i had encounter an error on gwt . i can't find what it means. please
give some gudielines.
Have look at my error below.
adv thxs friends.
[ERROR] Failure to load module 'com.gwtbook.Gadgets'
java.lang.UnsupportedClassVersionError: Bad version number in .class
file
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:
124)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at com.google.gwt.dev.javac.JdtCompiler$INameEnvironmentImpl.findType
(JdtCompiler.java:140)
at com.google.gwt.dev.javac.JdtCompiler$INameEnvironmentImpl.findType
(JdtCompiler.java:125)
at
org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType
(LookupEnvironment.java:122)
at
org.eclipse.jdt.internal.compiler.lookup.PackageBinding.getTypeOrPackage
(PackageBinding.java:178)
at org.eclipse.jdt.internal.compiler.lookup.Scope.getType(Scope.java:
2187)
at com.google.gwt.dev.javac.LongFromJSNIChecker
$CheckingVisitor.findClass(LongFromJSNIChecker.java:188)
at com.google.gwt.dev.javac.LongFromJSNIChecker
$CheckingVisitor.getMethod(LongFromJSNIChecker.java:223)
at com.google.gwt.dev.javac.LongFromJSNIChecker
$CheckingVisitor.checkMethodRef(LongFromJSNIChecker.java:100)
at com.google.gwt.dev.javac.LongFromJSNIChecker
$CheckingVisitor.checkRefs(LongFromJSNIChecker.java:140)
at com.google.gwt.dev.javac.LongFromJSNIChecker
$CheckingVisitor.endVisit(LongFromJSNIChecker.java:63)
at org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.traverse
(MethodDeclaration.java:247)
at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse
(TypeDeclaration.java:1222)
at
org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.traverse
(CompilationUnitDeclaration.java:518)
at com.google.gwt.dev.javac.LongFromJSNIChecker.check
(LongFromJSNIChecker.java:307)
at com.google.gwt.dev.javac.LongFromJSNIChecker.check
(LongFromJSNIChecker.java:297)
at
com.google.gwt.dev.javac.CompilationUnitInvalidator.validateCompilationUnits
(CompilationUnitInvalidator.java:138)
at com.google.gwt.dev.javac.CompilationState.compile
(CompilationState.java:123)
at com.google.gwt.dev.cfg.ModuleDef.updateTypeOracle(ModuleDef.java:
477)
at com.google.gwt.dev.cfg.ModuleDef.getTypeOracle(ModuleDef.java:324)
at com.google.gwt.dev.GWTShell
$BrowserWidgetHostImpl.createModuleSpaceHost(GWTShell.java:252)
at com.google.gwt.dev.shell.ie.BrowserWidgetIE6$External.gwtOnLoad
(BrowserWidgetIE6.java:72)
at com.google.gwt.dev.shell.ie.BrowserWidgetIE6$External.invoke
(BrowserWidgetIE6.java:139)
at com.google.gwt.dev.shell.ie.IDispatchImpl.Invoke
(IDispatchImpl.java:294)
at com.google.gwt.dev.shell.ie.IDispatchImpl.method6
(IDispatchImpl.java:194)
at org.eclipse.swt.internal.ole.win32.COMObject.callback6
(COMObject.java:117)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:1925)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2966)
at com.google.gwt.dev.GWTShell.pumpEventLoop(GWTShell.java:720)
at com.google.gwt.dev.GWTShell.run(GWTShell.java:593)
at com.google.gwt.dev.GWTShell.main(GWTShell.java:357)
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