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Answer 1

+1 A:

You haven't provided enough information, such as the stack trace and the code. However, what I can tell is that ExceptionInInitializerError occurs when a static initialization code throws a runtime exception. Note that the exception wraps the triggering runtime exception, so try to view the complete stack trace and analyze it.

Here is an example:

public class Test {
    static {
        String s = "hi";
        s.substring(10);
    }

    public static void main(String[] args) {

    }
}

The stack trace printout is:

java.lang.ExceptionInInitializerError
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -8
    at java.lang.String.substring(String.java:1938)
    at java.lang.String.substring(String.java:1905)
    at Test.<clinit>(Test.java:5)
Exception in thread "main"

--EDIT--

now that you provided more details, take a look at the other response which is more specific to your case: you either have another session of your GWT application already running, or you have some other server application on the localhost, listening on port 8888.

Eyal Schneider 2010-07-27 11:19:25

Answer 2

+2 A:

You have another session active, the stack trace is pretty obvious:

[ERROR] Unable to bind socket on port 9997 -- is another session active?

java.net.BindException: Address already in use at java.net.PlainSocketImpl.socketBind(Native Method)

Port 127.0.0.1:8888 is already is use; you probably still have another session active

Robert Munteanu 2010-07-28 12:10:52

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