Basic Authentication fails with multiple realms

Basic Authentication fails with multiple realms.
I setup of two realms on apache server . Both realms have different user databases. When I set Authenticator.setDefault() to one realm's user and then try to access the resource existing in second realm thru HttpURLConnection, then it throws the following exception.

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
        at java.util.LinkedList.entry(LinkedList.java:356)
        at java.util.LinkedList.get(LinkedList.java:299)
        at sun.net.www.protocol.http.PathMap.get(AuthenticationInfo.java:375)
        at sun.net.www.protocol.http.AuthenticationInfo.getAuth(AuthenticationInfo.java:181)
        at sun.net.www.protocol.http.AuthenticationInfo.getServerAuth(AuthenticationInfo.java:171)
        at sun.net.www.protocol.http.HttpURLConnection.getServerAuthentication(HttpURLConnection.java:951)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:611)
        at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:238)
        at BasicAuthTestCase.main(BasicAuthTestCase.java:34)


How to reproduce it:
====================
1. Take the attached BasicAuthTestCase.java
2. Need to setup two realms on apache(or may be any other server) . Both will be having two different user lists.

For example I have like...
realm -> AuthCheck/ -> It has a list of users
realm -> NoAuth/ -> It has a list of users

3. Execute the attached code

Output:
------
java BasicAuthTestCase
Response url1: 401 ---> Accessed before setting Authenticator.setDefault()
npath = /AuthCheck/
opath = /AuthCheck/
second Response url1: 200 --> After setting user info
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 --> {Tried to access second realm }
        at java.util.LinkedList.entry(LinkedList.java:356)
        at java.util.LinkedList.get(LinkedList.java:299)
        at sun.net.www.protocol.http.PathMap.get(AuthenticationInfo.java:375)
        at sun.net.www.protocol.http.AuthenticationInfo.getAuth(AuthenticationInfo.java:181)
        at sun.net.www.protocol.http.AuthenticationInfo.getServerAuth(AuthenticationInfo.java:171)
        at sun.net.www.protocol.http.HttpURLConnection.getServerAuthentication(HttpURLConnection.java:951)
        at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:611)
        at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:238)
        at BasicAuthTestCase.main(BasicAuthTestCase.java:34)