I am a total noob to Linux. I am in a "Intro to Java" class this semester and I am trying to get Java running correctly in Ubuntu 11.10. I got Windows 7 64-bit to compile and execute Java in cmd, but it's totally bugging me that I cannot get it to run in Ubuntu...
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 64-Bit Server VM (build 20.0-b11, mixed mode)
In my directory:
/usr/lib/jvm
It has the following folders.
java-1.6.0-openjdk
java-6-openjdk
java-1.7.0-openjdk-amd64
java-7-openjdk-amd64
java-7-openjdk-common
jdk1.7.0
I am having trouble executing java file. I get this message...
javac Hello.java
java Hello
Exception in thread "main" java.lang.UnsupportedClassVersionError: Hello : 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(Secure ClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader .java:277)
at java.net.URLClassLoader.access$000(URLClassLoader. java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java: 212)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 21)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 66)
Could not find the main class: Hello. Program will exit.
Could it be my PATH is set to an older version of Java?
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