Java Unsupported major.minor version 52.0 error Minecraft [duplicate]

Answer 1

You are compiling your plugin with the Java 8 compiler. You are running your server with Java 7, which is not capable of reading the Java 8-format class files in your plugin.

You can either:

• Update the server to Java 8.
• Make Eclipse use the Java 7 compiler (if it's installed on your development machine) by selecting a Java 7 JDK version, in Preferences > Java > Installed JREs:
• Make Eclipse tell the Java 8 compiler to pretend to be the Java 7 compiler, by setting your "compiler compliance level" to 1.7, in Preferences > Java > Compiler:

Answer 2

Your code has been compiled with Java 8, while you are trying to run it with Java 7. Note that Eclipse has it's own compiler and does not use the one from the JDK and most probably it is configured to use Java 8. Check you eclipse compiler preferences.

Answer 3

You have to download java8 and run it with this jre.