CODEWITHSUNDEEP
javagwt
Dilantha
Dilantha

Reputation: 1634

java.lang.UnsupportedClassVersionError: Unsupported major.minor version 51.0

When i try to compile my GWT application i'm getting below exception. Any idea ? Thanks in advance. 

Loading inherited module 'widgets.PresentationWidgets'
   [ERROR] Unexpected error while processing XML
java.lang.UnsupportedClassVersionError: gwt/widgets/server/datagrid/util/WrapperGenerator : Unsupported major.minor version 51.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

Upvotes: 2

Views: 6123

Answers (1)

gnsb
gnsb

Reputation: 326

clearly, your Java runtime evnironment is different from that of compile time version

For me this solved the problem: I have a 64-bit system with jdk1.7 (32bit) and jdk1.6 (64 bit) installed. Even though I had specified PATH and JAVA_HOME for jdk1.7, my java -version was 1.6

  • I removed the folder in which jdk1.6 was installed

. The problem was gone. Apparently, a 64 bit system gave preference to jdk1.6(64bit) instead of jdk1.7(32bit)

For more info, refer: How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version

Upvotes: 2

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