Unable to get Results using Connection Pool

Hi All,
I have been trying to create JDBC connection pooling provided by the Apache Tomcat 4.0 with MySQL 4.0.16-nt at http://jakarta.apache.org/tomcat/tomcat-4.1-doc/jndi-datasource-examples-howto.html and my configuration is as follows
server.xml
<Context path="/DBTest" docBase="DBTest"
debug="5" reloadable="true" crossContext="true">
<Logger className="org.apache.catalina.logger.FileLogger"
prefix="localhost_DBTest_log." suffix=".txt"
timestamp="true"/>
<Resource name="jdbc/TestDB"
auth="Container"
type="javax.sql.DataSource"/>
<ResourceParams name="jdbc/TestDB">
<parameter>
<name>factory</name>
<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
</parameter>

<parameter>
<name>maxActive</name>
<value>100</value>
</parameter>

<parameter>
<name>maxIdle</name>
<value>30</value>
</parameter>

<parameter>
<name>maxWait</name>
<value>10000</value>
</parameter>

<parameter>
<name>username</name>
<value>javauser</value>
</parameter>
<parameter>
<name>password</name>
<value>javadude</value>
</parameter>

<parameter>
<name>driverClassName</name>
<value>org.gjt.mm.mysql.Driver</value>
</parameter>

<parameter>
<name>url</name>
<value>jdbc:mysql://localhost:3306/javatest?autoReconnect=true</value>
</parameter>
</ResourceParams>
</Context>
web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<description>MySQL Test App</description>
<resource-ref>
<description>DB Connection</description>
<res-ref-name>jdbc/TestDB</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
</web-app>
test.jsp
<jsp:useBean id="foo" class="foo.DBTest" scope="page" />
<html>
<head>
<title>DB Test</title>
</head>
<body>
<%
foo.DBTest tst = new foo.DBTest();
tst.init();
%>
<h2>Results</h2>
Foo <%= tst.getFoo() %>
Bar <%= tst.getBar() %>
</body>
</html>
DBTest.java package
package foo;
import javax.naming.*;
import javax.sql.*;
import java.sql.*;
public class DBTest {
String foo = "Not Connected";
int bar = -1;
public void init() {
try{
Context ctx = new InitialContext();
if(ctx == null )
throw new Exception("Boom - No Context");
DataSource ds =
(DataSource)ctx.lookup(
"java:comp/env/jdbc/TestDB");
if (ds != null) {
Connection conn = ds.getConnection();
if(conn != null) {
foo = "Got Connection "+conn.toString();
Statement stmt = conn.createStatement();
ResultSet rst =
stmt.executeQuery(
"select id, foo, bar from testdata");
if(rst.next()) {
foo=rst.getString(2);
bar=rst.getInt(3);
conn.close();
}catch(Exception e) {
e.printStackTrace();
public String getFoo() { return foo; }
public int getBar() { return bar;}
Now when I am trying to run this on browser, everything goes fine except it doesn't show the expected results, instead of that it shows following in the browser:-
Results
Foo Not Connected
Bar -1
Can anybody help me out as to why I am getting such result while everything is right from my side. Is the program unable to connect to the database or it is not supporting the JDBC version that I am using.
Thanks in advance
Regards
Vikas

I've seen cases where NOT using the ResourceParams section, and instead using attributes in the Resource section will fix this. Don't know why.
i.e.
Instead of using:
<parameter>
<name>driverClassName</name>
<value>org.gjt.mm.mysql.Driver</value>
</parameter>use the driver attribute of the Resource tag:
<Resource name="jdbc/TestDB"
auth="Container"
type="javax.sql.DataSource"
driver="org.gjt.mm.mysql.Driver"/>Also note...I don't use the org.gjt.mm.mysql.Driver class (which is in the distribution), I use com.mysql.jdbc.Driver. Any reason you don't? This could be part of it. I don't really know.

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Repost-Best way of using connection pooling

I am reposting this, seems best suitable in this category.
I am using Eclipse 3.1 along with Tomcat 5.0, MySQL 4.1, J2EE1.4. I could set up the JNDI Dataresource connection pooling and tested with small test servlet. Now thinking of having common methods for getting connection / closing / commiting ....etc.
I wrote following. [Please let me know whether it is correct way of doing it - as i am not very sure]
package common;
import java.sql.*;
import javax.sql.*;
import javax.naming.*;
import org.apache.log4j.Logger;
public final class connectionManager {
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//JNDI DataSource connection pooling
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               Context initContext = new InitialContext();
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     public static void closeResources(ResultSet oRS, PreparedStatement pstmt) throws SQLException
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               oRS.close();
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                    pstmt.close();
                    pstmt = null;
     } // closeResources
}//ConnectionManager
I am having a login form which submits user name and password. I am checking this against the database. Following is the servlet to do that.
package login;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import common.*;
public class loginServlet extends HttpServlet {
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               throws ServletException, IOException {
          doPost(request, response);
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     private String validateUser(String userId, String password)
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          Connection conn = null;
          PreparedStatement pstmt = null;
          ResultSet oRS = null;
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               conn = cm.getConn ();
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               String sQry = "SELECT user_login FROM user "
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               pstmt = conn.prepareStatement(sQry);
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               cm.closeConnection(conn);
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}// end of servlet class
But i am unable to compile it and i am also getting lots of warnings.
I am getting error at line
1)String uName = validateUser(userId, password);
Unhandled exception type SQLException loginServlet.java TQ3/WEB-INF/src/login line
Following warnings:
2)For loginServlet Declaration
The serializable class DBTest does not declare a static final serialVersionUID field of type long loginServlet.java
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Definitely I am doing it wrong but exactly where? I am having very strong doubt the way i am using connections is not the correct way. Pls help me.
regards
Manisha

I am in a search of best way to use connection pooling. Initially was using simple JDBC call, then modified to JNDI, afterwards tried to have common class. Later came accross the idea of Singleton/Static. I wanted to have a common class which will handle all connection related issues and at the same time give good performance.
With due respect to all Java Gurus: i got all from web articles/tutorials/java forum etc. There is a long discussion regarding Singlet vs static in this forum. But finally got confused and could not figure out in my case which method shall i make use of, so tried both.
What I want is somebody pointing out flwas inside my 2 code snippets and guide me about which method shall i adopt in future.
Static way:
package common;
import java.sql.Connection;
import javax.sql.DataSource;
import java.sql.SQLException;
import javax.naming.InitialContext;
import javax.naming.NamingException;
public final class ConnectionManager_Static {
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     private static DataSource ds = null;
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}Singleton:
package common;
import java.sql.*;
import javax.sql.*;
import javax.naming.*;
public final class ConnectionManager_Singleton {
         private static ConnectionManager_Singleton INSTANCE = null;
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          public Connection getConnection() throws Exception
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}Sorry, It's becoming long.
Thanaks in advance,
Manisha

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          Mike
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kalle
Thank you very much for your advice!!!
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Anil

ORA-22990 ( Cannot span lob... ) while using connection pooling...

Hi all, I am maintaining a web site that has lots of requests ( about 10 requests a second ) to an Oracle table that has a BLOB field. Those requests create new blobs, updates them and reads them... My program worked fine until I started using connection pooling ( Before that, I used a single connection that was initialized at startup ). Although I had to synchronized the methods that interact with blob field, everything worked great. So now, to optimize my site, I want to use connection pooling so that even if my methods are synchonized on the connection object, there will be more than one connection available so it will not affect performance.
So once I introduced my connection pooling system with the oracle.jdbc.pool.OracleConnectionCacheImpl class, I started getting ORA-22990 ( Cannot span lob objects... ). I get the error on the flush() method when I try to write the blob to the database. Here is my function that writes a row in the databse.
private synchronized void writeSession(CapSession pSession) throws Exception
        javax.sql.PooledConnection pc = pool.getPooledConnection();
        Connection conn = pc.getConnection();
        CallableStatement stmt=conn.prepareCall(writeObjSQL);
        stmt.setString(1,pSession.getSessionId()+pSession.getPassword());
        stmt.setLong(2,pSession.getLastAccess());
        stmt.setLong(3,pSession.getTimeout());
        stmt.registerOutParameter(4,java.sql.Types.BLOB);
        stmt.executeUpdate();
        oracle.sql.BLOB blob=(BLOB)stmt.getBlob(4);
        OutputStream os=blob.getBinaryOutputStream();
        ObjectOutputStream oop=new ObjectOutputStream(os);
        oop.writeObject(pSession);
        oop.flush();
        oop.close();
        os.close();
        stmt.close();
        conn.commit();
        conn.close();
        pc.close();
} If anyone could help me, I would deeply appreciate it!
Thank you for your time.

kalle
Thank you very much for your advice!!!
Like you said, I started to check whether the connections are fine before giving them from the pool.I am executing a simple "select 'anil' from dual" and if its fine only then I return the connection. So far it seems to be fine. Also I am reopening the connections(closing the old ones and opening new connections) after every 12 hours.
As far as the JDBC driver is concerned, I already tried with Oracle 8i driver, it gave the same problems. I read that 9i driver might solve this problem, so I changed to the latest 9i driver (classes12_g.zip).
Sometimes before(before I started checking whether the connection is good )the application used to hang up at the point where I am issuing setAutoCommit(false).It never comes out from that statement.Is this something to do with theconnections being closed?
What I am afraid is, will the appilation get hung up even after I check the connection with select query and then issue autocommit(false)??
Or will it hang up while I check with a select query??
As long as it doesn't hung up, I am fine. Because i am cathching the exceptions.
Thanks In ADVANCE
Anil

How to access database from applet using connection pooling.

Hi,
I am using tomcat 4.1, JRE 1.4.2_10, MySQL 5.0, and IE 6.0. I can access the database using connection pooling from JSP without problems. But, if I try to acess from the applet, I get the following exception (related to JNDI.):
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.lookup(Unknown Source)
I know what this acception means, but I don't know how to fix it. I set up connection pooling in my Tomcat 4.1 that talks to MySQL 5.0. As I said, when I access from jsp, JNDI works. But, applet complains. Please help. In my applet, the following code accesses the database:
ArrayList toolTipData =
      access.getToolTipData (projectName,interfac);This is the snipet of my Access class:
public ArrayList getToolTipData (String projectName, String interfac) {
    System.out.println("In getToolTipData");
    ArrayList toolTipData = new ArrayList();
   try{
    Context ctx = new InitialContext();
    if(ctx == null )
        throw new Exception("No Context");
    DataSource ds = (DataSource)ctx.lookup("java:comp/env/jdbc/interfacesDB");
    if (ds != null) {
      Connection conn = ds.getConnection();
      if(conn != null) {
          Statement s = conn.createStatement();
          //For some reason paramtized queries don't work, so I am forced
          //to this in slighly less eficient way.
          ResultSet rst = s.executeQuery("select * from interfaces");
          while (rst.next()) {
             if (rst.getString("Project_Name").equals(projectName) &&
                 rst.getString("Interface").equals(interfac)) {
               System.out.println("getToolTipData: ITG #" + rst.getString("ITG"));
               toolTipData.add("ITG #: " + rst.getString("ITG"));
               toolTipData.add("SPNE Prime Name: " +
                               rst.getString("SPNE_Prime_Name"));
               toolTipData.add("PD Prime Name: " +
                               rst.getString("PD_Prime_Name"));
               toolTipData.add("IT Prime Name: " +
                               rst.getString("IT_Prime_Name"));
               toolTipData.add("MLC Priority: " +
                               rst.getString("MLC_Priority"));
               toolTipData.add("Gary's Prime: " + rst.getString("Garys_Prime"));
               toolTipData.add("QA Prime: " + rst.getString("QA_Prime"));
               toolTipData.add("Brief Description: " +
                               rst.getString("Brief_Description"));
               toolTipData.add("Project_Status: " +
                               rst.getString("Project_Status"));
          conn.close();
}catch(Exception e) {
    e.printStackTrace();
return toolTipData;
....

The jsp runs on the server, whereas the applet runs on the client so
you must package with your applet any jndi implementation specific classes
and
Properties props = new Properties();
props.setProperty("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory" );
props.setProperty("java.naming.provider.url", "url:1099");
Context ctx = new InitialContext(props);
Object ref = ctx.lookup("...");

Problems using connection pooling

I'm having problems configuring connection pooling in oc4j. Have specified my datasource/connection pool in my data-sources.xml. I always get the following error when I try to access it with an instance of OracleConnectionPoolDataSource within my apps. The app server dosen't seem to create the connections when started 'cos its not displayed within Oracle dba studio. Can anyone tell what I need to do pls.
regards!
dyzke
//-- error displayed
Exception in thread "main" java.sql.SQLException: Io exception: The Network Adap
ter could not establish the connection
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:168)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:210)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:323)
at oracle.jdbc.driver.OracleConnection.<init>(OracleConnection.java:260)
at oracle.jdbc.driver.OracleDriver.getConnectionInstance(OracleDriver.ja
va:365)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:260)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java
:111)
// -- extract
<data-source
          class="com.evermind.sql.DriverManagerDataSource"
name="MYDS"
          location="jdbc/XXX"
xa-location="jdbc/xa/OracleXADS"
          ejb-location="jdbc/OracleDS"
pooled-location="xxx/xxxx"
          max-connections="10"
          min-connections="3"
          connection-driver="oracle.jdbc.driver.OracleDriver"
          username="admin"
          password="admin"
          url="jdbc:oracle:thin:@localhost:xxx"
          inactivity-timeout="30"
     />

see my answer in the other newsgroup.
please don't cross post.
"M. Hammer" <[email protected]> wrote in message
news:[email protected]..
Hi,
We have problems using connection pooling in a WLS 5.1.x - Cluster. Is it
possible to use CP in such a cluster at all ? The problem is, connections
will be opened and never been closed. How can I configure a cluster forCP?
>
I have a WLS-Cluster with 2 instances and my webApp uses connectionpooling.
By the way I get a connection on Instance 1, Instance 2 gets a connection
also, but never releases it.
In my opinion, the reference to the connection in the partner-instancewill
be lost.
How do I have to configure my cluster to work well with that stuff ?
Thank a lot,
Markus.

Strange behaviour when using connection pooling with proxy authentication

All
I have developed an ASP.NET 1.1 Web application that uses ODP.NET 9.2.0.4 accessing Oracle Database 8i (which is to be upgraded to 10g in the coming months). I have enabled connection pooling and implemented proxy authentication.
I am observing a strange behaviour in the live environment. If two users (User 1 and User 2) are executing SQL statements at the same time (concurrent threads in IIS), the following is occurring:
* User 1 opens a new connection, executes a SELECT statement, and closes this connection. The audit log, which uses the USER function, shows User 1 executed this statement.
* User 2 opens the same connection (before it is released to the connection pool?), excutes an INSERT statement, and closes this connection. The audit log shows User 1, not User 2, executed this statement.
Is this a known issue when using connection pooling with proxy authentication? I appreciate your help.
Regards,
Chris

Hi Chris,
I tried to reproduce your complaint, but was unable to. I didnt use auditting however, just a series of "select user from dual" with proxy authentication. You might want to see if you can put together a small complete testcase for this and open a sr with support.
Cheers
Greg

How To Use Connection pooling with j2sdkee1.3?

hi!
How to use javax.sql.ConnectionPoolDataSource and
javax.sql.PooledConnection with j2sdkee1.3.?
In j2ee1.3's deployment tool,
to specify the resource factories,
javax.sql.ConnectionPoolDataSource is not available.
Please Help me to use Connection pooling.
Dhaya.

Vendor implementations usually have a fair amount of optimization. For J2EE apps, my concern would be using your pool in transactional calls. When you make a transactional call across several beans/methods, the vendor's pool makes sure that you get the same connection each time you get a connection from the pool so that if you want to rollback the work (in case an error occurs), you can. Does your current connection pool support this?

Calling a RFC using connection pool

Can I use connection pool to call a RFC from my R3? I'm using SAP Enterprise Connector but I don't want to pass user/password hardcoded.
Thanks in advance.

Hi Kiran,
Yes I used SAP JRA and it works.
You need JRA deployed and configured on WAS, your basis guy can do it for you. The next step is download this PDF <a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/ad09cd07-0a01-0010-93a9-933e247d3ba4">Accessing BAPIs Using the SAP Java Resource Adapter</a>.
Follow this document, it's very easy to do so.

Unable to get Results using Connection Pool

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