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Old 04-06-2006, 04:53 AM   #1
paul_mat
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Registered: Nov 2004
Location: Townsville, Australia
Distribution: Fedora Core 5, CentOS 4, RHEL 4
Posts: 855

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i'm lost with Java home


hi there, i'm trying to install a program with java ... i think

i'm running centOS and i have install java by yum

yum install java*

i'm pretty sure i have java this is what i get wheni run locate.

[root@centos html]# locate bin/java
/usr/sbin/javaconfig
/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre/bin/java
/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/bin/javadoc
/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/bin/java
/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/bin/javah
/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/bin/javac
/usr/bin/javadoc
/usr/bin/java
/usr/bin/javah
/usr/bin/javac

this is the command the readme tells me to run

[root@centos html]# java -jar VirusHammer.jar
Warning: -jar not understood. Ignoring.
Exception in thread "main" java.lang.NoClassDefFoundError: VirusHammer.jar
at gnu.gcj.runtime.FirstThread.run() (/usr/lib/libgcj.so.5.0.0)
at _Jv_ThreadRun(java.lang.Thread) (/usr/lib/libgcj.so.5.0.0)
at _Jv_RunMain(java.lang.Class, byte const, int, byte const, boolean) (/usr/lib/libgcj.so.5.0.0)
at __gcj_personality_v0 (/var/www/html/java.version=1.4.2)
at __libc_start_main (/lib/tls/libc-2.3.4.so)
at _Jv_RegisterClasses (/var/www/html/java.version=1.4.2)

this is what i get when I run which java

[root@centos html]# which java
/usr/bin/java

i'm run the following commands in the hope that it will fix it

[root@centos html]# export JAVA_HOME=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre/bin/java
[root@centos html]# echo $JAVA_HOME
/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre/bin/java

Still nothing, help me please ...
 
Old 04-06-2006, 05:14 AM   #2
timmeke
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Registered: Nov 2005
Location: Belgium
Distribution: Red Hat, Fedora
Posts: 1,515

Rep: Reputation: 61
Try executing:
Code:
java -?
to see what options your java program supports.

Also, $JAVA_HOME shouldn't point to the "java" program, but rather to the directory where you installed
the Java JDK or JRE.
In your case, set it as follows:
export JAVA_HOME=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre/.
 
Old 04-06-2006, 05:18 AM   #3
timmeke
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Registered: Nov 2005
Location: Belgium
Distribution: Red Hat, Fedora
Posts: 1,515

Rep: Reputation: 61
JAVA_HOME needs to point to a directory where you installed Java JDK or JRE, not to the "java" program.
So, $JAVA_HOME/bin/java is the location of the java program.

In other words, do:
Code:
export JAVA_HOME=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre/
if you only installed the jre.
Or
Code:
export JAVA_HOME=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/
if you have the full JDK.

Also, run
Code:
 java -?
to get a list of options for "java" and see if there's a "-jar" option.

And finally, as "which java" indicates, the /usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre/bin/java isn't used, but
/usr/bin/java instead.
Can you do an "ls -l /usr/bin/java " to see if it's a symbolic link to another program?
 
Old 04-06-2006, 05:37 AM   #4
paul_mat
Member
 
Registered: Nov 2004
Location: Townsville, Australia
Distribution: Fedora Core 5, CentOS 4, RHEL 4
Posts: 855

Original Poster
Rep: Reputation: 30
okay timmeke thanks all that information is very helpful.

using the command ls -l /usr/bin/java i found out that it is a like to the alternatives configuration and i've already set alternatives --config java.

i ran the command

Quote:
export JAVA_HOME=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre/
and tried to isntall my program

and

Quote:
export JAVA_HOME=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/
and tried to install it again

but each time i got the same error message
 
Old 04-06-2006, 09:05 AM   #5
timmeke
Senior Member
 
Registered: Nov 2005
Location: Belgium
Distribution: Red Hat, Fedora
Posts: 1,515

Rep: Reputation: 61
http://www.centos.org/modules/newbb/...=2475&forum=28
seems to deal with your problem.
 
  


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