CODEWITHSUNDEEP
javalinuxoracle-databasecentosrpm
dataquerent
dataquerent

Reputation: 267

I had Open JDK 1.7 on CentOS; I installed Oracle's Java rpm; Oracle Java doesn't seem to exist

I started off with CentOS and OpenJDK 1.7

# java -version
java version "1.7.0_25"
OpenJDK Runtime Environment (rhel-2.3.10.4.el6_4-x86_64)
OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)

In order to run a specific application, I want to use Oracle's Java 1.6, provided from an RPM.

I copied the Oracle binary to a specific new directory:

# pwd
/oracleJava/jdk-6u45-linux-x64-rpm

I extracted the binary and it gave me the following files:

# ls
jdk-6u45-linux-amd64.rpm               
sun-javadb-core-10.6.2-1.1.i386.rpm  sun-javadb-javadoc-10.6.2-1.1.i386.rpm
sun-javadb-client-10.6.2-1.1.i386.rpm  sun-javadb-demo-10.6.2-1.1.i386.rpm
sun-javadb-common-10.6.2-1.1.i386.rpm  sun-javadb-docs-10.6.2-1.1.i386.rpm

I installed the RPM and the rpm utility believes that it installed properly: rpm -q jdk jdk-1.6.0_45-fcs.x86_64

# rpm -Uvh ./*.rpm
Preparing...                ########################################### [100%]
    package jdk-2000:1.6.0_45-fcs.x86_64 is already installed
# rpm -Uvh sun-javadb-*.rpm
 [I omit the feedback because it generates a formatting error]
#

However, the Java version just shows 1.7 # java -version java version "1.7.0_25" OpenJDK Runtime Environment (rhel-2.3.10.4.el6_4-x86_64) OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)

In other words, I was expecting the Oracle files to give me some new /java directory somewhere, with a new java executable that would return a different answer for "java -version"

I need that new directory so that I can set JAVA_HOME and use the 1.6 version of Java.

Helpful suggestions would be greatly appreciated. Thanks in advance.

Upvotes: 4

Views: 17357

Answers (5)

Stephen C
Stephen C

Reputation: 719436

The problem is that Oracle's RPMs are (wilfully IMO!) ignorant of the "alternatives" system.

Instead, they install stuff in a non-standard place (/usr/java) and then expect the user / system administrator to mess with the PATH variable ... by hand.

It is a nuisance!

So what has probably happened in your case is that your JDK / JRE has been installed in a subdirectory of /usr/java ... but since you haven't added the relevant bin subdirectory to the front of your PATH you are still picking up the OpenJDK tools via the java command name.

You can fix this after the fact by using "alternatives" to configure and then select the Oracle commands. But it is messy, especially if you want the JDK tools as well. (There are a lot of them!)

Upvotes: 1

Matrix
Matrix

Reputation: 11

Try to the following method

delete OpenJDK folder from

/usr/lib/jvm

I had same problem and got solution through this method

Upvotes: 0

bryn
bryn

Reputation: 3325

The Oracle JDK RPMs are horrible.

  • They do not register with the alternatives system.
  • They do not Provide (in RPM terms) "java"
  • They have messed up their RPM 'version string' and rely on Epoch (...)
  • All versions of the JDK (i.e. 1.6 vs 1.7) have the same Epoch

In order to quickly remedy your problem you can run the following:

/usr/sbin/alternatives --install /usr/bin/java java /usr/java/default/bin/java 20000

It will register and prefer the Oracle java installation as an alternative. OpenJDK has weight 16000; here we register with 20000. Once you've run this command you can switch between java versions by using the (already mentioned) alternatives --config java command.

As for a less quick fix you can use my virtual java package. It's quite possibly not perfect (I'm open for improvements ;) ), but it Provides java (making my apache-tomcat package happy) and registers with the alternatives system. This virtual package simply depends on jdk...you can find it here: https://github.com/keystep/virtual-java-rpm

Upvotes: 16

Keerthivasan
Keerthivasan

Reputation: 12890

Please check that whether your JAVA_HOME points to JDK 6 using echo $JAVA_HOME. In order change your JAVA_VERSION to Java 6, you need to point to the Java development KIT 6. You also need to add the bin directory to the $PATH variable. Please ensure that JDK6 bin directory comes in the $PATH prior to other JDK bin,if any. You can check the version of your Java in the environment by command java -version.The other answer by learningloop is very perfect to switch between different Java configurations

Upvotes: 1

bprasanna
bprasanna

Reputation: 2453

Run the following command to see if your JVM is getting listed.

sudo update-alternatives --config java

If your JVM gets listed select it.

Upvotes: 6

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