JDBC Driver Threading Problems

I'm not able to get the JDBC thin driver to correctly support
multiple threads using the same database connection. A long
running query in one thread blocks all the other threads until
the query begins returning data.
My configuration is :
JDBC 8.0.4.6 on Solaris & NT
Oracle 8.05 on HPUX
I have tried the JDBC 8.1.5 driver but abandoned it because in
some situations it will deadlock itself with only 1 client
thread! (I can recreate this at will.)
I have plenty of thread stacks showing the problem if anyone is
interested.
null

Roger Grywalski (guest) wrote:
: I'm not able to get the JDBC thin driver to correctly support
: multiple threads using the same database connection. A long
: running query in one thread blocks all the other threads until
: the query begins returning data.
That's true. We don't serialize requests but synchronize them
over one physical connection.
: My configuration is :
: JDBC 8.0.4.6 on Solaris & NT
: Oracle 8.05 on HPUX
: I have tried the JDBC 8.1.5 driver but abandoned it because in
: some situations it will deadlock itself with only 1 client
: thread! (I can recreate this at will.)
: I have plenty of thread stacks showing the problem if anyone is
: interested.
Please file a bug. We would like to fix them.
We have excellent results with our 8i drivers. We ran
more than 1000 threads and they all work fine.
Oracle Technology Network
http://technet.oracle.com
null

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Is Oracle JDBC driver thread safe

Is the Oracle JDBC driver thread safe?

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Thread 1 access to a CLOB via
ResulSet.getCharacterStream(int)
Thread 2 normal access via some select and
ResulSet.getString(int)
(Both using the same connection)
The following threads appear to be in a circular deadlock.
Further information can be found by looking in the Overall Thread Analysis
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Multi-threaded deadlock 1:
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String Format [ ]
Max Pooled Statements 100
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Query Timeout 0
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CLOB [ ]
BLOB [ ]
Long Text Buffer 64000
Blob Buffer 64000
Validate Connection [ ]
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Native Error Code: 0
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Native Error Code: 0
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I think you've made some syntax error,
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here is the modified code
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import oracle.jdbc.driver.*;
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Hello 1
Hello 2
Hello 3
java.lang.NullPointerException
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Looking for a solution soon
Regards
Abhinav

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Jdbc driver creates new thread for each statement with a query timeout set

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An unexpected exception has been detected in native code outside the VM.
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:118)
at weblogic.jdbcbase.pool.ResultSet.close(ResultSet.java:166)
at weblogic.jdbc20.rmi.internal.ResultSetImpl.close(ResultSetImpl.java:5
1)
at weblogic.jdbc20.rmi.SerialResultSet.close(SerialResultSet.java:54)
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Hi Owen,
You may have to get the latest patchset from oracle for your OCI client
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sree
"Owen He" <[email protected]> wrote in message
news:3cf5940c$[email protected]..
>
we have weblogic 5.1(sp6) running on redhat linux 7.1
we install oracle client (8.1.7.0.0) and jdbc12(classes12.zip).
the connection pool use type 2 driver
oracle.jdbc.driver.OracleDriver
the jdk is 1.3.1 b24 (we have try -native -server -hotspot)
sometime weblogic crash , the error output is:
An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : 11 occurred at PC=0x51dc0310
Function name=kpufGetRcvInfo
Library=/usr/local/oracle/product/8.1.7/lib/libclntsh.so.8.0
Current Java thread:
at oracle.jdbc.oci8.OCIDBAccess.close_query(Native Method)
at oracle.jdbc.oci8.OCIDBAccess.closeQuery(OCIDBAccess.java:541)
atoracle.jdbc.driver.OracleResultSetImpl.internal_close(OracleResultSet
Impl.java:627)
atoracle.jdbc.driver.OracleResultSetImpl.close(OracleResultSetImpl.java
:118)
at weblogic.jdbcbase.pool.ResultSet.close(ResultSet.java:166)
atweblogic.jdbc20.rmi.internal.ResultSetImpl.close(ResultSetImpl.java:5
1)
atweblogic.jdbc20.rmi.SerialResultSet.close(SerialResultSet.java:54)
>
>
for some reason , we can't change to type 4 driver .
any advice is very thanks

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at java.lang.Exception.<init>(Compiled Code)
at java.sql.SQLException.<init>(Compiled Code)
at oracle.jdbc.dbaccess.DBError.check_error(Compiled
Code)
at oracle.jdbc.ttc7.TTCItem.setArrayData(Compiled Code)
at
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at
oracle.jdbc.driver.OraclePreparedStatement.setString(Compiled
Code)
at testi.main(Compiled Code)
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null

Post the full stacktrace here
Also you might want to post jdbc related questions to weblogic.developer.
interest.jdbc
Kumar
DreamNEON wrote:
Hello,
the NSAPI integration works, also the JSP files.
But I have still problems with the Jdriver for my Oracle 8.1.5.
I get the message :
Failed to invoke startup class
weblogic.jdbc.common.internal.JdbcStartup=weblogic.jdbc.common.internal.JdbcStartup
when the WebLogic Server is started.
Any ideas or hints about that?
Thanks in advance
Armin

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All of the ejbs have a unique jndi name. Each app has its only ejbs.
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However, If I deploy both of them , only one of them works.
I started the app server serval times. However, every time I got a different fail app.
For example, I got the following error message:
[24/Jan/2005:15:38:41] SEVERE ( 2440): Validation error in class gwumc.edu.ejb.smhs.visitingstudent.StudentBean129315485_JDOState: com.sun.jdo.api.persistence.model.util.ModelValidationException: Warning: Cannot find the table Student for the class gwumc.edu.ejb.smhs.visitingstudent.StudentBean129315485_JDOState.
 Verify that the schema file exists and that its contents are correct.
[24/Jan/2005:15:38:42] INFO ( 2440): Bean Student method ejbFindActiveByPassword: problems running JDOQL query with params [21]
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 at gwumc.edu.ejb.smhs.visitingstudent.StudentBean129315485_ConcreteImpl_LocalHomeImpl.findActiveByPassword(StudentBean129315485_ConcreteImpl_LocalHomeImpl.java:137)
 at gwumc.edu.ejb.smhs.visitingstudent.StudentDeanSessionBean.ejbCreate(StudentDeanSessionBean.java:24)
 at gwumc.edu.ejb.smhs.visitingstudent.StudentDeanSessionBean_LocalHomeImpl.create(StudentDeanSessionBean_LocalHomeImpl.java:27)
 at gwumc.edu.smhs.servlet.VisitingStudentDeanModel.<init>(VisitingStudentDeanModel.java:18)
 at gwumc.edu.smhs.servlet.VisitingStudentDean.doPost(VisitingStudentDean.java:27)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:720)
 at org.apache.catalina.core.StandardWrapperValve.access$000(StandardWrapperValve.java:118)
 at org.apache.catalina.core.StandardWrapperValve$1.run(StandardWrapperValve.java:278)
 at java.security.AccessController.doPrivileged(Native Method)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:274)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
 at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:158)
 at com.iplanet.ias.we
[24/Jan/2005:15:38:42] INFO ( 2440): b.WebContainer.service(WebContainer.java:850)
 NestedStackTrace:
 com.sun.jdo.api.persistence.support.JDOUserException: The mapping for class gwumc.edu.ejb.smhs.visitingstudent.StudentBean129315485_JDOState is invalid. Compile the class in the IDE, correct any errors, and verify that all required files are packaged for execution.
 at com.sun.jdo.spi.persistence.support.sqlstore.SQLStoreManager.getPersistenceConfig(SQLStoreManager.java:128)
 at com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerImpl.loadPersistenceConfig(PersistenceManagerImpl.java:2085)
 at com.sun.jdo.spi.persistence.support.sqlstore.impl.PersistenceManagerImpl.getRetrieveDesc(PersistenceManagerImpl.java:1009)
 at com.sun.jdo.spi.persistence.support.sqlstore.query.jqlc.CodeGeneration.createRetrieveDesc(CodeGeneration.java:707)
 at com.sun.jdo.spi.persistence.support.sqlstore.query.jqlc.CodeGeneration.checkRetrieveDesc(CodeGeneration.java:4665)
 at com.sun.jdo.spi.persistence.support.sqlstore.query.jqlc.CodeGeneration.prepareRetrieveDescs(CodeGeneration.java:4360)
 at com.sun.jdo.spi.persistence.support.sqlstore.query.jqlc.CodeGeneration.query(CodeGeneration.java:850)
 at com.sun.jdo.spi.persistence.support.sqlstore.query.jqlc.JQLC.codeGen(JQLC.java:332)
 at com.sun.jdo.spi.persistence.support.sqlstore.query.QueryImpl.doExecute(QueryImpl.java:626)
 at com.sun.jdo.spi.persistence.support.sqlstore.query.QueryImpl.executeWithArray(QueryImpl.java:552)
 at gwumc.edu.ejb.smhs.visitingstudent.StudentBean129315485_ConcreteImpl.ejbFindActiveByPassword(StudentBean129315485_ConcreteImpl.java:3491)
 at gwumc.edu.ejb.smhs.visitingstudent.StudentBean129315485_ConcreteImpl_LocalHomeImpl.findActiveByPassword(StudentBean129315485_ConcreteImpl_LocalHomeImpl.java:137)
 at gwumc.edu.ejb.smhs.visitingstudent.StudentDeanSessionBean.ejbCreate(StudentDeanSessionBean.java:24)
 at gwumc.edu.ejb.smhs.visitingstudent.StudentDeanSessionBean_LocalHomeImpl.create(StudentDeanSessionBean_LocalHomeImpl.java:27)
 at gwumc.edu.smhs.servlet.VisitingStudentDeanModel.<init>(VisitingStudentDeanModel.java:18)
 at gwumc.edu.smhs.servlet.VisitingStudentDean.doPost(VisitingStudentDean.java:27)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:720)
 at org.apache.catalina.core.StandardWrapperValve.access$000(StandardWrapperValve.java:118)
 at org.apache.catalina.core.StandardWrapperValve$1.run(StandardWrapperValve.java:278)
 at java.security.AccessController.doPrivileged(Native Method)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:274)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
 at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:158)
 at com.iplanet.ias.web.WebContainer.service(WebContainer.java:850)
[24/Jan/2005:15:38:42] SEVERE ( 2440): StandardWrapperValve[visitingstudentdean]: Servlet.service() for servlet visitingstudentdean threw exception
 javax.servlet.ServletException: nested exception is: com.sun.jdo.api.persistence.support.JDOFatalInternalException: Failed to load the configuration for class gwumc.edu.ejb.smhs.visitingstudent.StudentBean129315485_JDOState.
 NestedException: com.sun.jdo.api.persistence.support.JDOUserException: The mapping for class gwumc.edu.ejb.smhs.visitingstudent.StudentBean129315485_JDOState is invalid. Compile the class in the IDE, correct any errors, and verify that all required files are packaged for execution.
 at gwumc.edu.smhs.servlet.VisitingStudentDean.doPost(VisitingStudentDean.java:41)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:720)
 at org.apache.catalina.core.StandardWrapperValve.access$000(StandardWrapperValve.java:118)
 at org.apache.catalina.core.StandardWrapperValve$1.run(StandardWrapperValve.java:278)
 at java.security.AccessController.doPrivileged(Native Method)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:274)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
 at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:158)
 at com.iplanet.ias.web.WebContainer.service(WebContainer.java:850)
Any suggestion is great.
Thanks,

Hi again, Thanks for the reply!,
I understand the part that you mentionned about specifying the database name. That is not what is causing me a problem : I was reffering to an instance. A new feature of MS SQL server 2000 -> you can have multiple SQL server instances, which means that each will have its own set of databases. Kinda like having multiple virtual servers but on the same machine. With ODBC, you can connect to the DEFAULT instance by just specifying the server name only. When you try to connect to a non default instance in ODBC you must specify it like this : '\\server_name\instance_name.'. I have found no way to do this with the type 4 MS driver (writting it like this : '//server/instance' or any other way was unsuccessful). Does anyone know how to do this or if it can be done with the MS driver???
THX, Bye
Andre Carrier

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