Java: Unsupported major.minor version 51.0

When you get an error:

Unsupported major.minor version X

This means that you are trying to compile your Java program with version lower that the code is written for; for example you develop with Java 1.7, deploy on the server where they have Java 1.6:

Unsupported major.minor version 51.0

The fix is:

• to change your code to use lower Java, which is sometimes impossible because of 3rd party library that you are using
• upgrade the other computer to modern Java, which is sometimes impossible because of a brick-head gatekeeper
• vent on the blog and start cutting out the code 

Java versions:

• J2SE 8 = 52
• J2SE 7 = 51 
• J2SE 6.0 = 50 
• J2SE 5.0 = 49 
• JDK 1.4 = 48 
• JDK 1.3 = 47 
• JDK 1.2 = 46 
• JDK 1.1 = 45

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