Access a normal java class from EJB

how can i access normal java class from an EJB.
I do not want to write the business logic inside the EJB. How can I achieve this.

There's no special API for doing this. Just use normal java. E.g.
@Stateless
public class FooBean implements Foo {
public void foo() {
// access non-EJB utility class Bar
Bar b = new Bar();
b.bar();
}

Similar Messages

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

Call Bean from normal java class

Dear Friends,
Is it ok to call an entity bean or session bean frm normal Java class.
(Java class is in the same application as the beans).
Is there a special way to lookup the beans from normal java classes.
Thanking You,
Chamal.

it is ok and very commonly done.
Note that the simple java program must be running in the same local network. You cannot have the java program and EJBs distributed over internet. (I m not certain of it, but mostly I shoudl be correct. If you have the resources, try it out and let me know)
In most of the cases, EJBs are called by
1. A servlet
2. Another EJB
3. a simple java program.
In the first 2 cases, you can go for Local Interfaces (more so in the second case than the first). The reason being that the the client and server will be in the same JVM (typically the Application server). Thus, in the first case, if the Web container and the ejb container are in the same app server, EJBs can be local.
However, in the third case, it is unlikey that you will have the client runnng and the same jvm as the server, because the app server has its own jvm.
sample code (this method is being called from the main method of a simple java program. it is self explanatory):
public void processRequestForSessionBean()
         System.out.println("REQUEST RECEIVED");
         try
               Hashtable nameHashtable = new Hashtable();
               nameHashtable.put( Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory" );
               nameHashtable.put( Context.PROVIDER_URL, "t3://localhost:7001" );
               InitialContext context = new InitialContext(nameHashtable);
               System.out.println("created initial context");
               Object lookupObject = context.lookup("CustomerBean");
               System.out.println("Got the lookup object");
               CustomerDataHome home = (CustomerDataHome) PortableRemoteObject.narrow(lookupObject,
                         Class.forName("com.shiv.business.CustomerDataHome"));
               System.out.println("Home interface");
               customerData = home.create();
               System.out.println("Remote Interface");
               addDataToSB(customerData);
               ArrayList namesList = customerData.getNames();
               System.out.println(namesList.toString());
               //customerData.remove();
          catch (Exception exception)
               System.out.println("FATAL ERRORS");
               exception.printStackTrace();
          }

Using normal java classes to access database

Dear friends,
Is it a good practice to make database calls from a normal java class within J2EE environment.
What I meant by a normal java class is a class which is not an enterprise bean.
Best Regards,
Chamal.

it is quite normal.
If you make your own DAOs, it may not be efficient/generic.
JSP/Servlets can use Hibernate (which is a set of POJOs) to access DB. Thus you have a J2EE environment using a very matured DB access methodoloy, and doing away with Enterprise bean.
regards

Accessing a Java class from C when class is in a package

I'm accessign a java class from C using JNI: The JVM exists and I can access the class fine:
jclass cls; //java class
cls = (*env)->FindClass(env, "MyClass");
However when I put the class in a package I can't access it
cls = (*env)->FindClass(env, "mypackage.MyClass");
Does anyone know How I can access a java class in a package using JNI.
Thanks
..

Been a while since I've done anything with JNI, But... Did you try this:
cls = (*env)->FindClass(env, "mypackage/MyClass");

Calling java class from SLSB

I am trying to call a java class from SLSB . There are external jars which are imported in my java class . When i try to instatiate the java class in SLSB. It ia not able to access the external jars. It gives the following exception :
0000002e ExceptionUtil E CNTR0020E: EJB threw an unexpected (non-declared) exception during invocation of method "applyRules" on bean "BeanId(MDB_SLSBEAR#MDB_SLSB.jar#msgProcess, null)". Exception data: java.lang.NoClassDefFoundError: org.springframework.context.ApplicationContext
My code is as follows :
SLSB:
package com.vsnl.ejbs;
import com.vsnl.pricing.bizObjects.CustomizedRateRequest;
import com.vsnl.pricing.bizObjects.RateRequest;
import com.vsnl.pricing.dao.ARR.AutoprocsMain;
import org.springframework.context.ApplicationContext;
* Bean implementation class for Enterprise Bean: msgProcess
public class msgProcessBean implements javax.ejb.SessionBean {
static final long serialVersionUID = 3206093459760846163L;
private javax.ejb.SessionContext mySessionCtx;
* getSessionContext
public javax.ejb.SessionContext getSessionContext() {
return mySessionCtx;
* setSessionContext
public void setSessionContext(javax.ejb.SessionContext ctx) {
mySessionCtx = ctx;
* ejbCreate
public void ejbCreate() throws javax.ejb.CreateException {
* ejbActivate
public void ejbActivate() {
* ejbPassivate
public void ejbPassivate() {
* ejbRemove
public void ejbRemove() {
public void applyRules(CustomizedRateRequest customizedRateRequest){
System.out.println("RR ID in SLSB***"+customizedRateRequest.getProductCustomerId());
System.out.println("RR ID in SLSB$$$"+customizedRateRequest.getIsDestFlag());
try{
System.out.println(" before the callng of commented function ");
AutoprocsMain autoprocsMain = new AutoprocsMain();
System.out.println(" after making instance ");
//autoprocsMain.applyRules(customizedRateRequest);
catch(Exception e){
e.printStackTrace();
My Java Class:
package com.vsnl.pricing.dao.ARR;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;
import com.vsnl.pricing.dao.ARR.Base;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.log4j.Logger;
import org.drools.FactHandle;
import org.drools.RuleBase;
import org.drools.RuleBaseFactory;
import org.drools.WorkingMemory;
import org.drools.compiler.PackageBuilder;
import org.drools.rule.Package;
import org.springframework.context.ApplicationContext;
import com.vsnl.pricing.bizObjects.Customer;
import com.vsnl.pricing.bizObjects.RateRequest;
import com.vsnl.pricing.interfaces.ARR.IARRDAO;
import com.vsnl.util.VSNLLogger;
import com.vsnl.pricing.bizObjects.InnerObject;
import com.vsnl.pricing.bizObjects.CustomizedRateRequest;
public class AutoprocsMain extends Base{
private static Log log=LogFactory.getLog(AutoprocsMain.class);
private static Logger logger = Logger.getLogger(Invoker.class);
ApplicationContext ctx;
//ApplicationContext ctx;//=configure();
IARRDAO autoprocsDAO;//=(IAutoprocsDAO)ctx.getBean("autoProcDAOTarget");
public AutoprocsMain() {
System.out.println(" inside the Autoproc constructor");
//VSNLLogger.debug(logger, "before creatiom of CTX");
//System.out.println(" before creation of CTX ");
try{
//System.out.println(" inside the Autoproc constructor");
ApplicationContext ctx=configure();
autoprocsDAO=(IARRDAO)ctx.getBean("arrTarget");
catch(Exception e)
//VSNLLogger.error(logger, e.getMessage());
//VSNLLogger.debug(logger, "after creation of CTX");
//System.out.println(" after creation of CTX ");
public void applyRules(CustomizedRateRequest customizedRateRequest)throws Exception{
RateRequest rateRequest=new RateRequest();
List rateRequestObjs= new ArrayList();
List<CustomizedRateRequest> CustomizedRateRequestObjs=new ArrayList<CustomizedRateRequest>();
try{
//rateRequest= autoprocsDAO.getRecord();
rateRequestObjs=autoprocsDAO.getAllRateRequests();
//VSNLLogger.debug(logger, " AFTER THE CALL OF getAllRateRequests() function ");
CustomizedRateRequestObjs=autoprocsDAO.getCustomizedObjects(rateRequestObjs);
catch(Exception e)
//VSNLLogger.error(logger, e.getMessage());
RuleBase ruleBase=readRule();
WorkingMemory workingMemory = ruleBase.newStatefulSession();
FactHandle handle =workingMemory.insert(customizedRateRequest);
//customizedRateRequest.setContinueRule("1");
workingMemory.fireAllRules();
if(CustomizedRateRequestObjs.size()>0)
FactHandle handle =workingMemory.insert(CustomizedRateRequestObjs.get(0));
for(int i=0;i<CustomizedRateRequestObjs.size();i++)
CustomizedRateRequest customizedRateRequest=CustomizedRateRequestObjs.get(i);
customizedRateRequest.setContinueRule("1");
workingMemory.modifyInsert(handle,customizedRateRequest );
workingMemory.fireAllRules();
System.out.println(" after the firing of all rules ");
public static void main (String args[])
AutoprocsMain procsMain = new AutoprocsMain();
try{
procsMain.applyRules();
catch(Exception e)
e.printStackTrace();
private static RuleBase readRule() throws Exception {
System.out.println(" ****** inside readrule &&&& ");
//read in the source
Reader source = new InputStreamReader( AutoprocsMain.class.getResourceAsStream( "/Sample.drl" ) );
// Reader source1 = new InputStreamReader( AutoprocsMain.class.getResourceAsStream( "/com/vsnl/resources/Sample2.drl" ) );
//Reader source = new InputStreamReader( AutoprocsMain.class.getResourceAsStream( "/com/vsnl/resources/CustomerDiscount.drl" ) );
//optionally read in the DSL (if you are using it).
//Reader dsl = new InputStreamReader( DroolsTest.class.getResourceAsStream( "/mylang.dsl" ) );
//Use package builder to build up a rule package.
//An alternative lower level class called "DrlParser" can also be used...
System.out.println(" after package builder ");
PackageBuilder builder = new PackageBuilder();
System.out.println(" after package builder ");
//this wil parse and compile in one step
//NOTE: There are 2 methods here, the one argument one is for normal DRL.
builder.addPackageFromDrl( source );
System.out.println(" after add package source");
//builder.addPackageFromDrl(source1);
System.out.println(" after add package source1");
//Use the following instead of above if you are using a DSL:
//builder.addPackageFromDrl( source, dsl );
//get the compiled package (which is serializable)
Package pkg = builder.getPackage();
System.out.println(" after get package ");
//add the package to a rulebase (deploy the rule package).
RuleBase ruleBase = RuleBaseFactory.newRuleBase();
ruleBase.addPackage( pkg );
System.out.println(" end of read rule function");
return ruleBase;
public IARRDAO retBean()
return null;
}

Hi i am new to EJB .
please explain me the problem ..and kindly tell me to how to add this in classpath. I am using webSphere application server.
I added this in the classpath in the startup script.
I also added all the required jars in the EAR libraries ( I am using the RAD IDE).
Please help.

How can I call a java class from within my program?

I was wondering if there's a platform independent way to call a java class from my program.

Here's my scenario. I'm working on a platform independent, feature rich, object-oriented command prompt program. The way I'm designing it is that users can drop classes they write into my bin directory and gain access to the class through my program. For example, they drop a class named Network.class in the bin directory. They would type Network network at my command prompt and gain access to all the methods available in that class. They can then type system.echo network.ipaddress() at my prompt and get the system's ip address. I have it designed that there's a server running in the background and the clients connect to my port. Once connected the end-user can enter their user name and password and gain access to the system. When they type a command they actually call another java program which connects to my server using a seperate thread. They can then communicate back and forth. I have it set that everything has a process id and it's used to keep track of who called what program. Once the program is done it disconnects and closes. Rather than getting into the nitty gritty (I didn't want to get into heavy detail, I know how everything will work) I'm really interested in finding out how I can call a java program from my program. I don't want it to be part of the app in any way.

How to call a Java class from another java class ??

Hi ..... can somebody plz tell me
How to call a Java Class from another Java Class assuming both in the same Package??
I want to call the entire Java Class (not any specific method only........I want all the functionalities of that class)
Please provide me some slotuions!!
Waiting for some fast replies!!
Regards
Smita Mohanty

Hi Smita,
you just need to create an object of that class,thats it. Then you will be able to execute each and every method.
e.g.
you have developed A.java and B.java, both are in same package.
in implementaion of B.java
class B
            A obj = new A();
             //to access A's methods
             A.method();
            // to access A's variable
            //either
           A.variable= value.
           //or
           A.setvariable() or A.getvariable()

I want to call External Java class from the PL/SQL

Hi,
I am using Oracle Apps R11i (11.5.7), I wanted to call external Java class from the PL/SQL. This external Java class is residing in another application server.
How do I do this.
I know one way. Develop C routine in Oracle Apps to call external java class and call this C routine from the PL/SQL.
Is there any simple method available? or any other method?
Thanks in advance.
-Venkat

First of all, this is a Java application you're talking about, right (i.e. it has a main() function)? It's not just a class that you're trying to instantiate is it? If it's an application, you obviously have to start a new virtual machine to run it (rather than using the virtual machine built into the database like stored java). I'm a little leary of your mention of an "application server" as this would more commonly mean that a virtual machine is already over there running with access to this class. In which case, you'd typically interface with SOAP or some other RPC API.
All that aside, as long as you have physical disc access (through NFS or whatever) to the class file, you could use a java wrapper class with a system call to do this. In fact, there is a thread in just the last day or so on this very forum that has the code to do just that (see " Invoking OS Commands from PL/SQL"). However, it's worth noting that the virtual machine will be running on the database server in this case and not the application server.

In terms of scalabilty, will static method in normal java class better than

You only have one copy of the static method in memory, but you have a few copy of the stateless session bean, plus the overhead of those session bean.So isn't static method of normal java class more scalable than stateless session bean.

Then you have to take care of transaction management, connection pooling, etc other ejb services all by your self.
In fact stateless session beans acts more like a static class. They do not get destroyed when remove() method is called on client stub. Similarly they are not always gets created whenever someone calls create() method on home interface!! (Again it's specific to appserver implementation)
Thx.

How to read static variable defined java class from flex?

This is a beginner question. If I use remoteClass to map a java class and a flex class, how can I access a static variable defined in java class from the flex code?
Thanks!

Static propeties are by default ignored in the blazeds for serialization. You can try using another global property in the java bean which maps to the value stored in the static property( Hopefully it should work)
eg,
public String instanceValue = ClassName.staticValue;
Ref: http://livedocs.adobe.com/blazeds/1/blazeds_devguide/help.html?content=serialize_data_3.ht ml

Is there an easy way to call a java class from an applet?

Does anyone know of an easy way to call a server based java class from an applet? Has anyone done it or came across it? If yes how/where?
Cheers, Chris.

I'm not sure about the issue. Are you talking about "servelets"? "RMI"? Take a look at those issues.

How do I call a simple java class from a bpel process?

Hi.
In JDeveloper 10.1.4.3.0 I've created a simple java class that does an ftp get operation followed by an unzip. The class uses some 3rd part libraries (jars).
I want to use a simple bpel process to schedule a daily execution of this java class, and deploy it all to our SOA-server, - and was looking into using the <bpelx:exec> function.
The java class and the bpel process is all stored in the same JDeveloper project.
How do I put this together so that both my java class and the necessary jars are available to the bpel process?
I've looked into the JavaExecSample.bpel, and it's says something about "...the class com.otn.samples.javaexec.CreditCalculator is locally packaged with this BPEL process".
How do I do that?
Can I make it and test it all locally from my workstation (only JDeveloper installed, I guess there's nothing that can execute the bpel code?), or do I have to compile class etc (make war-file?) and deploy to SOA server (BPEL-INF/lib or classes?) before anything can be tested?
(I guess all this is simple, once you know how, but being a newbie to this I need a shove in the right direction :-)
Regards,
-Haakon-

To create a java class and dependent jars inside the BPEL process project you need to do the following:
1. Right click on your BPEL process project and select New and then Java Class from the Items.
2. Make the BPEL process project, JDeveloper would compile the java classes and add them into the BPEL suite case jar, see the output folder and check the BPEL suite case jar file for java classes and dependent jars.
You can test your Java classes from JDeveloper IDE, no need to deploy the classes on SOA server. When you make the BPEL project it compiles .bpel files and Java classes. You can test your classes once .bpel file and java classes compiled successfully.
Regards,
Dharmendra
http://soa-howto.blogspot.com

Calling a Java Class from PL/SQL

Hai,
I need a technique of calling a class file and invoke its
methods written in Java by PL/SQL for my intranet development.
PLease let me know if you have really experienced and won.
Thanks
JOhnson

First, to call a Java class from PL/SQL the class needs to be
deployed to the database. you can check the 8i documentation for
the instructions for loading Java into the database(LoadJava).
The document contains information on how to load the Java and
call it from PL/SQL. The following links should help.
Loading Java:
http://otn.oracle.com/docs/products/oracle8i/doc_library/817_doc/
java.817/a83728/03write6.htm
Invoking a Java Method in the database:
http://otn.oracle.com/docs/products/oracle8i/doc_library/817_doc/
java.817/a83728/04jserv2.htm
Gary (JDev Team)

Error Invoking Java class from Stored proc

We are getting this error while calling a stored procedure that invokes a
static function of a java class from inside Oracle 8.1.7.
ORA-29516: Aurora assertion failure: Java thread deadlock detected
ORA-06512: at "APPS.SERVICECONSUMERINVOKE", line 0
ORA-06512: at line 40
In a Toad SQL Window, when I execute the stored procedure that invokes the
java function, it executes successfully on the first attempt. When I try to
execute it again on the same SQL Window, it gives the above error. The java
class is part of a package and indirectly makes a JMS request-reply call
via other helper classes.
The same package works fine from other web containers and
unlike the Oracle JVM Aurora, the JVMs don't detect a deadlock.
Why does the Aurora throw an error?

Did you try issusing a commit and then trying again in Toad SQL Window?
The advice is to contact support:
ORA-29516: Aurora assertion failure: string
Cause: An internal error occurred in the Aurora module.
Action: Contact Oracle Worldwide Support.

Access a normal java class from EJB

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