Re: Java and Eclipse

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Date: Mon, 21 Nov 2005 11:20:16 GMT

Joseph wrote:

> Got Fedora 4 installed and then installed a better version of Java (big
> mistake). Now Eclipse dos not work and come with error message in
> "/root/workspace/.metadata/.log". the message saying it can not find Java
> or the link dos not exist. Well, I have searched for Java on the root and
> up and got back tons of Java, Java files and directory that makes me very
> confused to how to un-install and re-install a software under Linux. I
> tried to go to add/remove program and tried to remove java so I can
> re-install it but give me an error and it seem like it can not handle
> removing something that is maybe missing.
>
> If any one of you can help me figure this out without having to re-install
> Linux again that would be truly appreciated.

Reconfiguring Fedora Core 4's default Java configuration

This is done as root or equivalent.

First remove /var/lib/alternatives/java file by typing;

rm /var/lib/alternatives/java

When asked press the 'y' key,

Now to create the new (corrected) alternatives file for java type
the following example commands as root (the first two lines are each one
long line with a space after the first line and the rest of the command);

/usr/sbin/alternatives --install /usr/bin/java
java /usr/lib/jvm/jre-1.4.2-gcj/bin/java 1

/usr/sbin/alternatives --install /usr/bin/java
java /usr/java/j2re1.5.0_05/bin/java 2

/usr/sbin/alternatives --config java

You should now see for example:

There are 2 programs which provide 'java'.

  Selection Command
-----------------------------------------------
   1 /usr/lib/jvm/jre-1.4.2-gcj/bin/java
*+ 2 /usr/java/j2re1.5.0_05/bin/java

Enter to keep the current selection[+], or type selection number:

Type: <choose 1 or 2>

In the example above java is already configured [*+ 2] to use Sun's Java, no
changes are needed, just press the Enter key here.

If you have been following the instructions then you should have
the same results (version numbers may be sightly different).

Now type; /usr/sbin/alternatives --display java

You should see for example;

java - status is manual.
link currently points to /usr/java/j2re1.5.0_04/bin/java
/usr/lib/jvm/jre-1.4.2-gcj/bin/java - priority 1
/usr/java/j2re1.5.0_05/bin/java - priority 2
Current `best' version is /usr/java/j2re1.5.0_05/bin/java.

Next you might want to create (or edit) /etc/profile.d/java.sh
file, example below;

export JAVA_HOME="/usr/java/jre1.5.0_05/bin"
export JAVA_PATH="$JAVA_HOME"
export PATH="$PATH:$JAVA_HOME"

When done creating or editing the file type;

source /etc/profile.d/java.sh

Now any user root or other wise should be able to use the command;

which java

and the results should read something like;

/usr/java/jre1.5.0_05/bin/java

Also any user root or otherwise should be able to use the command;

java -version

and the results should read something like;

java version "1.5.0_05"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_05-b05)
Java HotSpot(TM) Client VM (build 1.5.0_04-b05, mixed mode, sharing)

That's it, all done.

-- 
"They that can give up essential liberty to obtain a little temporary
 safety deserve neither liberty nor safety."     -- B. Franklin, 1759

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