Using EJB from another connection pool in WLPI

Hi All,
I've deployed an entity bean (CMP) which used the connection pool other than the
one used by WLPI. When I execute the business operation I've defined for this
bean, the following exception is encountered:
"Couldn't get connection: java.sql.SQLException: Connection has already been created
in this tx context for pool named wlpiPool. Illegal attempt to create connection
from another pool: oraclePool"
Is there any other alternative for me to use the entity bean in WLPI?
Thanks,
Fred

Instead of using mulitiple connection pool,we are using single connection pool.
Our one application, accessing remote db also, for that we are using simple jdbc
connection. No pool.
We also tried OracleXAdriver. In that case, at the time of startup we are getting
weird error.
Thanks
JIgnesh Patel
"Fred" <[email protected]> wrote:
>
I simply turned all my CMP to BMP and get the connection from another
connection
pool. But that was not what I want. Is there any method that allows a
CMP to use
connection pool other than the wlpiPool pool in WLPI?
Thanks
"jignesh" <[email protected]> wrote:
Hi Fred,
We are also getting same error. How did you resolve this error ?
I'd appreciate,if you can post resolution of this error.
Thanks
Jignesh Patel
"Fred" <[email protected]> wrote:
Hi All,
I've deployed an entity bean (CMP) which used the connection pool other
than the
one used by WLPI. When I execute the business operation I've defined
for this
bean, the following exception is encountered:
"Couldn't get connection: java.sql.SQLException: Connection has already
been created
in this tx context for pool named wlpiPool. Illegal attempt to create
connection
from another pool: oraclePool"
Is there any other alternative for me to use the entity bean in WLPI?
Thanks,
Fred

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Edited by: user13376481 on Mar 4, 2013 3:08 AM

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First off, wrong forum section.
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To refer a Ejb from another Ejb include <ejb-ref> in ejb-jar.xml
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<ejb-ref-type>Entity</ejb-ref-type>
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<session>
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Hello,
In my application, I must use two different databases to retrieve
informations...
My application use EJB so I created two pool of connection named pool1 and
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"java.sql.SQLException: Connection has already been created in this tx
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I have found the answer in www.bea.com
http://e-docs.bea.com/wls/docs61/faq/JTA.html#738373
Anybody can help me and give me the more easy,quickly and the more efficient
way to use two database with two different connection pool..
Thanks..
Dephi

Hi
You need to configure TxDataSource with XA connection pool.
More information can be found here:
http://e-docs.bea.com/wls/docs61/jta/thirdpartytx.html
Regards,
Slava Imeshev
[email protected]
"Philippe Da Cunha" <pdacunha@@webraska.com> wrote in message
news:3bfcd6ee$[email protected]..
Hello,
In my application, I must use two different databases to retrieve
informations...
My application use EJB so I created two pool of connection named pool1 and
pool2...
But when I yet used the pool1 to connect to first database and I try touse
the pool2 (to connect to the second database), an SQLException occurs :
"java.sql.SQLException: Connection has already been created in this tx
context for pool named <first pool's name>. Illegal attempt to create
connection from another pool: <second pool's name>"
I have found the answer in www.bea.com
http://e-docs.bea.com/wls/docs61/faq/JTA.html#738373
Anybody can help me and give me the more easy,quickly and the moreefficient
way to use two database with two different connection pool..
Thanks..
Dephi

How to Call one EJB from another

Hi all
I am trying to call one EJB in one system from another EJB residing on diferent system...
Both are Stateless session beans ...
I can't use No-args Intialcontext() as i need to specify the Ip address of other system to be looked up.....
So i am using properties Dorg.omg.CORBA.ORBInitlalHost....
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I hope I am in right path....
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Hi ken Thanks for replying....
Ya i packed it as a jar (using Export tool in Eclipse3.2)....
I am using SUN AS 9.....
I packed bean1 and bean2 as two different jars in the same domain...
Here is my code...
Bean1:
@Stateless(mappedName="ejb/Second")
public class SecondIMPL implements SecondRemote {
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}Bean2 :
@Stateless(mappedName="ejb/First")
public class FirstIMPL implements FirstRemote {
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Client:
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Here is my Stack Trace...
[#|2007-05-24T18:35:17.214+0530|WARNING|sun-appserver-pe9.0|javax.enterprise.system.stream.err|_ThreadID=18;_ThreadName=p: thread-pool-1; w: 19;_RequestID=bb4848e7-829a-421d-a560-93659898eb02;|
javax.naming.NamingException: ejb ref resolution error for remote business interfacecom.SecondRemote[Root exception is java.lang.ClassNotFoundException: com.SecondRemote]
     at com.sun.ejb.EJBUtils.lookupRemote30BusinessObject(EJBUtils.java:350)
     at com.sun.ejb.containers.RemoteBusinessObjectFactory.getObjectInstance(RemoteBusinessObjectFactory.java:61)
     at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:304)
     at com.sun.enterprise.naming.SerialContext.lookup(SerialContext.java:314)
     at javax.naming.InitialContext.lookup(InitialContext.java:351)
     at com.FirstBean.rediff(FirstBean.java:16)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at com.sun.enterprise.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1050)
     at com.sun.enterprise.security.SecurityUtil.invoke(SecurityUtil.java:165)
     at com.sun.ejb.containers.BaseContainer.invokeTargetBeanMethod(BaseContainer.java:2766)
     at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:3847)
     at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:190)
     at com.sun.ejb.containers.EJBObjectInvocationHandlerDelegate.invoke(EJBObjectInvocationHandlerDelegate.java:110)
     at $Proxy36.rediff(Unknown Source)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie._invoke(ReflectiveTie.java:121)
     at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatchToServant(CorbaServerRequestDispatcherImpl.java:650)
     at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(CorbaServerRequestDispatcherImpl.java:193)
     at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequestRequest(CorbaMessageMediatorImpl.java:1705)
     at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:1565)
     at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleInput(CorbaMessageMediatorImpl.java:947)
     at com.sun.corba.ee.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(RequestMessage_1_2.java:178)
     at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:717)
     at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.dispatch(SocketOrChannelConnectionImpl.java:473)
     at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.doWork(SocketOrChannelConnectionImpl.java:1270)
     at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:479)
Caused by: java.lang.ClassNotFoundException: com.Second
     at com.sun.enterprise.loader.EJBClassLoader.findClassData(EJBClassLoader.java:701)
     at com.sun.enterprise.loader.EJBClassLoader.findClass(EJBClassLoader.java:614)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
     at com.sun.ejb.EJBUtils.getBusinessIntfClassLoader(EJBUtils.java:568)
     at com.sun.ejb.EJBUtils.lookupRemote30BusinessObject(EJBUtils.java:320)
     ... 31 more
|#]

Weblogic Server 9.2 Crashes when using the JMS Wrapped Connection Pooling.

===== BEGIN DUMP =============================================================
JRockit dump produced after 0 days, 01:05:05 on Thu Sep 16 18:27:36 2010
Additional information is available in:
E:\obopay\servers\EWP_9.2_Domain\jrockit.4516.dump
E:\obopay\servers\EWP_9.2_Domain\jrockit.4516.mdmp
If you see this dump, please open a support case with BEA and
supply as much information as you can on your system setup and
the program you were running. You can also search for solutions
to your problem at http://forums.bea.com in
the forum jrockit.developer.interest.general.
Error Message: Illegal memory access. [54]
Exception Rec: EXCEPTION_ACCESS_VIOLATION (c0000005) at 0x0095065F - memory at 0x00740060 could not be read.
Minidump : Wrote mdmp. Size is 567MB
SafeDllMode : -1
Version : BEA JRockit(R) R27.2.0-131-78843-1.5.0_10-20070320-1457-windows-ia32
GC Mode : Garbage collection optimized for throughput
GC Strategy : Generational Parallel Mark & Sweep
: Current OC phase is: not running. YC is not running.
: GC strategy for GC 36 was genparpar
: GC strategy for GC 37 was genparpar
: GC strategy for GC 38 was genparpar
: GC strategy for GC 39 was genparpar
: GC strategy for GC 40 was genparpar
: mmHeap->data = 0x00C00000, mmHeap->top = 0x10C00000
: The nurserylist starts at 0x01BE75E8 and ends at 0x0CB52440
: mmStartCompaction = 0x00C00000, mmEndCompaction = 0x01C00000
: References are 32-bit.
CPU : Intel Pentium III/Pentium III Xeon SSE SSE2 SSE3 SSSE3 EM64T
Number CPUs : 2
Tot Phys Mem : 3451408384 (3291 MB)
OS version : Microsoft Windows XP version 5.1 Service Pack 3 (Build 2600) (32-bit)
Thread System: Windows Threads
State : JVM is running
Command Line : -Djava.library.path=E:\bea\jrockit90_150_10\bin;E:\bea\jrockit90_150_10\jre\bin;E:\bea\weblogic92\server\native\win\32;E:\bea\weblogic92\server\bin;E:\bea\weblogic92\server\native\win\32\oci920_8 -Dweblogic.management.discover=false -Dplatform.home=E:\bea\weblogic92 -Dwls.home=E:\bea\weblogic92\server -Dwli.home=E:\bea\weblogic92\integration -Dweblogic.Name=myserver -Dweblogic.management.username=weblogic -Dweblogic.management.password=weblogic -Dweblogic.ext.dirs=E:\bea\patch_weblogic901\profiles\default\sys_manifest_classpath\weblogic_patch.jar Djava.security.auth.login.config=E://workspace/Bhopal/LoginModulesConfig/ewp_loginmodules.config -Djava.naming.factory.initial.ewp.remote=weblogic.jndi.WLInitialContextFactory -Dcom.ewp.proxy.is_remote=false -Djava.naming.provider.url.ewp.remote=t3://localhost:7001 -Dweblogic.webservice.verbose=true -Dweblogic.log.Log4jLoggingEnabled=true -Dweblogic.security.SSL.ignoreHostnameVerification=true Xdebug -Xnoagent -Dcom.sun.management.jmxremote -Xms256m -Xmx1024m -Dsun.java.launcher=SUN_STANDARD weblogic.Server
java.home : E:\bea\jrockit90_150_10\jre
JAVA_HOME : <not set>
JAVAOPTIONS: <not set>
PATH : E:\bea\jrockit90_150_10\jre\bin;E:\oracle\product\10.2.0\client_1\bin;C:\Program Files\PC Connectivity Solution\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\Intel\DMIX;C:\Program Files\TortoiseSVN\bin
C Heap : Good; no memory allocations have failed
StackOverFlow: 0 StackOverFlowErrors have occured
OutOfMemory : 0 OutOfMemoryErrors have occured
Registers (from ThreadContext: 0x4B29E378 / OS context: 0x4B29E764):
eax = 00740060 ecx = 00740060 edx = 45a45ba0 ebx = 08c953b8
esp = 4b29ea30 ebp = 00000000 esi = 4b29ea60 edi = 4b29efb4
es = 00000023 cs = 0000001b ss = 00000023 ds = 00000023
fs = 0000003b gs = 00000000
eip = 0095065f eflags = 00010206
Stack:
(* marks the word pointed to by the stack pointer)
4b29ea30: 00981099* 08c953b8 008ab310 4b29eb34 09e5c308 009810ea
4b29ea48: 4b29ead8 0098ecd2 4b29ea60 4b29ea90 48bd8960 48bd8960
4b29ea60: 00000001 45aa0278 45a45ba0 00000007 00000000 08c953b8
4b29ea78: 08512180 4b29ef60 00000000 09d56368 09d563b0 4b29efb4
Code:
(* marks the word pointed to by the instruction pointer)
0095062c: 5e5f0cc4 c35bc033 01b85e5f 5b000000 ccccccc3 0424448b
00950644: a5f06ca3 ccccc300 cccccccc 04244c8b 01a8018b e0830774
0095065c: 8bc88bfe* 40788301 44408b03 af0f0a75 c0830841 f8e08317
00950674: ccccccc3 cccccccc cccccccc 0424448b 00f4888b 158b0000
Loaded modules:
(* denotes the module causing the exception)
00400000-0040ffff E:\bea\jrockit90_150_10\bin\javaw.exe
7c900000-7c9b1fff C:\WINDOWS\system32\ntdll.dll
7c800000-7c8f5fff C:\WINDOWS\system32\kernel32.dll
7e410000-7e4a0fff C:\WINDOWS\system32\USER32.dll
77f10000-77f58fff C:\WINDOWS\system32\GDI32.dll
77dd0000-77e6afff C:\WINDOWS\system32\ADVAPI32.dll
77e70000-77f02fff C:\WINDOWS\system32\RPCRT4.dll
77fe0000-77ff0fff C:\WINDOWS\system32\Secur32.dll
77c10000-77c67fff C:\WINDOWS\system32\MSVCRT.dll
76390000-763acfff C:\WINDOWS\system32\IMM32.DLL
00820000-00a9cfff *E:\bea\jrockit90_150_10\jre\bin\jrockit\jvm.dll
76b40000-76b6cfff C:\WINDOWS\system32\WINMM.dll
71ab0000-71ac6fff C:\WINDOWS\system32\WS2_32.dll
71aa0000-71aa7fff C:\WINDOWS\system32\WS2HELP.dll
7c340000-7c395fff E:\bea\jrockit90_150_10\bin\MSVCR71.dll
5dac0000-5dac7fff C:\WINDOWS\system32\rdpsnd.dll
76360000-7636ffff C:\WINDOWS\system32\WINSTA.dll
5b860000-5b8b4fff C:\WINDOWS\system32\NETAPI32.dll
76bf0000-76bfafff C:\WINDOWS\system32\PSAPI.DLL
6d700000-6d70bfff E:\bea\jrockit90_150_10\jre\bin\verify.dll
6d370000-6d38cfff E:\bea\jrockit90_150_10\jre\bin\java.dll
6d2f0000-6d2f7fff E:\bea\jrockit90_150_10\jre\bin\hpi.dll
6d720000-6d72efff E:\bea\jrockit90_150_10\jre\bin\zip.dll
6d520000-6d527fff E:\bea\jrockit90_150_10\jre\bin\management.dll
6d530000-6d542fff E:\bea\jrockit90_150_10\jre\bin\net.dll
71a50000-71a8efff C:\WINDOWS\system32\mswsock.dll
662b0000-66307fff C:\WINDOWS\system32\hnetcfg.dll
71a90000-71a97fff C:\WINDOWS\System32\wshtcpip.dll
41c00000-41c26fff C:\WINDOWS\system32\DNSAPI.dll
41c30000-41c37fff C:\WINDOWS\System32\winrnr.dll
41c40000-41c6bfff C:\WINDOWS\system32\WLDAP32.dll
41c80000-41c85fff C:\WINDOWS\system32\rasadhlp.dll
68000000-68035fff C:\WINDOWS\system32\rsaenh.dll
769c0000-76a73fff C:\WINDOWS\system32\USERENV.dll
438b0000-438b8fff E:\bea\jrockit90_150_10\jre\bin\nio.dll
41ba0000-41ba9fff E:\bea\jrockit90_150_10\jre\bin\jmapi.dll
41bb0000-41bbdfff E:\bea\weblogic92\server\native\win\32\wlfileio2.dll
43ce0000-43cf8fff C:\WINDOWS\system32\iphlpapi.dll
43d10000-43d27fff C:\WINDOWS\system32\MPRAPI.dll
77cc0000-77cf1fff C:\WINDOWS\system32\ACTIVEDS.dll
43d30000-43d54fff C:\WINDOWS\system32\adsldpc.dll
43d60000-43d70fff C:\WINDOWS\system32\ATL.DLL
43d80000-43ebcfff C:\WINDOWS\system32\ole32.dll
43ec0000-43f4afff C:\WINDOWS\system32\OLEAUT32.dll
43f50000-43f5dfff C:\WINDOWS\system32\rtutils.dll
71bf0000-71c02fff C:\WINDOWS\system32\SAMLIB.dll
43f60000-44052fff C:\WINDOWS\system32\SETUPAPI.dll
44060000-44064fff E:\bea\weblogic92\server\native\win\32\wlntio.dll
44540000-44545fff E:\bea\jrockit90_150_10\jre\bin\rmi.dll
4d010000-4d122fff E:\bea\jrockit90_150_10\jre\bin\dbghelp.dll
"[STANDBY] ExecuteThread: '21' f" id=87 idx=0xf0 tid=4208 lastJavaFrame=0x4B29EB4C
Stack 0: start=0x4B260000, end=0x4B2A0000, guards=0x4B263000 (ok), forbidden=0x4B261000
Thread Stack Trace:
at _mmGetPossibleMovedObjectSize+15()@0x0095065F
at _refIterInit+393()@0x00981099
at _refIterInit+474()@0x009810EA
at _trProcessLocksForThread+66()@0x0098ECD2
at _javalockCouldBeLock+1047()@0x008AB417
at _javalockConvertThinToFat+42()@0x008AC13A
at RJNIjrockit_vm_Locks_convertThinLockedToFatLocked@8+15()@0x00986B1F
-- Java stack --
at jrockit/vm/Locks.convertThinLockedToFatLocked(Ljava/lang/Object;)V(Native Method)
at jrockit/vm/Locks.createMonitorAndConvert(Ljava/lang/Object;Z)Ljrockit/vm/ObjectMonitor;(Unknown Source)
at java/lang/Object.wait(J)V(Native Method)
at java/lang/Object.wait(Object.java:474)
at weblogic/common/CompletionRequest.getResult(CompletionRequest.java:109)
^-- Holding lock: weblogic/common/CompletionRequest@0x09E5C2A8[thin lock]
at weblogic/store/gxa/internal/GXATransactionImpl.commitStoreIO(GXATransactionImpl.java:99)
at weblogic/store/gxa/internal/GXATransactionImpl.doOperationCallbacks(GXATransactionImpl.java:215)
at weblogic/store/gxa/internal/GXAResourceImpl.commit(GXAResourceImpl.java:1448)
at weblogic/transaction/internal/XAServerResourceInfo.commit(XAServerResourceInfo.java:1333)
at weblogic/transaction/internal/XAServerResourceInfo.commit(XAServerResourceInfo.java:577)
at weblogic/transaction/internal/ServerSCInfo.startCommit(ServerSCInfo.java:514)
at weblogic/transaction/internal/ServerTransactionImpl.localCommit(ServerTransactionImpl.java:1993)
at weblogic/transaction/internal/ServerTransactionImpl.globalRetryCommit(ServerTransactionImpl.java:2658)
at weblogic/transaction/internal/ServerTransactionImpl.globalCommit(ServerTransactionImpl.java:2580)
at weblogic/transaction/internal/ServerTransactionImpl.internalCommit(ServerTransactionImpl.java:278)
at weblogic/transaction/internal/ServerTransactionImpl.commit(ServerTransactionImpl.java:227)
at weblogic/deployment/jms/WrappedTransactionalSession.delistFromTransaction(WrappedTransactionalSession.java:258)
^-- Holding lock: weblogic/deployment/jms/PooledSession_weblogic_jms_client_JMSXASession@0x09D56368[thin lock]
at weblogic/deployment/jms/WrappedMessageProducer.send(WrappedMessageProducer.java:149)
at com/obopay/jms/helper/BaseQueueHelper.sendMessage(BaseQueueHelper.java:107)
The above is the jrockit crash dump file..
I am using the JMS Wrapper Connection Poooling provided by Weblogic. When i use Jmeter and do the load testing for around 10 users, the server gets crashed.
I doubt something is going wrong with the Weblogic JMS Connection Pooling, please help me..

The problem doesn't look like it has anything to do with wappers per se. The stack indicates that the JVM died when the persistent store tried to invoke a standard Java synchronize operation. JVM crashes need to be analyzed by a JVM expert, so I second the suggestion to solicit help from JVM experts and/or filing a case with customer support. In the mean-time, you can probably work-around the issue by either (A) ensuring you have a recent version of the JVM installed, or (B) temporarily switching to the Sun JVM.
Regards,
tom
Edited by: TomB on Sep 17, 2010 2:33 PM

JBO-33035: Row currency has changed; Using snapshots from another DB

I receive this error due to a snapshot performing a complete refresh. It is not due to the user hitting the Back button in the browser. How can you get around this scenario. The page has been rendered, the user navigates somewhere else via some link, and the jbo-29000 and 33035 errors get thrown because of the snapshot having refreshed. It's not an option to stop using the snapshot. I have already tested setting 'Enable Token Validation' to false on the object. Still get the error. Any suggestions?

Hi,
I assume you use JavaServer Faces, correct ? In this case go to the starting page's pagedef file and opn the Structure Window
- select the "bindings" node and create an "action" that you bind to the ViewObject execute() operation (If you use EJB or POJO, crate a methd binding)
- in the "executables" section create an "invokeAction" pointing to the action created before
- under refresh conditions, add #{!adfFacesContext.postback} so the iterator is refreshed when you navigate back from another page.
This should solve the problem
Frank

Monitoring EJB from another application

Hi!
Let's say: We have some EJB deployed of Application Server. Each EJB (doesn't metter if session or entity) has its methods that can be called. (All EJB are in the same application)
Can I from another application see what methods has been called and at what time? I can extend monitored application with its log files, but want to use application to be monitored as is.
I guess it depends on Application Server functionality. I would like to do it on SUN reference implementation (from J2EE SDK). If there is another App Server (the best free one) please note.
I would be very thankfull for any answer.
Marcin

You could use the opensource EJB-container JBOSS and modify the source to perform logging of when a particular method was called etc.
This will enable you to run the application as is with no modifications.
Morten.

Best way to use Sun Web Server connection pooling with Web Application?

I have a number of applications that run Oracle and MySQL queries via Sun Web Server 6.1. I use the Web Server's built-in connection pooling, which works fairly well.
As an interface with the connections I receive from the Web Server, I use a class, which (1) accepts the SQL and database name from a tool, (2) Opens the connection, runs the SQL, closes the connection, (3) puts the content of the result set into a Vector of Hashtables, (4) returns that Vector to the tool.
Why do I use this Vector? That way, in my applications, I don't have to deal with opening connections (or getting them from the pool) and I don't have to worry about closing connections, because that's done automatically by the interface class.
Is this a dumb approach to use? I'm a bit paranoid about open DB connections, because we have had a number of problems where connections would not be closed, go stale in oracle, and clog up the database resources.
Can you suggest a better way to (1) smartly control opening and closing connections, and (2) enabling fast database access?
Sorry, but given this Java/Sun Web Server double topic, I'm going to post the same message on the Web Server board.
Any tips?
dailysun
P.S. For instance, in my tool, I call the interface class in this manner:
Vector results_v = Database.getSelect("SELECT * FROM TEST","database1");
getSelect uses the first string as the SQL and the second string as the jndi name of the Web server's database resource. getSelect does all the context stuff to get a connection from the pool, runs the SQL, puts the resultset into a Vector of Hastables (where each row is one Hashtable), and returns the Vector.

I have a number of applications that run Oracle and MySQL queries via Sun Web Server 6.1. I use the Web Server's built-in connection pooling, which works fairly well.
As an interface with the connections I receive from the Web Server, I use a class, which (1) accepts the SQL and database name from a tool, (2) Opens the connection, runs the SQL, closes the connection, (3) puts the content of the result set into a Vector of Hashtables, (4) returns that Vector to the tool.
Why do I use this Vector? That way, in my applications, I don't have to deal with opening connections (or getting them from the pool) and I don't have to worry about closing connections, because that's done automatically by the interface class.
Is this a dumb approach to use? I'm a bit paranoid about open DB connections, because we have had a number of problems where connections would not be closed, go stale in oracle, and clog up the database resources.
Can you suggest a better way to (1) smartly control opening and closing connections, and (2) enabling fast database access?
Sorry, but given this Java/Sun Web Server double topic, I'm going to post the same message on the Web Server board.
Any tips?
dailysun
P.S. For instance, in my tool, I call the interface class in this manner:
Vector results_v = Database.getSelect("SELECT * FROM TEST","database1");
getSelect uses the first string as the SQL and the second string as the jndi name of the Web server's database resource. getSelect does all the context stuff to get a connection from the pool, runs the SQL, puts the resultset into a Vector of Hastables (where each row is one Hashtable), and returns the Vector.

Using EJB from another connection pool in WLPI

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