JDBC Connection pool recovery after DB server restart

I am finding that Kodo is throwing the following exception after I restart
my database server (mysql). I am doing the database server restart while my
application server is idle, so it is not during a transaction.
Communication link failure: java.net.SocketException [code=0;state=08S01]
NestedThrowables:
com.solarmetric.kodo.impl.jdbc.sql.SQLExceptionWrapper:
This is presumably due to the JDBC connection pooling. Is there a
configuration setting that allows Kodo to detect such failures and reconnect
to the database server without exposing this problem to the application
code? For example, WebLogic Server's JDBC connection pool has a setting that
enables testing a connection and recovering from such failures before
allocating it from the pool.
Ben

This is presumably due to the JDBC connection pooling. Is there a
configuration setting that allows Kodo to detect such failures and reconnect
to the database server without exposing this problem to the application
code?Not right now. You can log an enhancement request with our bug database:
http://bugzilla.solarmetric.com/

Similar Messages

Help! JDBC connection pooling lookup in Web server

Hi,
I have a probelm looking up a JDBC Resource
whenever I try to do that I got the message saying:
"sourceWEB3885: Name jdbc is not bound in this Context "
I have created a connection pool and JDBC Resource
<JDBCCONNECTIONPOOL name="mypool" datasourceclassname="oracle.jdbc.pool.OracleDataSource" steadypoolsize="8" maxpoolsize="32" poolresizequantity="2" idletimeout="300" maxwaittime="60000" connectionvalidationrequired="on" connectionvalidationmethod="auto-commit" validationtablename="test_table" failallconnections="off" isolationlevelguaranteed="on" transactionisolationlevel="read-uncommitted">
<PROPERTY name="user" value="user"/>
<PROPERTY name="URL" value="jdbc:oracle:thin:@10.10.10.10:1521:mydb"/>
<PROPERTY name="password" value="password"/>
</JDBCCONNECTIONPOOL>
<JDBCRESOURCE jndiname="jdbc/mypoolds" poolname="mypool" enabled="true"/>
I tried to lookup the data Resources like this:
ic.lookup("java:comp/env/jdbc/paspoolds");
I also tried other varaitions like
ic.lookup("paspoolds");
but without any luck.
I'm not sure if the JDBC Resource didn't created properly or I didn't do the lookup properly.
please advice.
thanks.
Ahmed

I'm also getting the:
[11/Nov/2004:16:35:30] warning ( 9818): WEB7103: Exception while binding global resources: javax.naming.NameNotFoundException: WEB3885: Name java:comp is not bound in this Context at org.apache.naming.NamingContext.lookup(NamingContext.java:811)
Running Sun Java System Web Server 6.1...
In sun-web.xml (I put 2 entries - just in case):
<resource-ref>
<res-ref-name>epdmDS</res-ref-name>
<jndi-name>java:comp/env/jdbc/epdmDS</jndi-name>
</resource-ref>
<resource-ref>
<res-ref-name>jdbc/epdmDS</res-ref-name>
<jndi-name>java:comp/env/jdbc/epdmDS</jndi-name>
</resource-ref>
Web.xml:
<resource-ref>
<description> JNDI DataSource </description>
<res-ref-name>epdmDS</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>

</resource-ref>
Java code:
import javax.sql.DataSource;
import javax.naming.InitialContext;
private final static String jdbcPath = "java:comp/env/jdbc/epdmDS";
createDS: {
InitialContext ctx;
// Instantiate data source objects and store in app context
try {
ctx = new InitialContext();
DataSource epdmDS = (DataSource)ctx.lookup( jdbcPath );
sc.setAttribute( "epdmDS", epdmDS );
} catch( Exception e ) {
logErr("EPDMServlet: Cannot create data source for EPDM jdbc path: "+jdbcPath );
break createDS;
server.xml: (I put in 2 just in case...trying to get it to work...)
<JDBCCONNECTIONPOOL name="epdmDS" datasourceclassname="oracle.jdbc.pool.OracleDataSource" steadypoolsize="8" maxpoolsize="32" poolresizequantity="2" idl
etimeout="300" maxwaittime="60000" connectionvalidationrequired="on" connectionvalidationmethod="auto-commit" validationtablename="" failallconnections="off"
transactionisolationlevel="read-uncommitted" isolationlevelguaranteed="off">
<PROPERTY name="User" value="xxx"/>
<PROPERTY name="URL" value="jdbc:oracle:thin:@xxxxx:1525:xxxxx"/>
<PROPERTY name="Password" value="xxx"/>
</JDBCCONNECTIONPOOL>
<JDBCRESOURCE jndiname="jdbc/epdmDS" poolname="epdmDS" enabled="on"/>
<JDBCCONNECTIONPOOL name="epdmDS" datasourceclassname="oracle.jdbc.pool.OracleDataSource" steadypoolsize="8" maxpoolsize="32" poolresizequantity="2" idl
etimeout="300" maxwaittime="60000" connectionvalidationrequired="on" connectionvalidationmethod="auto-commit" validationtablename="" failallconnections="off"
transactionisolationlevel="read-uncommitted" isolationlevelguaranteed="off">
<PROPERTY name="User" value="xxx"/>
<PROPERTY name="URL" value="jdbc:oracle:thin:@xxxxx:1525:xxxxx"/>
<PROPERTY name="Password" value="xxx"/>
</JDBCCONNECTIONPOOL>
<JDBCRESOURCE jndiname="jdbc/epdmDS" poolname="epdmDS" enabled="on"/>
<JDBCRESOURCE jndiname="epdmDS" poolname="epdmDS" enabled="on"/>

JDBC connection pool getting killed in Managed Server

I am running a managed server in a Windows2000 SP2,WebLogic 6.0 SP2, JDK 1.3.1_01
environment
When I start the managed server I get the following error:
Attempting to create Connection Pool for the Pool Registry Entry : perfectFitPool
<Nov 24, 2001 9:03:15 PM EST> <Error> <JDBC Connection Pool> <The pool 'perfectFitPool
was created successfully. But it must be killed because of: creating Admin MBean
on a managed server>
weblogic.common.ResourceException: creating Admin MBean on a managed server
at weblogic.jdbc.common.internal.ConnectionPool.dynaStartup(ConnectionPool.java:540)
at weblogic.jdbc.common.internal.ConnectionPool.createPool(ConnectionPool.java:766)
at weblogic.jdbc.common.internal.ConnectionPool.createPool(ConnectionPool.java:754)
at ConnectionPoolStartupWl6.createDynamicConnectionPool(ConnectionPoolStartupWl6.java:64)
at ConnectionPoolStartupWl6.startup(ConnectionPoolStartupWl6.java:45)
at weblogic.t3.srvr.StartupClassRunner.invokeStartup(StartupClassRunner.java:112)
at weblogic.t3.srvr.StartupClassRunner.invokeClass(StartupClassRunner.java:93)
at weblogic.t3.srvr.StartupClassRunner.run(StartupClassRunner.java:61)
at java.lang.Thread.run(Thread.java:484)
<Nov 24, 2001 9:03:15 PM EST> <Critical> <WebLogicServer> <Failed to invoke startup
class
"ConnectionPoolStartupWl6", weblogic.common.ResourceException: creating Admin
MBean on a managed server>
<Nov 24, 2001 9:03:15 PM EST> <Notice> <WebLogicServer> <WebLogic Server started>
Any idea on what could be wrong.
Thanks in advance,
Adarsh Ronald

Hi Adarsh,
You can not create Admin MBean on managed server. Managed server can
have only cached copies of Admin MBeans with type ConfigMBean.
Could you show us what you do @ ConnectionPoolStartupWl6?
Regards,
Slava Imeshev
"Adarsh Ronald" <[email protected]> wrote in message
news:3c0054eb$[email protected]..
>
I am running a managed server in a Windows2000 SP2,WebLogic 6.0 SP2, JDK1.3.1_01
environment
When I start the managed server I get the following error:
Attempting to create Connection Pool for the Pool Registry Entry :perfectFitPool
<Nov 24, 2001 9:03:15 PM EST> <Error> <JDBC Connection Pool> <The pool'perfectFitPool
was created successfully. But it must be killed because of: creating AdminMBean
on a managed server>
weblogic.common.ResourceException: creating Admin MBean on a managedserver
atweblogic.jdbc.common.internal.ConnectionPool.dynaStartup(ConnectionPool.java
:540)
atweblogic.jdbc.common.internal.ConnectionPool.createPool(ConnectionPool.java:
766)
atweblogic.jdbc.common.internal.ConnectionPool.createPool(ConnectionPool.java:
754)
atConnectionPoolStartupWl6.createDynamicConnectionPool(ConnectionPoolStartupWl
6.java:64)
at ConnectionPoolStartupWl6.startup(ConnectionPoolStartupWl6.java:45)
atweblogic.t3.srvr.StartupClassRunner.invokeStartup(StartupClassRunner.java:11
2)
atweblogic.t3.srvr.StartupClassRunner.invokeClass(StartupClassRunner.java:93)
at weblogic.t3.srvr.StartupClassRunner.run(StartupClassRunner.java:61)
at java.lang.Thread.run(Thread.java:484)
<Nov 24, 2001 9:03:15 PM EST> <Critical> <WebLogicServer> <Failed toinvoke startup
class
"ConnectionPoolStartupWl6", weblogic.common.ResourceException: creatingAdmin
MBean on a managed server>
<Nov 24, 2001 9:03:15 PM EST> <Notice> <WebLogicServer> <WebLogic Serverstarted>
>
Any idea on what could be wrong.
Thanks in advance,
Adarsh Ronald

Welogic 9.2 jdbc connection pool monitoring section not displaying server

Welogic 9.2 managed jdbc connection pool monitoring section not displaying server name. Can you please let me know how can i achive this

Hi,
It happens if the Connectivity is Lost b/w DataBase & WLS Server...In that case in the WLS AdminConsole---DataSource---Monitoring Tab you wont see even the Testing Page with valid datasource to test it.
So please make sure that the N/W connectivity proper....One more thing you can try:
<h3><font color=red>Test-1</font></h3>
You can use *“weblogic.Admin”* utility to Enable and Disable the Pool (DataSource) Just to Confirm whether the dataSource is actually active or not::
Step1). run *"setWLSEnv.sh"* first in the same Shell prompt....then do the following:
Step2). To suspend:
java weblogic.Admin -url t3://localhost:7001 -username weblogic -password weblogic SUSPEND_POOL YourDataSourceName
Step3). To re-enable:
java weblogic.Admin -url t3://localhost:7001 -username weblogic -password weblogic RESUME_POOL YourDataSourceName
To test whether you are getting any Exception or Error while doing this....If yes u are getting any Error or exception then It means there May be some Database connectivity issue...
<h3><font color=red>Test-2</font></h3>
Please use the following Utility to Test the Database connectivity from your WLS Server box:
<font color=maroon>
java -classpath /opt/app/bea/weblogic92mp2/weblogic92/server/lib/weblogic.jar -Dbea.home=/opt/app/bea/weblogic92mp2 utils.dbping ORACLE_THIN DbUserName DBPassword somethingDbUrl.Something.net:1521:dbInstance
</font>
Syntax:
java -classpath /opt/app/bea/weblogic92mp2/weblogic92/server/lib/weblogic.jar -Dbea.home=/opt/app/bea/weblogic92mp2 utils.dbping ORACLE_THIN <DBUserName> <DBPassword> <DBURL>
The above utilty will test the DB Connectivity ...you need to run it from your WLS server Box...
<h3><font color=red>Another Simple Alternative of Test-2</font></h3>
http://jaysensharma.wordpress.com/2010/03/23/testing-datasource-status-using-wlst/
Thanks
Jay SenSharma
http://jaysensharma.wordpress.com (WebLogic Wonders Are Here)

Creating jdbc connection pool in weblogic 8.x server using oracle database

Hi
i am having oracle 9.2.0 and weblogic 8.1. i am new to oracle and jdbc connection pool. can any one explain how to make connection pool in weblogic.
what will be the host name, port number??
can any one explain
regards,
sekar.r

The host name is the name or IP address of the machine running Oracle.
The port number is the port the DBMS is listening on for connection requests.

Issue JDBC connection pool with Glassfish 3.1.2.2 and Oracle XE 11gR2

Hello,
I am experiencing an issue with pinging a JDBC connection Pool.
I installed the following without any warnings or errors:
Operating System: Oracle Enterprise Linux 5
Oracle XE 11gR2 (11.2.0.2.0) database
Glassfish 3.1.2.2
I will refer to the steps I did after the installations
1) In the .profile file of the OS I add the following:
JRE_HOME=/usr/java/jre1.6.0_31; export JRE_HOME
JAVA_HOME=/usr/java/jdk1.6.0_31; export JAVA_HOME
GLASSFISH_DIR=/u01/glassfish3
GLASSFISH_HOME=/u01/glassfish3/glassfish
DERBY_HOME=$GLASSFISH_DIR/javadb
OPEN_MQ_HOME=$GLASSFISH_DIR/mq
PATH=:$JAVA_HOME/bin:$JRE_HOME/bin:$PATH:$HOME/bin:$GLASSFISH_HOME/bin:$DERBY_HOME/bin:$OPEN_MQ_HOME/bin
export GLASSFISH_HOME
export DERBY_HOME
export OPEN_MQ_HOME
export PATH
LD_LIBRARY_PATH=/u01/app/oracle/product/11.2.0/xe/lib; export LD_LIBRARY_PATH
. /u01/app/oracle/product/11.2.0/xe/bin/oracle_env.sh
2) I copied the ojdbc6.jar to the $GLASSFISH_HOME/domains/domain1/lib
3) I login to the Glassfish admin console and created a new JDBC Connection Pool.
Pool Name: ds_orasys
Resource Type: javax.sql.DataSource
Datasource Classname: oracle.jdbc.pool.OracleDataSource
User: [myschema]
Password: [myschema password]
URL: jdbc:oracle:thin:@localhost:1521:xe
When I ping the connection pool I get the following message in the server log:
[#|2012-10-23T12:14:37.069+0300|WARNING|glassfish3.1.2|javax.enterprise.resource.resourceadapter.com.sun.enterprise.connectors.service|_ThreadID=22;_ThreadName=Thread-2;|RAR8054: Exception while creating an unpooled [test] connection for pool [ ds_orasys ], Connection could not be allocated because: Invalid Oracle URL specified|#]
[#|2012-10-23T12:14:37.071+0300|SEVERE|glassfish3.1.2|org.glassfish.admingui|_ThreadID=19;_ThreadName=Thread-2;|RestResponse.getResponse() gives FAILURE. endpoint = 'http://212.205.62.217:4848/management/domain/resources/ping-connection-pool.json'; attrs = '{id=ds_orasys}'|#]
I tried to use different jar files. I used ojdbc6dms.jar and ojdbc14.jar.
I also copied the jar files in the $GLASSFISH_HOME/domains/domain1/lib/ext directory as some people suggested. Still no luck. I keep getting the same error messages in the server.log
Can anybody help me out or point me to the right direction.
Thank you in advance

The error is in the URL. It was in front of my eyes and I couldn't see the error. I skipped the ':' before the '@' when I created the pool. It is working fine now.

JDBC connection pool failures when used by JMS stores

          We are using WebLogic 6.1 sp2. We defined a separate connection pool for use by
          a JMS Store.
          <JDBCConnectionPool Name="sybaseJMSPool"
          Targets="cluster00"
          InitialCapacity="2"
          MaxCapacity="10"
          DriverName="com.sybase.jdbc2.jdbc.SybDriver"
          Properties="[email protected]@;[email protected]@;charset=utf8"
          URL="jdbc:sybase:Tds:@jms.db.host@/@jms.db.name@"/>
          (note that the @xxx@ string are replaced by actual values).
          We are using Sybase Jconnect 5.5 to a Sybase ASE 12.5 database.
          We deployed this configuration on a number of environments (testing, staging,
          ..). The actual hardware and network configuration is different for the different
          system, but the WebLogic domain stays the same regarding this issue.
          On the test system we frequently get the following exceptions:
          <Aug 13, 2002 1:56:04 PM CEST> <Alert> <JMS> <www00-test> <node00>
          <ExecuteThread: '6' for queue: 'JMS.TimerClientPool'> <> <> <040048>
          <JMSServer "JMSServer00", store failure while writing message for topic
          OrderChangeTopic, java.io.IOException: JMS JDBC store, connection pool =
          <sybaseJMSPool>, prefix = <JMS00>: write failed
          java.sql.SQLException: JZ006: Caught IOException:
          com.sybase.jdbc2.jdbc.SybConnectionDeadException: JZ0C0: Connection is already
          closed.
          at com.sybase.jdbc2.jdbc.ErrorMessage.raiseErrorCheckDead
          (ErrorMessage.java:715)
          at com.sybase.jdbc2.tds.Tds.handleIOE(Tds.java:3124)
          at com.sybase.jdbc2.tds.Tds.cancel(Tds.java:1412)
          at com.sybase.jdbc2.tds.Tds.cancel(Tds.java:1341)
          at com.sybase.jdbc2.jdbc.SybStatement.doCancel(SybStatement.java:564)
          at com.sybase.jdbc2.jdbc.SybStatement.updateLoop(SybStatement.java:1672)
          at com.sybase.jdbc2.jdbc.SybStatement.executeUpdate
          (SybStatement.java:1625)
          at com.sybase.jdbc2.jdbc.SybPreparedStatement.executeUpdate
          (SybPreparedStatement.java:91)
          at com.p6spy.engine.logging.P6LogPreparedStatement.executeUpdate
          (P6LogPreparedStatement.java:179)
          at weblogic.jdbc.pool.Statement.executeUpdate(Statement.java:293)
          at weblogic.jms.store.JDBCIOStream.write(JDBCIOStream.java:1246)
          at weblogic.jms.store.StoreRequest.doTheIO(StoreRequest.java:250)
          at weblogic.jms.store.JMSStore.execute(JMSStore.java:182)
          at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
          .>
          java.io.IOException: JMS JDBC store, connection pool = <sybaseJMSPool>, prefix
          = <JMS00>: write failed
          java.sql.SQLException: JZ006: Caught IOException:
          com.sybase.jdbc2.jdbc.SybConnectionDeadException: JZ0C0: Connection is already
          closed.
          at com.sybase.jdbc2.jdbc.ErrorMessage.raiseErrorCheckDead
          (ErrorMessage.java:715)
          at com.sybase.jdbc2.tds.Tds.handleIOE(Tds.java:3124)
          at com.sybase.jdbc2.tds.Tds.cancel(Tds.java:1412)
          at com.sybase.jdbc2.tds.Tds.cancel(Tds.java:1341)
          at com.sybase.jdbc2.jdbc.SybStatement.doCancel(SybStatement.java:564)
          at com.sybase.jdbc2.jdbc.SybStatement.updateLoop(SybStatement.java:1672)
          at com.sybase.jdbc2.jdbc.SybStatement.executeUpdate
          (SybStatement.java:1625)
          at com.sybase.jdbc2.jdbc.SybPreparedStatement.executeUpdate
          (SybPreparedStatement.java:91)
          at com.p6spy.engine.logging.P6LogPreparedStatement.executeUpdate
          (P6LogPreparedStatement.java:179)
          at weblogic.jdbc.pool.Statement.executeUpdate(Statement.java:293)
          at weblogic.jms.store.JDBCIOStream.write(JDBCIOStream.java:1246)
          at weblogic.jms.store.StoreRequest.doTheIO(StoreRequest.java:250)
          at weblogic.jms.store.JMSStore.execute(JMSStore.java:182)
          at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
          at weblogic.jms.store.JDBCIOStream.throwIOException
          (JDBCIOStream.java:1213)
          at weblogic.jms.store.JDBCIOStream.write(JDBCIOStream.java:1256)
          at weblogic.jms.store.StoreRequest.doTheIO(StoreRequest.java:250)
          at weblogic.jms.store.JMSStore.execute(JMSStore.java:182)
          at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
          at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
          Before that this message appeared:
          <Aug 13, 2002 11:31:16 AM CEST> <Error> <ConnectionManager> <www00-test>
          <node00> <ExecuteThread: '26' for queue: 'default'> <> <> <000000>
          <Closing: 'weblogic.rjvm.t3.T3JVMConnection@795af6' because of: 'Server
          received a message over an uninitialized connection: 'JVMMessage from: 'null'
          to: '-4555218188801970213S:192.168.13.1:[7001,7001,7002,7002,7001,7002,-
          1]:ADIS:node00' cmd: 'CMD_REQUEST', QOS: '101', responseId: '1',
          invokableId: '287', flags: 'JVMIDs Not Sent, TX Context Not Sent', abbrev
          offset: '34'''>
          This problem did not occur on another system which was used during a 2 day stress
          testing session.
          It seems that the problem occurs after a period in which no user request where
          made. The user requests trigger EJB's that start sending JMS messages.
          When the problem occurs, the JMS messaging systems seems to lock up as no messages
          are received anymore by the different listeners (MDBs).
          Undeploying and redeploying the JBDC connection pool solves the problem. This
          solution is unacceptable in case of a production system.
          A similarly defined connection pool, which is used by the EJBs to make database
          connection, does not manifest this problem.
          <JDBCConnectionPool Name="sybasePool"
          Targets="cluster00"
          InitialCapacity="10"
          CapacityIncrement="5"
          MaxCapacity="50"
          PreparedStatementCacheSize="150"
          DriverName="com.sybase.jdbc2.jdbc.SybDriver"
          Properties="[email protected]@;[email protected]@;JCONNECT_VERSION=6;charset=utf8"
          URL="jdbc:sybase:Tds:@db.host@/@db.name@"/>
          The JDBC connection pool is used as follows by the JDBC store
          <JMSJDBCStore ConnectionPool="sybaseJMSPool" Name="JDBCStore00" PrefixName="JMS00"/>
          <JMSServer Name="JMSServer00" Store="JDBCStore00" Targets="node00">
          <JMSTopic JNDIName="ADIS.JMSError" JNDINameReplicated="false" Name="ErrorTopic"/>
          <JMSTopic JNDIName="ADIS.Status"
          Name="StatusTopic" RedeliveryDelayOverride="300000"/>
          <JMSTopic JNDIName="ADIS.OrderChange" JNDINameReplicated="false"
          Name="OrderChangeTopic" RedeliveryLimit="3"/>
          </JMSServer>
          Turning on the "Test Reserved Connection" with a appropriate test table does not
          help.
          Some sources on the internet tell us that JZ0C0 errors in the Jconnect driver
          can be related to network problems. Nevertheless the connection pool should be
          able to cope with this.
          Can you provide any solution for this ? Or give us hints what can cause the problem


Zhenhao Qi wrote:
thanks! Joe.
The SQL statement itself can no longer be simplified, the long excuation time is due to the database size and complicated Select criteria. I can easily reproduce the problem by using this SQL. I tried "BEA's Oracle driver (Type 4): Version 8.1.7,9.0.1,9.2.0". the question can be dissect into 2 pieces:
1) why the jdbc connection (using oracle.jdbc.OracleDriver) won't return anything if the SQL execution time > 5min, that is probably the Oracle's problem
2) why the occupied connection pool won't release even I set "Statementtimeout=600", this is Weblogic's problem.
ZhenhaoHi. Yes, (1) is oracle's problem. (2) may also be. The JDBC spec has very few
allowances for one thread to interrupt a second thread's JDBC call. If we
transmit your timeout request by calling setQueryTimeout() on the oracle
statement, and if you have a weblogic-controlled transaction we call
Statement.cancel() on any ongoing statement, we end up relying on whether
the Oracle driver implements and responds to those calls.
Are you doing weblogic-controlled transactions? Are you/can you
call Statement.setQueryTimeout() on your statements, or are these
generated JDBC queries?
If you can duplicate the problem using the weblogic.jdbc.oracle.OracleDriver
we have some other debug avenues. This would be good even if you really
want to use the thin driver, because we will do the same JDBC calls to
either driver, and the debug would prove (if) we set up a query timeout
and if we call cancel(). If we do, then we can know that it is the Oracle
driver failing in these regards.
Joe

Issues with JDBC Connection Pooling

Hi all,
I'm experiencing some unexpected behaviour when trying to use JDBC Connection Pooling with my BC4J applications.
The configuraiton is -
Web Application using BC4J in local mode
Using Default Connection Stagegy
Stateless Release Mode
Retrieving Application Modules using Configuration.createRootApplicationModule( am , cf );
Returning Application Modules using Configuration.releaseRootApplicationModule( am, false );
Three application modules
AppModuleA - connects to DatabaseConnection1
AppModuleB - connects to DatabaseConnection2
AppModuleC - connects to DatabaseConnection2
My requirement is to -
Use App Module Pooling and have individual pool for each Application Module
Use JDBC Pooling and have individual pool for each Database connection
Note: All configuration was achieved in design mode (i.e. right clicking AppModule->Configurations...)
1. Initial approach -
In the configuration for each Application Module I specified the connection type as 'JDBC Datasource' and specified to approriate datasource.
Tried setting doConnecitonPooling to 'true' as well as 'false'
In the data-sources.xml I specified all the appropriate info including min-connections and max-connections.
I would expect, with the above config that BC4J would use OC4J's built in JDBC connection pooling.
2. Second approach -
In the configuration for each Application Module I specified the connection type as JDBC URL.
In the configuration I specified doConnectionPooling = 'true' as well as the max connection, max available and min available
What I experienced in both cases was that the max connections seem to be ignored as the number of connection as reported by the database (v$session) was exceeded by more than 10.
In addition to this once the load was removed the number of JDBC connecitons did not drop (I would have expected it to drop to max available connections)
My questions are -
1. When specifying to use a 'JDBC Datasource' style of connection, is it in fact OC4J that is then responsible for pooling JDBC connections? And in this case should BC4J's doConnectionPooling parameter be set to true or false?
2. Are there any known issues with the use of the JDBC Conneciton Pool as stated by the above to approaches?

Thanks for the additional info. Please see my comments. below.
Sorry should have been more specififc -
1. Is each application pool using a different JDBC user? You mentioned DatabaseConnection1 and DatabaseConnection2
above; are these connections to different schemas / users? If so, BC4J will create a separate connection pool for each
JDBC user. Each connection pool will have its own maximum pool size.
Each 'DatabaseConnection' refers to a different database, actually hosted on a seperate physical server, different
schema and different user.BC4J will maintain a separate connection pool for each permutation of JDBC URL / schema. If each user is connecting
to a different DB instance then I would expect no greater than 10 DB sessions. However, if a DB instance is hosting
more than user then I would expect greater than 10 DB sessions (though still no more than 10 DB sessions per user).
2. Are all the v$session sessions related to the JDBC clients? There should be at least one additional database
session which will be related to the session that is querying v$session.
When querying the v$session table I specifically look for connections from the user in quesiton and from the machine
name in question and in doing so eliminate the database system's connections, as well as the query tools'
connection. One area I'm not sure about is the connection BC4J uses to write to its temporary tables. I am using
Stateless release mode and have not explicetly stated to save to the database but I'm wondering if it still does if so
and how does it come into the equation with max connections?BC4J's internal connections are also pooled and the limits apply as mentioned above. So, if you have specified
internal connection info for a schema which is different than the users above I would expect the additional conns.
One helpful diagnostic tool, albeit programmatic, might be to print the information about the connection pools after
your test client(s) have finished. This may be accomplished as follows:
// get a reference to the BC4J connection pool manager
import oracle.jbo.server.ConnectionPoolManagerFactory;
import oracle.jbo.server.ConnectionPoolManagerImpl;
import oracle.jbo.pool.ResourcePool;
import java.io.PrintWriter;
import java.util.Enumeration;
// get the ConnectionPoolManager. assume that it is an instance of the supplied manager
ConnectionPoolManagerImpl mgr = (ConnectionPoolManagerImpl)ConnectionPoolManagerFactory.getConnectionPoolManager();
Enumeration keys = mgr.getResourcePoolKeys();
PrintWriter pw = new PrintWriter(System.out, true);
while (keys.hasMoreElements())
Object key = keys.nextElement();
ResourcePool pool = (ResourcePool)mgr.getResourcePool(key);
System.out.println("Dumping pool statistics for pool: " + key);
pool.dumpPoolStatistics(pw);
}

Weblogic 7.0 , MySQL 3.23 JDBC Connection Pools

i am using weblogic 7.0 and MySQL 3.23 and right now my objective is to create,
configure and test a JDBC
connection pool using the Administrative console.
Here is what i have done till now
- set the classpath of the MySQL driver in the startWLS.cmd like this
SET MYSQL_DRIVER=C:\mysqldriver\mysql-connector-java-2.0.14\mysql-connector-java-2.0.14-bin.jar
set CLASSPATH=%MYSQL_DRIVER%;%CLASSPATH%
- using the weblogic administrative console i have created a new connection pool
named as
testpool.
- Here is what i have in the testpool general tab
Name: testpool
URL: jdbc:mysql//localhost:3306/test (test is the name of the database in mysql)
Driver Classname: org.gjt.mm.mysql.Driver
I have not entered any Properties, ACL Name, Password or Open String Password.
- Now i go the the Testing tab and enter a name of a table in my test database
and click on Apply
and on the command window i am getting the following exception
java.sql.SQLException No suitable driver
Thanks in advance,
Ashish

Thanks a lot Slava. After reading your mail and the post i was able to get it working.
"Slava Imeshev" <[email protected]> wrote:
Hi Ashish,
I figured out what's the problem. URL in the connection pool
definition is malformed. It's
jdbc:mysql//localhost:3306/test
while the correct one should have colon after mysql:
jdbc:mysql://localhost:3306/test
Regards,
Slava Imeshev
"Ashish Sureka" <[email protected]> wrote in message
news:[email protected]...
I am sorry, the program that i posted here is not comming properlyformatted but
i am able to run a simple java program that connects to MySQL and alsoa
servlet
that connects to the MySQL. The only problem i am having is includingthe
MySQL
driver jar files to the weblogic server classpath.
Thanks,
Ashish.
"Ashish Sureka" <[email protected]> wrote:
Hello Joseph Weinstein,
Actually, i already tried the same approach that you have mentioned
in
your reply
before i posted my message here. Following is the program that i use
to check
MySQL connection.
import java.sql.*;
public class MySQLConnect
public static void main(String[] args) throws Exception
try {
Class.forName ( "org.gjt.mm.mysql.Driver" );
System.out.println ( "MySQL Driver Found" );
} catch ( java.lang.ClassNotFoundException e ) {
System.out.println("MySQL JDBC Driver not found ... ");
throw ( e );
String url = "";
Connection con = null;
try {
url = "jdbc:mysql://" + "localhost:3306" + "/" + "test";
con = DriverManager.getConnection(url);
System.out.println("Connection established to " + url + "");
} catch ( java.sql.SQLException e ) {
System.out.println("Connection couldn't be established to " + url);
String sqlStatement = "SELECT * FROM testtable";
try {
Statement s = con.createStatement();
s.execute (sqlStatement);
s.close ( );
} catch ( SQLException e ) {
System.out.println ( "Error executing sql statement" );
con.close();
The classpath that i use to run this program is
SET PATH=C:\bea\jdk131_03\bin
SETCLASSPATH=C:\bea\jdk131_03\jre\lib\rt.jar;C:\bea\weblogic700\ebcc\lib\ext\se
rvlet.jar;C:\CSC413\Demos\HelloApp\HelloAppJAR
SET CLASSPATH=%CLASSPATH%;C:\bea\weblogic700\server\lib\weblogic.jar
SETMYSQL_DRIVER=C:\mysqldriver\mysql-connector-java-2.0.14\mysql-connector-java
-2.0.14-bin.jar
set CLASSPATH=.;%MYSQL_DRIVER%;%CLASSPATH%
I have also written a Servlet which checks the MySQL connection. For
the servlet
i added the MySQL driver jar files in the WEB-INF/lib directory ofthe
servlet
web application and it is working fine.
do you want me to attach the startWLS.cmd file that i changed to include
the MySQL
driver classpath.
Thanks for your replies,
Ashish.
Joseph Weinstein <[email protected]> wrote:
Ashish Sureka wrote:
When i start the weblogic server using the command prompt by executingthe startWLS.cmd,
i can see the classpath the server is using on the command window
and
that includes
the jar file for the MySQL driver but still it is throwing a
SQLException
and
saying that No Suitable driver.
How do i include a external library or jar file on the weblogic
server's
classpath.
is there a specific directory where i should put the MySQL driver
jar
file .
Thanks,
Ashish.No. Let's simplfy the problem. Please run a tiny standalone Java
program
that
just makes a JDBC connection to your MySQL DBMS, with no weblogic
code in the picture. When you succeed at this, show me the CLASSPATH
and
PATH of the shell that ran the program successfully, and show methe
few lines
of code that made the connection. Then we will know the problem.It
may
be that
the URL you're passing to the pool is not exactly correct for that
driver.
Joe
Joseph Weinstein <[email protected]> wrote:
Ashish Sureka wrote:
i am using weblogic 7.0 and MySQL 3.23 and right now my objective
is
to create,
configure and test a JDBC
connection pool using the Administrative console.
Here is what i have done till now
- set the classpath of the MySQL driver in the startWLS.cmd
like
this
SET
MYSQL_DRIVER=C:\mysqldriver\mysql-connector-java-2.0.14\mysql-connector-java
-2.0.14-bin.jar
set CLASSPATH=%MYSQL_DRIVER%;%CLASSPATH%
- using the weblogic administrative console i have created anew
connection
pool
named as
testpool.
- Here is what i have in the testpool general tab
Name: testpool
URL: jdbc:mysql//localhost:3306/test (test is the name of
the
database
in mysql)
Driver Classname: org.gjt.mm.mysql.Driver
I have not entered any Properties, ACL Name, Password or
Open
String
Password.
- Now i go the the Testing tab and enter a name of a table in
my
test
database
and click on Apply
and on the command window i am getting the following exception
java.sql.SQLException No suitable driverWatch the first lines that the server prints out when the script
starts
it. The script
shows the classpath that was constructed for the server. It is
likely
that you need
to do something else to ensure your driver is really in the classpath
the server uses.
Joe
Thanks in advance,
Ashish

JDBC Connection pools and clusters (is max connection for entire cluster?)

Hi,
Quick question.
When using JDBC connection pools in WAS 6.40 (SP13) in a clustered environment. Are the max connections the number
a)Each application server can use
b)The entire cluster can use
Would believe a), but I'd like it confirmed from someoneelse

Hi Dagfinn,
your assumption is correct. Therefore, in a cluster environment you'd need to make sure the DB can open <i>Number of nodes X max connections</i>.

Replace Quotes, Connection Pooling, and Sun Web Server with MySQL, Oracle

This is code I use to insert data into my MySQL and Oracle databases.
I takes care of quotes and shows use of context, i.e. when you use Sun Web Server's
ConnectionPooling. This code works. Feel free to reply if you have questions on how to set up connection pooling using Sun Web Server 6.1SP - it took quite a long time to learn and I couldn't find much information throughout the web, so I hope this helps...
This is not a question and I am not looking for an answer, but please post comments or suggestions.
dailysun
This is in one class where I have a hashtable containing the
column name / value pairs that I want to enter into my table.
This class simply creates the SQL string from the values in the
hashtable. It then passes that hashtable including the database
name to a class which executes that sql statement (second code
portion).
/* Insert data into sf_parts. Create the column strings from
         * the provided hash table. Be sure to parse out hash elements which
         * are used for the createTemplate process
        StringBuffer values = new StringBuffer();
        StringBuffer fields = new StringBuffer();
        Enumeration keys = fieldHash.keys();
        while(keys.hasMoreElements()){
            Object currentKey = keys.nextElement();
                String fieldValue = (String) fieldHash.get(currentKey);
                if(values.length() >0){
                    values.append(",");
                values.append("'"+fieldValue.replaceAll("'","''")+"'"); // Takes care of quotes and various other special characters!
                if(fields.length() >0){
                    fields.append(",");
                fields.append(currentKey);
        sql = "INSERT INTO myTable (" + fields.toString() + ") VALUES (" + values.toString() + ");";
        String insertResult = caq.getInsertDelete(sql,"myDatabaseName"); // your database name is defined in web.xml and sun-web.xml when you use Sun Web Server's Connection Pooling.
        returnValue += "<br><br><b>Rows inserted into table(myTable): </b>" + insertResult + "<br>\n";
        And, like I describe above, this method executes the sql statement.
     * Takes care of insert, update and delete requests.
     * Must have set both dbName as well as the sql String.
     * Will return number of rows affected as String.
     * @return String Number of rows affected
     * @exception SQLException
     * @exception Exception
    public String getInsertDelete() {
        checkData(); // this simply checks if the variables dbName and sql are not empty ;-)
        InitialContext initContext = null;
        int rv = 0;
        try{
            // Get connection from configured pool
            initContext = new InitialContext();
            source = (DataSource) initContext.lookup("java:comp/env/jdbc/" + dbName); // I have this set up in web.xml and sun-web.xml (I use Sun Web Server 6.1SP which does connection pooling for me)
            conn = source.getConnection();
            if(conn != null){
                stmt = conn.createStatement();
                rv = stmt.executeUpdate(sql);
        }catch (SQLException e){
            // do something
        }catch (Exception e){
            // do something
        }finally{
            try{
                stmt.close();
            }catch(Exception e){
                // do something
            try{
                conn.close();
            }catch(Exception e){
                // do something
            try{
                initContext.close();
            }catch(Exception e){
                // do something
        return rv+"";
    }

This is code I use to insert data into my MySQL and
Oracle databases.
I takes care of quotes and shows use of context, i.e.
when you use Sun Web Server's
ConnectionPooling. This code works. Feel free to
reply if you have questions on how to set up
connection pooling using Sun Web Server 6.1SP - it
took quite a long time to learn and I couldn't find
much information throughout the web, so I hope this
helps...
This is not a question and I am not looking for an
answer, but please post comments or suggestions.Using prepared statements would mean that you wouldn't have to worry about quotes.
You should be closing the result set.
You are handling all fields as strings. That won't work with time fields and might not work for numeric fields.
Presumably most of your variables are member variables. They should be local variables because that is the scope of the usage.
You must do something with the exceptions.
Hashtables although convienent mean that problems with usage can only be resolved at run time rather than compile time.

Setting up Connection Pool in sun app server 8.1 with SQL server 2000

Hello,
I am trying to set up a connection pool & data source for SQL server 2000 (MSDE 2000).
Here is what I attempted to do:
I have a pool data source in a jar file called poll.jar and I copied it to C:\sun\Appserver\lib (Install dir\lib)
com.microsoft.mspool.PoolDataSource is the pool data source class.
In the Admin console, JDBC>Connection pools. Selected NEW and made the following entries.
GENERAL SETTINGS
Name: MsPool
Datasource class name : com.microsoft.mspool.PoolDataSource
Resource type: javax.sql.DataSource
POOL SETTINGS: default values
CONNECTION VALIDATION: default values
TRANSACTION ISOLATION: default values
PROPERTIES:
DataSourceName:PoolDataSource
NetworkProtocol:tcp
DatabaseName: myDB
Password:User specific
user:User specific
server: localhost
PortNumber:1433
I get the following error when I ping:
Operation 'pingConnectionPool' failed in 'resources' Config Mbean. Target exception message: Class name is wrong or classpath is not set for : com.microsoft.mspool.PoolDataSource.
Can any one help me if have a solution?
Thanks in advance.
mag

You need to copy your jar to ${AS_INSTALL}/domains/domain1/lib/ext (replace domain1 by your
domain). Another option is to leave the jar in ${AS_INSTALL}/lib and add a entry in the classpath-suffix element of your domain.xml.
thanks,
:aditya

WLS 10.0 JDBC connection pool shrink not working

We seem to be having a problem with jdbc connection pools not shrinking. In the connection pool properties in the WLS console we have:
Initial Capacity 4
Maximum Capacity 15
Shrink Frequency 900
However when I look at the underlying xml config file (see below) the last two values above are not present in the config!
Any ideas what is going on here?
thankyou,
Chris
<?xml version='1.0' encoding='UTF-8'?>
<jdbc-data-source xmlns="http://www.bea.com/ns/weblogic/90" xmlns:sec="http://www.bea.com/ns/weblogic/90/security" xmlns
:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:wls="http://www.bea.com/ns/weblogic/90/security/wls" xsi:schemaLo
cation="http://www.bea.com/ns/weblogic/920 http://www.bea.com/ns/weblogic/920.xsd">
<name>mdmrDataSource</name>
<jdbc-driver-params>
<url>jdbc:oracle:thin:@(DESCRIPTION = (ADDRESS = (PROTOCOL = TCP) (HOST = xxxrac01-vip.nzlxxx01.com) (PORT = 1521))
(ADDRESS = (PROTOCOL = TCP) (HOST = xxxrac02-vip.nzlxxx01.com) (PORT = 1521)) (LOAD_BALANCE = yes) (CONNECT_DATA =(SERVE
R = DEDICATED) (SERVICE_NAME = xxxrac.nzlami01.com)))</url>
<driver-name>oracle.jdbc.pool.OracleDataSource</driver-name>
<properties>
<property>
<name>user</name>
<value>xxx_comms</value>
</property>
<property>
<name>fastConnectionFailoverEnabled</name>
<value>true</value>
</property>
<property>
<name>implicitCachingEnabled</name>
<value>true</value>
</property>
<property>
<name>connectionCachingEnabled</name>
<value>true</value>
</property>
<property>
<name>ONSConfiguration</name>
<value>nodes=xxxrac1:6251,xxxrac2:6251</value>
</property>
</properties>
<password-encrypted>xxx</password-encrypted>
</jdbc-driver-params>
<jdbc-connection-pool-params>
<initial-capacity>4</initial-capacity>
<test-connections-on-reserve>true</test-connections-on-reserve>
<test-table-name>SQL SELECT 1 FROM DUAL</test-table-name>
</jdbc-connection-pool-params>
<jdbc-data-source-params>
<jndi-name>jdbc/XXXX</jndi-name>
<global-transactions-protocol>None</global-transactions-protocol>
</jdbc-data-source-params>
</jdbc-data-source>

You are right that the XML seems to lask those other settings... Did you
sae those settings from the console?
This is what's in one of mine....
<jdbc-connection-pool-params>
<initial-capacity>0</initial-capacity>
<max-capacity>300</max-capacity>
<shrink-frequency-seconds>900</shrink-frequency-seconds>

ResultSet problem with a jdbc connection pool implementation

Hi
I'm trying to use jdbc connection pool in my java application (js2e 1.4.0_01)
from the example at http://www.developer.com/tech/article.php/626141
In my main() code, in addition to JDBCConnection, JDBCConnectionImpl and JDBCPool classes, i use
JDBCConnection conn;
conn = new JDBCConnection(dbName);
// make a statement
sqlString = "SELECT........."
ResultSet rs = null;
rs = conn.sendRequest(sqlString, rs);
// print result
while (rs.next()) {
Unfortunately i get an error like "ResultSet is closed" in the line corresponding to rs.next. The error disappears if i remove the line
stmt.close();
in the method sendRequest of the JDBCConnectionImpl class.
1) Does anybody knows the solution?
2) How to close all connections?
Thanks you in advance.

Hi ,
You are closing the statement and then trying to use resultset , which is not going to work .So close then statment after using resultset .Ideally the code should be like this
try {
conn = // get the connection
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
while ( rs.next()){
// do something
catch (Exception ex) {
finally {
try {
if (rs != null)
rs.close();
if (pstmt != null)
pstmt.close();
if(conn!=null )
conn.close();

View # of current Connection of jdbc connection pool

Do you guy know of ANY METHODS of viewing # of current database Connection of jdbc connection pool in SUNAPP SERVER?
for example i have jdbc/Dashboard Connection Pool in SUNAPP SERVER and I wanted to view, at any point of time, how many connection database that it is being utilized during that time. The reason I wanted to see the # of currection jdbc connection is because my Max (400connections) ran out or hanging really long period of time.
Thanks,
Kelvin

There is no way currently to do this

JDBC Connection pool recovery after DB server restart

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