Accessing Java Class using JNDI

Hi,
I am looking for a way for accessing a java class (non-ejb) and invoking a method in it using JNDI.
Thanks

See if the follwing helps u
1).implement Referencable interface for your java class. Implement serialize interface also.
2).Referencable interface has a methd referencable() which will be invoked by JNDI naming system when a lookup is made by client.
3) in referencable method create a Refrence object.(Reference is a api class).This Reference object can be created to contain a lot of info about the remote obj u have registered. In that u can say the class that be used to create your client side stub.
4).now when client does a lookup, jndi creates a stub using Reference object and sends it to client.
5)the methods now u call gets passed on to actual machine running ur remote object

Similar Messages

Can not locate Java class using JNI within C++ DLL

I am using trying to use JNI to call a Java class from C++. The Java class uses JMS to send messages to a JMS message queue. At first I coded the C++ in a console application that created the JavaVM and used JNI to access the Java class. All worked fine. Then I called the Java class using JNI from threads and ran into the problem of the Java class not able to locate the JMS related classes. This was solved by placing the following line in the constructor of the Java class.
Thread.currentThread().setContextClassLoader(ClassLoader.getSystemClassLoader());
Then I moved the JNI code from a console application to a DLL in specific an extension DLL that is called by SQL Server or Oracle server. The DLL will use JNI to call the Java class and send messages to a JMS message queue.
The problem I am having now when the DLL code is called by SQL Server the call to
JNI_CreateJavaVM
appears to work correctly but the call to find the Java class using
jvmEnv->FindClass(pName)
fails. It appears the is a class loading problem which occurs due to the fact JNI is called from a DLL. When the VM is created I pass the class path information using the statement
-Djava.class.path=
And as I stated before it all works when running from a console application. I am new to JNI and really need help in the form of some sample code that will solve this problem. I believe I need to somehow load the classpath information from the DLL but I can not find examples on how to do this using JNI. I have tried several ways using URLClassLoader and getSystemClassLoader from JNI and either it does not work or it crashes very badly.
I used the following code to determine what the existing class path is and the string returns empty.
jcls = jvmEnv->FindClass("java/lang/System");
jmid = jvmEnv->GetStaticMethodID(jcls, "getProperty", "(Ljava/lang/String;)Ljava/lang/String;");
jstrClassPath = jvmEnv->NewStringUTF("java.class.path");
jstr = (jstring)jvmEnv->CallStaticObjectMethod(jcls, jmid, jstrClassPath);
m_jstr = (jstring)jvmEnv->NewGlobalRef(jstr);
pstr = jvmEnv->GetStringUTFChars(m_jstr, 0);
Can anyone please help with example code that will solve this problem. Thanks in advance for any help.
Charles�

I have determined the problem occurs when the application/component is compiled using VC 6.0. The test application was compiled using VC 7.1 and works correctly by locating the class path information. If the test application is compiled using VC 6.0 it has the same problem.
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Accessing java classes from javascript

Hi,
I have the following javascript function
function testjava {
    var myString = new java.lang.String("Hello world"); // line 1
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}It gives me a error at line 1 saying "'java' is undefined" in IE browser 5.5 sp2. But, both the lines execute correctly in netscape 6.
Can someone please help..
Thanks,
Vijay.

It seems that IE 5.5 doesn't support accessing java classes in JavaScript, so try to install IE 6 to see if it works or maybe, you doesn't have installed propertly support for JVM in IE.

Can anyone help i want to call java class using visual basic

I want to call java class using visual basic and send some arguments to the main class

Hi,
I don't know VB, but you can surely launch a command line like :
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Regards

Urgent !!!!!!!!!!!! regarding CREATE JAVA CLASS USING BFILE

We have Oracle 8.1.7 spatial database. We got to load some java classes into the database. We would like to make it as the java programs to be loaded from a client system into the oracle server. I am using CREATE DIRECTORY command to create a directory object (say suppose \\prav\loadjavaclasses\. Then using the CREATE OR REPLACE JAVA CLASS USING BFILE (object_name, 'CLASSNAME.CLASS'). This .class file is in the network identified by prav which in turn has a shared directory (full privileges) loadjavaclasses folder. Can you please help in this regard.
Please mail me to [email protected]
thanks in advance
SudhaSrikanthan
null

use loadjava

Synchronized method in a java class used by many interfaces

My interface (idoc to file) is using a java class, which has one method that reads a table from a central database and after doing some calculations updates it.
(The interface instantiate the class inside a user-defined function and calls the method there.)
The problem is that if somebody sends 100 idocs at the same time, there can be a dirty read, I mean, a read just before other interface updates the table.
We want the following:
Interface 1:
- Read counter from the table (counter = 5 )
- Increment counter (counter = 6)
- Update table with that counter (table with counter = 6)
Interface 2:
- Read counter from the table (counter = 6 )
- Increment counter (counter = 7)
- Update table with that counter (table with counter = 7)
RESULT: The table has the counter = 7
But what is happening is the following:
- Interface 1 reads (counter = 5)
- Interface 2 reads (counter = 5)
- Interface 1 increments counter (counter = 6)
- Interface 2 increments counter (counter = 6)
- Interface 1 updates table (table with counter = 6)
- Interface 2 updates table (table with counter = 6)
RESULT: The table has the counter = 6 (WRONG)
I made the method synchronized. What I was expecting was that only one interface (i1) could enter the method (read the table and update it) while other interfaces running at the same time would have to wait until i1 finished that method.
My first test indicates that's not happening. Can anybody help me to find a solution?

Hi Bhavesh,
If the QOS is EOIO this means that the integration engine manage the call to the mapping program (and all the other blocks) inside an "internal" synchronized method.
So this means that in this case you do not need to manage the queued access (synchronization) inside your custom java code because it is already enveloped in a queued block by XI.
The problem that Jorge had can be easily reproduced using the sample code that follows:
class Synch Object
import java.util.Date;
public class SynchObject {
 String strName;
 public SynchObject(String strName){
 this.strName = strName;
 public synchronized void syncWrite(String strCaller) throws InterruptedException{
 Date now;
 now = new Date();
 System.out.println("-- " + now.toLocaleString() + " " + strCaller + " entering syncWrite of " + strName);
 System.out.flush();
 Thread.sleep(1000);
 now = new Date();
 System.out.println("-- " + now.toLocaleString() + " syncWrite of " + strName + " called by " + strCaller );
 System.out.flush();
 Thread.sleep(1000);
 now = new Date();
 System.out.println("-- " + now.toLocaleString() + " " + strCaller + " leaving syncWrite of " + strName);
 System.out.println("");
 System.out.flush();
class Caller
public class Caller implements Runnable {
 String strName;
 SynchObject target;
 int intMax;
 public Caller(String strName, SynchObject target, int intMax) {
 this.strName = strName;
 this.target = target;
 this.intMax = intMax;
 public void run() {
 for(int i=0; i<intMax;i++)
 try {
 target.syncWrite(strName);
 } catch (InterruptedException e) {
 e.printStackTrace();
class Workbench
public class Workbench {
 public static void main(String[] args) {
 // TODO Auto-generated method stub
 SynchObject sObj1 = new SynchObject("syncObj1");
 SynchObject sObj2 = new SynchObject("syncObj2");
 Caller c1 = new Caller("caller1",sObj1,2);
 Caller c2 = new Caller("caller2",sObj1,2); '[*CHANGE*]
 Thread ct1 = new Thread(c1);
 Thread ct2 = new Thread(c2);
 ct1.start();
 ct2.start();
Run the workbench class to see what happen when setting QOS EOIO (the synch object is the same).
To see instead what happen now (missing synchronization) you have to change in Workbench class the statement
Caller c2 = new Caller("caller2",sObj1,2); '[*CHANGE*]
with
Caller c2 = new Caller("caller2",sObj2,2); '[*CHANGE*]
The reason is that every instance of the mapping program declare a new instance of the "Synchronized object" so the calls are synchronized inside the same mapping program but not between several mapping program.
Hope this give you a better idea on this problems with java synchronization, but if you have further doubts (I know it's a little bit tricky ) feel free to ask.
Kind Regards,
Sergio

Problems Creating a Java Class using a webservice with certificate

hi,
i'm developing a java class that call's a webservice that needs a certificate, i'm not used to work with java, last time was 10 years ago, so i'm having some troubles because of the certificate.
I already add the certificate using java control panel > Security > Certificates. When testing i get the following error: IOException (java.io.IOException: subject key, Unknown key spec)
I think I need to define the certificate in my class, but i'm having a lots of trouble with the samples that i found over the internet, nothing works and i'm running out of time.
This is my Class
create or replace and compile java source named "FishInfoAt" as
import java.net.*;
import java.io.*;
import java.security.*;
public class FishInfoAt
     public FishInfoAt()
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          String response = "";
          String msgtotal = mensagem+mensagem1+mensagem2+mensagem3;
          String a = "";
          HttpURLConnection conn = null;
          try{
               URL url = new URL(urlfishinfoat);
               conn = (HttpURLConnection) url.openConnection();
               conn.setRequestMethod("POST");
               conn.setRequestProperty("Content-type", "text/xml; charset=utf-8");
               conn.setRequestProperty("SOAPAction", "https://servicos.portaldasfinancas.gov.pt:401/sgdtws/documentosTransporte/");
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               out.write(msgtotal.getBytes());
               out.flush();
               InputStream in = conn.getInputStream();
               int value;
               while( (value = in.read()) != -1)
                    response+=(char)value;
          catch(Exception e)
response = ("*** ERROR - IOException (" + e.getMessage() + a + ")");
return response;
/

Hi Deepak,
Could you please let us know upto which line your code is going safe. Try printing the value in the structure before you send that to the method GetUGEntity().
I am not too sure that would be a problem. But I have faced a problem like this, wherein I tried to access a structure for which I have not allocated memory and hence got exception because of that.
Since your JNI code seems to be error free, I got doubt on your C part. Sorry.
Dhamo.

Accessing java class in JSP on Tomcat 5.5 server

Just i want to use a java class in JSP.
Explanation in following steps :
a. MY JSP Code - SimpleBean.jsp
b. My Java file - test.java
c. Path ( Root, jdk, jre , myfiles-test.java, SimpleBean.jsp )
d. Environment Variables
e. Error Message faced
Now Brief explanation.
a. MY JSP Code :
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*,test" errorPage="" %>
<td>
<%! test obj = new test();
obj.setAge(32); %>
<%= obj.getAge(); %>
</td>
b. My Java file - test.java
package test;
class test
private int age;
public int getAge()
 return age;
 public void setAge(int intage)
 this.age = intage;
c. Path ( Root, jdk, jre , myfiles-test.java, SimpleBean.jsp )
Tomcat Root : c:\Program Files\apache\tomcat5.5\webapps\ROOT
jdk : C:\Program Files\Java\jdk1.5.0\bin;
jre : C:\Program Files\Java\jre1.5.0\bin;
test.java : c:\Program Files\apache\tomcat5.5\webapps\ROOT\NRMS\test\test.java
SimpleBean.jsp : c:\Program Files\apache\tomcat5.5\webapps\ROOT\NRMS\test\SimpleBean.jps
d. Environment Variables :
PATH :
C:\Program Files\Java\jdk1.5.0\bin; C:\Program Files\Java\jre1.5.0\bin;
CLASSPATH :
.;C:\Program Files\Java\jre1.5.0\bin;
e. Error Message Faced : ( on accessing url http://localhost:8080/NRMS/SimpleBean.jsp )
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP
Generated servlet error:
The import test cannot be resolved
An error occurred at line: 26 in the jsp file: /NRMS/test/SimpleBean.jsp
Generated servlet error:
test cannot be resolved (or is not a valid type) for the field SimpleBean_jsp.obj
An error occurred at line: 26 in the jsp file: /NRMS/test/SimpleBean.jsp
Generated servlet error:
test cannot be resolved or is not a type
An error occurred at line: 26 in the jsp file: /NRMS/test/SimpleBean.jsp
Generated servlet error:
Syntax error on token(s), misplaced construct(s)
An error occurred at line: 26 in the jsp file: /NRMS/test/SimpleBean.jsp
Generated servlet error:
Syntax error on token "32", delete this token
An error occurred at line: 28 in the jsp file: /NRMS/test/SimpleBean.jsp
Generated servlet error:
Syntax error on token ";", delete this token
 org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
 org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
 org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:389)
 org.apache.jasper.compiler.Compiler.compile(Compiler.java:288)
 org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
 org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
 org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:556)
 org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:296)
 org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:245)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.4 logs.
Apache Tomcat/5.5.4
Please explain where i am doing the mistake.
Thanks in advance.
Regards,
Lax.

>
<%@ page contentType="text/html; charset=iso-8859-1"
language="java" import="java.sql.*,test" errorPage=""
%>Your class is test.test.The compiler wouldnt know what test is from your import.
Change import as
java.sql.*,test.test
<%! test obj = new test();
obj.setAge(32); %>The symbol '!' ?

Accessing Java Classes from Forms

Is is possible to access a Java class from Forms? I have been
creating an Active X control that returns a Java object, and from
that I can call methods on that object, but I would really like
to do that without having and Active X control in the mix. Any
suggestions?
null

Oracle Developer Team wrote:
: Robert Nocera (guest) wrote:
: : Oracle Developer Team wrote:
: : : hey robert -
: : : Developer 6.0 provides this ability for web deployment.
You
: : can
: : : insert your own custom Java components into your
application
: : and
: : : they will appear in the application when it is run via the
: web.
: : : If you look at the documentation for 6.0, there are a few
: : : section son Pluggable Java Components and JavaBeans that
: : : describes what is provided and how you use the interfaces
: and
: : : classes we provide.
: : : A whitepaper on this topic will be posted to the OTN
: shortly,
: : as
: : : well as some samples that illustrate how to go about doing
: it.
: : : cheers!
: : : -Oracle Developer Team-
: : Thanks for the quick response. Is there any way to access
: those
: : classes without being in a web deployment. That's probably
: not
: : totally out of the question, but what we had in mind was
: adding
: : some Java Functionality (actually connectictivity to some
EJBs
: : that we have) to existing forms. Currently there forms are
: not
: : deployed in a "web" environment and are just run from the
: forms
: : runtime engine.
: : -Rob
: hey again robert -
: there's no easy way (yet!) to call out from forms runtime
: process to a Java application.
: We've played around some with creating an ORA_FFI interface to
: JNI and then wrappering this with PL/SQL code. We've been able
: to make calling into an EJB running in 8i from a forms runtime
: work using this approach.
: Let me know if this is of interest to you and I can post the
: stuff we've currently got. It's no more than a simple demo and
: is not complete. It requires quite a bit of manual coding on
: the PL/SQL side since the interface emulates JNI (FindClass,
: GetMethodID, CallMethodID, etc.).
: cheers!
: -the Oracle Developer Team-
I'd be interested in this ORA_FFI doc you've been playing with.
Would you please email it to me or post it.
null

Error in accessing Java Class?

I got an error when accessing JavaClass,
The Java Class is following,
packages mypack;
public class myParentClass{
public myParentClass{
public String doAct(String act){
return act;
public static act class {
public static final String ADD="ADD";
public static final String DELETE="DELETE";
And I am using JavaBean as the following,
<%@ page import="mypack.*"%>
<jsp:useBean id="mybean" scope="page" class="myParentClass"/>
<%
String act=mybean.doAct(mybean.act.ADD);
%>
The error I got is "No variable act defined in class myParentClass"
I don't know why! How can I solve it?
Thanks in advance!

hi, you lose a semicolon ";" .
you should add ";" at the end of the definition of "act" as:
public class myParentClass{
public myParentClass{
public String doAct(String act){
return act;
public static act class {
public static final String ADD="ADD";
public static final String DELETE="DELETE";
}; // this is the error .

How to Transport Java Classes used in Mapping?

Hi XI experts,
Within the development of one message mapping, some external java classes are imported and used in my UDF(user defined function). My question is: how will these external java classes be transported to the QA/PRD system? If I choose to use the file system transport method, do I have to manually find these jar files and transport them separately?
Any comments or suggestions are highly appreciated.
Thanks in advance
Luis

Hi Luis,
Normally Mapping programs and External Jars are used in XI using Imported Archive. So this Imported archive once activated will become part of your SWCV and can be transported automatically with the SWCV.
You dont have to worry about transporting it seperately, it will be avilable once you transport your SWCV using File system transport.
Hope this helps,
Regards,
Ananth

Accessing Java Classes from Webservice Stubs

So far I have been able to call a web service and copy the appropriate directories and files to the designated class path. I can also successfully access a class file like this:
MyObject = CreateObject("java", "ca.x.y.z.TestCollection.TestItem");
However, whenever I try to do something with that variable, I get a white screen. Any text that should have appeared before the command, will appear, but nothing appears afterwards, not even debugging info. Here are a couple of commands that will cause this to happen.
<cfdump var = "#MyObject#">
MyObject = CreateObject("java", "ca.x.y.z.TestCollection.TestItem").init();
x = MyObject.init();
Anybody have any ideas?

Ah, nothing like a fresh set of eyes to remind of the fundamentals. Thank you for that.
I actually could create a normal error by calling a method incorrectly. I would see the grey box and my debgging info would appear. However, if I did something I expected to succeed, it would seem to stop. Any text above that command would appear. No error message, no de-bugging.
But I didn't think to look in our error log. I see things like:
Could not initialize class com.microsoft.schemas._2003._10.Serialization.Arrays.ArrayOfstring
or
org.apache.axis.description.TypeDesc.(Ljava/lang/Class;Z)V
At least it's not a mystery anymore. Thanks again for suggesting the error log.

Simple Java class using SQLJ not compiling.

Hello all, I have a simple Java class that is using SQLJ. It will not compile though. I am not sure what I should set for classpath. Any ideas? This is what I have so far.
set PATH=C:\jdk1.2.2\bin;c:\oracle\ora81\jdbc\bin;
set CLASSPATH="C:\oracle\ora81\jdbc\lib\classes12.zip;C:\oracle\ora81\sqlj\lib\runtime12.zip;C:\oracle\ora81\sqlj\lib\translator.zip;C:\jdk1.2.2\lib\*.*"
then
javac SQLJTester.java
Here is my .java file ---
import java.io.*;
import java.sql.*;
import sqlj.runtime.*;
import sqlj.runtime.ref.*;
public class SQLJTester {
public static void update() throws Exception {
java.sql.Timestamp timeNow;
#sql {
BEGIN
:timeNow := sysdate;
END
public static void main (String[] args) {
try {
SQLJTester.update();
System.out.println ("Updated successfully");
catch (Exception e) {
System.out.println ("Caught an exception.");
Thanks ahead for your time,
Justin

When sqlj files are compiled and translted to java file with them the file with extension .ser is also generated. browsers do not recognise this .ser files they only understand .class files which the download using <codebase> instead of class path. so thats why you r not able to use sqlj in servlet. try to customize the profile. Now can some one inform how to use sqlj from eclipse. does it support?. i need to downoad sqlj.exe for that. if anyone has idea from where i can download sqlj.exe pls inform me at [email protected]

Problems calling java classe using WSIF in BPEL 10.1.3.3

Hi,
I am working on a POC for a telecom gaint in Sweden. One of their requirement is to invoke java library.
Inorder to do it, I have followed the below steps:
1. Wrote a wrapper java code to a class in this library.(Attached with this mail)
2. Using JDEV 10.1.3.3 created a wsdl file of WSIF binding type for invoking this wrapper class.(Attached with this mail.)
3. Created the required fascade classes using the SCHEMAC option in command prompt.
4. Placed all the class files including the wrapper class file in %BPELHOME%\bpel\system\classes
5. Created a BPEL process to invoke the wsif wsdl.
However while Invoking the BPEL process I am getting the error"com.collaxa.cube.ws.wsif.providers.java.WSIFOperation_Java@9ecad : Could not invoke 'authenticate'; nested exception is:
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Can someone tell me how to resolve this issue.
I have to do a presentation on this in 2 days.
Thanks for the help.
Regards,
Gautham

Hi in BPEL XML,
Enter the credientials,
I have pasted the Sample BPEL file.
<?xml version="1.0"?>
<BPELSuitcase>
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 <partnerLinkBinding name="client">
 <property name="wsdlLocation">BankTransferFlow.wsdl</property>
 </partnerLinkBinding>
 <partnerLinkBinding name="bankTransfer">
 <property name="wsdlLocation">BankTransferServiceDesign.wsdl</property>
 <property name="wsdlRuntimeLocation">BankTransferService.wsdl</property>
 <property name="java.naming.security.principal">oc4jadmin</property>
 <property name="java.naming.security.credentials">welcome1</property>
 <property name="dedicated.connection">true</property>
 </partnerLinkBinding>
 </partnerLinkBindings>
<configurations>
<property name="testIntroduction"><![CDATA[
 This demo showcases the integration of session beans into
 an end-to-end business process. The database has 2 accounts 11111 and 22222 and both of them have initial balance 1000.
 ]]></property>
<property name="defaultInput"><![CDATA[<BankTransferFlowRequest xmlns="http://samples.otn.com">
<fromAccount>11111</fromAccount>
<toAccount>22222</toAccount>
<amount>10</amount>
</BankTransferFlowRequest>
]]></property>
<property name="transaction">participate</property>
<property name="inMemoryOptimization">true</property>
</configurations>
 </BPELProcess>
</BPELSuitcase>
Thank you,
[email protected]

Run java class using JBuilder

hi,
I already import the java class forder to the src folder in JBuilder where the src folder is created by the JBuilder itself. When i run compile the program there is an error in reading the java class file but when i run the program in Textpad, the program is success. May i know why? how can i run my program using java class in JBuilder instead of Java source? Thanks.

In JBuilder there is an option of specifying what the 'main' file in a project is . Specify that to this class file
[ What I mean is , in many java files we can define 'main' method , but we will intend to execute the main of one file only for a project . In JBuilder specify this file as the main class file ]

Accessing Java Class using JNDI

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