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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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by Uki D. Lucas on Thursday, June 25, 2015
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My favorite quotations..


“A man should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.”  by Robert A. Heinlein

"We are but habits and memories we chose to carry along." ~ Uki D. Lucas

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