How to use a Java Thread in a Java Stored Procedure?

I am working with java stored Procedures but i have a problem when i use threads.While the thread is running all the processes are blocked because the thread is not detatched.I don't know if it is impossible to use Thread in a java stored procedure.i made many researches but didn't find information about this case of Thread.If someone knows what to do in this case it will be helpfull for me.Thanks

The JAR is already load by using CREATE JAVA RESOURCE ... or "loadjava -resolve –force -user p/p@SID –genmissing -jarasresource MyJar.jar"
If we can create a resource by SQL or loadjava, how can I use it in my java code?
Edited by: 847873 on 28 mars 2011 06:05
Edited by: 847873 on 28 mars 2011 06:07

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Help with use of Java Stored Procedures to invoke Java Code within Applicat

Good afternoon everyone
Our development team is looking for some assistance/validation of a design strategy we are deploying for a client. Let me first layout the environment and then the design issue at hand:
Business User Workstation component: Oracle SQL*Developer 1.5.x
Reporting Tool: Actuate e.Spreadsheet A10
Application Web UI: J2EE application developed with Eclipse
Application Scripting: Application has a scripting component whereby business users can write Oracle PL/SQL to perform many of the functions that are available in the Web UI, but can be batched up or repeated several times.
Application Server WebLogic 9.2.3 (client constraint)
Database Serve: Oracle 11g, Release 11.1.0.7
Lots of other stuff included but irrelevant for this conversation.
Here's the scenario in question:
1.     Through the scripting solution, the application user must use PL/SQL to invoke functionality within the Web UI. All PL/SQL that the application user creates does not contain any SQL. Instead our security model mandates that “pre-defined” routines will perform all of the SQL operations against the database; the application user simply invokes the stored procedures of functions to perform activities in the database.
2.     There is a component of the scripting application that facilitates the creation of reports. In our application, we are using Actuate’s e.Spreadsheet Engine to create the report and format the report based on a template. The template is provided as input, as well as other data items, into Actuate for processing. The net result is the report is created by the Actuate e.Spreadsheet engine in pdf format and then sent back to the user for distribution to other users in the company.
3.     The Actuate e.Spreadsheet engine consists of one or more JAR files within the Application Server framework. The Web UI utilizes these JAR files as well to perform report generation and data manipulation activities. In the case of the reporting functionality, the pdf report that is generated by Actuate is returned into either the Web UI or into the scripting component for persistence in the database. The mechanism exists to create multi-step jobs that can create multiple reports in one run.
4.     So to facilitate the above, we are creating one or more Java Stored Procedures that will mediate the communication between the PL/SQL the user’s create and the Java components that are required for business processing. PL/SQL will invoke one or more Java Stored Procedures. Then the Java Stored Procedures invoke Actuate e.Spreadsheet, generate the report, saves the report in the database and returns control back to the invoking procedure.
So the question is: Is this a viable and correct use of Oracle Java Stored Procedures. What are the advantages/disadvantages of doing so? Any security issues or potholes that you can think of? Tuning issues for the JVMs? Any white papers that you can think of?
For any Oracle employees that respond, material such as Oracle Whitepapers, etc. would be great.
I can be contacted at (313) 227-4350 or at [email protected]
Thanks in advance.

So are you planning on loading the entire e.Spreadsheet engine into the database server's JVM?
If so, I would expect that to work, but I expect that you'd have some performance issues. I'd expect that the process of building these PDFs is going to be relatively expensive. Tuning the database server's JVM tends to be rather more challenging than tuning JVM's in an app server.
If not, I'm not sure how the Java stored procedure would invoke the e.Spreadsheet engine on the application server. It is possible to use Oracle AQ to send a JMS message, but I don't think you can use the standard J2EE JMS APIs-- I think you'd have to use Oracle's AQ interface.
Justin

ORA-29532 when trying to write to a file using a Java stored procedure

I have a Java stored procedure which gives me the following error when I run it:-
SQL> exec zipfile('c:\temp\test.txt');
BEGIN zipfile('c:\temp\test.txt'); END;
ERROR at line 1:
ORA-29532: Java call terminated by uncaught Java exception:
java.security.AccessControlException: the Permission (java.io.FilePermission
c:\temp\test.txt.zip write) has not been granted to SCOTT. The PL/SQL to grant
this is dbms_java.grant_permission( 'SCOTT', 'SYS:java.io.FilePermission',
'c:\temp\test.txt.zip', 'write' )
ORA-06512: at "SCOTT.ZIPFILE", line 1
ORA-06512: at line 1
I have tried running the dbms_java command as recommended as sys and have performed the necessary commit afterwards, also I have ran dbms_java.grant_permission( 'SCOTT', 'java.io.FilePermission',
'*', 'write' )
But I still get the ORA-29532.
Does anyone have any ideas as to how I can get around this ?

Are you getting ORA-29532 for the same file and the same permission ?
Edited by: user769997 on Nov 23, 2009 12:57 AM

How to create a java stored procedure

hi @all
i have no expierence with java
my plan
i want to select (create view) data from a table which is located in sql server db
with a java stored procedure.
i won't use the way Generic Connectivity/Transparent Gateways (http://download-west.oracle.com/docs/cd/A87860_01/doc/server.817/a76960/hs_admin.htm).
can anybody help me?

Download JDeveloper. Look for examples on http://otn.oracle.com.

How to implement simple java stored procedure

I'm using Maxdb 7. 6.03.15 (standalone - no SAP) as a Migration Environment to a new centralized SAP solution.
Most of the work is done in internal DBproc but I need to trig external procedure (those one's written in Java).
I have already spent too much time to find related information and because I need only very simple triggreing, I don't want to learn and deploy product like NetWeaver ... anyone could give me minimal information on how to do that ...
If I'm right, I need to configure the MessageServer and develop a minimist java proc that should be able to register the DBproc (java language) inside DB and handle the MessageServer msg generated by my internal DBproc call to the newly registered java proc ?
I just want to do that as simple as possible, I don't need locking scheme neither multiple request queue ... because I control all access to the DB and all process are completely serialized (It was a design rule).
Could anyone help me ?

Thank's Lars for that quick answer !
You wrote,
> AFAIK one development target is to implement UDEs (User Defined Extensions) that will allow the creation of "inside-the-db-code" in >other languages than the one used for the stored procedures.
did you mean "JavaUdeServer" ? I see some interesting code in source tree about that . I investigate a little about but I miss the binary javaUdeServer code (and I don't want to rebuild the distribution also because of different version). The message returned when I tried to call a registered java stored proc was smoething like 'Impossible to contact UDE server'
But the code is still embedded in the kernel (as It can be found in the map files).
I don't find any documentation on that feature ,is it for security reason ? If so I'm ready for a 'No disclosure agreement' (It's not a personal request).
Of course, if the only way is NetWeaver that could be OK but the task seem's to me so heavy regarding my so simple need's ... if there is a short way (samples ?) to kick me on NetWeaver to reach my goal you're welcome !!
(Some piece of code on NetWeaver that allow a procedure to call to external java proc that return hostname will be enough ...).
For you information, (because I have the feeling I got your answer) I already install a trial NetWeaver some week's ago but I don't spent (and I don't have) many times to use It and I have the bad sensation to try driving a big truck only to move a cup of coffee ...(of Java of course !) but perhaps I'm too impatient ?
Regards,
Michel

Java- Stored Procedure with Call by Result

Hi Oracle-Community,
I am looking for some example Code how to use a Java-Stored Procedure with Out-Parameters. Don't get me wrong. I dont want to call a Procedure with Out Parameters from Java (there are a lot of examples for this out there) . I just want to implement the Call by Result concept in a Java-Stored Procedure. A Client will call this Procedure with some parameters and the Java Procedure will fill them. So my first question: is this possible? And my second Question: How to implement it?
Greetings.

I found out a solution. It is very simple.
Just defining the parameters as java array (e.g. String[] P1). The first value (P1[0]) is the returned value.
At last just set in JDeveloper in the "Edit Method Signature" Dialog the parametermode to OUT.
The dialog can be found by rightclicking on the stored procedure in the dbexport file. You can read this
in Section 6 Publishing Java Classes With Call Specifications -> Setting Parameter Modes in
Oracle Database Java Developer's Guide.

Returning a serializable object from a java stored procedure

[Server : Oracle 8.1.6 on WinNT4 server. Client : java 1.2.2 on WinNT4 workstation.]
I am attempting to use a java stored procedure to build a complex serializable java object on the database (to minimise number of requests/queries on the network) and then return this object in response to the original query.
I have it writing a BLOB by means of
OutputStream os = retval.getBinaryOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(os);
oos.writeObject(v);
return retval;
where retval is a blob selected from a dummy table (created for this purpose) and v is a vector containing only serializable objects.
However, on the client side when I attempt to recover the object by
OracleResultSet rs = (OracleResultSet)stmt.executeQuery("SELECT javatest FROM DUAL");
oracle.sql.BLOB blob=rs.getBLOB(1);
InputStream inp = blob.getBinaryStream();
ObjectInputStream oinp = new ObjectInputStream(inp);
Vector retval = (Vector)oinp.readObject();
I get an exception telling me that the input stream does not contain an object at the line containing new ObjectInputStream(inp);
The full exception is :
java.io.StreamCorruptedException: InputStream does not contain a serialized object
at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:731)
at java.io.ObjectInputStream.<init>(ObjectInputStream.java:165)
at eRespond.DBLayer.JavaStoredProcedures.testdbobj.test2(testdbobj.java:143)
at eRespond.DBLayer.JavaStoredProcedures.testdbobj.main(testdbobj.java, Compiled Code)
I've checked that the returned blob is non-null, and that oracle.sql.BLOB is used throughout.
Any thoughts?
Thanks,
mark.

Firstly I guess to be able to new B() as a Thread, B
should extends Thread.
Secondly the constructor should not have any return
type:
public B(String cmd)
instead of
public void B(String cmd)
Lastly there is no need to override the start() method
if all it does is to call the superclass. The subclass
automatically inherits the method.
Hope this helps.thanks for replying so soon...
yes, you are right, it should extends Thread and it is, i forgot to out in this example... my mistake!
i'll try the construnctor thing to see if it works. bare in mind that i working with java stored procedures, it should work even so, right?
thanks

Running a Corba Client as a Java Stored Procedure

Hi,
I�m trying to use a Java Stored Procedure running as a Corba Client. I want to use the built in Visibroker ORB on Oracle side and JacORB (or others) on the server side.
How can I init the ORB and get a naming service running not in Oracle but on the server side? Also which jar�s do I need to load into the db with (loadjava) to run the visibroker orb inside the Java Stored Procedure Client?
I�m using Oracle 8.1.7.
Thanks for help ;)

By the way I�m using ORACLE 8.1.7.

Forcing a commit in a JAVA stored procedure

Hi,
I am using a java stored procedure which updates few tables ;only after it completes the call the commit is happening;But i wanted it to commit the tables as and when the processing happens not at the end of the call to java stored procedure because the GUI is polling for changes into the database which will be updated by the stored procedure.
i have already set the connection.setAutoCommit(true) in the code.
Can somebody suggest a solution ?
Thanks in advance
varun

Jason,
Works for me on Oracle 10.1.0.3 running on Red Hat Enterprise Linux AS release 3 (Taroon).
Java code:
import java.sql.*;
* Oracle Java Virtual Machine (OJVM) test class.
public class OjvmTest {
public static void test() throws SQLException {
    Connection conn = DriverManager.getConnection("jdbc:default:connection:");
    PreparedStatement ps = null;
    ResultSet rs = null;
    try {
      ps = conn.prepareStatement("select 'TEST' from SYS.DUAL");
      rs = ps.executeQuery();
      if (rs.next()) {
        System.out.println(rs.getString(1));
    finally {
      if (rs != null) {
        try {
          rs.close();
        catch (SQLException sqlEx) {
          System.err.println("Error ignored. Failed to close result set.");
      if (ps != null) {
        try {
          ps.close();
        catch (SQLException sqlEx) {
          System.err.println("Error ignored. Failed to close statement.");
}And my PL/SQL wrapper:
create or replace procedure P_J_TEST as language java
name 'OjvmTest.test()';And here is how I execute it in a SQL*Plus session:
set serveroutput on
exec dbms_java.set_output(2000)
exec p_j_testGood Luck,
Avi.

Java stored procedure in Oracle 8i

Hi,
I read in the whitepaper of Oracle "Stored Procedure Tutorial", I have a little problem understanding the following syntax in the example enclosed, please help.
In Java environment the method:
public static void assignEMailAddress(Connection conn, int eno, String fname, String lname) throws Exception;
this method take 4 parameters, but when it is public to SQL, the parameter is ignored!
Is this understood by the DBMS?
Is this Connection-typed parameter must ALWAYS be the first one in the proceudre list or the procedure list can be in any order?
The tutorial is given in Oracle 8i, Lite, we will be using the real Entreprise Oracle 8i, does it make any difference in how we should load java stored procedure?
I really appreciate any help. thanks
null

Mapping between Java types and pl/sql types
can only be done for standard Java datatypes.
You cannot publish a java procedure accepting a Connection variable to PLSQL.
Hope this helps.

Java Stored Procedure in EXECUTE IMMEDIATE

Hi,
I need advice for the following.
I'm on Oracle 11g R2. I'm testing application in Oracle 11gR1 and R2 and Oracle Express.
Purpose is to generate XML reports.
I have PLSQL Stored Procedure which does that, but since there is bug in Oracle11gR2 related to XMLTRANSFORM I have and Java Stored Procedure which is workaround. They are both compiled, valid etc.
Java class is :
import java.io.PrintWriter;
import java.io.Writer;
import oracle.xml.parser.v2.DOMParser;
import oracle.xml.parser.v2.XMLDocument;
import oracle.xml.parser.v2.XSLProcessor;
import oracle.xml.parser.v2.XSLStylesheet;
* This class is used as Java stored procedure
* There is a bug on Oracle11gR2, related to the limitation on the number of style sheet instructions
* This stored procedure is workaround when PLSQL code can not be used.
* File must not have package, otherwise is wrongly compiled in DB
public class JavaXslt {
     public static void XMLTtransform(oracle.sql.CLOB xmlInput,oracle.sql.CLOB xslInput,oracle.sql.CLOB output) throws Exception{
          DOMParser parser;
          XMLDocument xml;
          XMLDocument xsldoc;
          try{
               parser = new DOMParser();
               parser.parse(xmlInput.getCharacterStream());
               xml = parser.getDocument();
               parser.parse(xslInput.getCharacterStream());
               xsldoc = parser.getDocument();
               XSLProcessor processor = new XSLProcessor();
               XSLStylesheet xsl = processor.newXSLStylesheet(xsldoc);
               Writer w = output.setCharacterStream(1L);
               PrintWriter pw = new PrintWriter(w);
               processor.processXSL(xsl, xml, pw);
          }catch (Exception ex){
               throw ex;
PROCEDURE Java_XmlTransform (xml CLOB, xslt CLOB, output CLOB) AS LANGUAGE JAVA
NAME 'JavaXslt.XMLTtransform(oracle.sql.CLOB, oracle.sql.CLOB, oracle.sql.CLOB)';
I'm calling Java stored procedure from PLSQL Stored procedure (if it is Oracle11gR2) like that :
Java_Proc.Java_XmlTransform(inputXML, xslt, res);
So till here everything works ok. XSLT as applied and output XML (res) is OK.
But when Oracle Express is used Java is out of the question, so there is no Java stored procedure. Howewer PLSQL Stored procedure is still needed.
So I had to put call to Java Stored procedure in EXECUTE IMMEDIATE statement in order to compile to PLSQL package.
But when I do that :
EXECUTE IMMEDIATE 'BEGIN Java_Proc.Java_XmlTransform (:1, :2, :3); END;' USING inputXML, xslt, res;
result value CLOB (res) has zero length...
What am I missing? Should i set return value to Java class?
Hope my explanations are clear though.
Thanks

Hi odie_63,
Thanks for quick response.
I didn't clearly explained.
When using Oracle 11gR1 and Oracle Express I'm using only PLSQL Procedure.
When using Oracle 11gR2 i have to use Java Stored procedure because there is documented bug in R2.
That's why i have to use EXECUTE IMMEDIATE. I don't know which version is the client DB and whether there is or no Java procedures.
I did tried
EXECUTE IMMEDIATE 'BEGIN Java_Proc.Java_XmlTransform (:1, :2, :3); END;' USING IN inputXML, IN xslt, OUT res; and the result was ORA-06537: OUT bind variable bound to an IN position
When using IN OUT for last parameter i.e.
EXECUTE IMMEDIATE 'BEGIN Java_Proc.Java_XmlTransform (:1, :2, :3); END;' USING IN inputXML, IN xslt, IN OUT res;
there is no exception, but still DBMS_LOB.getlength(res) = 0
Thanks

Java stored procedures performance ....

I am currently evaluating the use of Java stored procedures, but
have so far found the performance to be incredibly poor. If I
write a simple piece of SQL to insert 1 row to a 2 column table
via a standalone JDBC application, the average elapsed time over
5 runs is approx 24 milliseconds. If I move the same piece of
code to a Java stored procedure, the elapsed time increases (on
average) to 28 seconds ! Surely this shouldn't be the case; I
had expected the performance to increase rather than plummet as
is the case. The DBA team cannot find anything amiss in the
database, & we are basically scratching our heads as to what the
problem is. Is there something fundamental that needs to be done
the database for a Java implementation ??
ANY IDEAS ANYONE ???????
nb: database ver 8.1.5, running on Solaris 5.7
regards,
Paul.
null

Try running long queries. In 8.1.6, we are concentrating more
on increasing the performance of JDBC driver inside the server.
Paul Jones (guest) wrote:
: I am currently evaluating the use of Java stored procedures,
but
: have so far found the performance to be incredibly poor. If I
: write a simple piece of SQL to insert 1 row to a 2 column table
: via a standalone JDBC application, the average elapsed time
over
: 5 runs is approx 24 milliseconds. If I move the same piece of
: code to a Java stored procedure, the elapsed time increases (on
: average) to 28 seconds ! Surely this shouldn't be the case; I
: had expected the performance to increase rather than plummet as
: is the case. The DBA team cannot find anything amiss in the
: database, & we are basically scratching our heads as to what
the
: problem is. Is there something fundamental that needs to be
done
: the database for a Java implementation ??
: ANY IDEAS ANYONE ???????
: nb: database ver 8.1.5, running on Solaris 5.7
: regards,
: Paul.
Oracle Technology Network
http://technet.oracle.com
null

Java Print Service API in Java Stored Procedure (Linux)

Hi
We are running an Oracle 10g database on Linux and I am in the proces of developing a java stored procedure which should utilize the Java Print Service API.
I have made a simple stored procedure to list all available printers and the DocFlavors they support (se the code below).
My problem is that no printers are listed. I have made a standalone java app. with the same code and executed it directly on the OS level of the Linux box through the Sun JDK 1.4.2 and here I get two printers.
Is there any specific configuration I need to do to make it work?
I am wondering if I need to grant specific authorisations through dbms_java for it to work...?
Any help is greatlyh appreciated.
************************************** CODE BEGIN *************************************
import javax.print.DocFlavor;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
public class TestPrintService {
public TestPrintService() {
public static void listPrinters() {
// Get all available printers and their supported DocFlavors
PrintService[] pservices =
PrintServiceLookup.lookupPrintServices(null, null);
System.out.println("Printer services: " + pservices.length);
for (int i = 0; i < pservices.length; i++) {
PrintService pservice = pservices;
System.err.println("Printer: " + pservice);
DocFlavor[] docFlavors = pservice.getSupportedDocFlavors();
for (int j = 0; j < docFlavors.length; j++) {
DocFlavor docFlavor = docFlavors[j];
System.err.println("DocFlavor " + docFlavor.toString());
System.err.println();
************************************** CODE END *************************************
Cheers,
Jacob Vennervald

Found this on Oracle support:
Cannot List Available Printers From The Database Using A Java Stored Procedure [ID 372694.1]
Applies to:
Oracle Server - Enterprise Edition - Version: 10.1.0.4.0
This problem can occur on any platform.
Symptoms
Able to list available printers on a machine when running Java code outside the Database.
When running the same Java code inside the Database as a Java Stored Procedure, no printers are found.
Cause
Due to security restrictions, this is expected results.
The Java Docs state:
"Services which are registered by registerService(PrintService) will not be included in lookup
results if a security manager is installed and its CheckPrintJobAccess() method denies access."
Also from the documentation it states:
"A PrintServiceLookup implementor is recommended to check for the SecurityManager.checkPrintJobAccess() to deny access to untrusted code. Following this recommended policy means that untrusted code may not be able to locate any print services. Downloaded applets are the most common example of untrusted code."
Using the checkPrintJobAccess(); call, it does produce a Security Exception when run inside the Database but not when run outside. The exception can be viewed within the log file found in the UDUMP directory.
Solution
Run the following code to confirm obtaining available __printers can not be done...__
This is the code to create the Java Stored Procedure
CREATE OR REPLACE AND RESOLVE JAVA SOURCE NAMED "ListPrinters" AS
import javax.print.*;
public class ListPrinters {
public static String AvailablePrinters(){
String strList;
PrintService[] pservices =PrintServiceLookup.lookupPrintServices(null,null);
if (pservices.length > 0 )
strList = pservices[0].getName();
else
strList = "No printers found";
return strList;
public static String listprinters() throws Exception {
String listofprinters;
try {
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkPrintJobAccess();
catch (SecurityException ex) {
System.err.println("Sorry. Printing is not allowed.");
listofprinters = AvailablePrinters();
return listofprinters;
This is the PL/SQL Wrapper
CREATE OR REPLACE FUNCTION Get_Printer_Test RETURN VARCHAR2 IS
LANGUAGE JAVA
NAME 'ListPrinters.listprinters() return String';
This executes the code
SQL> SELECT Get_Printer_Test FROM DUAL;
GET_PRINTER_TEST
No printers found
This is the output found in the trace file in the UDUMP directory
*** SESSION ID:(144.28) 2006-07-08 09:02:25.518
Sorry. Printing is not allowed.

Weblogic 6.1 & Oracle Java Stored Procedures

Hi all
I need to access a EJB deployed into Weblogic 6.1 (It's a mail sender EJB) when an event occurs in a Oracle 8.1.7 DataBase (when a table were updated).
I think the only way to do it is firing a trigger, this trigger uses a Java Stored Procedure that connects with the EJB via JNDI.
And here comes the problem:
must I load the weblogic.jar (25M) into the DataBase through loadjava??
There is no a way to include jars in the Oracle classpath??
Please help
Thanks in advance.
David.

Hi,
I want to ask you one thing:
Once the procedure is called is it not executing at the database?The Oracle process handling it(Procedure).So wont that be able to call the trigger as it works in the (Oracle)environment.
So where does the importing of the java classes(Object) is related to
the Trigger invocation....
vicky

How to Use the JAVA SCRIPT code in .htm page of the component

Hi .
In my requirement i have to use Java Script Function in .htm code ..how to use the java script code and functions in .htm???
thank you
B.Mani

Check this document [Arun's Blog|http://wiki.sdn.sap.com/wiki/display/CRM/CRMWebClientUI-TalkingwithJava+Script]
Regards
Kavindra

How to use a Java Thread in a Java Stored Procedure?

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