ClassCastException casting CallableStatement into OracleCallableStatement

Well, i have configured Jakarta DBCP 1.1 with Jakarta Tomcat 4.1.29, JDK 1.4.2, with a database Oracle 9i over Win32 Platform.
Everything works fine if i use Statements and make SQL sentences. But when i try to execute a stored procedure with a callable statement, i need to pass it a CLOB parameter, so i need to cast a CallableStatement into a OracleCallableStatement, to use the Oracle Extensions. This process makes a ClassCastException.
This process works fine without DBCP, using just a connection, but fails when use DBCP connection pool.
I have tried to cast the Connection into OracleConnection that i get from the pool, but i get the same error. Also I have checked Connection is not null and connection works.
Could anyone gimme a solution? Thanx for your help!

Can't you use method getClob from CallableStatement, and then pass the data to the clob using setCharacterStream(...)?
BTW, I think DBCP wraps the genuine Oracle classes, which is the reason that your objects are not instances of Oracles classes.

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ClassCastException casting CallableStatement to OracleCallableStatement

Im trying to create a ViewObject based on a REF_CURSOR returned by PL/SQL stored procedure OUT parameter.
I casted the normal CallableStatement to OracleCallableStatement so I can call the OracleCallableStatement.getCursor(index);
CallableStatement statement = getDbTransaction.createCallableStatement(statementString, DbTransaction.DEFAULT);
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Jdeveloper version is Jdev10.1.3.1 Preview.
regards,
Anton

I got a resolution for this. The reason for this exception is that I got the wrong import for the OracleCallableStatement. The correct import is "import oracle.jdbc.OracleCallableStatement" instead of "import oracle.jdbc.driver.OracleCallableStatement"
See the related thread:
Re: Dive into BC4J related --REF CURSOR (executeQueryForCollection)
regards,
Anton

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Hi all,
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     at java.lang.Thread.run(Thread.java:595)And here is my connection config
Struts Web.xml file
<resource-ref>
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              maxWait="-1"/> Edited by: ziggy on Sep 26, 2008 4:02 PM

ziggy wrote:
OracleCallableStatement cst = (OracleCallableStatement)conn.prepareCall(stp.SUBMIT_CONSIGNMENT_STORED_PROC);
java.lang.ClassCastException: org.apache.tomcat.dbcp.dbcp.DelegatingCallableStatement
Why are you casting CallableStatement to OracleCallableStatement? The JDBC API is intented to be completely implementation independent. Never cast interfaces to implementation specific classes, it will break your app sooner or later.

ClassCastException - While type casting Home object after EJB JNDI Lookup

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==============================================
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}==============================================
The class name is dislpayed as the Stub class name.
While displaying the interfaces, the Home Interface name is displayed.
But later when I try to type cast it into Home Interface type, it throws a ClassCastException.
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ClassCastException with OracleCallableStatement

Hi,
I am porting our application from WLS6.0 sp2 to WLS6.1 and have encountered the
above error. As far as I can see, nothing in our code has changed (I just rebuilt
against the WLS6.1 libraries and deployed to the new server)
Thanks for any help.
Gino
Stack trace below :
java.sql.SQLException: java.lang.ClassCastException: oracle.jdbc.driver.OracleCallableStatement
at weblogic.jdbc.jts.CallableStatement.clearParameters(CallableStatement.java:220)
at weblogic.jdbc.rmi.internal.CallableStatementImpl.clearParameters(CallableStatementImpl.java:368)
at weblogic.jdbc.rmi.SerialCallableStatement.clearParameters(SerialCallableStatement.java:444)
at com.banctec.caseware.server.dbaccess.dao.helper.DaoParameterHelper.bindToStatement(DaoParameterHelper.java:977)
at com.banctec.caseware.server.dbaccess.dao.helper.DaoParameterHelper.bindToStatement(DaoParameterHelper.java:1170)
at com.banctec.caseware.server.dbaccess.dao.CaseDAOOracle.insertRow(CaseDAOOracle.java:126)
at com.banctec.caseware.server.dbaccess.dao.CaseDAO.insert(CaseDAO.java:190)
at com.banctec.caseware.server.dbaccess.DBAccessBean.insert(DBAccessBean.java:243)
at com.banctec.caseware.server.dbaccess.DBAccessBean_m9wwam_EOImpl.insert(DBAccessBean_m9wwam_EOImpl.java:389)
at com.banctec.caseware.server.casehandler.CaseHandlerBean.createResource(CaseHandlerBean.java:1286)
at com.banctec.caseware.server.casehandler.CaseHandlerBean_nn9cfa_EOImpl.createResource(CaseHandlerBean_nn9cfa_EOImpl.java:475)
at com.banctec.caseware.server.cpc.CPCBean.createResource(CPCBean.java:682)
at com.banctec.caseware.server.cpc.CPCBean_1fna_EOImpl.createResource(CPCBean_1fna_EOImpl.java:387)
at com.banctec.caseware.server.cpc.CPCBean_1fna_EOImpl_WLSkel.invoke(Unknown
Source)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:288)
at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java:93)
at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:257)
at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:22)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)

http://e-docs.bea.com/wls/docs60/notes/issues.html#1024261
Oracle offers several non-standard (not approved by Sun) extensions to JDBC:
OracleConnection
OracleStatement
OracleResultSet
OraclePreparedStatement
OracleCallableStatement
If a user attempts to use these classes within an application that gets its
connection using WebLogic Server JDBC, they will not work.
"Gino Coccia" <[email protected]> wrote in message
news:[email protected]...
>
Hi,
I am porting our application from WLS6.0 sp2 to WLS6.1 and haveencountered the
above error. As far as I can see, nothing in our code has changed (I justrebuilt
against the WLS6.1 libraries and deployed to the new server)
Thanks for any help.
Gino
Stack trace below :
java.sql.SQLException: java.lang.ClassCastException:oracle.jdbc.driver.OracleCallableStatement
atweblogic.jdbc.jts.CallableStatement.clearParameters(CallableStatement.java:2
20)
atweblogic.jdbc.rmi.internal.CallableStatementImpl.clearParameters(CallableSta
tementImpl.java:368)
atweblogic.jdbc.rmi.SerialCallableStatement.clearParameters(SerialCallableStat
ement.java:444)
atcom.banctec.caseware.server.dbaccess.dao.helper.DaoParameterHelper.bindToSta
tement(DaoParameterHelper.java:977)
atcom.banctec.caseware.server.dbaccess.dao.helper.DaoParameterHelper.bindToSta
tement(DaoParameterHelper.java:1170)
atcom.banctec.caseware.server.dbaccess.dao.CaseDAOOracle.insertRow(CaseDAOOrac
le.java:126)
atcom.banctec.caseware.server.dbaccess.dao.CaseDAO.insert(CaseDAO.java:190)
atcom.banctec.caseware.server.dbaccess.DBAccessBean.insert(DBAccessBean.java:2
43)
atcom.banctec.caseware.server.dbaccess.DBAccessBean_m9wwam_EOImpl.insert(DBAcc
essBean_m9wwam_EOImpl.java:389)
atcom.banctec.caseware.server.casehandler.CaseHandlerBean.createResource(CaseH
andlerBean.java:1286)
atcom.banctec.caseware.server.casehandler.CaseHandlerBean_nn9cfa_EOImpl.create
Resource(CaseHandlerBean_nn9cfa_EOImpl.java:475)
atcom.banctec.caseware.server.cpc.CPCBean.createResource(CPCBean.java:682)
atcom.banctec.caseware.server.cpc.CPCBean_1fna_EOImpl.createResource(CPCBean_1
fna_EOImpl.java:387)
atcom.banctec.caseware.server.cpc.CPCBean_1fna_EOImpl_WLSkel.invoke(Unknown
Source)
atweblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:288)
atweblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java
:93)
atweblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:257)
atweblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:2
2)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:137)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)

How to cast an Object into a specific type (Integer/String) at runtime

Problem:
How to cast an Object into a specific type (Integer/String) at runtime, where type is not known at compile time.
Example:
public class TestCode {
     public static Object func1()
Integer i = new Integer(10); //or String str = new String("abc");
Object temp= i; //or Object temp= str;
return temp;
     public static void func2(Integer param1)
          //Performing some stuff
     public static void main(String args[])
     Object obj = func1();
//cast obj into Integer at run time
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Description:
In example, func1() will be called first which will return an object. Returned object refer to an Integer object or an String object. Now at run time, I want to cast this object to the class its referring to (Integer or String).
For e.g., if returned object is referring to Integer then cast that object into Integer and call func2() by passing Integer object.

GDS123 wrote:
Problem:
How to cast an Object into a specific type (Integer/String) at runtime, where type is not known at compile time.
There is only one way to have an object of an unknown type at compile time. That is to create the object's class at runtime using a classloader. Typically a URLClassloader.
Look into
Class.ForName(String)

CastCastException with OracleCallableStatement

I'm trying to use Oracle JDBC extensions with the Oracle thin Driver (to
read a cursor returned by a PL/SQL function). When I attempt to cast a
CallableStatement to an weblogic.jdbc.vendor.oracle.OracleCallableStatement,
the weblogic wrapper class, I still get the same ClassCastException as if I
try to cast to a vanilla OracleCallableStatement. I thought the weblogic
class was the fix to this problem.
Code is:
ResultSet rs =
((weblogic.jdbc.vendor.oracle.OracleCallableStatement)cs).getCursor(1);
Exception is:
java.sql.SQLException: java.lang.ClassCastException:
oracle.jdbc.driver.OracleCallableStatement
It's interesting that the exception is for
oracle.jdbc.driver.CallableStatement, even though I'm casting to the
Weblogic wrapper class.
Weblogic version is 6.1 sp2
Oracle is 8.1.6
Does anyone know what's happeneng here, and how to fix it.
Any help much appreciated
John

Unfortunatly, this doesn't work either - it doesn't understand the new type:
java.sql.SQLException: Invalid column type
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:180)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:222)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:285)
at
oracle.jdbc.driver.OracleStatement.get_internal_type(OracleStatement.java:53
40)
at
oracle.jdbc.driver.OracleCallableStatement.registerOutParameter(OracleCallab
leStatement.java:245)
at
oracle.jdbc.driver.OracleCallableStatement.registerOutParameter(OracleCallab
leStatement.java:370)
at
weblogic.jdbc.jts.Statement.registerOutParameter(Statement.java:973)
at
weblogic.jdbc.rmi.internal.CallableStatementImpl.registerOutParameter(Callab
leStatementImpl.java:53)
at
weblogic.jdbc.rmi.SerialCallableStatement.registerOutParameter(SerialCallabl
eStatement.java:48)
at com.bluedot.beans.support.ProcedureBuffer.executeFunction(Unknown
Source)
at
com.bluedot.beans.support.ProcedureBuffer.executeTagSetFunction(Unknown
Source)
at
com.bluedot.beans.entityManagement.EntityManagementServerBean.getExhibitorSt
ats(Unknown Source)
at
com.bluedot.beans.entityManagement.EntityManagementServerBean_7yjcm7_EOImpl.
getExhibitorStats(EntityManagemen
tServerBean_7yjcm7_EOImpl.java:37)
etc
"Slava Imeshev" <[email protected]> wrote in message
news:[email protected]...
OK. Now it's clear. You can not use OracleTypes.CURSOR.
In order to get a result set from cursor, the right sequence
should be following:
cs.registerOutParameter(1, java.sql.Types.OTHER);
cs.execute();
ResultSet rs = cstmt.getResultSet(1);
Regards,
Slava Imeshev
"John Prout" <[email protected]> wrote in message
news:[email protected]...
Slava
Here's part of the stack trace - the whole thing is probably 100 lines:
java.sql.SQLException: java.lang.ClassCastException:
oracle.jdbc.driver.OracleCallableStatement
at
weblogic.jdbc.jts.CallableStatement.getCursor(CallableStatement.java:277)
at
weblogic.jdbc.rmi.internal.CallableStatementImpl.getCursor(CallableStatement
Impl.java:420)
at
weblogic.jdbc.rmi.SerialCallableStatement.getCursor(SerialCallableStatement.
java:496)
at
com.bluedot.beans.support.ProcedureBuffer.executeTagSetFunction(Unknown
Source)
at
com.bluedot.beans.entityManagement.EntityManagementServerBean.getExhibitorSt
ats(Unknown Source)
at
com.bluedot.beans.entityManagement.EntityManagementServerBean_7yjcm7_EOImpl.
getExhibitorStats(EntityManagemen
tServerBean_7yjcm7_EOImpl.java:421)
at
com.bluedot.beans.entityManagement.EntityManagementServerBean_7yjcm7_EOImpl_
WLSkel.invoke(Unknown Source)
at
weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:296)
As you can see, the PL/SQL code is being called from an EJB.
The connection is obtained through JNDI:
java.sql.Connection conn = null;
Hashtable ht = new Hashtable() ;
ht.put( Context.INITIAL_CONTEXT_FACTORY ,
"weblogic.jndi.WLInitialContextFactory" );
InitialContext ctx = new InitialContext( ht ) ;
if ( ctx == null ) return null ;
String dataSource = getUserSession().getDatabase() ;
javax.sql.DataSource source = (javax.sql.DataSource) ctx.lookup(
dataSource ) ;
if ( source != null )
conn = source.getConnection() ;
Then the CallableStatement is obtained and used:
OracleConnection con = null ;
OracleCallableStatement cs = null ;
Object returnValue = null;
ResultSet rs = null ;
// String in the form: { ? = call <procedure-name>[<arg1>,<arg2>,...]}
StringBuffer buff = new StringBuffer();
buff.append("{ ? = call ").append(functionName).append("()") ;
// setup mStringBuffer and mStringLength so the rest of the class will
work right
buff.getChars(0, buff.length(),mStringBuffer,0);
mStringLength = buff.length();
con = (OracleConnection)psc.getDatabaseConnection() ;
cs = (OracleCallableStatement)con.prepareCall( buff.toString() ) ;
cs.registerOutParameter(1, OracleTypes.CURSOR);
// printQuery( psc ) ;
boolean result = cs.execute() ; // It's not in the API what "result"
is...
rs =
((weblogic.jdbc.vendor.oracle.OracleCallableStatement)cs).getCursor(1);
The exception happens when I call getCursor(1)
This code works outside weblogic, using a connection I obtain usingstandard
JDBC and the Oracle thin driver.
The sample is extracted from several pieces of the real code, so therecould
be compile errors, etc
John
"Slava Imeshev" <[email protected]> wrote in message
news:[email protected]...
Hi John,
Could you post the questionable code and the full exception?
From information provided it's not clear whether this exception
is thown from the server or from the app.
Regards,
Slava Imeshev
"John Prout" <[email protected]> wrote in message
news:[email protected]...
I am getting a connection from a standard weblogic connection pool,
using
a
JNDI lookup. I can see no way to directly obtain a
weblogic.jdbc.vendor.oracle.OracleConnection. If I cast everything to
the
weblogic OracleConnection and OracleCallableStatement, I still get thesame
ClassCastException
Can you post an example of how to get the
weblogic.jdbc.vendor.oracle.OracleConnection
Thanks
John
"Slava Imeshev" <[email protected]> wrote in message
news:[email protected]...
Hi John,
This exception is thrown because plain oracle connection was used.
To use weblogic oracle extensions, connection should be obtained
from the connection pool, either via DataSource or directly.
Regards,
Slava Imeshev
"John Prout" <[email protected]> wrote in message
news:[email protected]...
I'm trying to use Oracle JDBC extensions with the Oracle thin Driver
(to
read a cursor returned by a PL/SQL function). When I attempt to cast a
CallableStatement to anweblogic.jdbc.vendor.oracle.OracleCallableStatement,
the weblogic wrapper class, I still get the same ClassCastException as
if
I
try to cast to a vanilla OracleCallableStatement. I thought the
weblogic
class was the fix to this problem.
Code is:
ResultSet rs =
((weblogic.jdbc.vendor.oracle.OracleCallableStatement)cs).getCursor(1);
>>>
Exception is:
java.sql.SQLException: java.lang.ClassCastException:
oracle.jdbc.driver.OracleCallableStatement
It's interesting that the exception is for
oracle.jdbc.driver.CallableStatement, even though I'm casting to the
Weblogic wrapper class.
Weblogic version is 6.1 sp2
Oracle is 8.1.6
Does anyone know what's happeneng here, and how to fix it.
Any help much appreciated
John

ClassCastException casting CallableStatement into OracleCallableStatement

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