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();
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.>
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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
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1]:ADIS:node00' cmd: 'CMD_REQUEST', QOS: '101', responseId: '1',
invokableId: '287', flags: 'JVMIDs Not Sent, TX Context Not Sent', abbrev
offset: '34'''>
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Undeploying and redeploying the JBDC connection pool solves the problem. This
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<JDBCConnectionPool Name="sybasePool"
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InitialCapacity="10"
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MaxCapacity="50"
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DriverName="com.sybase.jdbc2.jdbc.SybDriver"
Properties="[email protected]@;[email protected]@;JCONNECT_VERSION=6;charset=utf8"
URL="jdbc:sybase:Tds:@db.host@/@db.name@"/>
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<JMSServer Name="JMSServer00" Store="JDBCStore00" Targets="node00">
<JMSTopic JNDIName="ADIS.JMSError" JNDINameReplicated="false" Name="ErrorTopic"/>
<JMSTopic JNDIName="ADIS.Status"
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<JMSTopic JNDIName="ADIS.OrderChange" JNDINameReplicated="false"
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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:
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I know there is another solution by JNDI if we develop servlet application. Tomcat provides an easy way to setup JNDI database pooling source that is available to JSP and Servlet. but how about a standalone application? I mean there is no JNDI service provider. it seems a good solution to combine Commons DBCP with JNID or Apache's Naming (http://jakarta.apache.org/commons/dbcp/index.html). but still, I don't know how to keep pool management instance alive all the time. once we create a JNDI enviroment or naming, if it will save in the memory automatically all the time? or we must implement it as a daemon thread?
any hint will be great apprieciated!
SamTo my knoledge the pool management instance stays alive as long as the pool is alive. What you have to figure out is how to keep a reference to it if you need to later access it.
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con.close();
catch( SQLException e )
System.out.println( "could not get JDBC connection: " + e );
catch( Exception e )
System.out.println( "could not load JDBC driver: " + e );
7. when I run the Java program (java Test), I got
the message:
could not load JDBC driver: java.lang.ClassNotFoundException: org.gjt.mm.mysql.Driver
What am I missing?Hi,
I missed to specify test in my last post.
Try running your program by explicitly setting the classspath when
running your program . java -classpath c:\mysql-connector-java-3.1.0-alpha-bin.jar test
Make sure your jar file contains org.gjt.mm.mysql.Driver class -
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> -
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,
AshishThanks 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 -
Xa-problems when releasing jdbc connection
We have a very strange problem with our WL setup.
Weblogic 8.1.4 (2 cluster nodes)
Oracle 9i stand alone db (although tested on RAC with 2 nodes)
The application architecture is quite complicated, with several EJB-applications that communicate via JMS and RMI. Everything (except logging) runs under xa-transactions that span multiple applications. We use both xa (for everything but logging) and non-xa jdbc connection pools (Oracle thin driver).
When we release a jdbc connection then the following node manager log entry is written:
<Mar 13, 2006 11:11:02 AM UTC> <Error> <JDBC> <BEA-001112> <Test "SELECT 1 FROM DUAL" set up for pool "myPoolXA" failed with exception: "oracle.jdbc.xa.OracleXAException".>
<Mar 13, 2006 11:11:02 AM UTC> <Error> <JDBC> <BEA-001035> <The following error has occured: XA operation failed : java.lang.NullPointerException
at weblogic.jdbc.wrapper.VendorXAResource.rollback(VendorXAResource.java:78)
at weblogic.jdbc.jta.DataSource.rollback(DataSource.java:1047)
at weblogic.transaction.internal.XAServerResourceInfo.rollback(XAServerResourceInfo.java:1358)
at weblogic.transaction.internal.XAServerResourceInfo.rollback(XAServerResourceInfo.java:687)
at weblogic.transaction.internal.ServerSCInfo.startRollback(ServerSCInfo.java:729)
at weblogic.transaction.internal.ServerTransactionImpl.localRollback(ServerTransactionImpl.java:1909)
at weblogic.transaction.internal.ServerTransactionImpl.globalRollback(ServerTransactionImpl.java:2592)
at weblogic.transaction.internal.ServerTransactionImpl.internalRollback(ServerTransactionImpl.java:385)
at weblogic.transaction.internal.ServerTransactionImpl.rollback(ServerTransactionImpl.java:364)
at weblogic.ejb20.internal.BaseEJBObject.postInvoke(BaseEJBObject.java:279)
at weblogic.ejb20.internal.StatelessEJBObject.postInvoke(StatelessEJBObject.java:140)
at com.xx.myapp.ejb.MessageMgmt_s1i1u8_EOImpl.processMessage(MessageMgmt_s1i1u8_EOImpl.java:56)
at com.xx.myapp.ejb.MessageMgmt_s1i1u8_EOImpl_CBV.processMessage(Unknown Source)
at com.xx.myapp.ejb.TextMessageReceiverBean.onMessage(TextMessageReceiverBean.java:120)
at weblogic.ejb20.internal.MDListener.execute(MDListener.java:370)
at weblogic.ejb20.internal.MDListener.onMessage(MDListener.java:262)
at weblogic.jms.client.JMSSession.onMessage(JMSSession.java:2678)
at weblogic.jms.client.JMSSession.execute(JMSSession.java:2598)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
As we understand the message this means that the jdbc resource wrapper crashes with a NPE.
Are there any hints on this situation ?
Regards
Nikolaus RummAdditional information:
We use Hibernate as the persistence layer. The problem arises when the application detects a business problem and calls setRollbackOnly() on the session bean's ejb context, followed by a "throw ApplicationException" (extends java.lang.Exception).
When we use unchecked exceptions for business exceptions (which violates the EJB spec) everything works fine. -
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 RonaldHi 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
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