UnknownHost Exception

I am getting following error on Solaris OS. 

-a: -a 

java.net.UnknownHostException: -a: -a 
at java.net.InetAddress.getLocalHost(InetAddress.java:1315) 
at org.apache.jsp.index_jsp._jspService(index_jsp.java:178) 
at 
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) 
at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324) 
at 
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292) 
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) 
at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:427) 
at 
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:475) 
at 
org.mortbay.jetty.servlet.Dispatcher.dispatch(Dispatcher.java:275) 
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:169) 
at org.mortbay.jetty.servlet.Default.handleGet(Default.java:312) 
at org.mortbay.jetty.servlet.Default.service(Default.java:232) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689) 
at 
org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:427) 
at 
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:475) 
at 
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:556) 
at org.mortbay.http.HttpContext.handle(HttpContext.java:1563) 
at 
org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:623) 
at org.mortbay.http.HttpContext.handle(HttpContext.java:1515) 
at org.mortbay.http.HttpServer.service(HttpServer.java:956) 
at org.mortbay.http.HttpConnection.service(HttpConnection.java:814) 
at 
org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981) 
at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831) 
at 
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244) 
at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357) 
at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534) 


The line that it is pointing to is 
String hostname = InetAddress.getLocalHost().getHostName(); 

I have checked /etc/hosts and /etc/nsswitch.conf files - they 
seem to be ok. 

When I do getent hosts localhost - it returns correct IP 
address. 

Going by the directory name,version seems to be 2.7 

It used to work fine earlier - it stopped working since last few
 months.Can someone point something?

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