problem with connection

[smitanaik]

500 Internal Server Error
java.sql.SQLExc eption: Listener refused the connection with the following error:ORA-12519, TNS:no appropriate service handler foundThe Connection descriptor used by the client was:localhost:1 521:XE


this is error i am facing

is thee any solution to this
and how to specify quer timeout?

[debasisdas]

Run "lsnrctl services" to ensure that the instance(s) have registered with the listener, and are accepting connections.