Possible Duplicate:
unsupported major .minor version 51.0
I installed JDK7, a simple hello word program gets compile but when I run this I got following exception.
Exception in thread "main" java.lang.UnsupportedClassVersionError: a (Unsupported major.minor version 51.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
I checked java -version
on command prompt, it shows Java version 1.4.2_03 but when I tried to install new java version from java.com it says that I'm having recommended Java 7 version.
This question is related to
java
exception
java-7
unsupported-class-version
Copy the contents of the PATH settings to a notepad and check if the location for the 1.4.2 comes before that of the 7. If so, remove the path to 1.4.2 in the PATH setting and save it.
After saving and applying "Environment Variables" close and reopen the cmd line. In XP the path does no get reflected in already running programs.
Assuming you are using Eclipse, on a MAC you can:
Eclipse.app
Eclipse -> Preferences
Java -> Installed JREs
Add...
buttonMacOS X VM
as the JRE type. Press Next./Library/Java/JavaVirtualMachines/1.7.0.jdk/Contents/Home
JDK 1.7
. Click Finish.File -> New -> Java Project
.Use default JRE (currently JDK 1.7)
Hope this helps
Sounds like you need to change the path to your java
executable to match the newest version.
Basically, installing the latest Java does not necessarily mean your machine is configured to use the latest version. You didn't mention any platform details, so that's all I can say.
I had this problem, after installing jdk7 next to Java 6. The binaries were correctly updated using update-alternatives --config java
to jdk7, but the $JAVA_HOME
environment variable still pointed to the old directory of Java 6.
Try sudo update-alternatives --config java
from the command line to set the version of the JRE you want to use. This should fix it.
Source: Stackoverflow.com