ElasticSearch Startup error

elasticsearch_startup_error.log

[root@ip-10-74-171-50 bin]# pwd
/mnt/elasticsearch-1.3.4/bin
[root@ip-10-74-171-50 bin]#./elasticsearch
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/elasticsearch/bootstrap/Elasticsearch : Unsupported major.minor version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: org.elasticsearch.bootstrap.Elasticsearch.  Program will exit.

Needs Java 7
http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/setup.html

Also Ref:
http://stackoverflow.com/questions/10382929/unsupported-major-minor-version-51-0