java.lang.UnsupportedClassVersionError: Bad version number in .class file?

Question

I am getting this error when I include an opensource library that I had to compile from source. Now, all the suggestions on the web indicate that the code was compiled in o

Answer 1

changing the project to use java 1.7: For this to work follow those steps :

• Change Compiler Compliance Level
• Change your projects JRE/JDK to something of the same level(1.7 in my case)
• Do the same change in all the projects referenced by your project
• Change your run/debug configuration to use the JRE/JDK (or of the same level)

Not working?

• delete projects Bin directory
• Clean
• reBuild

Still not working?

in your project's directory: edit .settings/org.eclipse.jdt.core.prefs > make sure your target level is applied

Good Luck!