Exception in thread main java lang UnsupportedClassVersionError a Unsupported major minor version 51 0

Question

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

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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

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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

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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

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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

User · Answer

Assuming you are using Eclipse  on a MAC you can    Launch Eclipse app Choose Eclipse - gt  Preferences Choose Java - gt  Installed JREs Click the Add    button Choose MacOS X VM as the JRE type  Press Next  In the  JRE Home   field  type  Library Java JavaVirtualMachines 1 7 0 jdk Contents Home You should see the system libraries in the list titled  JRE system libraries   Give the JRE a name  The recommended name is JDK 1 7  Click Finish  Check the checkbox next to the JRE entry you just created  This will cause Eclipse to use it as the default JRE for all new Java projects  Click OK  Now  create a new project  For this verification  from the menu  select File - gt  New - gt  Java Project  In the dialog that appears  enter a new name for your project  For this verification  type Test17Project In the JRE section of the dialog  select Use default JRE  currently JDK 1 7  Click Finish    Hope this helps

[java] Exception in thread "main" java.lang.UnsupportedClassVersionError: a (Unsupported major.minor version 51.0)

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