Installing JDK6

ratcateme · 11-17-2008, 04:54 PM

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?

ratcateme · 11-17-2008, 06:44 PM

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.

reddazz · 11-18-2008, 10:06 PM

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.

ratcateme · 11-19-2008, 02:59 AM

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.