URGENT - Call java from pl/sql

Hi,
How Can I call external java class in a pl/Sql ??
Regards
Giordano

Hi
a way to do that, is to load the external java class in your database, like that (ORACLE_SID is setting):
loadjava -user myuser/mypassword /mypathname/myPackage.class
Then, you must declare this external procedure like that,
(for example)
CREATE OR REPLACE PROCEDURE p_jMyProcedure (Param in varchar2) AS LANGUAGE JAVA NAME 'myPackage.myProcedure(java.lang.String)';
you can call your procedure as a pl/sql procedure
so long;

Similar Messages

Advantages and Disadvantages of calling java from PL/SQL

Hi,
I have one doubt. What are all the advantages and disadvantages of the calling java from PL/SQL?
In actual scenario the java program will be in the Application server side. It will do the operation and it will store the result in Data base. But in this case (calling java from PL/SQL), we are loading the java program in the Data base and it is doing the operations.
I have seen many posts are coming regarding loading jar files into the database. Actually the jar will deploy in to Application server. Is there any difference instead of keeping in the Application server side?
Then I have read,
advantages:
-> java having lot API's. so PL/SQL can use that API's.
-> if we can not do anything in PL/SQL. we can do it using this mtd(calling java from PL/SQL).
My questions:
-> could you explain what are all the things we can not do but we can do using "calling java from PL/SQL" method?
-> is there any other advantages?
Disadvantages:
-> the performance is very slow in calling java from PL/SQL.
My questions:
-> Then why others are loading java files and jar files into database?
-> is there any other disadvantages?
Could you explain about this one? It will be more helpful to others also…
Regards,
kk

Hi,
You can read the free first chapter of my book @ http://www.amazon.com/gp/product/1555583296/ (see details then Excerpt)
Kuassi http://db360.blogspot.com

Advantages of calling java from PL/SQL

Hi experts,
Could any one tell me the advantages of calling java program from PL/SQL?
Regards,
karthi

Hi,
You can read the free first chapter of my book @ http://www.amazon.com/gp/product/1555583296/ (see details then Excerpt)
Kuassi http://db360.blogspot.com

Calling java from pl/sql in oracle 10g?its very urgent.

Hi Friends,
i hve simple java code:
class Hell
public static String Hello()
return"hello world";
& compile this code using javac & loaded Hell.class in to database using this command
c:\>loadjava -user chandru/shekar@pulser c:\Hell.class
& i wrote pl/sql like:
CREATE OR REPLACE FUNCTION Hell RETURN String as language java name 'Hell.Hello() return java.lang.String';
i will compile the code & run but at that time this error i am getting:
ORA-29516: Aurora assertion failure: Assertion failure at eox.c:317
Uncaught exception System error: java/lang/UnsupportedClassVersionError
I am using oracle 10g.Plzzzzzzzzz help me.Its very important to for me.
Is any path i hve to set for oracle 10g database.Plz any one help me.
regards
shekar

Hello here is how I solved the problem
Let us assume that i try to load the file Hello.Java into the user scott.
public class Hello {
     public static String world() {
          return "hello world";
1) Dropjava
You must drop the java class if you already have loaded the class onto the server.
dropjava -u scott/tiger Hello.class
2) load class on server and let the server compile the source code.
It is necessary to compile the source code on the server when the server and the local machine have different Java versions. To check which Java version there is running on the client machine open a command prompt and write Java -version
loadjava -user scott/tiger -resolve Hello.java
3) Publish stored procedure
sqlplus scott/tiger@oracle
CREATE OR REPLACE FUNCTION helloworld RETURN VARCHAR2 AS                LANGUAGE JAVA NAME 'Hello.world () return java.lang.String';
4)Call stored procedure
VARIABLE myString VARCHAR2(20);
CALL helloworld() INTO :myString;
PRINT myString;
RGDS
Thomas Winterberg

Calling JAVA from PL/SQL

Hello,
Are there any PL/SQL code examples on how to call a JAVA program from a when-button-pressed trigger event?
Thanks much.

Hi,
I was able to import the JAVA code via the "Import Java Classes". Now, what PL/SQL statements do I put in my "when-button-pressed" trigger to execute this JAVA code? Any samples around, preferably with examples of parameter passing.
Thanks in advance!!

Calling Java from PL/SQL truncates long

We are using Oracle 8.1.6 on Sun.
We have a table with a field defined as type Long.
When a record is inserted into the table, a trigger fires a java stored procedure.
The stored proc takes the provided long and attempts to pass it to a RMI call.
The long is passed as a java.lang.string.
However, the class that is invoked through RMI received a NULL value.
null

Is the same problem happening for a small String value also?
i.e stroing the a short value in the long column also causing the same problem.
Will it be possible to give us some kind of test case (code) or you can give us the exact steps to reproduce the problem.
null

Call php from PL/SQL

Hello !
i want to call PHP from PL/SQL(procedure).
Is it possible .
If yes then how.
if no then is there any other way to do it.
Regards
null

<BLOCKQUOTE><font size="1" face="Verdana, Arial, Helvetica">quote:</font><HR>Originally posted by Michael Kleiser ([email protected]):
Look at this: http://www.oracle.com/oramag/code/tips2001/index.html?021201.html
It`s a java-function which calls a os-command.
I haven4t testet it.
In this forum http://www.dbasupport.com/forums/showthread.php?threadid=3703
someone asked the same question as you.
I hope this helps you.<HR></BLOCKQUOTE>
I've tried the tip above without success. Has anyone got it to work?
null

Call java from ABAP

JCo connectivity is used to call RFCs from Java. can i call Java from abap?
thanks in advance.....
regards,
Sundararamaprasad

Hi Sundar ,
This link will surely give u an idea about calling java fro ABAP using Jco.
http://www.thespot4sap.com/Articles/SAP_Netweaver_Java_Connector.asp
regards,
aravindh.

Calling Java from Delphi

Can ActiveX bridge used for calling Java from Delphi?

Also trying to solve this problem, after creating the bean i packaged/registered it successfully, (tested the bean using beanbox, works perfectly) then tried calling it via createoleobject in delphi 7
(*Code Snip *)
Var
v : variant;
begin
try
v := createoleobject(Edit1.text); // my class name ie WorldPort.Bean (also tried WorldPort.Bean.1
except on e:exception do
showmessage(e.Message)
end;
end;
(*Code Snip*)
After this simple code failed i started backtracking , eventually after getting "Access Violation...etc in axbridge.dll" all the time. tried delphi "import activex control" got the same access violation.
Decided to test the example from http://java.sun.com/j2se/1.4.2/docs/guide/beans/axbridge/developerguide/examples.html........ they both crashed on execution (calc.exe and boundprop.exe).
After this failed I tested these example classes on another machine, both crashed again.....
Also tried this experiment in VC++ , after adding the class to the Toolbox , i try to drop it onto a form, once again access violation.**PS**
('You will need VC++ and the Microsoft SDK to build the dll, download c++beta for free from microsoft site it you need it')** and a simple cmd file todo the job would look something like this:
echo - ** Build Java ActiveX Bridge **
echo Make sure these folders exist in jre--> axbridge\lib and axbridge\bin
cd\SDK\jre\axbridge\bin
set path=%path%;C:\MSDN\Bin;C:\VisualC++\lib
echo path
javac WorldPort.java
jar cmf Manifest.txt WorldPort.jar WorldPort.class
"C:\SDK\bin\packager.exe" -clsid {162193C4-AD5C-4A06-9F88-A737AE9B43AD} -out "C:\SDK\jre\axbridge\bin" WorldPort.jar WorldPort-reg
*** After running this cmd you will find the dll in bin folder and the jar in lib folder..***
Must Read:http://java.sun.com/j2se/1.4.2/docs/guide/beans/axbridge/developerguide/index.html
Hope some of this helps , if you have successfully created / installed/ used a "JavaActiveX" in Delphi , i would really like to try replicate it on my machine..

Call java from sybase trigger

Is it possible to call java from Sybase trigger ? If so can you please supply example or URL to one ? Alternative solution is to call shell script from sybase trigger (as app is based on Solaris).
Regards
Michal

Thank for your opinion, but what idea is better ?Doing things in the middle tier, where Java lives.
Ever heard of event-based trading systems?
pooling a table every 30 sec. ?. I need to implment
real-time system which process each trade from table
once it appears there.Sounds like you have it backwards - you're trying to drive Java from the database.
I think it'd be better to write that event-based system in Java and leave the database just for persistence.
GigaSpaces and their ilk are being used this way for highly transactional trading systems. Maybe you could see how they're doing it.
%

Problem calling java from vb via activex bridge

I am trying to call java from vb via ActiveX Bridge and I am running into problems. I would appreciate any help.
I am using Visual Basic 2010 express, and Java JDK 1.6.0_16. I have used the http://download.oracle.com/javase/1.4.2/docs/guide/beans/axbridge/developerguide/index.html page as a guideline. To try to make it work I took the following steps:
1. Wrote a very simple java class (below):
package xxx;
import java.io.Serializable;
public class axb implements Serializable {
public int get_axb_Handle() {
int Address = 12345678;
return Address;
2. After I compiled, and created the jar file. I built the dll using the following command:
"C:\Program Files\Java\jdk1.6.0_16\bin\packager" -out "C:\Program Files\Java\jdk1.6.0_16\jre\axbridge\bin" E:\axb\dist\axb.jar xxx.axb
3. I then registered using: regsvr32 axb.dll
4. In Visual Basic Express IDE I use Project -> Add Reference to add Iterop.axb (dump below), and axb namespace
5. In my basic code I use the following lines
Dim axb1 As axb.axb
axb1 = New axb.axb <== Crash here with AccessViolationException ( full exception below)
What am I missing? Any help would be greatly appreciated
Thanks
Iterop.axb partial dump
___[MOD] C:\Documents and Settings\Elie A. Cohen.USINC022\My Documents\Visual Studio 2010\Projects\Repo API Example\Repo API Example\obj\x86\Release\Interop.axb.dll
| M A N I F E S T
|___[NSP] axb
| |___[INT] axb.axb
| | | .class interface public abstract auto ansi import /*02000006*/
| | | implements axb.axbDispatch/*02000003*/
| | | implements axb.axbSource_Event/*02000005*/
| | | .custom /*0C000018:0A000001*/ instance void [mscorlib/*23000001*/]System.Runtime.InteropServices.GuidAttribute/*01000002*/::.ctor(string) /* 0A000001 */ = ( 01 00 24 34 45 36 44 30 44 41 38 2D 36 41 45 44 // ..$4E6D0DA8-6AED ...
| | | .custom /*0C000019:0A000007*/ instance void [mscorlib/*23000001*/]System.Runtime.InteropServices.CoClassAttribute/*01000009*/::.ctor(class [mscorlib/*23000001*/]System.Type/*01000007*/) /* 0A000007 */ = ( 01 00 0C 61 78 62 2E 61 78 62 43 6C 61 73 73 00 // ...axb.axbClass. ...
| |
| |___[CLS] axb.axbClass
| | | .class public auto ansi import /*02000004*/
| | | implements axb.axbDispatch/*02000003*/
| | | implements axb.axb/*02000006*/
| | | implements axb.axbSource_Event/*02000005*/
| | | .custom /*0C00000F:0A000008*/ instance void [mscorlib/*23000001*/]System.Runtime.InteropServices.ClassInterfaceAttribute/*0100000A*/::.ctor(int16) /* 0A000008 */ = ( 01 00 00 00 00 00 ) ...
| | | .custom /*0C000010:0A000009*/ instance void [mscorlib/*23000001*/]System.Runtime.InteropServices.ComSourceInterfacesAttribute/*0100000B*/::.ctor(string) /* 0A000009 */ = ( 01 00 0F 61 78 62 2E 61 78 62 53 6F 75 72 63 65 // ...axb.axbSource ...
| | | .custom /*0C000011:0A000001*/ instance void [mscorlib/*23000001*/]System.Runtime.InteropServices.GuidAttribute/*01000002*/::.ctor(string) /* 0A000001 */ = ( 01 00 24 43 44 42 46 36 42 33 33 2D 45 32 33 46 // ..$CDBF6B33-E23F ...
| | | .custom /*0C000012:0A000002*/ instance void [mscorlib/*23000001*/]System.Runtime.InteropServices.TypeLibTypeAttribute/*01000003*/::.ctor(int16) /* 0A000002 */ = ( 01 00 02 00 00 00 ) ...
| | |___[MET] method .ctor : void()
| | |___[MET] method equals : bool(object)
| | |___[MET] method getClass : object()
| | |___[MET] method get_axb_Handle : int32()
| | |___[MET] method hashCode : int32()
| | |___[MET] method notify : void()
| | |___[MET] method notifyAll : void()
| | |___[MET] method toString : string()
| | |___[MET] method wait : object(object,object)
AccessViolationException exception
System.AccessViolationException was unhandled
Message=Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Source=mscorlib
StackTrace:
at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck)
at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache)
at System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean fillCache)
at System.Activator.CreateInstance(Type type, Boolean nonPublic)
at System.Activator.CreateInstance(Type type)
at WindowsApplication1.Form1.getPatientHandle_Click(Object sender, EventArgs e) in C:\Documents and Settings\Elie A. Cohen.USINC022\my documents\visual studio 2010\Projects\Repo API Example\Repo API Example\Repo API Example.vb:line 13
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(ApplicationContext context)
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
at WindowsApplication1.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException:

In case you haven't figured it out already... Or if anyone else is curious... Or for myself when I get old and forgetful...
h2. Object Creation
For starters, when you create an ActiveX object from within VB, use:
Set myObject = CreateObject("JavaObject.Bean")When I refer to JavaObject.Bean, I'm meaning the full object name + ".Bean". So, in your case, you should use:
Set myObject = CreateObject("xxx.axb.Bean")h2. Location
The .dll file must be located in the JRE that is used at the time of calling. Meaning, the .dll file must be placed under <jre_home>\axbridge\bin and registered there.
In your case:
DLL:
C:\Program Files\Java\jre6\axbridge\bin
Jar:
C:\Program Files\Java\jre6\axbridge\libh4. A Note:
The only supported JRE is a 32bit version as far as I know with regards to the ActiveX bridge. Just like the packager.exe can only be found in the 32bit JDK.
h2. Methods
h3. Object Types
ActiveX Bridge does not support passing literals or arrays. However, it does support passing java's primitive data types as Objects.
Simply meaning:
h4. Invalid:
public int get_axb_Handle() {
     int Address = 12345678;
     return Address;
}h4. Valid:
public Integer get_axb_Handle() {
     int Address = 12345678;
     return Address;
}On a normal circumstance, there's little difference between the two methods. However, in the second example, the JVM does a typecast from a literal data type to a object data type, resulting in a valid object to pass through to Visual Basic. Now, obviously there are multiple ways to do a proper change, new Integer(int) for example. It doesn't matter to me. At the end of the day, you have to pass an object.
As a side note, the same idea applies when receiving data from Visual Basic.
h4. Invalid:
public void set_axb_Handle(int newHandle) {
     int Address = newHandle;
}h4. Valid:
public void set_axb_Handle(Integer newHandle) {
     int Address =newHandle;

ResourceBundle throws MissingResourceException when calling Java from C

All,
Our code calls Java from C application.
The C code create JVM using JNI_CreateJavaVM. Due to internal design issues we don't
create the JVM with a "-classpath" option.
After creating the JVM, we create a ClassLoader (URLClassLoader), with a URL list as it's classpath.
The last step in the C code is to load a Java class using the C reference to URLClassLoader.loadClass
(I will refer to this class as classA), and than call one of it's static methods.
Please notice that classA is not instantiated, we call a static method.
At this point we are moving to the Java code...
In the Java static method we call ResourceBundle.getBundle("resources.messages"),
the result is ResourceBundle throws MissingResourceException.
- The JAR hosting "resources/messeges.properties" (refer as jarA) is include in the
ClassLoader URL paths we used for loading the Java class.
- Using a debugger we can see that ClassLoader.getSystemClassLoader() don't contain
jarA in it's URL list.
- Using the debugger we see that classA.class.getClassLoader() does contain
jarA in it's URL list.
After some investigation we see that ResourceBundle.getBundle calles to ResourceBundle.getLoader:
private static ClassLoader getLoader() {
        Class[] stack = getClassContext();
        /* Magic number 2 identifies our caller's caller */
        Class c = stack[2];
        ClassLoader cl = (c == null) ? null : c.getClassLoader();
        if (cl == null) {
            cl = ClassLoader.getSystemClassLoader();
        return cl;
    } getClassContext() - native method, this can explain the why the above work fine for Windows.
I suspect the problem raised in the above code. Since I couldn't get a debug
version of rt.jar for Solaris, I need some help.
Our environment is Solaris 8, Java 1.5.
Please note that the same code works fine on WindowsXP with the same Java version!
Thanks,
Avi

I was thinking JVM should the classpath when it is invoked. But obviously it is not and we need to assign the classpath ourselves when invoking from native side. Thanks for pointing that out. For other people's benefit the following is the code piece I for initializing JVM.
char* str1;
          char* str2;
          char* classpath;
          str1 = "-Djava.class.path=";
          str2 = std::getenv("CLASSPATH");
          classpath = (char*)malloc(strlen(str1) + strlen(str2) + 1);
          strcpy(classpath, str1);
          strcat(classpath, str2);
          if (str2 == NULL)     {
               printf("CLASSPATH environment variable is not defined.");
               exit(1);
          m_VmArgs.version = JNI_VERSION_1_4;
          m_options[0].optionString= classpath;
          m_VmArgs.options = m_options;
          m_VmArgs.nOptions = 1;
          m_VmArgs.ignoreUnrecognized = JNI_TRUE;
          JNI_GetDefaultJavaVMInitArgs(&m_VmArgs);
          /* Create the Java VM */
          m_Res = JNI_CreateJavaVM(&m_Jvm, (void**)&m_Env, &m_VmArgs);
          if (m_Res < 0) {
               printf("Can't create JVM\n");
               exit(1);
thanks,
chancellor

Questions abt. calling Java from C

I have a java class that contains a method I need to make accessable to C functions. It looks something like this:
public class ExportName
   private SomeObj theObj;
   public ExportName(SomeObj theObj)
      this.theObj = theObj;
   } //end ExportName
   public String getName()
      return theObj.getName();
   public native String getNameJNI();
}Using javah I have my ExportName.h, and I'm in the process of writing ExportName.c:
#include <stdio.h>
#include <jni.h>
#include "ExportName.h"
JNIEXPORT jstring JNICALL Java_ExportName_getNameJNI (JNIEnv *, jobject)
   jclass cls = (*env)->GetObjectClass(env, obj);
   jMethodID mid = (*env)->GetMethodID(env, cls, "getName", "()Ljava/lang/String");
   if (mid == 0)
      return;
   } /* end if */
}I have 2 questions:
(1)At some point, I need to actually call the java method using
(*env)->Call<TYPE>Method(env, obj, mid);
What type should I use here (CallWhatMethod)?
(2)Also, I need to create genuine C wrappers for these methods. How do I hand off the jstring returned by this JNI C code to the ANSI C method that calls it? I know that there is a conversion along the lines of:
const char str = (env)->GetStringUTFChars(env, <<JSTRING HERE>>, 0);
Can I just put the call to the JNI method where the jstring variable name goes?
Any help would be appreciated. I have already read the Java tutorial on JNI, so please don't respond just to tell me to go there.
Thanks!

If that is the case, then your starting point is not javah, but to investigate the invocation API, after which you will call java methods from C.
Well, the Invocation API is mostly orthogonal to whether you are calling Java from C or vice versa. The Invocation API is mostly about creating/destroying VMs. You can call Java methods from a flat C application or you can call Java methods from C from within Java native methods.
If you want to call Java from C, you need to use the methods you're using like GetMethodID, CallXXXMethod, etc...
In your particular example, if you wanted to call ExportName.getName(), you would use CallObjectMethod. You would cast the result to a jstring, and then use GetStringUTFChars, ReleaseStringUTFChars, etc...
God bless,
-Toby Reyelts
For a solution to all your JNI woes, check out Jace - http://jace.reyelts.com/jace

Calling java from csh scripts

I have recently come across certain projects where Java has being used as an alternative for scripting purposes. What I am trying to say here is that making calls to java programs from csh scripts and these Java programs are merely doing trivial/sql tasks which could have very well been carried out in a scripting language itself. and then Java calling some scripts so ending up with a chain of Java calling scripts which call Java and so on.
It has been my understanding all along that such a design would not be something recommended, and there should be a separation of concerns and a clear demarcation between Java and the scripting code. What however I am struggling with is finding some articles or papers supporting this thought and I would greatly appreciate if some you have something you would like to share preferably an article, supporting or negating such a design.
Edited by: kilyas on Mar 25, 2010 2:52 PM

>
Actually my original post was a reply to Saish. But thanks for the input. It's good to know that you extend TDD to scripting as well, but most of the scenarios I have come across thats not been the case. Whether thats the lack of test tools/libraries like JUnit or JMock for csh scripting or the user's frame of mind of getting things done, I am not sure.There's no need for such tools. Even in Java et al, test harnesses can be hand-whittled. JUnit is just Java code, after all. Test harnesses for scripts are no different. As an extremely basic example, you might a file that picks up everything from one directory, run a sed application against it, and dump the results in another directory. Writing tests for that is pretty easy; start with a couple of sample input files, and expected outs, apply your script, do a diff on the resut against the expected outs. Granted there isn't a nice UI to give you a green bar with shell scripts, but you can still get a list of pass/fail stats. Groovy scripts, of course, can be run in an actual JUnit runner.
If you're finding it too hard to test scripts, like perhaps there are too many different flows of execution through the script, it's worth considering whether the task-at-hand is really a scripting job at all. The sweet spot for scripts is gluing together the stuff that performs all the complex logic.
What are the best practices recommendations for such a scenario, I am sure there much be something about it or some pattern or anti pattern dealing with it and some review of such an implementation. Don't you think so?I hope so! I've been tasked with documenting a scripting standard written by another developer, finding references to cite and such-like. There do exist coding standards on the web for scripting, shouldn't be too hard to find something useful. As for reviews, I expect simple peer review by someone else who knows scripting is about as good as it's going to get.
I'd add that logging plays an important part in scripting, just as it does in your "real" code

Problem in generate Java from PL SQL package in Jdeveloper

Hi
i have problem in create java class from PL SQL package in JDeveloper.
I use Database navigator of jdeveloper and right click on a package and choose Generate Java then in Jpublisher window choose my view Controller and accept other default values.
I call methods of generated class in the Action of a button in my JSP page, but when I click the button it throw null pointer exception !!! i fund one of generated method return null and it lead to this exception.
protected DefaultContext __tx = null;
public DefaultContext getConnectionContext() throws SQLException {
if (__tx==null){
__tx = (getConnection()==null) ? DefaultContext.getDefaultContext() : new DefaultContext(getConnection());
    return __tx;
public Connection getConnection() throws SQLException
    if (__onn!=null) return __onn;
     else if (__tx!=null) return __tx.getConnection();
     else if (__dataSource!=null) __onn= __dataSource.getConnection();
     return __onn;
i try to generate class in Model project and create DataControl for that and use method action but noting change and i get null pointer again!!
Jdeveloper Versino = 11.1.1.7.0

Let me ask you another question: Why do you generate java from the package at all?
Where do you want to call the package?
Back to your question: you should see code like
    public void setDataSourceLocation(String dataSourceLocation) throws SQLException {
        javax.sql.DataSource dataSource;
        try {
            Class cls = Class.forName("javax.naming.InitialContext");
            Object ctx = cls.newInstance();
            java.lang.reflect.Method meth = cls.getMethod("lookup", new Class[] { String.class });
            dataSource = (javax.sql.DataSource) meth.invoke(ctx, new Object[] { "java:comp/env/" + dataSourceLocation });
            setDataSource(dataSource);
        } catch (Exception e) {
            throw new java.sql.SQLException("Error initializing DataSource at " + dataSourceLocation + ": " + e.getMessage());
in the generated code. This code look up a datasource (which you have defined e.g. on the Weblogic Server) by calling the method
setDataSourceLocaltion("jdbc/HRConnDS");
This look up the datasource nad stores it in the class variable.
Timo

URGENT - Call java from pl/sql

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