1. Upgrade java openjdk to 1.7.0

[root@frank ~]# yum install java-1.7.0-openjdk.x86_64

2. Check version and choose correct java

[root@frank ~]# java -version
java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.1) (rhel-1.45.1.11.1.el6-x86_64)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)
[root@frank ~]# alternatives --config java
There are 2 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*+ 1           /usr/lib/jvm/jre-1.6.0-openjdk.x86_64/bin/java
   2           /usr/lib/jvm/jre-1.7.0-openjdk.x86_64/bin/java
Enter to keep the current selection[+], or type selection number: 2
[root@frank ~]# java -version
java version "1.7.0_03-icedtea"  <<<
OpenJDK Runtime Environment (rhel-2.1.el6.7-x86_64)
OpenJDK 64-Bit Server VM (build 22.0-b10, mixed mode)

完整阅读