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Old 11-17-2008, 05:54 PM   #1
ratcateme
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Registered: Feb 2008
Distribution: CentOS 5.4
Posts: 59

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Installing JDK6


I have been wanting to run some java scripts on my CLI Centos 5.0 box
i have been compiling them on windows using JDK6 when i ran one on my linux box it said the Class version was incompatible.
Code:
Exception in thread "main" java.lang.ClassFormatError: day (unrecognized class file version)
   at java.lang.VMClassLoader.defineClass(libgcj.so.7rh)
   at java.lang.ClassLoader.defineClass(libgcj.so.7rh)
   at java.security.SecureClassLoader.defineClass(libgcj.so.7rh)
   at java.net.URLClassLoader.findClass(libgcj.so.7rh)
   at gnu.gcj.runtime.SystemClassLoader.findClass(libgcj.so.7rh)
   at java.lang.ClassLoader.loadClass(libgcj.so.7rh)
   at java.lang.ClassLoader.loadClass(libgcj.so.7rh)
   at gnu.java.lang.MainThread.run(libgcj.so.7rh)
i ran java -version:
Code:
java version "1.4.2"
gij (GNU libgcj) version 4.1.2 20070626 (Red Hat 4.1.2-14)

Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
so only 1.4 i downloaded JDK6_10 installed it ran java -version and it was the same no change.
i ran javac -version and it said
Code:
javac 1.6.0_10
and i am sure java comes in JDK but i downloaded JRE6 install it but same results
i have restarted and no change.
what have i missed?
 
Old 11-17-2008, 07:44 PM   #2
ratcateme
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Registered: Feb 2008
Distribution: CentOS 5.4
Posts: 59

Original Poster
Rep: Reputation: 15
i did some more testing and tried to install all the rpms manually like this
Code:
[root@ratcat javarpms]# ls -l
total 94088
-rw-r--r-- 1 root root 66455505 Nov 18 13:40 jdk-6u10-linux-i586.rpm
-rw-r--r-- 1 root root 19807285 Nov 18 13:40 jre-6u10-linux-i586.rpm
-rw-r--r-- 1 root root   482972 Nov 18 13:40 sun-javadb-client-10.4.1-3.1.i386.rpm
-rw-r--r-- 1 root root    34007 Nov 18 13:40 sun-javadb-common-10.4.1-3.1.i386.rpm
-rw-r--r-- 1 root root  3771833 Nov 18 13:40 sun-javadb-core-10.4.1-3.1.i386.rpm
-rw-r--r-- 1 root root   918250 Nov 18 13:40 sun-javadb-demo-10.4.1-3.1.i386.rpm
-rw-r--r-- 1 root root  4558557 Nov 18 13:40 sun-javadb-docs-10.4.1-3.1.i386.rpm
-rw-r--r-- 1 root root   182834 Nov 18 13:40 sun-javadb-javadoc-10.4.1-3.1.i386.rpm
[root@ratcat javarpms]# rpm -i *
        package sun-javadb-common-10.4.1-3.1 is already installed
        package jdk-1.6.0_10-fcs is already installed
        package jre-1.6.0_10-fcs is already installed
        package sun-javadb-client-10.4.1-3.1 is already installed
        package sun-javadb-core-10.4.1-3.1 is already installed
        package sun-javadb-demo-10.4.1-3.1 is already installed
        package sun-javadb-docs-10.4.1-3.1 is already installed
        package sun-javadb-javadoc-10.4.1-3.1 is already installed
[root@ratcat javarpms]# rpm -e *
error: package jdk-6u10-linux-i586.rpm is not installed
error: package jre-6u10-linux-i586.rpm is not installed
error: package sun-javadb-client-10.4.1-3.1.i386.rpm is not installed
error: package sun-javadb-common-10.4.1-3.1.i386.rpm is not installed
error: package sun-javadb-core-10.4.1-3.1.i386.rpm is not installed
error: package sun-javadb-demo-10.4.1-3.1.i386.rpm is not installed
error: package sun-javadb-docs-10.4.1-3.1.i386.rpm is not installed
error: package sun-javadb-javadoc-10.4.1-3.1.i386.rpm is not installed
[root@ratcat javarpms]# rpm -i *
s       package sun-javadb-common-10.4.1-3.1 is already installed
        package jdk-1.6.0_10-fcs is already installed
        package jre-1.6.0_10-fcs is already installed
        package sun-javadb-client-10.4.1-3.1 is already installed
        package sun-javadb-core-10.4.1-3.1 is already installed
        package sun-javadb-demo-10.4.1-3.1 is already installed
        package sun-javadb-docs-10.4.1-3.1 is already installed
        package sun-javadb-javadoc-10.4.1-3.1 is already installed
as you can see they are all there and when you try to remove them then are not installed but if you try to install them they are installed ?????????????

Scott.
 
Old 11-18-2008, 11:06 PM   #3
reddazz
LQ Guru
 
Registered: Nov 2003
Location: N. E. England
Distribution: Fedora, CentOS, Debian
Posts: 16,298

Rep: Reputation: 75
You need to change your default java using the update-alternatives command e.g.
Code:
update-alternatives --config java
There are other options available so take a look at the update-alternatives manual.
 
Old 11-19-2008, 03:59 AM   #4
ratcateme
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Registered: Feb 2008
Distribution: CentOS 5.4
Posts: 59

Original Poster
Rep: Reputation: 15
thanks for the reply but i ended up renaming the binary in /usr/bin
and symbolic linking the 1.6 binary from /usr/java/jdk1.6.0_10/bin/

Scott.
 
  


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