红帽企业Linux

Question

I installed jdk1.6.0_16 on enterprise linux 4 and I also set teh JAVA_HOME in my ~/.bash_profile

echo $JAVA_HOME correctly shows the new path of the java file

export JAVA_HOME=/jdk16/jdk1.6.0_16/bin/java

The bin directory is also int he path

However when I do java -version I still see java version "1.4.2"

How do I see newly installed jdk verion when i issue java -version command

Answer 1

whereis java

Type that in, and it will show you the locations java is kept.

Here is a page about it

Or execute the java binary directly using: /jdk16/jdk1.6.0_16/bin/java -version

Answer 2

In addition to what PostMan said, you should also modify your PATH envvar in the following way:

export PATH=$JAVA_HOME:$PATH

put this in your bash_profile. This will guarantee you pick up the 1.60 jdk. Also your JAVA_HOME should probably be;

JAVA_HOME=/jdk16/jdk1.6.0_16/bin

that is you shouldn't put the path to the actual java executable in JAVA_HOME. It should point to the java installs bin directory.

Answer 3

Executing

which java

will tell you which jvm's executable you're running when you just run java -version.

With multiple JVMs installed, it's best to fully specify the path or set your PATH environment variable appropriately.

Answer 4

$ vi ~/.bash_profile

--> Add

export JAVA_HOME=<path to java jdk>
export PATH=$JAVA_HOME:$PATH

--> write/save

Esc + : + w

--> quit editor

Esc + : + q