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From "Shilpa Nalgonda" <snalgo...@mypublisher.com>
Subject RE: Tomcat 4.1 Connection Pooling...
Date Tue, 28 Sep 2004 16:54:52 GMT
But my application runs fine even with out that entry in web.xml, i am using
Tomcats ConnectionPooling to connect to database..I only have scalability
issue, when i test my application with multiple users i get the ORAcle erro
below..
If only one users is there, then there is no problem...can you please
suggest if adding that entry to web.xml will help...

java.sql.SQLException: ORA-00020: maximum number of processes (200) exceeded

        at oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java)
        at oracle.jdbc.ttc7.O3log.receive1st(O3log.java)
        at oracle.jdbc.ttc7.TTC7Protocol.logon(TTC7Protocol.java)
        at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java)
        at
oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.java)
        at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java)
        at
org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConne
ctionFactory.java:82)
        at
org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnect
ionFactory.java:300)
        at
org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPoo
l.java:816)
        at
org.apache.commons.dbcp.AbandonedObjectPool.borrowObject(AbandonedObjectPool
.java:119)
        at
org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.ja
va:140)
        at
org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:5
18)
        at
com.mypublisher.oemapi.DAO.DBAccess.getConnection(DBAccess.java:43)

-----Original Message-----
From: Shapira, Yoav [mailto:Yoav.Shapira@mpi.com]
Sent: Tuesday, September 28, 2004 12:53 PM
To: Tomcat Users List
Subject: RE: Tomcat 4.1 Connection Pooling...



Hi,
Yes, it's needed if you're using server-provided connection pooling.
Read the Servlet Specification.

Yoav Shapira
Millennium Research Informatics


>-----Original Message-----
>From: Shilpa Nalgonda [mailto:snalgonda@mypublisher.com]
>Sent: Tuesday, September 28, 2004 12:47 PM
>To: Tomcat Users List
>Subject: RE: Tomcat 4.1 Connection Pooling...
>
>Is it necessary to add this in web.xml, i have configured datasource
for
>connectonpool only in server.xml...
>
>
>web.xml
>-----------
><resource-ref>
><res-ref-name>jdbc/myoracle</res-ref-name>
><res-type>javax.sql.DataSource</res-type>
><res-auth>Container</res-auth>
></resource-ref>
>
>
>
>-----Original Message-----
>From: Shilpa Nalgonda [mailto:snalgonda@mypublisher.com]
>Sent: Wednesday, September 22, 2004 11:05 AM
>To: Tomcat Users List
>Subject: RE: Tomcat 4.1 Connection Pooling...
>
>
>Thanks.
>Maybe its the parameter configuration can you send me your
configuration
>for
>connection pooling...
>I am using these parameters...
>maxActive :20
>>maxIdle :10
>>maxWait :10000
>>removeAbandoned :true  -- what exactly is MaxIdle  parameter..????
>
>Also my application makes 7 database queries, each query gets
connection
>from datasource and closes() the connection in finally block.  When it
gets
>connection from datasource it is supposed to get it from pool right???
>
>I noticed that after my application runs 3 times --(3x7 =21).. it gives
me
>this error
>
>org.apache.commons.dbcp.SQLNestedException: Cannot get a connection,
pool
>exhausted, cause:
>java.util.NoSuchElementException: Timeout waiting for idle object
>        at
>org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericOb..
>
>So can you send me ur config and code snippet to get datasource if
>possible...
>
>
>-----Original Message-----
>From: Shapira, Yoav [mailto:Yoav.Shapira@mpi.com]
>Sent: Wednesday, September 22, 2004 10:55 AM
>To: Tomcat Users List
>Subject: RE: Tomcat 4.1 Connection Pooling...
>
>
>
>Hi,
>Nope, I can't help unfortunately.  I used Tomcat 4.1 for years
>connecting to Oracle 8i and 9i, and I continue to do so now with Tomcat
>5.0 and 5.5.  Maybe I'm just lucky, but the docs (specifically the JDBC
>DataSources how-to) have always worked for me out of the box.  I've
>never seen the error you describe.
>
>Yoav Shapira
>Millennium Research Informatics
>
>
>>-----Original Message-----
>>From: Shilpa Nalgonda [mailto:snalgonda@mypublisher.com]
>>Sent: Wednesday, September 22, 2004 10:44 AM
>>To: Tomcat Users List
>>Subject: RE: Tomcat 4.1 Connection Pooling...
>>
>>Hi Yoav Shapira,
>>Can you put some light on this pooling stuff...
>>Thanks.
>>Shilpa.
>>
>>-----Original Message-----
>>From: Shilpa Nalgonda [mailto:snalgonda@mypublisher.com]
>>Sent: Wednesday, September 22, 2004 9:31 AM
>>To: Tomcat Users List
>>Subject: RE: Tomcat 4.1 Connection Pooling...
>>
>>
>>Hi Cary,
>>I am running my application on both windowsxp and Linux. And my Oracle
>>version is 8i.
>>I have the same problem on both OS.  I think increasing the number of
>>processes would not help.
>>This has got something to do with Tomcat connection pooling
>configuration.
>>I am missing some configuration stuff there...
>>if i use these below parameters in server.xml iget timeout
>exception...just
>>after couple of requests..
>>maxActive :20
>>maxIdle :10
>>mxWait :10000
>>removeAbandoned :true
>>"org.apache.commons.dbcp.SQLNestedException: Cannot get a connection,
>pool
>>exhausted, cause:
>>java.util.NoSuchElementException: Timeout waiting for idle object "
>>
>>And if i use this below configuration i get ORA:00020 exception...
>>maxActive :0
>>maxIdle :0
>>mxWait :0
>>removeAbandoned :true
>>
>>Can you please help---i have been looking into this since 2 days and
>still
>>it doesn't work...
>>
>>-----Original Message-----
>>From: Cary Conover [mailto:tcqcary@yahoo.com]
>>Sent: Tuesday, September 21, 2004 10:09 PM
>>To: Tomcat Users List
>>Subject: RE: Tomcat 4.1 Connection Pooling...
>>
>>
>>Shilpa,
>>
>>What OS are you running this configuration on?  If it is AIX I would
>>investigate to see how the system is configured for the number of
>processes
>>per user on the system.  If it is configured as a Workstation it is
>>defaulted to 128 processes / login.  If it is configured as a server
it
>is
>>set to 500 processes / login.  Plus Oracle support site suggests in
the
>>neighborhood of 2500 processes / login for Oracle 9i to function well
>if
>>you
>>are running 9i.  These are all system settings that can be found in
>smitty
>>on the system and adjusted as root user.
>>
>>Hope this helps,
>>
>>Cary
>>
>>Shilpa Nalgonda <snalgonda@mypublisher.com> wrote:
>>Can someone please suggest how to achieve connection Pooling in tomcat
>4.1.
>>As per the docs i have
>>1) configured server.xml to include the resource parameters (
>datasource,
>>connection pool size etc)
>>2) In application code , retrieve connection using datasource
>>3) Every Method call to database retrieves connection
>>using datasource.getConnection ()
>>and closes connection everytime
>>
>>But still the pooling is not achieved, i get ORA-00020 error( maximim
>>proceses exceeded), i increased the size from 30 to 200) even then it
>is
>>not
>>working.
>>
>>Can someone please help----
>>
>>-----Original Message-----
>>From: Shilpa Nalgonda [mailto:snalgonda@mypublisher.com]
>>Sent: Monday, September 20, 2004 12:55 PM
>>To: Tomcat Users List
>>Subject: org.apache.commons.dbcp.SQLNestedException: Cannot get a
>>connection, pool exhausted, cause:
>>
>>
>>Hi, I am getting the timeout exception for connection pooling, i am
>using
>>Tomca 4.1 and datasource to retrieve connections.
>>I am attaching all the soure code and configuration files used in my
>>application, please suggest where iam doing wrong...
>>
>>SEVERE: getConnection()--SQLException
>>org.apache.commons.dbcp.SQLNestedException: Cannot get a connection,
>pool
>>exhausted, cause:
>>java.util.NoSuchElementException: Timeout waiting for idle object
>>at
>>org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObj
e
>ctPo
>>o
>>l.java:801)
>>at
>>org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSou
r
>ce.j
>>a
>>va:140)
>>at
>>org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.
j
>ava:
>>5
>>18)
>>at
>>com.mypublisher.oemapi.DAO.DBAccess.getConnection(DBAccess.java:47)
>>at com.mypublisher.oemapi.DAO.Persister.(Persister.java:46)
>>at
>>com.mypublisher.oemapi.SubmitOrder.SubmitOrder(SubmitOrder.java:61)
>>at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>at
>>sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.j
a
>va:3
>>9
>>)
>>at
>>sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccess
o
>rImp
>>l
>>.java:25)
>>at java.lang.reflect.Method.invoke(Method.java:324)
>>at org.apache.xmlrpc.Invoker.execute(Invoker.java:168)
>>at
>>org.apache.xmlrpc.XmlRpcWorker.invokeHandler(XmlRpcWorker.java:123)
>>at org.apache.xmlrpc.XmlRpcWorker.execute(XmlRpcWorker.java:185)
>>at org.apache.xmlrpc.XmlRpcServer.execute(XmlRpcServer.java:151)
>>at org.apache.xmlrpc.XmlRpcServer.execute(XmlRpcServer.java:128)
>>at
>>com.mypublisher.oemapi.xmlrpc.XmlRpcServlet.doPost(XmlRpcServlet.java
>>======================================================================
=
>====
>>=
>>===========
>>server.xml
>>---------
>>xmlrpc-oemapi-->
>>debug="5" reloadable="true" crossContext="true" useNaming="true">
>>
>>prefix="localhost_rpcoemapi_log." suffix=".txt"
>>timestamp="true"/>
>>auth="Container"
>>type="javax.sql.DataSource"/>
>>
>>
>>
>>
>>factory
>>org.apache.commons.dbcp.BasicDataSourceFactory
>>
>>
>>
>>         configure your mysqld max_connections large enough to handle
>>         all of your db connections. Set to 0 for no limit.
>>         -->
>>
>>
>>maxActive
>>5
>>
>>
>>
>>         Set to 0 for no limit.
>>         -->
>>
>>
>>maxIdle
>>2
>>
>>
>>
>>         in ms, in this example 10 seconds. An Exception is thrown if
>>         this timeout is exceeded.  Set to -1 to wait indefinitely.
>>         -->
>>
>>
>>maxWait
>>10000
>>
>>
>>
>>
>>
>>
>>username
>>ioeadmin
>>
>>
>>
>>
>>password
>>ioeadmin
>>
>>
>>
>>
>>
>>
>>driverClassName
>>oracle.jdbc.driver.OracleDriver
>>
>>
>>
>>         The autoReconnect=true argument to the url makes sure that
the
>>         mm.mysql JDBC Driver will automatically reconnect if mysqld
>closed
>>the
>>         connection.  mysqld by default closes idle connections after
8
>>hours.
>>         -->
>>
>>
>>url
>>jdbc:oracle:thin:@ipaddress:1521:MYDB
>>
>>
>>
>>
>>
>>======================================================================
=
>====
>>=
>>===================================
>>DatasourceFactory is a singleton class used to retrieve the datasource
>from
>>tomcat using JNDi..and connection is obtained from datasource...
>>public static DataSource getInstance() throws SystemException
>>{
>>if (!isDataSrcAvaliable)
>>{
>>if (dataSource == null)
>>{
>>new DataSourceFactory();
>>doLookUp();
>>isDataSrcAvaliable = true;
>>} //end if (dataSource == null)
>>}// end if (!isDataSrcAvaliable)
>>return dataSource;
>>} /* end getInstance() */
>>
>>doLookUp method does this:
>>Context ctx = new InitialContext();
>>String dataSrc =
>>msgResource.getMessage(OEMAPIConstants.DATA_SOURCE_NAME);
>>Context env = (Context)ctx.lookup("java:comp/env");
>>dataSource = (DataSource) env.lookup(dataSrc);
>>
>>
>>public static Connection getConnection() throws DAOException
>>{
>>DataSource ds = (DataSource) DataSourceFactory.getInstance();
>>Connection con = ds.getConnection();
>>return ds.getConnection();
>>}
>>and every database lookup class, gets this connection and closes the
>>connection after the query to database...
>>
>>
>>
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>>
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>>
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>
>
>
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