Switch existing Java versions in Linux

Instigation:

I have installed two Java versions in my machine(6 and 7). I was using Java 6 because of a product which requires it. But later I wanted to switch from Java 6 to Java 7. 

step 1:  Check available versions.

Type following command in CLI: 

 sudo update-alternatives --config java

give the proper selection number as you want.



step 2:  Update your bashrc.

command: vim ~/.bashrc

Set(comment the current one and add new variable) or update(change existing one) the JAVA_HOME and PATH shell variables as follows:

 
export JAVA_HOME="/usr/lib/jvm/java-7-oracle"
export PATH="$PATH:$JAVA_HOME/bin"

Save and exit:

Press Esc  and then press colon(:)

Type "wq!"

Press Enter

step 3:  Verify new Java settings.

command: java -version

Sample output:

bhagya@bhagya-ThinkPad-T530:~$ java -version

java version "1.7.0_55"
Java(TM) SE Runtime Environment (build 1.7.0_55-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.55-b03, mixed mode)

WSO2 ESB shows the highest performance in the Space....

WSO2 ESB team has published the performance study “ESB Performance Round 7.5″, by comparing following well known open sources ESBs with WSO2 ESB v4.8.1.

 1. AdroitLogic UltraESB v2.0.0
2. Mule ESB Community Edition v3.4.0
3. Talend ESB SE v5.3.1

The following table and graph show the summary results of the performance test.

As shown in the graph, WSO2 ESB 4.8.1 outperforms all the other ESBs except for the security scenario.

Conclusion:  WSO2 ESB is the fastest open source ESB on the Space.


For more information refer http://wso2.com/library/articles/2014/02/esb-performance-round-7.5 .