Using InputStream on EJB method

Hi everyone,
i was looking for a way to use InputStream or anything else related to the java.io package on my EJB method. This is the first time that i need to do something like that, so i made a research and i figure out that is impossible use any kind of the io package when i using EJB. Is that true?...
if this is true, could anyone help me how i can save something on my server using EJB?
Thanks in Advance

hi,
i looked in some forums, and talk with some people who use EJB for so long, and all answers took me to the conclusion that is totally not recommended using streams on ejb methods...i haven't looked on ejb specification to really see if its true...
Besides, i tried in other way..... first i created my EJB method with a byte[] parameter, and a "service" class which convert this array to an InputStream..and record the file on server...i did a client to test and apparently works without errors, i don't receive any exceptions, so i suppose that at least this part is correct, but i having another problem....
by the way, anyone know how can i save a certificate on a Keystore??...i'm trying that:
keyStore = manager.getKeystore("DEFAULT");
keyStore.load(is, password.toCharArray()); attempting that "is" is the InputStream (same of the problem above) and the second parameter is the password....this code belongs to a method on the "service class" that i mentioned before....
but nothing happens when i run my app. anyone could help me??
Thanks in Advance

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Thanks in advanced.

Thanks for reply Ravi.
The NullPointerException is beacuse of JNDI problem,we resolved that issue.We are able to create the ejb instance but with that instance when we are trying to call ejb method,we are getting the below error in console and the BPM instance is not getting created.
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Caused by: BPM-70204
Exception
exception.70204.type: error
exception.70204.severity: 2
exception.70204.name: Error creating process instance.
exception.70204.description: Error creating instance for target process default/ARCN!1.0*/ARCN.
exception.70204.fix: Verify server log to find the problem cause.
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Thanks,
Narasimha

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Hi,
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1. I have a table 'FRIENDS', (in Oracle 10g database).
2. It has two columns, 'NAME' and 'CITY'. Both have datatype strings(varchar2).
3. Now from a JSP page, having two textfields, 'NAME' and 'CITY', I want to insert data into table 'FRIENDS'.
4. In between JSP and database is a Entity Bean(EJB 3.0) and a stateless session bean.
5. I am using JDev as editor.
Please provide me code ASAP or link with similar example.
Thank you.
Anurag

Hi,
I am also trying that scenario. So u can
Post the jsp form data to a Servlet which will act as a Controller.
In the servlet invoke the business method.
Similar kind of app is in www.roseindia.net
Hope this would help u.
Meanwhile if u get any optimal solution, pls post it.
Thanks,
Happy Java Coding.

Client remote Authentication using JAAS and EJB Access

Hi,
I have a problem using JAAS in combination with Sun One Appserver 8.1 and a java remote client trying to access an EJB. Here is the scenario:
I have implemented an EJB who's methods are protected through the deployment descriptor:
        <assembly-descriptor>
             <security-role>
                <description>role for clients outside of the server </description>
                <role-name>sedna</role-name>
              </security-role>
            <method-permission>
              <role-name>sedna</role-name>
              <method>
                <ejb-name>ServerInfoBean</ejb-name>
                <method-intf>Remote</method-intf>
                <method-name>*</method-name>
              </method>
            </method-permission>
            <method-permission>
              <unchecked/>
              <method>
                <ejb-name>ServerInfoBean</ejb-name>
                <method-name>getVersion</method-name>
              </method>
              <method>
                <ejb-name>ServerInfoBean</ejb-name>
                <method-name>create</method-name>
              </method>
            </method-permission>
        </assembly-descriptor>I've deployed the EJB in a jar file which was packed into an ear file of a bigger application. The role has been mapped to the admin Principal in the sun-ejb-jar.xml descriptor.
I can find the EJB, create it, and call the unchecked method getVersion and that works fine, so far so good.
But then I try to access another method which is protected and then I get this exception
org.omg.CORBA.NO_PERMISSION:   vmcid: 0x2000 minor code: 1806 completed: Maybe
        at com.sun.enterprise.iiop.POAProtocolMgr.mapException(POAProtocolMgr.java:179)
        at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:853)
        at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:137)
...I have to mention that I do make a login via the LoginContext. My jaas.config File has a reference to the com.sun.enterprise.security.auth.login.ClientPasswordLoginModule module.
After login (which works perfectly) I lookup the context with a corbaname url which - if I understood it right - ignores the Context.SECURITY_PRINCIPAL and Context.SECURITY_CREDENTIALS settings.
After that I make the calls to the EJB. And I am allways ANONYMOUS on the server side, which is definitely the problem. Because ANONYMOUS is not allowed to call the protected EJB Methods. But I made a jaas login in advance. So where am I making a mistake???
Am I doing something wrong?
Need help! Thx,
Stephan

Hi.
I understand correctly that you call Subject.doAs on
the client to call the remote EJB. I guess It isn't
right way.I had also a bad feeling about this, so I forget it. But anyway it wasn't working with or without using that doAs().
>
>
Subject contextSubject =
Subject.getSubject(AccessController.getContext());
contextSubject.getPrincipals();This code throws exceptions in the Appserver. Unfortunately they are catched somewhere so I'm unable to find out what was going wrong. But I guess, that these exceptions where security exceptions. Never the less thanks for the hint!
But I don't think that doing the check on the server side is the way I want to go because that is programmatically security and I want to use the declarative security which can be used through the deployment descriptor. If used correctly - and supposed I do not completely misunderstand the specification - then it should be possible to create an EJB that is protected via it's deployment descriptor and access it through the client only if the client has been authenticated through JAAS mechanisms. After successful authentication the principal should be accessible through the EJB context but not for security check, that should allready been done at this time.
Unfortunately I don't find any resource on the internet describing the scenario in such a detail that I can reproduce it. There are only very high level documentations and hints in forums.
Again, thanks for your effort,
Stephan

How am I able to use an injected EJB in a Managed Bean Constructor?

JSF 1.2
EJB 3.0
Glassfish v1
Summary:
Managed bean injected EJB is null when referencing EJB var in constructor.
Details:
In my managed bean, I have a constructor that tries to reference an injected EJB, such as:
public class CustomerBean implements Serializable {
@EJB private CustomerSessionRemote customerSessionRemote;
public CustomerBean() {
List<CustomerRow> results = customerSessionRemote.getCustomerList();
}The call within the constructor to customerSessionRemote is null - I've double checked this in Netbeans 5.5.
How am I able to use an injected EJB in a Managed Bean Constructor?
Thanks,
--Todd

OK, I was reading the article Web Tier to Go With Java EE 5: A Look at Resource Injection and I understand your statement too.
Is there any way possible to Inject the EJB prior to the bean instance creation at all?
Maybe, I need to approach it with the old fashion Java EE 1.4 route and using JNDI in the PostConstruct annotated method to reference the EJB in the managed bean.
This had to been thought out before, I don't understand why a manged bean's life cycle places any injections at the end of the bean creation.
Also, now that I understand that the @PostConstruct annotated method will be called by the container after the bean has been constructed and before any business methods of the bean are executed.
I am trying to reference my EJB as part of the creation of the managed bean.
What happens: the JSF page loads the managed bean and I need to populate a listbox component with data from an EJB.
When I try to make the call to the EJB in the listbox setter method, the EJB reference is null.
Now, I'm not for sure if the @PostConstruct annotation is going to work... hmmmm.
** Figured it out. ** I just needed to move the EJB logic that was still in the setter of the component I wanted to populate into the annotated PostConstruct method.

Can't fill ByteArray in EJB-Method with generated Model-Class from WD-Model

Hello everybody,
i try to call an ejb-method with data from an FileUpload-UI-Element in WD. The EJB-Method is receiving the byte-data to create a document in KM via a Web-Service.
The ebj-methid has the following signature:
public FObject putFileDataSimple (byte [] btContent, String fullFileName, String username, String password)
After importing the Model and creating a context node i have the following structure:
Request_X_putFileDataSimple
+---btContent (Node)
      +-- item
+ fullFileName
+ username
+ password
btContent is of the generated Type Byte_Item, which is itself a generated Model-Class of modelClassType ARRAY
item is of Type byte
But i simply have problems to fill the context node (or the binded model-object). i tried different ways and looked at thread [https://www.sdn.sap.com/irj/scn/thread?messageID=1954223] but i cant get it work.
So my Method in WD looks like this to fill the structure and start the ejb-method:
public boolean putKMDataSimple( com.sap.tc.webdynpro.services.sal.datatransport.api.IWDResource fin ) {
try
wdContext.currentRequest_X_putFileDataSimpleElement().setFullFileName("abc");
wdContext.currentRequest_X_putFileDataSimpleElement().setUsername("def");
wdContext.currentRequest_X_putFileDataSimpleElement().setPassword("xxx");
byte[] buffer = new byte[1];
InputStream in = fin.read(false);
int i = 1;
int j = 0;
while (i!=-1)
     i = in.read(buffer);
     if (i!=-1)
       Byte_Item bi = new Byte_Item(mAlf);     // mAlf ist global defined Model-Class-Instance
       bi.setItem(buffer[0]);
        wdContext.currentRequest_X_putFileDataSimpleElement().modelObject().addBtContent(bi);
wdContext.currentRequest_X_putFileDataSimpleElement().modelObject().execute();
Doing this results in Error-Messages like:
Model-Object is not a complex type for every byte added this way.
And finally an IllegalArgumentException at java.lang.reflect.Array.set(Native Method)
The second way i tried is:
public boolean putKMDataSimple( com.sap.tc.webdynpro.services.sal.datatransport.api.IWDResource fin ) {
try
wdContext.currentRequest_X_putFileDataSimpleElement().setFullFileName("abc");
wdContext.currentRequest_X_putFileDataSimpleElement().setUsername("def");
wdContext.currentRequest_X_putFileDataSimpleElement().setPassword("xxx");
byte[] buffer = new byte[1];
ArrayList<Byte> btlist = new ArrayList<Byte>();
InputStream in = fin.read(false);
int i = 1;
int j = 0;
while (i!=-1)
     i = in.read(buffer);
     if (i!=-1)
          btList.add(buffer[0]);
wdContext.currentRequest_X_putFileDataSimpleElement().modelObject().setBtContent(btList);
wdContext.currentRequest_X_putFileDataSimpleElement().modelObject().execute();
Trying so results in:
java.lang.ClassCastException: class java.lang.Byte:null incompatible with interface com.sap.tc.cmi.model.ICMIModelClass:library:com.sap.tc.cmi(at-sign)[email protected]@alive
whenn calling the setBtContent Method
I don't what to do now to fill the context/model-object the right way.
Any helpfull hints are very welcome
Edited by: Matthias Hayk on Dec 1, 2008 5:51 PM
Edited by: Matthias Hayk on Dec 2, 2008 10:56 AM

Ok Vesselin and thanx for your idea,
so i adapted the source in the way you told like the following:
                 ArrayList<Byte_Item> btlist = new ArrayList<Byte_Item>();
                 byte[] buffer = new byte[1];
                 InputStream in = fin.read(false);
                 int i = 1;
                 int j = 0;
                 while (i!=-1)
                      i = in.read(buffer);
                      if (i!=-1)
                           // Byte gelesen
                           Byte_Item bi = new Byte_Item(mAlf);
                           bi.setItem(buffer[0]);
                           btlist.add(bi);
                           j++;
                 wdContext.currentRequest_X_putFileDataSimpleElement().modelObject().setBtContent(btlist);
                 wdContext.currentRequest_X_putFileDataSimpleElement().modelObject().execute();
This results also in the following Exception when exceuting the WS-proxy:
execute
[EXCEPTION]
java.lang.IllegalArgumentException
at java.lang.reflect.Array.set(Native Method)
at com.sap.tc.webdynpro.model.ejb.model.EJBGenericModelClassExecutable.getInputParameters(EJBGenericModelClassExecutable.java:215)
at com.sap.tc.webdynpro.model.ejb.model.EJBGenericModelClassExecutable.execute(EJBGenericModelClassExecutable.java:112)

Do i have to use JNDI with EJBS?

Hi
I want to use JNDI to lookup a system which i will send messages to using JMS. I would like to have some java classes on Tomcat to do the job. But...whenever i hear about JNDI it is always in relation to EJBs. Can i only use JNDI with EJBS?
If i can use JNDI is there anything important i need to know about.
Thanks in advance!
San H.

You can definitely use JNDI outside of EJB's - in particular, it's a great interface for dealing with LDAP servers, even securely, and can also be used for DNS interfacing, COS, RMI registries, etc.
While JNDI was chosen as the method by which J2EE components can locate other components in a distributed environment, it's by no means limited to that task :) It's a wonderful API, and in terms of things you need to know, most everything is covered fairly well at the JNDI tutorial in the various trails that are mapped out there.
http://java.sun.com/products/jndi/tutorial/
Good luck!
James
James Manning | Principal Engineer
Porivo Technologies, Inc.
919.806.0566 | [email protected]
http://www.porivo.com/
Measuring end-to-end Web performance.
Register for a FREE Performance appraisal:
http://www.porivo.com/peerReview/eval.html

Transaction Isolation Level for EJB methods

L.S.
I just found out the in OC4J one can not set the transaction isolation level on ejb methods. Moreover one needs to revert to bean managed transaction (manual coding of the ALL transaction logic) to set the isolation level.
On entity beans one can only set the isolation level for the whole bean (not on individual methods), and in session beans there is no way at all to set the isolation level.
This is on shear contract to all other application servers I used before (there one can declaratively set the isolation level for a ejb method, both in session and in entitybean deployment descriptors)
Is it foreseen in a future release to include such a valuable feature will be provided by oc4j?
Note that I was VERY surprised that OC4J could not handle this (I checked the j2ee spec, but admittedly the spec is a little vague about this support and makes it vendor dependent. the j2ee spec does not mandate this, except for CMP entity beans, but includes some suggestions on this ability. But most other application servers implemented the ability)
Regadrs,
Erik

Hello Erik --
I think we met in Perth recently?
Anyway, your information is correct.
We can set the transaction isolation level for each entity bean, at the bean level. We don't have for the specification of method level isolation settings -- I'd be interested to hear how you would like/do use this. What behaviour do you expect to see when a transaction is started that spans multiple methods on a bean with different declared isolation levels.
For session beans, we do not currently have the ability to declaratively specify the isolation level to use for the bean. I know this is not in the forthcoming 904 release, and will to check what is beyond that.
As you point out, this can be done programatically using the Connection.setIsolationLevel() method on any connections you are using from within the session bean.
I'd would like to log an enhancement request for you for this functionality. Can you send me an email at [email protected] and we'll take it offline.
-steve-

EJB method parameters are sent but nulls are received

My client calls my EJB method passing two serializable objects as parameters.
Using print statements and a network snoop I have confirmed that:
- the client is calling the method with valid objects
- from examining the data it appears that the objects are being serialized and sent across the network
- the EJB seems to receive null values.
I have deployed the EJB to both 9iAS and a standalone instance of OC4J with exactly the same results.
Any ideas?

Hi Dale and Kamesh,
No error messages? Nothing in the log files? Have you tried running OC4J in debug mode? In case you haven't already seen it, this "Technical Note" has more details.
Pardon me if I am stating the obvious, but it seems like there is a deserialization problem. Are the client JVM and server JVM both the same version? Have you implemented custom [de]serialization for the parameter classes? Is the same version of the parameter class files located both at the client and at the server?
Good Luck,
Avi.

Using the Process.getOutputStream() method

Hi all,
i have written a java program that executes System commands and returns output...
this program works fine if you want to only execute the command and returns output...
but suppose that the program that you executed waits for you to input something before returning ouput?!!
i suppose i have to use the Process.getOutputStraem() method in my prog!
but i don't know how to do that :-(
can any one help me to refine the prog to handle this case !
thanks a lot
here is the code:
import java.util.*;
import java.io.*;
class StreamGobbler extends Thread
    InputStream is;
    String type;
    OutputStream os;
    StreamGobbler(InputStream is, String type)
        this(is, type, null);
    StreamGobbler(InputStream is, String type, OutputStream redirect)
        this.is = is;
        this.type = type;
        this.os = redirect;
    public void run()
        try
            PrintWriter pw = null;
            if (os != null)
                pw = new PrintWriter(os);
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            String line=null;
            while ( (line = br.readLine()) != null)
                if (pw != null)
                    pw.println(line);
                System.out.println(type + ">" + line);
            if (pw != null)
                pw.flush();
        } catch (IOException ioe)
            ioe.printStackTrace();
public class GoodWinRedirect
    public static void main(String args[])
        if (args.length < 1)
            System.out.println("USAGE java GoodWinRedirect <outputfile>");
            System.exit(1);
        try
            FileOutputStream fos = new FileOutputStream(args[0]);
            Runtime rt = Runtime.getRuntime();
            Process proc = rt.exec("java jecho 'Hello World'");
            // any error message?
            StreamGobbler errorGobbler = new
                StreamGobbler(proc.getErrorStream(), "ERROR");
            // any output?
            StreamGobbler outputGobbler = new
                StreamGobbler(proc.getInputStream(), "OUTPUT", fos);
            // kick them off
            errorGobbler.start();
            outputGobbler.start();
            // any error???
            int exitVal = proc.waitFor();
            System.out.println("ExitValue: " + exitVal);
            fos.flush();
            fos.close();
        } catch (Throwable t)
            t.printStackTrace();
}

it's true that i've copied it and pasted it...
but i do understand how it works (really)
the article mentioned at last that we could send input
to the Program by invoking getoutputStream
i guess that we should write a construtor for the
streamGobbler class but this time using a
OutputStreamReader and may be doing sth elseThe "Gobbler" is there to eat up whatever bytes become available on an InputStream (from the program's output). I don't think ou just want to try to use the same class to handle the program's input.
The Gobbler can be used for eating up whatever comes out of any program--it' general, and doesn't rely on any particular output from the program (input to the Gobler). This is not the case for whatever writes to the program's input. You'll need to write what the program expects in the proper order.

When to Use Servlet only, EJB only and, both Servlet And EJB???

I have a question, If I want to build a Web application. Sometime i found that there is no need to use EJB as Servlet already provide that functionality.
Can anyone tell me when do I use Pure Servlet? When do I use Pure EJB and, When do I use Both EJB and Servlet???
I am very interesting in it.
Thanks.
Jack

EJB and servlets are two different things. Trying to compare them doesn't really make sense. A web application is always going to need some way to process Http requests and this in Java is done accomplished through Servlets (or jsp pages which in turn also use servlets).
EJBs are the basis of distributed cross-platform objects. They are handled through name services and stored in databases. An Entity Bean can be "brought back to life" as long as it's info is stored in a database. Regardless of a server being restarted. All this database support behind an Entity Bean (transactions, queries etc.) are very transparent to the programmer. They are provided by the EJB vendor.
The class properties of a Servlet (or class-level member variables) are shared among all requests (running thread instances of the service method). That's why they should be used with a lot of caution. This feature can be very useful but if used improperly can also be very vulnerable to security and synchronization issues.
I'm not an EJB expert but this explanation should give you some idea of what EJBs are all about.

JCOM EJB method parameter

Hi,
I want to call into an EJB using JCOM and I had a look at BEA's JCOM examples.
Are there any restrictions on the parameter and result types the EJBs methods
have, or can you use any serializable java type? Because interface Account uses
only double parameters and return values. I want to return classes generated by
corba IDLJ.
Thanks,
Juergen

Juergen Weber wrote:
Hi,
I want to call into an EJB using JCOM and I had a look at BEA's JCOM examples.
Are there any restrictions on the parameter and result types the EJBs methods
have, or can you use any serializable java type? Because interface Account uses
only double parameters and return values. I want to return classes generated by
corba IDLJ.jCOM is quite restrictive for pass by value IMHO (restricted by COM
struct limitations). You can read about those restrictions here:
http://j-integra.intrinsyc.com/j-integra/doc/
If you don't want to compromise your design I would recommend using
CORBA. You can use Tuxedo C++ (or any other C++ ORB, but with Tuxedo you
get a free licence for the client I believe when you purchase WLS) and
then ATL to expose that over COM. Note that does require a reasonable
degree of skill to implement (e.g. knowledge of CORBA, ATL/Visual C++ etc.)
An alternative CORBA client that is excellent for COM interop is Borland
Janeva which I have been using quite a lot recently. Version 6 includes
a number of COM interop enhancements. It does require the .NET runtime
on the client however which might not be acceptable for your environment
of course. It is extremely easy to use however, and requires very little
knowledge beyond that which a competent J2EE developer will have.
Robert

Is it legal to use Vector in EJB?

Chapter 24 of the EJB spec states:
"An enterprise Bean must not use thread synchronization primitives to synchronize execution of multiple instances."
As far as I know Vector ist thread save.
Does this mean you must not use Vector in EJB? Or is it allowed to use Vector as only one bean instance accesses one Vector instance?

I'd sure like to hear a clear answer to this question. I've been tasked with adding an EJB interface to an existing server application. Right now, we have 2 main methods of sending requests to the server, RMI and IP. We have clients that are requesting an EJB interface. What I'd like to do is create a Session bean( haven't decided on Stateless or Stateful yet ) that invokes the same underlying objects that the RMI and IP objects use. However, those classes were not written with EJB's in mind. They start threads. They access files. They have static data which is manipulated. All those things are forbidden( or at least, strongly discouraged ) in the EJB spec, as I understand it.
Of course, I could create a Session bean that used the existing RMI or IP interface to talk to an instance of our application running in a different JVM, which would eliminate the problem. But that seems like a bit of a hack to me.
Marc Robertson
Staff Consultant
DST Systems, Inc.

HELP - ERROR INVOKING ENTITY EJB METHOD

Hi,
I keep getting a java.rmi.NoSuchObject exception when using my entity ejb, but cannot see why, as I already have the ejb in a collection... code & stack trace below: Any one know what is causing this ??
java.rmi.NoSuchObjectException: com.syntegra.cec.insurance.entity.AATreportPK@7a6c34
java.rmi.NoSuchObjectException: com.syntegra.cec.insurance.entity.AATreportPK@7a6c34 at AATreport_EntityBeanWrapper14.getPayment_reference(AATreport_EntityBeanWrapper14.java:1881) at com.syntegra.cec.insurance.dtofactory.RecordsDTOFactoryBean.fetchAAT(RecordsDTOFactoryBean.java:151) at com.syntegra.cec.insurance.dtofactory.RecordsDTOFactoryBean.fetchRecords(RecordsDTOFactoryBean.java:62) at RecordsDTOFactory_StatelessSessionBeanWrapper49.fetchRecords(RecordsDTOFactory_StatelessSessionBeanWrapper49.java:108)
HashMap records = new HashMap();
Collection theEJBs = null;
int counter = 0;
//Find the beans
AATreportHome home = (AATreportHome)lookUpHome
(com.syntegra.cec.insurance.entity.AATreportHome.class,
"AATreport");
theEJBs = home.findByStatus(type);
//Populate the DTO's
if(theEJBs != null)
Iterator it = theEJBs.iterator();
while(it.hasNext())
AATreport theEJB = (AATreport)it.next();
AATreportDTO theDTO = new AATreportDTO
----- This is where the error comes from --
---Line 151 ---(theEJB.getPayment_reference(),
theEJB.getTenant_ref_no(),
theEJB.getInsurance_no(),
theEJB.getName(),
theEJB.getAddress_line_1(),
theEJB.getPremium(),
getDateAsString(theEJB.getAction_date()));
records.put(new Integer(counter), theDTO);
counter++;

Greetings,
Hi,
I am trying to access a bean from a JSP and have the
foll. code piece:
<%
String op="";
try {
// Contact the AccountBean container (the "AccountHome") through JNDI.
Context ctx = getInitialContext();
out.println("initial context got !!");
DemoHome home = (DemoHome) ctx.lookup("demo.DemoHome");
out.println("home got !!");Though it doesn't seem to be the problem in this case, good EJB coding practices dictate that your code should be narrowing the home reference before calling any of it's methods (i.e. create(...) )... WebLogic may allow handling of its protocol objects in their native state, but other vendors do not... your application is not portable without narrowing.
It gives an error on trying to access the method "demoSelect".
e.printStackTrace gives the output:
java.lang.RuntimeException: javax.ejb.EJBContext.getEnvironment is deprecated inThe error is not in your JSP, but in the bean... it seems your bean is attempting to acquire its "environment properties" in the pre-1.1 style, when...
EJB 1.1. EJB 1.1 compliant containers are not required to implement this
method. Use java:comp/env instead. ...instead, it should be looking them up in its JNDI namespace.
What is wrong???
pls help! Regards,
Tony "Vee Schade" Cook

Using InputStream on EJB method

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