Solution for SQL Exception

Question

i am writing a servlet to retrieve data in a table
I e.getMessage() printed as
SQLEXception caught:Io exception: The Network Adapter could not establish the connection
i am connecting like the following :
Class.forName("oracle.jdbc.driver.OracleDriver");
Con=DriverManager.getConnection("jdbc:oracle:thin:@localsysname:1521:mysid","scott","tiger");
What was the problem ? how to provide solution for this
Can Anyone plz Help me
Thanx in advance...
Nalluri          

Answer 1

I am using :
windows 2000,
oracle 9.2.0.1.0 ,jdbc drivers r classes12.jar came along with oracle,
java 1.4.0
Apache TomCat 4.1 as webserver server and servlet.jar come along with tomcat
With 'services.msc' I checked TNSListener
i checked log in ORACLE_HOME/ora92/network/log /listener.log and sqlnet.log
I am not able to understand fully what they tell abt
1) sqlnet.log has reported some Fatal NI Connect error 12638 but even when listener was being started also means it didn't show any difference when listener is alive and when it died
2)listener.log It showed difference in case of success and failure
at success : just listening for TCP ,ipc inforamtion is there
but at failure in addtion to to the above so many Service_update r there after service_registers
I am just appening those logs just have a glance at them
sqlnet.log
Fatal NI connect error 12638, connecting to:
(DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))
  VERSION INFORMATION:
     TNS for 32-bit Windows: Version 9.2.0.1.0 - Production
     Oracle Bequeath NT Protocol Adapter for 32-bit Windows: Version 9.2.0.1.0 - Production
  Time: 29-JUN-2004 11:30:57
  Tracing not turned on.
  Tns error struct:
    nr err code: 0
    ns main err code: 12638
    TNS-12638: Credential retrieval failed
    ns secondary err code: 0
    nt main err code: 0
    nt secondary err code: 0
    nt OS err code: 0----------------------------------------------------------------------------------------------------------------------------------------
listener.log
-----------------------------at success--------------------
Started with pid=1680
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC0ipc)))
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=bnal)(PORT=1521)))
TIMESTAMP * CONNECT DATA [* PROTOCOL INFO] * EVENT [* SID] * RETURN CODE
29-JUN-2004 11:26:18 * (CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=hanuma)(CID=(PROGRAM=C:\Program Files\Oracle\jre\1.1.8\bin\jrew.exe)(HOST=BNAL)(USER=bnalluri))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.36)(PORT=3546)) * establish * hanuma * 0
------------------------------at failure-----------------------
Started with pid=768
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC0ipc)))
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=bnal)(PORT=1521)))
TIMESTAMP * CONNECT DATA [* PROTOCOL INFO] * EVENT [* SID] * RETURN CODE
29-JUN-2004 11:34:28 * service_register * Sakthi * 0
29-JUN-2004 11:34:34 * service_register * hanuma * 0
29-JUN-2004 11:35:03 * service_update * Sakthi * 0
29-JUN-2004 11:36:25 * service_update * hanuma * 0
29-JUN-2004 11:38:02 * service_update * hanuma * 0
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=bnal)(PORT=8080))(Presentation=HTTP)(Session=RAW))
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=bnal)(PORT=2100))(Presentation=FTP)(Session=RAW))
29-JUN-2004 11:38:23 * service_update * hanuma * 0
29-JUN-2004 11:39:07 * service_update * hanuma * 0
29-JUN-2004 11:40:13 * service_update * hanuma * 0
29-JUN-2004 11:40:46 * service_update * hanuma * 0
29-JUN-2004 11:41:22 * service_update * hanuma * 0
29-JUN-2004 11:43:34 * service_update * hanuma * 0
29-JUN-2004 11:45:04 * service_update * Sakthi * 0
29-JUN-2004 11:46:19 * service_update * hanuma * 0
29-JUN-2004 11:47:04 * service_update * hanuma * 0
29-JUN-2004 11:47:49 * service_update * hanuma * 0
29-JUN-2004 11:48:28 * service_update * hanuma * 0
29-JUN-2004 11:49:08 * service_update * hanuma * 0
29-JUN-2004 11:49:50 * service_update * hanuma * 0
29-JUN-2004 11:50:32 * service_update * hanuma * 0
29-JUN-2004 11:51:50 * service_update * hanuma * 0
29-JUN-2004 11:52:44 * (CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=hanuma)(CID=(PROGRAM=C:\Program Files\Oracle\jre\1.1.8\bin\jrew.exe)(HOST=BNAL)(USER=bnalluri))) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.1.36)(PORT=1104)) * establish * hanuma * 0----------------------------------------------------------------------------------------------------------------------------------------------
plz have a glance and tell me ur view abt it ...
Nalluri