#1 java.io.UnsupportedEncodingException: Encoding: gb2312 not f

[Anonymous]

java.io.UnsupportedEncodingException: Encoding: gb2312 not found

UnsupportedEncodingException: Encoding: gb2312 not found.]
java.lang.StringHelper.getCharset(String ) +472
java.lang.StringHelper.getBytes(String , String ) +86
java.lang.StringHelper.getBytes(String ) +70

[Error: java.io.UnsupportedEncodingException: Encoding: gb2312 not found.]
java.security.AccessController.doPrivileged(PrivilegedAction action) +150
java.util.logging.Logger..cctor() +81

[TypeInitializationException: The type initializer for 'java.util.logging.Logger' threw an exception.]
java.util.logging.Logger.getLogger(String name) +0
gnu.classpath.ServiceFactory..cctor() +26

[TypeInitializationException: The type initializer for 'gnu.classpath.ServiceFactory' threw an exception.]
gnu.classpath.ServiceFactory.lookupProviders(Class spi) +0
java.nio.charset.Charset.providers2() +261
java.nio.charset.Charset.charsetForName(String ) +68
java.nio.charset.Charset.forName(String charsetName) +81
java.lang.StringHelper.getCharset(String ) +64
java.lang.StringHelper.getBytes(String , String ) +86
java.lang.String.instancehelper_getBytes(String this, String charsetName) +32
java.io.PrintStream.writeChars(String , Int32 , Int32 ) +56
java.io.PrintStream.print(String , Boolean ) +88
java.io.PrintStream.println(String str) +49
com.mdcl.Token2Value.getTokenValue(String token, String server) +696
WebTestJava._Default.Page_Load(Object sender, EventArgs e) in D:\VBWithJava\WebTestJava\WebTestJava\Default.aspx.cs:23
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +34
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +47
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1061

It seems that it does't support gb2312,How should i do?