What does Unsupported major minor version 52 0 mean and how do I fix it

Question

Ok so I loosely understand that 52 0 is Java 8  and that the exceptions means that some code is compiled with one version of java  and some with another   What I can t get my head around is which way around it is   Here s the stack trace that I get   Exception in thread  main  java lang UnsupportedClassVersionError  org openrdf model ValueFactory   Unsupported major minor version 52 0     at java lang ClassLoader defineClass1 Native Method      at java lang ClassLoader defineClass ClassLoader java 800      at java security SecureClassLoader defineClass SecureClassLoader java 142      at java net URLClassLoader defineClass URLClassLoader java 449      at java net URLClassLoader access 100 URLClassLoader java 71      at java net URLClassLoader 1 run URLClassLoader java 361      at java net URLClassLoader 1 run URLClassLoader java 355      at java security AccessController doPrivileged Native Method      at java net URLClassLoader findClass URLClassLoader java 354      at java lang ClassLoader loadClass ClassLoader java 425      at sun misc Launcher AppClassLoader loadClass Launcher java 308      at java lang ClassLoader loadClass ClassLoader java 358      at java lang Class getDeclaredMethods0 Native Method      at java lang Class privateGetDeclaredMethods Class java 2615      at java lang Class getMethod0 Class java 2856      at java lang Class getMethod Class java 1668      at sun launcher LauncherHelper getMainMethod LauncherHelper java 494      at sun launcher LauncherHelper checkAndLoadMain LauncherHelper java 486    I m executing my code from eclipse and it crashes before reaching main   I ve followed a few posts on here saying to change my compliance level my JRE  but I can t seem to get it to fix   Is the error saying that the class  ValueFactory  has been compiled with java 8  or that my code has  I ve tried changing my compliance level to 1 6  1 7  and 1 8  but neither of these fixed the issue

User · Answer

Your code was compiled with Java 8   Either compile your code with an older JDK  compliance level  or run it on a Java 8 JRE   Hope this helps

User · Answer

You don t need to change the compliance level here  or rather  you should but that s not the issue    The code compliance ensures your code is compatible with a given Java version    For instance  if you have a code compliance targeting Java 6  you can t use Java 7 s or 8 s new syntax features  e g  the diamond  the lambdas  etc  etc     The actual issue here is that you are trying to compile something in a Java version that seems different from the project dependencies in the classpath    Instead  you should check the JDK JRE you re using to build    In Eclipse  open the project properties and check the selected JRE in the Java build path    If you re using custom Ant  etc   scripts  you also want to take a look there  in case the above is not sufficient per se

User · Answer

Actually you have a code compiled targeting a  higher JDK  JDK 1 8 in your case  but at runtime you are supplying a lower JRE JRE 7 or below     you can fix this problem by adding target parameter while compilation e g  if your runtime target is 1 7  you should use 1 7 or below  javac -target 1 7   java   if you are using eclipse  you can sent this parameter at  Window -  Preferences -  Java -  Compiler -  set  Compiler compliance level    choose your runtime jre version or lower

[java] What does 'Unsupported major.minor version 52.0' mean, and how do I fix it?

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