[Java] java.lang.UnsupportedClassVersionError: example/Hello : Unsupported major.minor version 51.0 (unable to load class example.Hello)

今天在local編譯完java後，丟到機器後就爆炸了。
是JDK版本不一樣導致XD，記錄一下這個痛!!

java.lang.UnsupportedClassVersionError: example/Hello : Unsupported major.minor version 51.0 (unable to load class example.Hello)

Major Class Versions of Various JDK
Following are the major version of class file format in standard JDK environment.

JDK 1.1 = 45
JDK 1.2 = 46
JDK 1.3 = 47
JDK 1.4 = 48
JDK 1.5 = 49
JDK 1.6 = 50

Read more: http://javarevisited.blogspot.com/2011/07/javalangunsupportedclassversionerror.html#ixzz1wkGsPmna