Intermittent mssql4 Connection Pool Failure problems
Ocaisionally we are getting the following error:
weblogic.jdbcbase.mssqlserver4.TdsConnection.registerOutgoingPipeline(TdsConnection.java:414)
at weblogic.jdbcbase.mssqlserver4.TdsConnection.registerPipeline(TdsConnection.java:430)
at weblogic.jdbcbase.mssqlserver4.TdsStatement.execute(TdsStatement.java:182)
at weblogic.jdbcbase.mssqlserver4.TdsStatement.execute(TdsStatement.java:1521)
at weblogic.jdbcbase.jts.Statement.execute(Statement.java:302)
at weblogic.jdbc20.rmi.internal.PreparedStatementImpl.execute(PreparedStatementImpl.java:288)
at weblogic.jdbc20.rmi.SerialPreparedStatement.execute(SerialPreparedStatement.java:398
Once we get this error the whole connection pool is fried until we restart it.
We are using the test connection on checkout property of the connection pool,
so I don't understand why this problem isn't caught at connection checkout time.
Normally if there is a problem with a connection, the connection is refreshed.
However, sometimes, this happens.
What version of our product? What is the whole serverside stacktrace?
thanks,
Joe
Scott wrote:
>
Ocaisionally we are getting the following error:
weblogic.jdbcbase.mssqlserver4.TdsConnection.registerOutgoingPipeline(TdsConnection.java:414)
at weblogic.jdbcbase.mssqlserver4.TdsConnection.registerPipeline(TdsConnection.java:430)
at weblogic.jdbcbase.mssqlserver4.TdsStatement.execute(TdsStatement.java:182)
at weblogic.jdbcbase.mssqlserver4.TdsStatement.execute(TdsStatement.java:1521)
at weblogic.jdbcbase.jts.Statement.execute(Statement.java:302)
at weblogic.jdbc20.rmi.internal.PreparedStatementImpl.execute(PreparedStatementImpl.java:288)
at weblogic.jdbc20.rmi.SerialPreparedStatement.execute(SerialPreparedStatement.java:398
Once we get this error the whole connection pool is fried until we restart it.
We are using the test connection on checkout property of the connection pool,
so I don't understand why this problem isn't caught at connection checkout time.
Normally if there is a problem with a connection, the connection is refreshed.
However, sometimes, this happens.
Similar Messages
-
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 -
Oracle Connection Pool failure in COM+
I am having some trouble trying to get a specific database to work with an application that makes use of a COM+ Application. When we point the application at the UAT database everything seems fine, but when we point it to the production database after a few successful calls it ends up failing at the COM+ application recycles. The event viewer provides the following information:
Event Type: Error
Event Source: COM+
Event Category: Unknown
Event ID: 4786
Date: 8/5/2007
Time: 12:54:46 PM
User: N/A
Computer: APPL_SERVER
Description:
The system has called a custom component and that component has failed and generated an exception. This indicates a problem with the custom component. Notify the developer of this component that a failure has occurred and provide them with the information below.
Component Prog ID: Oracle Connection Pool - tnsnames_alias
Method Name: IDispenserDriver::CreateResource
Server Application ID: {30A93CB3-25EB-4258-8C88-5AE103B7B86F}
Server Application Instance ID:
{A57C513E-519F-45BD-B46D-DC54B285F534}
Server Application Name: COM+ Application Name
The serious nature of this error has caused the process to terminate.
Exception: C0000005
Address: 0x7C8327F9
Call Stack:
+ 0x7c8327f9
ntdll!RtlFindActivationContextSectionGuid + 0x7d2
ntdll!RtlInitializeSListHead + 0x175
ntdll!RtlFindActivationContextSectionGuid + 0x1b7
msvcrt!malloc + 0x6c
oracommon9!sktsfMalloc + 0x14
orageneric9!kpummapg + 0x58
orageneric9!kghalo + 0xabb
orageneric9!kghalf + 0x102
orageneric9!kopo2cpc + 0x61
orageneric9!kopeini + 0x1d
orageneric9!kopo2cpc + 0xd2
orageneric9!kopopgi + 0x117
OraClient9!koudpnp + 0x712
OraClient9!koudpnp + 0x101
OraClient9!kpuinit0 + 0xb19
OraClient9!kpuinit + 0x38
OraClient9!OCIEnvInit + 0x1c
oramts!kpntsrvr::kpntsrvr(class kpntdbid *) + 0x80
oramts!kpntdbid::allocNewSrvr(struct SIDAND_ATTRIBUTES *) + 0x138
oramts!kpntdbid::GetSrvr(class kpntsvrl * *,unsigned long) + 0x7df
oramts!kpntdisp::getNet8conn(class kpntsvrl * *,unsigned long) + 0x41
oramts!kpntsess::initOCI(void) + 0xec
oramts!kpntsess::sessionBegin(void) + 0x17b
oramts!kpntdisp::CreateResource(unsigned long,unsigned long *,long *) + 0xc4
COMSVCS!DispManGetContext + 0xa3d
COMSVCS!DispManGetContext + 0x1fee
oramts!kpntdisp::allocateConnection(class kpntsess * *,unsigned long,class kpntrtyp *) + 0x3c4
oramts!_kpntsvcgetex + 0x183
oramts!_kpntsvcget + 0x25
oramts!kpntctra::getConnectionAndHandles(class kpntrtyp *,struct OCISvcCtx * *,struct OCITrans * *,struct OCIError * *) + 0x87
oramts!kpntctra::abortBranch(struct xid_t &,class kpntbrnch *,struct BOID *,int,struct BOID *) + 0x15a
oramts!kpntctra::doAbort(struct BOID *,int,struct BOID *) + 0x454
oramts!kpntajob::doJob(void) + 0x27
oramts!kpntjobq::serviceRequest(class kpntjob *) + 0x3e
oramts!workerThread(void *) + 0xd0
msvcrt!_endthreadex + 0xa3
kernel32!GetModuleFileNameA + 0xeb
Not being an expert in Oracle, I have been able to dig up a little bit of information that might be of use ...
a) Our tnsnames.ora indicates that the connections are to be DEDICATED and running Toad bares this out -- dllhost ends up with a single connection.
b) most of the database initial set of parameters seem to be very similar. The only difference I noticed was that the archive log mode and db_cache_advice are ON for production.
c) We have little control over how the connection strings are being created internally in this COM+ application, but however they are created it works for UAT and doesn't for PROD.
d) When we go into our web application and hit a page that makes use of the COM+ component to render, it will work the first time but when I do a simple browser refresh it will usually fail on the 2nd or 3rd time. Almost like it is trying to expand the connection pool size and the oracle server is throwing up.
If I didn't mention earlier the two database instances run on different servers but the application server is exactly the same. We only change the alias we are using for the database (both are defined in tnsnames) and the password used to make its connection.
Does anyone have any clues on this one? I am really spinning my wheels trying to figure out what could cause this type of situation. Anything at all would be very helpful.It appeared to us that the problem was with the Oracle server and that it might have been failing when we were trying to expand our application connection pool size or basically obtain more connections.
The biggest indicator of this is that we run the same application code against two different databases and one works and one does not work. Having said this, I suppose the problem could be rooted in a data error instead of an oracle server error ...
Is there a specific trace file on the oracle server that would help me point to any error that is truly an oracle server error? Sorry I am very new to Oracle. -
Why would connection pooling cause problems with a trigger?
This is a strange one. We have an app that deletes a row in a database table, and this table has a delete trigger on it. The row gets deleted every time the app is run, yet the trigger only fires intermittently. It's not that the trigger is failiing in some way - it just doesn't get called at all. If I issue the same delete command in PL/SQL developer then the trigger fires every time.
Several hours later and out of desparation I tried turning off connection pooling via the app's connection string, and found that the trigger now fires every time. Any ideas what might be causing this behaviour? I can reproduce/fix the issue every time simply by setting "Pooling" to true or false!
We are using Oracle 11g and ODP.Net v4.112.2.0.
Thanks in advance
AndrewMore information: I've now been able to reproduce this issue in a small .Net app, and can make it fail in a more consistent manner (which I'll explain later). While it's still too large to post the entire code here, I can summarise what the app does in pseudo-code:-
for(int i = 1; i <= 10; i++) // Run the test a number of times
// Step 1 - Delete rows from the table with the delete query in question
Execute non-query "delete from test_table";
Wait 1 second
// Step 2 - Check that the delete actually happened
Execute reader "select count(*) from test_table"
Display the count
// Step 3 - Check that the delete trigger inserted some rows into a "logging" table. This is my method of "tracing" - I added a basic insert to the start of each trigger section, as mentioned in my previous post.
Execute reader "select count(*) from my_logging_table"
Display the count
// Reinstate the test data
Execute non-query "<insert rows back into test_table>"
Wait 1 second
For info the connection string is fairly basic:- "Data Source=<tns name>;User Id=<foo>;Password=<bar>"
Some points of interest:-
- When running the above test app, the trigger successfully fires on the very first iteration (i.e. "Step 3" displays a non-zero count from the logging table). All subsequent iterations fail ("Step 3" displays the same count each time).
- If I turn off connection pooling (by adding "Pooling=false" to the connection string), the trigger runs on every iteration (i.e. "Step 3" displays an ever-incrementing record count).
- Regardless of whether it works or fails, the deletion in step 1 does take place (confirmed by "Step 2" displaying a count of zero).
- I added the waits after the non-query calls to see if that made a difference, but it doesn't. I can change these to 10 seconds or more and it will have no effect on the issue.
The "Execute non-query" method uses code along these lines:-
using (var conn = new OracleConnection(ConnString))
conn.Open();
using (var cmd = conn.CreateCommand())
cmd.CommandText = sql;
cmd.CommandType = CommandType.Text;
result = cmd.ExecuteNonQuery();
conn.Close();
return result;
While the "Execute reader" method looks like this:-
var conn = new OracleConnection(ConnString);
conn.Open();
var cmd = conn.CreateCommand();
cmd.CommandText = sql;
cmd.CommandType = CommandType.Text;
return cmd.ExecuteReader(CommandBehavior.CloseConnection);
The calling code in the for loop, wraps the returned reader in a using clause like this:-
using (var reader = ExecuteReader("<sql>"))
This will dispose of the reader, which will in turn close/dispose the connection (due to the CommandBehavior.CloseConnection parameter passed to ExecuteReader).
Interestingly, if the reader isn't disposed of then the problem becomes more intermittent (the trigger will fire perhaps 25% of the time). This is what's happening in our unit test harness. By ensuring the reader/connection is closed and disposed (which common sense would say should improve matters), the trigger only fires on the very first iteration of the loop. The plot thickens. -
Connection Pool Failure: "No suitable driver"
Hi,
Upon server startup, I get the following result:
<Nov 7, 2001 4:18:32 PM CST> <Error> <JDBC> <Cannot startup connection pool "ora
cleTrufflePool" No suitable driver>
I assumed it was a path problem, but in the startWebLogic.cmd script I've set the PATH and CLASSPATH variables to the same as in a separate command window that can successfully dbping the Oracle db.
One thing I completely don't understand is what the URL value should be for the pool, and I can't see a pattern in the examples and docs I've found on this. Here are my pool settings, at any rate:
Name: oracleTrufflePool
URL: myOracleServerName
Driver Classname: weblogic.jdbc.oci.Driver
Properties:
user=user
password=password
server=myOracleServerName
ACLName: user
Password: password
As you can see, I also don't understand whether the Oracle user name and password must be duplicated in the Properties section, or should they really only be listed in the ACLName and Password fields (in the Server Console UI)?
TIA,
SteveHi. The issue is that the URL you give is not the URL the driver (weblogic.jdbc.oci.Driver)
wants. The URL should be "jdbc:webLogic:oci". The properties user, password and server
will be passed to the driver for conenction attempts. The ACL is for who gets to use the
pool, and the other password entry is only if you need the DBMS password to be encrypted
in the XML. If so, set that password value, and don't have it in the driver properties.
Joe
Steve Clark wrote:
>
Hi,
Upon server startup, I get the following result:
<Nov 7, 2001 4:18:32 PM CST> <Error> <JDBC> <Cannot startup connection pool "ora
cleTrufflePool" No suitable driver>
I assumed it was a path problem, but in the startWebLogic.cmd script I've set the PATH and CLASSPATH variables to the same as in a separate command window that can successfully dbping the Oracle db.
One thing I completely don't understand is what the URL value should be for the pool, and I can't see a pattern in the examples and docs I've found on this. Here are my pool settings, at any rate:
Name: oracleTrufflePool
URL: myOracleServerName
Driver Classname: weblogic.jdbc.oci.Driver
Properties:
user=user
password=password
server=myOracleServerName
ACLName: user
Password: password
As you can see, I also don't understand whether the Oracle user name and password must be duplicated in the Properties section, or should they really only be listed in the ACLName and Password fields (in the Server Console UI)?
TIA,
Steve -
MySQL connection pooling (tomcat) problem
Hi all i just started learning servlets and i want to make a program in order to understand database connection pooling in tomcat.My problem is that when i run the servlet i created i get this error :
java.lang.NullPointerException org.DB.TestDB2.doGet(TestDB2.java:105) javax.servlet.http.HttpServlet.service(HttpServlet.java:690) javax.servlet.http.HttpServlet.service(HttpServlet.java:803) org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
And that from tomcat log from netbeans :
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
.I configured tomcat server.xml file like this :
<Context path="/DBTest" docBase="DBTest" debug="5" reloadable="true" crossContext="true"> <Resource name="jdbc/phonebook_db" auth="Container" type="javax.sql.DataSource" maxActive="100" maxIdle="30" maxWait="10000" username="*******" password="********" removeAbandoned="true" removeAbandonedTimeout="120" driverClassName="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost:3306/test_phonebook_db?autoReconnect=true"/> </Context>
This is the resource reference i have in my web app web.xml file :
<resource-ref> <description>DB Connection</description> <res-ref-name>jdbc/phonebook_db</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref>
And this is my servlet class :
package org.DB; import javax.servlet.*; import javax.servlet.http.*; import java.io.*; import java.sql.*; import javax.naming.*; import javax.sql.*; public class TestDB2 extends HttpServlet { private Connection conn ; private Statement stat ; private ResultSet rs ; private int counter; private Object rsValue; public void init() { try { InitialContext ctx = new InitialContext(); DataSource ds = (DataSource)ctx.lookup("java:comp/env/jdbc/phonebook_db"); conn = ds.getConnection(); } catch(Exception e) { e.printStackTrace(); } } public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException { try { stat = conn.createStatement(); rs = stat.executeQuery("SELECT * FROM phones_table"); } catch (SQLException sqle) { sqle.printStackTrace(); } response.setContentType("text/html; charset=utf-8"); PrintWriter out = response.getWriter(); String docType = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " + "Transitional//EN\">\n"; out.println(docType +"<HTML>\n" + "<HEAD><TITLE>PhoneBook entries</TITLE></HEAD>\n"); counter = 0; try { while (rs.next()) { out.println("<h4>Entry no. " + (++counter) + "</h4>"); out.println("<table width=\"75%\" border=\"1\">"); out.println("<tr>\n"+ "<td width=\21%\"><b>LastName:</b></td>\n"+ "<td width=\"79%\">"); out.println((((rsValue = rs.getObject("LASTNAME"))==null || rs.wasNull())? "":(rsValue.toString()))); out.println("</td>\n</tr>\n" + "<tr>\n"+ "<td width=\21%\"><b>FirstName:</b></td>\n"+ "<td width=\"79%\">"); out.println((((rsValue = rs.getObject("FIRSTNAME"))==null || rs.wasNull())? "":(rsValue.toString()))); out.println("</td>\n"+ "</tr>\n"+ "<td width=\21%\"><b>Phone:</b></td>\n"+ "<td width=\"79%\">"); out.println((((rsValue = rs.getObject("PHONE"))==null || rs.wasNull())? "":(rsValue.toString()))); out.println("</td>\n" + "</tr>\n" + "</table>\n"+ "<br>\n<br>"); } } catch (SQLException sqle) { sqle.printStackTrace(); } out.println("</body>\n"+ "</html>"); } public void destroy() { try { rs.close(); stat.close(); conn.close(); } catch (SQLException sqle) { sqle.printStackTrace(); } } }{code} Any suggestions?Thank you for your answer.Yes my servlet class is something more worse than horrible(i don't use the database connection correct i don't use the MVC pattern i use out.println() ) but i just tried to take a ready example and try to understand .So i write this servlet myself as a starting point :
package org.DB;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.sql.*;
public class DBServlet extends HttpServlet {
private Connection conn ;
private Statement stat ;
private ResultSet rs ;
private int counter;
String driver = "com.mysql.jdbc.Driver";
String dbURL = "jdbc:mysql://localhost:3306/phonebookdb?user=**********&password=************";
@Override
public void init() {
try {
Class.forName(driver).newInstance();
conn = DriverManager.getConnection(dbURL);
}catch(Exception e) {
e.printStackTrace();
System.err.print("Unable to make connection ");
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet DBServlet</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet DBServlet at " + request.getContextPath () + "</h1>");
out.println("<br /><br /><br />");
if(conn!=null)
out.println("conn object : "+conn);
out.println("</body>");
out.println("</html>");
} catch(Exception sq) {
System.out.println("Exception" + sq.getMessage());
out.close();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
public void destroy() {
try {
conn.close();
} catch (SQLException sqle) {
sqle.printStackTrace();
@Override
public String getServletInfo() {
return "A Simple Servlet";
}And it work for now.
Edited by: pavlos555 on Oct 21, 2008 10:21 AM -
Hello. I'm using wls 5.1 and Oracle 8i and an unable to make a connection pool. I keep getting the following with the message below. Where and how do I change my path?
weblogic.common.ResourceException: weblogic.common.ResourceException:
Could not create pool connection. The DBMS driver exception was:
java.sql.SQLException: System.loadLibrary threw java.lang.UnsatisfiedLinkError
'no weblogicoci36 in java.library.path'.
at weblogic.jdbcbase.oci.Driver.connect(Driver.java:116)Hi,
You need to ensure that the ORACLE_HOME is set and PATH has
%ORACLE_HOME%\bin;%ORACLE_HOME%\lib;%WL_HOME%\bin\oci816_8 (check verison of
database) in the server startup script.
hth
sree
"Purvi" <porgie_76@> wrote in message news:3c6306f9$[email protected]..
Hello. I'm using wls 5.1 and Oracle 8i and an unable to make a connection
pool. I keep getting the following with the message below. Where and how do
I change my path?
weblogic.common.ResourceException: weblogic.common.ResourceException:
Could not create pool connection. The DBMS driver exception was:
java.sql.SQLException: System.loadLibrary threw
java.lang.UnsatisfiedLinkError
'no weblogicoci36 in java.library.path'.
at weblogic.jdbcbase.oci.Driver.connect(Driver.java:116) -
HELP - DB2 v9 & App Server PE 9.0 - PING Connection Pool Failure - HELP
I've been playing around with Studio Creator and DB2 v9 without any issues.
So I figured I would installed App Server PE 9 and use this as my production server that I would deploy to from studio creator.
However, in my efforts to set up db2/v9 I have been trying to ping a connection pool without any luck. I get the following message:
Operation 'pingConnectionPool' failed in 'resources' Config Mbean. Target exception message: Connection could not be allocated because: [sunm][DB2 JDBC Driver]Resource Limits Reached( ALLOCATE MEMORY FOR NEW SQLSTT FAILED ). Diagnostic Info: FUNCTION ID = 0049 , PROBE POINT = 0400 , TRACE POINT = 0030 , SUBCODE1 = 8B0F0000, SUBCODE2 = 78A68A98, SUBCODE3 = 00000000, ERROR MSG = Parser: Memory allocation error.
My datasource class name is com.sun.sql.jdbcx.db2.DB2DataSource.
And my resource type is javax.sql.datasource
I have copied smbase.jar, smdb2.jar and smutil.jar into c:\sun\appserver\lib
and I have all of the properties (serverName, portNumber, databaseName, user, password) created and set accordingly.
Any help would be greatly appreciated.Here is how I got the DB2 Express-C and Sun PE 9.0 to work. ( at least base connectivity wise )
1. ) You have to have at least the DB2 Client installed on the system that will be communicating to the DB2 instance.
2.) The following jars will be needed ( depending on the driver type used) . db2java.zip, db2jcc.jar, and db2jcc_license_cu.jar and use them in the App Server ->JVM settings -> Path Settings -> Classpath Suffix
3.) The next setup is dependent on the Type driver you use
I used the Type 4 and this is the resource setup I used.
Connection Pool:
Name: DB2TestPool
Datasource Classname: com.ibm.db2.jcc.DB2SimpleDataSource
Resource Type: javax.sql.ConnectionPoolDataSource
Properties:
user: xxxxxx
password: xxxxxx
databaseName: TEST
serverName: <hostname of machine>
portnumber: 50000
driverType: 4
URL: jdbc:db2://<hostname>:<port>/<database>
JDBC Resource:
JNDI Name: jdbc/TEST
Pool Name: DB2TestPool
With this configuration I was able to ping the database as well as connect to create an entity bean from a table. This should give you a starting point.
I have yet to deploy my application, but should be doing that sometime today to verify that a connection can be made and used from within the application. -
Create and Apply new connection pool failure
Hi all,
I am trying to creat a new connection pool by the examples Console with WebServer
6.0
Name: testingPool
URL: jdbc:cloudscape:demo or jdbc:dbc:cloudscape:Test (where Test is a new DB
in cloudscape)
Driver Name:COM.cloudscape.core.JDBCDriver
Property:
user=none
password=none
server=none
Then create a Datasource which using the new created testingPool and the Target
is the "exampleServer"
However when I start the server,it keeps on complaining that the "testingPool
is not exist".
Any setting that I 've missed when using a new connection pool??
I only know the workaround is using the demoPool which is already exist in the
example.
Any help will be very appreciate!!
Thanks !
Regards,
u0p1HI,
I've already set the Target Server to be the Example Server,
is it wrong?
"Sree Bodapati" <[email protected]> wrote:
Check if you have set a target server for the connection pool.
sree
"u0p1" <[email protected]> wrote in message
news:3bb3bc32$[email protected]..
Hi all,
I am trying to creat a new connection pool by the examples Consolewith
WebServer
6.0
Name: testingPool
URL: jdbc:cloudscape:demo or jdbc:dbc:cloudscape:Test (where Test isa new
DB
in cloudscape)
Driver Name:COM.cloudscape.core.JDBCDriver
Property:
user=none
password=none
server=none
Then create a Datasource which using the new created testingPool andthe
Target
is the "exampleServer"
However when I start the server,it keeps on complaining that the"testingPool
is not exist".
Any setting that I 've missed when using a new connection pool??
I only know the workaround is using the demoPool which is already existin
the
example.
Any help will be very appreciate!!
Thanks !
Regards,
u0p1 -
Connection Pool establishment problem
Hi Experts,
we have one application with JCo mechanism. For this application,
we are using one properties file, which holds ABAP connection information. From this connection information(sapconn.props), we created connection pool and fetching data from the back end. Now my requirement is, instead of this properties file, we want to use one SLD, from this i would like to fetch connection information and establish a connection pool. How can we implement this one...?
Is there any API to read the ABAP connection informaation from visual admin (JCo RFC provider) ?
Thanks
mahaYour question has been answered in this [thread|connection establishment doubt;.
Please read the [rules|https://wiki.sdn.sap.com/wiki/display/HOME/RulesofEngagement], in particular - do not cross post.
-- Vladimir -
Cannot get a connection, pool error Timeout waiting for idle object
my connection pool setting is
maxActive="3" minIdle="2" maxWait="10000" removeAbandoed="true" logAbandoned="true" removeAbandonedTimeout="30" autoreconnection="true"
we have 7 people hitting the group of search functions ,
about 3 minutes I get
I got error like
org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot get a connection, pool error Timeout waiting for idle object at org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:104) at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880) at Deferment.showResult.checStudent(showResult.java:135) at Deferment.showResult.doPost(showResult.java:99) at javax.servlet.http.HttpServlet.service(HttpServlet.java:710) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803) at org.apache.catalina.servlets.InvokerServlet.serveRequest(InvokerServlet.java:402) at org.apache.catalina.servlets.InvokerServlet.doPost(InvokerServlet.java:170) at javax.servlet.http.HttpServlet.service(HttpServlet.java:710) at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
I just wonder
1) Cannot get a connection, pool error Timeout waiting for idle object-> cause by connection pool leaking or other problem.
2) Setting the maxactive to -1 ( suggestion from Google) , if I set my connection to ulimit , waht should I put on minIdle="2"
3) How can I test my connection pool have problem or not ? is
SHOW PROCESSLIST; tolding me someinformation? I use Mysql
Thank you!I try something like ps2 = conn.prepareStatement(target);
ps2.setString(1, UNumber); // set input parameter
rs = ps2.executeQuery();
sendMail = 0;//how many rows we can find.
while (rs.next()) {
sendMail++;
ps2.close();
rs.close();
conn.close();
if ((count1 == 0) || (count2 == 0)) {
conn.rollback();
} else {
conn.commit();
conn.setAutoCommit(true);
ps.close();
calstat2.close();
conn.close();
calstat = (CallableStatement) conn.prepareCall("{call findStudent}");
calstat.executeQuery();
calstat.close();
conn.close();is that enought? what else I should do to make sure I did close all the connection, after I use it ?
thank you -
Serious connection pool problem on Tomcat
Hi,
We are deploying our JSF creator-made app onto Tomcat 1.5. We set up our JNDI datasource on Tomcat (using the i-net driver ).
Initially the pages load ok but after a short period of time we are getting these errors:
Initialization Failure: javax.faces.FacesException: org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot get a connection, pool exhaustedWe believe that somehow the Creator-generated code is NOT freeing up connections in the connection pool.
We think that when the afterRenderResponse() methods in the beans call rowset.close() this is NOT returning the connections to the pool. Can someone, hopefully a Sun Engineer confirm that the rowset.close() code in afterRenderResponse() returns the connection behind the rowset to the connection pool.
Could this be a driver issue? We are using the i-net driver not the DataDirect one, but this should implement the full API.
This is a very serious problem for us.
regards,
johndo you have any example code you could post? I have a Spring/JSC tutorial on this forum. Just search for Spring and you should find it. It you need something more, I'll try to give you some help...time provided.
am i
right in thinking that you use the forms designer to
lay out your pages and just put your own stuff in the
bean constructor?Close...but not everything goes in the constructor.
>
One thing that may have caused a problem is we have
just noticed that in one of our most commonly hit
pages this line:
dataTable1Model.setDataCacheKey("com.sun.datacache.my_
page.my_rowset");
featured the WRONG "my_page" jsp page but the correct
rowset name "my_rowset". The page DID load correctly
and run correctly, though. Could this cause problems
with connection pooling? Anyone?I wouldn't think so, but it depends on how Creator builds the code. -
Oracle connection pool problem (dbcp binded with jtom)
Hi,
my webserver is Tomcat5.0.18, I want to offer the connection pool and transaction management
in my currently system
I know in Tomcat5.0 version, we can use the DBCP to offer the database connection pool
service, to apply the transaction management in my system, I adapt the JTOM
now, my problem is
to use DBCP, I setup the datasource factory to be
org.apache.commons.dbcp.BasicDataSourceFactory, the connection pool is ok, but
the transaction management offerred by JTOM will failure
to make the tranaction management of JTOM succeed, I have to setup the datasource factory to be
org.objectweb.jndi.DataSourceFactory, but the connection pool offerred by Tomcat will failure now
it seems that these two datasource factory has conflict
How can I do?, I don't want to use the connection pool offerred in JTOM
Anyone can help me??
Thanks in advanceHi,
I don't know the solution for JOTM, but you could try this JTA and its connection pools:
http://www.atomikos.com ships a JTA that integrates with Tomcat and also provides JDBC connection pooling. There is a GUI control panel so that you don't have to know the XML details for Tomcat's config files.
Best,
Guy -
Oracle.DataAccess 2.112.1.0 - Connection Pool Problem
Hi,
Oracle.DataAccess 2.112.1.0 is having connection pool problem. The no. of TCP connections to Oracle database keep increasing untill the server's session run out of limit. My application created connections, use them, close them, and dispose them properly. When using previous Oracle.DataAccess 2.111.6.20, the no. of TCP connections do not increase.
My database connection string has "Min Pool Size = 3 and Max Pool Size = 150".
With 2.111.6.20 version, TCP connection stays at 3.
With 2.112.1.0, TCP connection keep increasing for every 5 minutes. I've tried to disable Self Tuning, but still can't prevent the connections from increasing.
Later today, I downloaded Oracle.DataAccess 2.112.1.2 (it comes with ODAC 11.2.0.1.2) and test again, the problem is resolved... no more connection increases... but.... it is only for 32 bit Windows.
Unfortunately, there is no Oracle.DataAccess 2.112.1.2 for 64 bit Windows Server 2008.
May I know how can i resolve this problem on 64bit Window installed with Oracle 11g R2 client, which comes with Oracle.DataAccess 2.112.1.0, which has serious problems...(according to this 11.2 ODP.NET causing test runner failures )
Many thanks for your time and answers!
Edited by: user1502907 on 04-Sep-2010 23:01Hi,
The only thing that jumps out within your problem description is that connections are being increased every 5 minutes. Are you sure its every 5 minutes and not 3 minutes which is the timing interval used by the Connection Pool facility to perform connection pool maintenance. If this occurs even when the application is idle then you could be running into the following known issue filed against 11.2.0.1.0 and fixed in 11.2.0.1.2.
Bug 9711600 - CONNECTIONS INCREASE BEYOND MAX POOL SIZE EVERY 3 MINUTE
This is specific to using the option CommandBehavior.CloseConnection when calling execute reader. Are you using this option and then also closing the connection in code before the datareader object is closed, if so you may be hitting this bug. You can also generate an ODP trace at level 15 of the behavior and if you see negative pool counts, that is also a diagnostic that points to this bug.
This is fixed in 11.2.0.1.0 Patch 3 or later for x64. If you have support, I recommend you open a service request to verify if this is your issue and if a patch set may help you.
Regards
Jenny B. -
WLS6.0 sp2 / Win2k
Oracle 8.1.7 / Solaris 8
problem is if DB fails, the connection pool fails, and will not restart. If I run a java weblogic.Admin EXISTS_POOL command, it says the pool doesnt exist.
If i run a RESET_POOL, using the system user password, it comes back with:
Exception in thread "main" javax.naming.AuthenticationException. Root exception is java.lang.Securi
tyException: Authentication for user guest denied in realm weblogic
<<no stack trace available>>
I have test on reserved set (and dual as the table).
Anyone shed any light on what could be going wrong, because right now, every time the DB fails, we have to restart the **&$"&^ server.... (and that takes around 20mins for all the apps to init)
tks
willHi Will,
When you bring up the server, if the database is down, your connection pools
will not come up if you have an initial capacity greater than 0. This is a
known issue and the workaround for this is to set the initial capacity to
zero so the pool comes up even when the database is down, then make sure you
set the capacity increment to the value that you like your initial capacity
to be and have the TestConnectionOnReserve to true.
hth
sree
"Will" <[email protected]> wrote in message
news:3d13111f$[email protected]..
WLS6.0 sp2 / Win2k
Oracle 8.1.7 / Solaris 8
problem is if DB fails, the connection pool fails, and will not restart.If I run a java weblogic.Admin EXISTS_POOL command, it says the pool doesnt
exist.
If i run a RESET_POOL, using the system user password, it comes back with:
Exception in thread "main" javax.naming.AuthenticationException. Rootexception is java.lang.Securi
tyException: Authentication for user guest denied in realm weblogic
<<no stack trace available>>
I have test on reserved set (and dual as the table).
Anyone shed any light on what could be going wrong, because right now,every time the DB fails, we have to restart the **&$"&^ server.... (and that
takes around 20mins for all the apps to init)
>
tks
will
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