How to know, which java version is the default

[Michael Schulte zur Sur]

Hi,
I have java118 and java122 installed on Tru Unix 5.1A. How can I check, what is the default and how can I change it?
thanks for any insight
Michael

[Dave Bechtold · Accepted solution]

Hi Michael,

To check it use.

# java -version


To change the default use.

Assuming 1.1.8 is the default currently.

This will first unset the current default of 1.1.8.

# /usr/opt/java118/bin/unset_java_default.sh

Now set 1.2.2 as the default use.

# /usr/opt/java122/bin/set_java_default.sh

Then recheck it.

# java -version


There is a unset_java_default.sh and a set_java_default.sh for versions 1.1.8 and higher under the /usr/opt/javaNNN/bin directory, where NNN is the major release number, i.e. 118, 122, 131. The scripts just change a symbolic link for /usr/bin/java .

FYI, this is documented in the release notes.

Hope this helps.

Dave Bechtold

[Michael Schulte zur Sur]

Thanks Dave,

this is a precise and clear answer.
ehem, I somewhat have an allergy against documentaion. ;-))
One thing though, 118 and 122 are installed.
Why is 118 the default and not the 122?
Usually you take the newest, right?

Michael

[Michael Schulte zur Sur]

Hello Dave,

forget my last question. I found the release notes. ;-)

Michael

[Ralf Puchner]

reading is always an option ;-)

[Michael Schulte zur Sur]

That??s true, Ralf.
Unfortunately I have read often docs in search for and answer to a question and I found none, that I developped a dislike for it. :-(
So I try, whenever possible to go without.
best regards
Michael

[Thomas Sjolshagen]

V1.1.8 is the default because several OS components (sysman and lsmsa for instance) would have needed to be re-written to support V1.2.x.

As of V5.1b, V1.3.1 (fastvm) is the default jvm and the OS utilities that require V1.1.8 have been modified.

hth,

// Thomas

[Abhijeet_4]

Michael ,
However java -version doesnot give information about service release .
How to get info about service release

Best Regards
abhijeet