Java is not installed unix issue

Question

I am on Linux Centos 6.

I've installed Java JRE and JDK on my machine.

[root@mhsapp002 conf]# java -version
java version "1.7.0_60"
Java(TM) SE Runtime Environment (build 1.7.0_60-b19)
Java HotSpot(TM) 64-Bit Server VM (build 24.60-b09, mixed mode)


[root@mhsapp002 conf]# javac -version
javac 1.7.0_55

Also, I've manually set JAVA_HOME in .bash_profile file.

PATH=$PATH:$HOME/bin
export PATH
export JAVA_HOME=/opt/java/jre1.7.0_60
export PATH=/opt/java/jre1.7.0_60/bin:$PATH


[root@mhsapp002 conf]# echo $JAVA_HOME
/opt/java/jre1.7.0_60

Also, I've tried set both options in using alternatives.

[root@mhsapp002 conf]# alternatives --config java

There are 2 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
   1           /opt/java/jre1.7.0_60/bin/java
*+ 2           /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java



[root@mhsapp002 conf]# readlink -f $(which java)
/opt/java/jre1.7.0_60/bin/java

Now I am trying to install datastax opscenter-agent which requires java on the machine. But it fails with following error:

Some agent installations failed:

- 127.0.0.1: Failure installing agent on 127.0.0.1.
Standard output:
Unable to find a java executable!
Please install java or set JAVA_HOME.

Exit code: 4

Do you have any ideas or suggestions for what reason it is fails? Thanks for any help!

@NickJ, I've installed JDK by running following command: `yum install java-1.7.0-openjdk-devel` Is it safe to assume that I've installed full JDK? `java` and `javac` cmds works fine. — Wild Goat, Jun 10 '14 at 12:37
@طاهر, I've tried both selections using alternatives. No luck! — Wild Goat, Jun 10 '14 at 13:00
i think it is a Centos bug see http://unix.stackexchange.com/questions/77290/alternatives-not-working-well-for-java-installation-on-centos-6-4 — Farvardin, Jun 10 '14 at 13:05
Just a wild guess but try with Oracle JDK instead of openjdk. — predi, Jun 10 '14 at 13:15
Post the output of `readlink -f $(which java)` . This the java CentOS is using. — bsd, Jun 10 '14 at 13:19

score 6 · Answer 1 · answered Jun 11 '14 at 21:58

There is a problem with provisioning OpsCenter Agents on Centos 6.5. It should be fixed in upcoming patch releases of Datastax OpsCenter.

If you’re installing agents on the existing Cassandra cluster, there’s a workaround: try installing and starting agents manually (via yum and service, accordingly).

Java is not installed unix issue

1 Answers1