I was doing my homework in eclipse and it reported no errors, not even warnings. When I tried to compile it from terminal I got following error. It runs and compiles just fine with eclipse. I take it it has something to do with java version? Anyway to fix it or try to bypass it?
vedran@vedran-debian:~/java/oop/Aufgabe6$ java Test
Exception in thread "main" java.lang.UnsupportedClassVersionError: Test : Unsupported major.minor version 51.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: Test. Program will exit.
Java version:
java version "1.6.0_23"
OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b23~pre11-1)
OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode)
EDIT:
Thank you all for your explanations. It seems to be a java6/7 issue. I just compiled it with 1.6 and it worked like charm.
The Test.class file has been compiled in Java 7 (major/minor version 51.0), so it's incompatible with the Java 6 (major/minor version 50.0) runtime. Either compile the .java file in Java 6 (or earlier), or run the .class in a Java 7 runtime.
Maybe your Compiler in eclipse is different? Preferences -> Compiler: Compiler level. Maybe Java 7?
If you are under Linux, you can have a look for all your installed runtime environments: update-alternatives --config java. Here you can choose the correct one. Here you should be able to find the OpenJDK 7.
51.0 indicates Java version 7, so the class file you're trying to run was compiled with a version 7 compiler. If you need to run the code with a version 6 JVM you should instruct the compiler to emit version 6 compatible byte code.
javac -version 6 ...
That command line argument will force a higher version compiler to restrict its output to bytecode that's compatible with a version 6 runtime environment.
In Eclipse, go to Window-->Preferences-->Java-->Compiler and you will see a field labeled "Compiler compliance level". Set it to 1.6, and recompile in Eclipse.
There is a Java version mismatch between Eclipse and your command-line javac. Specifically, your javac seems to be using 64-bit 1.6. Eclipse apparently is using 1.7.
Is it possible you've compiled your Test program Java 7 and are now attempting to run it against Java 6 in the terminal? I would try recompiling in the terminal (ie. Java 6) if that's the case and then attempt to re-run the program.
If solutions above are all set , if u still have the same issue and
if your using MAVEN then check in the pom.xml. JAVA ASSIST JAR should point 16.1-GA if your using jdk 1.6 else corresponding version should be added for the jdk that you are pointing to.(eg : 3.17.1 for jdk 7).For jdk 6 add the dependency with the following details
- groupId : org.javassist
- artifactId: javassist
- version : 3.16.1-GA
