An internal error occurred during : “Publishing to Oracle WebLogic Server v10.3 at localhost…”. requested array is larger than heap
Solution: Goto C:\bea\user_projects\workspaces\default\.metadata\.plugins\org.eclipse.wst.server.core\publish location
And delete the .bat files starting with publish*.bat e.g: publish0.bat, publish1.bat etc. After deleting try to publish application. This should solve ur problem. Even after doing this if the problem persists then delete the server domain and create new domain.
Manohar Saddala 