystemClassLoader.findClass(libgcj.so.8rh)
   at java.lang.ClassLoader.loadClass(libgcj.so.8rh)
   at java.lang.ClassLoader.loadClass(libgcj.so.8rh)
   at gnu.java.lang.MainThread.run(libgcj.so.8rh)

what might the issue be. Am running on FC7

reddazz · 12-20-2007, 05:53 AM

It could be that you are usng gcj which ships with Fedora by default. I would suggest you try Sun java and this article will help you with that.

immortaltechnique · 12-21-2007, 12:09 AM

Thanks alot redazz for you response. I installed Sun Jdk but i still get the same error.

Any more ideas? I simply cant understand why the server is working perfectly yet the client is generating all these error.

reddazz · 12-21-2007, 12:45 AM

If its exactly the same error, then its still the issue about gcj. Did you run the alternatives command to switch the default java?

jay73 · 12-21-2007, 12:51 AM

NoClassDefErrors typically arise when the binary can't be found by the JVM. Did you get the path right?

immortaltechnique · 12-21-2007, 01:16 AM

Yes i ran the alternative commands but it dint work unless i missed one. Kindly forward me any alternatives.

As for the Paths how do i define the paths? Is this done during executing time or when is it done.

And is there a way to fix the gjc error?

Thanks alot for taking the time to help.

jay73 · 12-21-2007, 04:26 AM

If you want to install the sun jdk on Fedora without too many issues, you should use jpackage.org to install the java-compat package, then install the jdk. There are some conflicts between Fedora and jpackage, though, so you need to be careful if you use if for other java packages too. Having the compat package makes running alternatives a lot more straightforward. It essentially creates all the links that a pre-installed environment like gcj already has.

You can also install galternatives, which is an alternatives GUI. Again more straightforward, you just need to check the proper items.

As for the path, that could mean various things. First of all, you need to make sure that you are in the right directory before you execute java -jar. It is also possible that the jar file needs to be appended to your classpath in /etc/profile or your .bash_profile, something like this:

Quote:

export JMF_HOME=/opt/jmf/JMF-2.1.1e
export JAVA_HOME=/usr/java/jdk1.6.0_03
export J2RE_HOME=/usr/java/jdk1.6.0_03/jre
export JAVAMP3_HOME=/opt/javamp3-1_0
#export JAVA_HOME=/opt/jdk1.6.0_03
#export J2RE_HOME=/opt/jdk1.6.0_03/jre
export JAI_HOME=/opt/jai
export JAI_IMAGEIO_HOME=/opt/jai_imageio-1_1
export JOGL_HOME=/opt/jogl
export JAVA_BIN=$JAVA_HOME/bin
export JDIC_HOME=/opt/jdic
export CLASSPATH=$JMF_HOME/lib/jmf.jar:$JMF_HOME/lib/fobs4jmf.jar:$JMF_HOME/lib/sound.jar:$JAVAMP3_HOME/lib/mp3plugin.jar:/opt/MPEG4VideoDecoderEval.zip:.:$JAVA_HOME:$JAVA_HOME/lib:
$JAI_HOME/lib/ext/jai_codec.jar:$JAI_HOME/lib/ext/jai_core.jar:$JAI_HOME/lib/ext/mlibwrapper_jai.jar:$JAI_IMAGEIO_HOME/lib/jai_imageio.jar:$JAI_IMAGEIO_HOME/lib/clibwrapper_jiio.jar:$JOGL_HOME/lib/jogl.jar:$JOGL_HOME/lib/gluegen-rt.jar:$JDIC_HOME/jdic.jar
export PATH=$JAVA_BIN:$PATH:$HOME/bin

LD_LIBRARY_PATH=$JMF_HOME/lib:$JAI_HOME/lib/i386:$JAI_IMAGEIO_HOME/lib:$JOGL_HOME/lib:$LD_LIBRARY_PATH; export LD_LIBRARY_PATH

This one has many more items than you need but I guess you can get the idea.