Downgrading Java 1.6 to Java 1.4
 

Hi all

I need to downgrade my java version from 1.6 to 1.4 for some reasons (trust me , it's necessary) so , can someone provide me some info how i can do this most efficient?

It's not needed to REMOVE java 1.6, i just need to download and install 1.4 and use it.
Can someone help me?

thanks in advance

Check /usr/lib/java* to see what is there. It is possible you already have 1.4 along with 1.6 (and maybe even 1.5) but your default is the 1.6. If so you just need to insure the path to java you're using for the specific app that has the 1.4 requirement is using the 1.4 version. (I wouldn't change the default.) We've had to do this often for various Oracle BS apps. (Of course Java was a Sun product so Oracle now owns Java too.)

If you are on CentOS/RHEL you can do "yum list java*" which will show you what Java is available and what you have installed. If it is in the repository you can use "yum install <version>" to install the Java from the repository. (Where version is one of the packages identified in the list.)

If you can't find the one you want there you should be able to download it from Oracle. I used to go to sun.java.com but that redirected me to new link this morning:
http://www.oracle.com/technetwork/java/index.html

Navigating from there I got to this page:

On that somewhat confusing page it appears you'd want to select the download next to "J2SDK/J2RE - 1.4"
http://www.oracle.com/technetwork/ja...ve-139210.html

Is it really necessary?
Will it not be sufficient to make the java compiler think it's 1.4?

will compile Java code as if you were using the specified version. If you are using an IDE you set compiler options, e.g. in Eclipse use Window > Preferences > Java > Compiler and set the Compiler compliance level to 1.4.

The folder u said, there are folders for version 1.4.0, 1.4.1, 1.4.2, .... but there is nothing in it (strange) but i've installed the version 1.4 already and it's indeed not the purpose to use 1.4 all the time, i just needed it for this script only

so i do
/path/to/folder/bin/java .......

thanks ;)

hmm, on my other server it ain't working...
MensaWater, when i download java 1.4.<version> and when i try to install the .bin package, he says that file is corrupted... :confused: how's that??

downloaded 1.4.19 and it works ;) so never mind

Although I pointed to the JDK I don't know that the OP was trying to "compile" anything. He likely was trying to run an app that was complaining about the later 1.6 java runtime.