Retrieving BLOB in CMP2.0 from Oracle 8.1.7.3

Hi all,
In one of our project we are using CMP 2.0 and WLS8.1 SP2. While storing BLOB into Oracle (8.1.7) database we are not facing any issue.
But retrieving the BLOB from the database throwing error.
In weblogic.cmp.jar.xml I have defined the database column as below
<field-map>
<cmp-field>pendingUser</cmp-field>
<dbms-column>PENDING_USER</dbms-column>
<dbms-column-type>OracleBlob</dbms-column-type>
</field-map>
Stack trace of the issue is below
javax.ejb.FinderException: Exception executing finder 'findByAdministrator':
java.io.StreamCorruptedException: invalid stream header
java.io.StreamCorruptedException: invalid stream header
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:737)
at java.io.ObjectInputStream.<init>(ObjectInputStream.java:253)
at com.boa.gcib.docwf.ecf.ejbs.pendinguser.PendingUserEntity_2zvzps__WebLo
gic_CMP_RDBMS.__WL_set_pendingUserForInput(PendingUserEntity_2zvzps__WebLogic_CMP_
RDBMS.java:2258)
at com.boa.gcib.docwf.ecf.ejbs.pendinguser.PendingUserEntity_2zvzps__WebLo
gic_CMP_RDBMS.__WL_loadGroup0FromRS(PendingUserEntity_2zvzps__WebLogic_CMP_RDBMS.j
ava:868)
at com.boa.gcib.docwf.ecf.ejbs.pendinguser.PendingUserEntity_2zvzps__WebLo
gic_CMP_RDBMS.__WL_loadGroupByIndex(PendingUserEntity_2zvzps__WebLogic_CMP_RDBMS.j
ava:1100)
at weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.loadBeanFromRS(RDBMSPe
rsistenceManager.java:428)
at weblogic.ejb20.manager.DBManager.getBeanFromRS(DBManager.java:1435)
at weblogic.ejb20.manager.BaseEntityManager.getBeanFromRS(BaseEntityManage
r.java:1207)
at weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.getBeanFromRS(RDBMSPer
sistenceManager.java:2015)
at com.boa.gcib.docwf.ecf.ejbs.pendinguser.PendingUserEntity_2zvzps__WebLo
gic_CMP_RDBMS.ejbFindByAdministrator(PendingUserEntity_2zvzps__WebLogic_CMP_RDBMS.
java:537)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.ja
va:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccesso
rImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.collectionFinder(RDBMS
PersistenceManager.java:378)
at weblogic.ejb20.manager.BaseEntityManager.collectionFinder(BaseEntityMan
ager.java:1700)
at weblogic.ejb20.manager.BaseEntityManager.collectionFinder(BaseEntityMan
ager.java:1672)
at weblogic.ejb20.internal.EntityEJBHome.finder(EntityEJBHome.java:560)
at com.boa.gcib.docwf.ecf.ejbs.pendinguser.PendingUserEntity_2zvzps_HomeIm
pl.findByAdministrator(PendingUserEntity_2zvzps_HomeImpl.java:128)
at com.boa.gcib.docwf.ecf.ejbs.user.UserManagerBean.getRequestedAccounts(U
serManagerBean.java:1158)
at com.boa.gcib.docwf.ecf.ejbs.user.UserManager_iq4580_EOImpl.getRequested
Accounts(UserManager_iq4580_EOImpl.java:46)
at com.boa.gcib.docwf.ecf.ejbs.user.UserManager_iq4580_EOImpl_WLSkel.invok
e(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:477)
at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef
.java:108)
at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:420)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedS
ubject.java:353)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:14
4)
at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:
415)
at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.j
ava:30)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
at com.boa.gcib.docwf.ecf.ejbs.pendinguser.PendingUserEntity_2zvzps__WebLo
gic_CMP_RDBMS.ejbFindByAdministrator(PendingUserEntity_2zvzps__WebLogic_CMP_RDBMS.
java:556)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.ja
va:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccesso
rImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.collectionFinder(RDBMS
PersistenceManager.java:378)
at weblogic.ejb20.manager.BaseEntityManager.collectionFinder(BaseEntityMan
ager.java:1700)
at weblogic.ejb20.manager.BaseEntityManager.collectionFinder(BaseEntityMan
ager.java:1672)
at weblogic.ejb20.internal.EntityEJBHome.finder(EntityEJBHome.java:560)
at com.boa.gcib.docwf.ecf.ejbs.pendinguser.PendingUserEntity_2zvzps_HomeIm
pl.findByAdministrator(PendingUserEntity_2zvzps_HomeImpl.java:128)
at com.boa.gcib.docwf.ecf.ejbs.user.UserManagerBean.getRequestedAccounts(U
serManagerBean.java:1158)
at com.boa.gcib.docwf.ecf.ejbs.user.UserManager_iq4580_EOImpl.getRequested
Accounts(UserManager_iq4580_EOImpl.java:46)
at com.boa.gcib.docwf.ecf.ejbs.user.UserManager_iq4580_EOImpl_WLSkel.invok
e(Unknown Source)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:477)
at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef
.java:108)
at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:420)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedS
ubject.java:353)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:14
4)
at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:
415)
at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.j
ava:30)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
Is there anything I am missing?
Please help me!
Thanks a lot in advance,
Mahesh
Message was edited by:
Maheshindia

There is a new flag named 'serialize-byte-array-to-oracle-blob' and it was
introduced in SP2. Check whether that flag is useful. More info can be found
on the SP2 release notes -
http://e-docs.bea.com/wls/docs81/notes/resolved_sp02.html
--Sathish
<Mahesh Patil> wrote in message news:[email protected]...
Hi all,
In one of our project we are using CMP 2.0 and WLS8.1 SP2. While storing
BLOB into Oracle (8.1.7) database we are not facing any issue.
But retrieving the BLOB from the database throwing error.
In weblogic.cmp.jar.xml I have defined the database column as below
<field-map>
<cmp-field>pendingUser</cmp-field>
<dbms-column>PENDING_USER</dbms-column>
<dbms-column-type>OracleBlob</dbms-column-type>
</field-map>
Stack trace of the issue is below
javax.ejb.FinderException: Exception executing finder
'findByAdministrator':
java.io.StreamCorruptedException: invalid stream header
java.io.StreamCorruptedException: invalid stream header
at
java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:737)
at java.io.ObjectInputStream.<init>(ObjectInputStream.java:253)
at
com.boa.gcib.docwf.ecf.ejbs.pendinguser.PendingUserEntity_2zvzps__WebLo
gic_CMP_RDBMS.__WL_set_pendingUserForInput(PendingUserEntity_2zvzps__WebLogic_CMP_
RDBMS.java:2258)
at
com.boa.gcib.docwf.ecf.ejbs.pendinguser.PendingUserEntity_2zvzps__WebLo
gic_CMP_RDBMS.__WL_loadGroup0FromRS(PendingUserEntity_2zvzps__WebLogic_CMP_RDBMS.j
ava:868)
at
com.boa.gcib.docwf.ecf.ejbs.pendinguser.PendingUserEntity_2zvzps__WebLo
gic_CMP_RDBMS.__WL_loadGroupByIndex(PendingUserEntity_2zvzps__WebLogic_CMP_RDBMS.j
ava:1100)
at
weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.loadBeanFromRS(RDBMSPe
rsistenceManager.java:428)
at
weblogic.ejb20.manager.DBManager.getBeanFromRS(DBManager.java:1435)
at
weblogic.ejb20.manager.BaseEntityManager.getBeanFromRS(BaseEntityManage
r.java:1207)
at
weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.getBeanFromRS(RDBMSPer
sistenceManager.java:2015)
at
com.boa.gcib.docwf.ecf.ejbs.pendinguser.PendingUserEntity_2zvzps__WebLo
gic_CMP_RDBMS.ejbFindByAdministrator(PendingUserEntity_2zvzps__WebLogic_CMP_RDBMS.
java:537)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.ja
va:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccesso
rImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at
weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.collectionFinder(RDBMS
PersistenceManager.java:378)
at
weblogic.ejb20.manager.BaseEntityManager.collectionFinder(BaseEntityMan
ager.java:1700)
at
weblogic.ejb20.manager.BaseEntityManager.collectionFinder(BaseEntityMan
ager.java:1672)
at
weblogic.ejb20.internal.EntityEJBHome.finder(EntityEJBHome.java:560)
at
com.boa.gcib.docwf.ecf.ejbs.pendinguser.PendingUserEntity_2zvzps_HomeIm
pl.findByAdministrator(PendingUserEntity_2zvzps_HomeImpl.java:128)
at
com.boa.gcib.docwf.ecf.ejbs.user.UserManagerBean.getRequestedAccounts(U
serManagerBean.java:1158)
at
com.boa.gcib.docwf.ecf.ejbs.user.UserManager_iq4580_EOImpl.getRequested
Accounts(UserManager_iq4580_EOImpl.java:46)
at
com.boa.gcib.docwf.ecf.ejbs.user.UserManager_iq4580_EOImpl_WLSkel.invok
e(Unknown Source)
at
weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:477)
at
weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef
.java:108)
at
weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:420)
at
weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedS
ubject.java:353)
at
weblogic.security.service.SecurityManager.runAs(SecurityManager.java:14
4)
at
weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:
415)
at
weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.j
ava:30)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
at
com.boa.gcib.docwf.ecf.ejbs.pendinguser.PendingUserEntity_2zvzps__WebLo
gic_CMP_RDBMS.ejbFindByAdministrator(PendingUserEntity_2zvzps__WebLogic_CMP_RDBMS.
java:556)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.ja
va:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccesso
rImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at
weblogic.ejb20.cmp.rdbms.RDBMSPersistenceManager.collectionFinder(RDBMS
PersistenceManager.java:378)
at
weblogic.ejb20.manager.BaseEntityManager.collectionFinder(BaseEntityMan
ager.java:1700)
at
weblogic.ejb20.manager.BaseEntityManager.collectionFinder(BaseEntityMan
ager.java:1672)
at
weblogic.ejb20.internal.EntityEJBHome.finder(EntityEJBHome.java:560)
at
com.boa.gcib.docwf.ecf.ejbs.pendinguser.PendingUserEntity_2zvzps_HomeIm
pl.findByAdministrator(PendingUserEntity_2zvzps_HomeImpl.java:128)
at
com.boa.gcib.docwf.ecf.ejbs.user.UserManagerBean.getRequestedAccounts(U
serManagerBean.java:1158)
at
com.boa.gcib.docwf.ecf.ejbs.user.UserManager_iq4580_EOImpl.getRequested
Accounts(UserManager_iq4580_EOImpl.java:46)
at
com.boa.gcib.docwf.ecf.ejbs.user.UserManager_iq4580_EOImpl_WLSkel.invok
e(Unknown Source)
at
weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:477)
at
weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef
.java:108)
at
weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:420)
at
weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedS
ubject.java:353)
at
weblogic.security.service.SecurityManager.runAs(SecurityManager.java:14
4)
at
weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:
415)
at
weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.j
ava:30)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
Is there anything I am missing?
Please help me!
Thanks a lot in advance,
Mahesh
Message was edited by:
Maheshindia

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1.)Can a rowtype or a table type returned from oracle database can be retrieved as a dataset or datareader?
2.)Cursors generally slow down your db(Iam from microsoft sql server back ground). But we seem to be using ref cursors quite a lot here.The only way to return a result as far as i have seen in oracle is to use a ref cursor.Is there any other way?

Hello,
1.)Can a rowtype or a table type returned from oracle database can be retrieved as a dataset or datareader?
I'm not sure how complex your "table types" are -- do you mean PL/SQL Associative Arrays (formerly knowns as "index-by" tables)?
I believe that %rowtype is a PL/SQL'ism that does not work outside of PL/SQL.
However, the 11g version of the provider introduced User Defined Types (UDTs) which may be helpful depending on your requirements, etc.
2.)Cursors generally slow down your db(Iam from microsoft sql server back ground). But we seem to be using ref cursors quite a lot here.The only way to return a result as far as i have seen in oracle is to use a ref cursor.Is there any other way?
Using a ref cursor is the way to return a result set from PL/SQL to a client. If you are not using PL/SQL then you would not use a ref cursor.
The .NET Developer Center has good information:
http://www.oracle.com/technology/tech/dotnet/index.html
Regards,
Mark

Can I retrieve a result set from Oracle and then incorporate that result set into my main SQL Server Stored Procedure?

So I have a chunk of data that only resides in Oracle. So I need to capture that information from Oracle. Now before you get over zealous, I did try with an OPENQUERY and it took FOREVER! And I don't know why the OPENQUERY took FOREVER but if I run the same
query directly against Oracle it runs very quickly...like 20 seconds.
So now I'm wondering...can I build a dataset in my SSRS Report that uses an Oracle Data source and an Oracle Stored Procedure in its Dataset that I'll create to aggregate this subset of data and then utilize its result set back in my main reporting
Dataset that will utilize SQL Server? And how can I do that? Can I make my main Dataset reference, say, a #TemporaryTable that is created from my Oracle Dataset in its
I'll continue to Google a few things as I await your review and hopefully a reply.
Thanks in advance for your help.

Hi ITBobbyP,
According to your description you want to use data from a Oracle data source into a DataSet which retrieving data from SQL Server. Right?
In Reporting Services, we can have multiple data sources in one project pointing to different database. And we can use separated dataset to retrieve data from different data source. However, it's not supported to combine the two datasets together
directly. We can only use Lookup(), LookupSet() function to combine fields from different dataset into one tablix when there are common columns between two datasets. This is the only way to make tow result sets together in SSRS.
Reference:
Lookup Function (Report Builder and SSRS)
LookupSet Function (Report Builder and SSRS)
Best Regards,
Simon Hou
TechNet Community Support

I cannot display image (read from oracle BLOB field) on browser?

I cannot display image (read from oracle BLOB field) on browser?
Following is my code, someone can give me an advise?
content.htm:
<html>
<h1>this is a test .</h1>
<hr>
<img src="showcontent.jsp">
</html>showcontent.jsp:
<%@ page import="com.stsc.util.*" %>
<%@ include file="/html/base.jsp" %>
<%
     STDataSet data = new STDataSet();
//get blob field from database
     String sql = "SELECT NR FROM ZWTAB WHERE BZH='liqf004' AND ZJH='001'";
     //get the result from database
     ResultSet rs = data.getResult(sql,dbBase);
     if (rs!=null && rs.next()) {
          Blob myBlob = rs.getBlob("NR");
          response.setContentType("image/jpeg");//
          byte[] ba = myBlob.getBytes(1, (int)myBlob.length());
          response.getOutputStream().write(ba);
          response.getOutputStream().flush();
     // close your result set, statement
     data.close();
%>

Don't use jsp for that, use servlet. because the jsp engine will send a blank lines to outPutStream corresponding to <%@ ...> tags and other contents included in your /html/base.jsp file before sending the image. The result will not be treated as a valid image by the browser.
To test this, type directly showcontent.jsp on your browser, and view it source.
regards

Image from Oracle BLOB is not showing

Hi all!
Im trying to use this code:
<?php
//... etc
$sql = oci_parse($c, 'select * from pf2.documents ');
oci_execute($sql);
echo "<table width = 200 border = 1 cellspacing=0 cellpadding=0>";
while ($row = oci_fetch_assoc($sql)) {
echo "<tr>";
echo"<td style=background-color:#DDDEEE; align=center>";
echo $row['SHORTNAME'] ;
echo"</td>";
echo"<td style=background-color:#DDDEEE; align=center>";
print $row['FILENAME'] ->load();
echo"</td>";
echo "</tr>";
echo "</table>";
//... etc
?>
Here im trying to select and publish an image from Oracle BLOB,
but in Mozilla Firefox im getting just whong text:
яШяа�JFIF��`�`��яЫ�C� $.' ",#(7),01444'9=82<.342яЫ�C 2!!22222222222222222222222222222222222222222222222222яА�МЂ"�яД�� яД�µ��}�!1AQa"q2Ѓ‘Ў#B±БRСр$3br‚ %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyzѓ„…†‡€‰Љ’“”•–—�™љўЈ¤Ґ¦§Ё©ЄІіґµ¶·ё№єВГДЕЖЗИЙКТУФХЦЧШЩЪбвгдежзийкстуфхцчшщъяД�� яД�µ��w�!1AQaq"2ЃB‘Ў±Б #3RрbrС $4б%с
Please help!
P.S.: Im using PHP 5.2.10 under Wintel platform,
Oracle 9.2.0.4,
create table DOCUMENTS
DOCID NUMBER(10) not null,
SHORTNAME VARCHAR2(30) not null,
FULLNAME VARCHAR2(250) not null,
FILENAME BLOB not null,
AUTHOR VARCHAR2(30) not null,
CREATIONDT DATE not null,
VERSION VARCHAR2(10) not null
Edited by: user502299 on 28.09.2009 5:33

I am having a similiar problem. I have created the image.php file:
<?
$query = "select a.image_file FROM officer_image a, officer_info b where a.officer_id=b.officer_id and b.officer_lname like 'LEDEZ%' ";
$stmt = @OCIParse ($db_conn, $query);
@OCIExecute($stmt, OCI_DEFAULT);
@OCIFetchInto($stmt, $arr, OCI_ASSOC+OCI_RETURN_LOBS);
$result = $arr['BLOB'];
@OCIFreeStatement($stmt);
@OCILogoff($conn);
$im = @imagecreatefromstring ($result);
if (!$im) {
$im = imagecreate(150, 30);
$bgc = imagecolorallocate($im, 255, 255, 255);
$tc = imagecolorallocate($im, 0, 0, 0);
imagefilledrectangle($im, 0, 0, 150, 30, $bgc);
imagestring($im, 1, 5, 5, "", $tc);
Header("Content-type: image/jpeg");
Header("Content-Disposition: attachment; filename=filename_".uniqid(time()).".jpg");
imagejpeg($im,'',100);
imagedestroy($im);
?>
And then in the actual search web page:
<?php
          $tname = $_POST['lname'];
          $lname = "{$tname}%";
          $id = "1";
          //$query = "SELECT officer_id, image_file FROM officer_image WHERE ID='.$id.'";
          $query = "select a.image_file FROM officer_image a, officer_info b where a.officer_id=b.officer_id and b.officer_lname like 'LEDEZ%' ";
          //oci_bind_by_name($sql, ":bv", $lname);
          //oci_execute($sql);
          $stid = OCIParse($conn,$query);
          Header("content-type:image/jpeg");
          OCIExecute($stid, OCI_DEFAULT);
          while($succ= OCIFetchInto($stid,$row)) {
               foreach($row as $item) {
     $blob_message = $item->load();
               // Output the image
          //imagejpeg($blob_message);
          echo $blob_message . " " ;
          //echo "<img src="image.php?id='.$blob_message.'" border="0">. $rows['officer_id']."\">\n";
          echo "<br /><br />";
               // Free up memory
          //imagedestroy($im);
          //while ($row = oci_fetch_assoc($sql))
?>
Can anyone help?

Error when reading BLOB field from Oracle usin Toplink

We experience a very annoying problem when trying to read a BLOB
field from Oracle 8.1.6.2.0 using TOPLink 3.6.3. I have attached the
exception stack trace that is reported to the console. As far as I can
judge a fault at oracle.sql.LobPlsqlUtil.plsql_length() happens first and
then at TOPLink.Private.DatabaseAccess.DatabasePlatform.convertObject().
The exception is permanently repeating that is very critical for us.
ServerSession(929808)--Connection(5625701)--SELECT LOBBODY, ID, LABEL, FK_OBJECT_ID, FK_OBJECTTYPE FROM NOTE WHERE (ID = 80020)
INTERNAL EXCEPTION STACK:
java.lang.NullPointerException
at oracle.sql.LobPlsqlUtil.plsql_length(LobPlsqlUtil.java:936)
at oracle.sql.LobPlsqlUtil.plsql_length(LobPlsqlUtil.java:102)
at oracle.jdbc.dbaccess.DBAccess.lobLength(DBAccess.java:709)
at oracle.sql.LobDBAccessImpl.length(LobDBAccessImpl.java:58)
at oracle.sql.BLOB.length(BLOB.java:71)
at TOPLink.Private.Helper.ConversionManager.convertObjectToByteArray(ConversionManager.java:309)
at TOPLink.Private.Helper.ConversionManager.convertObject(ConversionManager.java:166)
at TOPLink.Private.DatabaseAccess.DatabasePlatform.convertObject(DatabasePlatform.java:594)
at TOPLink.Public.Mappings.SerializedObjectMapping.getAttributeValue(SerializedObjectMapping.java:43)
at TOPLink.Public.Mappings.DirectToFieldMapping.valueFromRow(DirectToFieldMapping.java:490)
at TOPLink.Public.Mappings.DatabaseMapping.readFromRowIntoObject(DatabaseMapping.java:808)
at TOPLink.Private.Descriptors.ObjectBuilder.buildAttributesIntoObject(ObjectBuilder.java:173)
at TOPLink.Private.Descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:325)
at TOPLink.Private.Descriptors.ObjectBuilder.buildObjectsInto(ObjectBuilder.java:373)
at TOPLink.Public.QueryFramework.ReadAllQuery.execute(ReadAllQuery.java:366)
at TOPLink.Public.QueryFramework.DatabaseQuery.execute(DatabaseQuery.java:406)
I have started the application with Oracle JDBC logging on and found that the problem may originate in a possible lack of syncronization in the pooled connection implementation:
DRVR FUNC OracleConnection.isClosed() returned false
DRVR OPER OracleConnection.close()
DRVR FUNC OracleConnection.prepareCall(sql)
DRVR DBG1 SQL: "begin ? := dbms_lob.getLength (?); end;"
DRVR FUNC DBError.throwSqlException(errNum=73, obj=null)
DRVR FUNC DBError.findMessage(errNum=73, obj=null)
DRVR FUNC DBError.throwSqlException(reason="Logical handle no longer valid",
SQLState=null, vendorCode=17073)
DRVR OPER OracleConnection.close()
so the prepareCall() is issued against an already closed connection and the
call fails.
I assume we have been using a JDBC 2.0 compliant driver. We tried out
drivers that Oracle supplies for 8.1.6, 8.1.7 versions. To be true I
couldn't find any information about the JDBC specification they conform to. Does it
mean that these drivers may not be 100%-compatible with JDBC 2.0 Spec?
How can I find out if they are 2.0 compliant?
Also I have downloaded Oracle 9.2.0.1 JDBC drivers. This seemed to work
fine until we found another incompatibility which made us return back to
8.1.7 driver:
UnitOfWork(7818028)--Connection(4434104)--INSERT INTO STATUSHISTORY (CHANGEDATE, FK_SET_STATUS_ID) VALUES ({ts '2002-10-17 16:46:54.529'}, 2)
INTERNAL EXCEPTION STACK:
java.sql.SQLException: ORA-00904: invalid column name
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java:289)
at oracle.jdbc.ttc7.Oall7.receive(Oall7.java:573)
at oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1891)
at oracle.jdbc.ttc7.TTC7Protocol.parseExecuteFetch(TTC7Protocol.java:1093
at oracle.jdbc.driver.OracleStatement.executeNonQuery(OracleStatement.jav
a:2047)
at oracle.jdbc.driver.OracleStatement.doExecuteOther(OracleStatement.java
:1940)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatemen
t.java:2709)
at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePrepare
dStatement.java:589)
at TOPLink.Private.DatabaseAccess.DatabaseAccessor.executeDirectNoSelect(
DatabaseAccessor.java:906)
at TOPLink.Private.DatabaseAccess.DatabaseAccessor.executeNoSelect(Databa
seAccessor.java:960)
at TOPLink.Private.DatabaseAccess.DatabaseAccessor.executeCall(DatabaseAc
cessor.java:819)
at TOPLink.Public.PublicInterface.UnitOfWork.executeCall(UnitOfWork.java:

Hello Yury,
I believe the problem is that TopLink's ServerSession by default executes read queries concurrently on the same connection. It does this to reduce the number of required connections for the read connection pool. Normally this is a good concurrency optimization, however some JDBC drivers have issues when this is done. I had thought that with Oracle JDBC 8.1.7 this issue no longer occurred, but perhaps it is only after version 9. I believe that the errors were only with the thin JDBC driver, not the OCI, so using the OCI driver should also resolve the problem. Using RAW instead of BLOB would also work.
You can configure TopLink to resolve this problem through using exclusive read connection pooling.
Example:
serverSession.useExclusiveReadConnectionPool(int minNumerOfConnections, int maxNumerOfConnections);
This will ensure that TopLink does not to try to concurrently execute read queries on the same connection.
I'm not exactly sure what your second problem with the 9.x JDBC drivers is. From the SQL and stack trace it would seem that the driver does not like the JDBC timestamp syntax. You can have TopLink print timestamp in Oracle's native SQL format to resolve this problem.
Example:
serverSessoin.getLogin().useNativeSQL();
Make sure you configure your server session before you login, or if using the TopLink Session Manager perform the customizations through a SessionEventListener-preLogin event.

Retrieve data from oracle table, table name passed in runtime into JSP

Hello All,
I am new to JSP, i have a requirement,
I need to retrieve data from oracle table, here table is passed at random. how to get the data displayed in JSP page.
can any one help me in that
thanks

1) Learn SQL.
2) Learn Java.
3) Learn JDBC.
4) Learn DAO.
5) Learn HTTP.
6) Learn HTML.
7) Learn JSP/Servlet.
8) Learn JSTL.
9) Apply learned things and develop.
Whenever you stucks, please come back and post the specific coding/technical problem here.

Retrieving BLOB in CMP2.0 from Oracle 8.1.7.3

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