UnsupportedClassVersionError exception in Java 1.6.0

Question

$ pwd
/home/tu/java/testpackage

$ cat Test.java 
package testpackage;

public class Test {
    public static void main(String[] args) {
        System.out.println("hi");
    }
}

$ javac -version
javac 1.7.0_147

$ java -version
java version "1.6.0_23"
OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b23~pre11-0ubuntu1.11.10.2)
OpenJDK Client VM (build 20.0-b11, mixed mode, sharing)

$ cd ..
$ javac -cp . testpackage/Test.java

$ java -cp . testpackage.Test

Exception in thread "main"
java.lang.UnsupportedClassVersionError: testpackage/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: testpackage.Test. Program will exit.

What could be wrong in my case of this error?

Use java -cp . testpackage.Test. The argument to java is a class name and not the Java source file name. — Joachim Sauer
– Joachim Sauer, Commented May 14, 2012 at 10:27
I edited it, now it should reflect it. When I was trying more possibilities in the commands, this was one of the errors that occurred. — xralf
– xralf, Commented May 14, 2012 at 12:57

AlexR · Accepted Answer · 2012-05-14 10:29:31Z

2

java utility is not a compiler. It is JVM.

You should compile your code first:

javac -cp . testpackage/Test.java

This will produce Test.class file. Now you can run it:

java -cp . testpackage.Test

Pay attention that when you are running the program you do not have to write .class extension.

answered May 14, 2012 at 10:29

AlexR

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2 Comments

xralf Over a year ago

I have done it. Now it ends with UnsupportedClassVersionError

xralf Over a year ago

This is the continuation of the question that helped me to solve it completely.

Greg Kopff · Accepted Answer · 2012-05-14 10:28:15Z

0

Remove .java from you java command.

You need to specify the fully qualified classname which is just "testPackage.Test".

answered May 14, 2012 at 10:28

Greg Kopff

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1 Comment

xralf Over a year ago

I have done it. Now it ends with UnsupportedClassVersionError

GreyBeardedGeek · Accepted Answer · 2012-05-14 10:29:10Z

0

From /home/tu/java :

java -cp . testPackage.Test

(don't put '.java' on the end)

answered May 14, 2012 at 10:29

GreyBeardedGeek

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1 Comment

xralf Over a year ago

I have done it. Now it ends with UnsupportedClassVersionError

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