Question

RemoteException:java.lang.reflect.InvocationTargetException

Asked by: praveen_bakare

I get the exception "RemoteException:java.lang.reflect.InvocationTargetException" at the client side when I invoke a function from the Web Service deployed on the server. The server function is invoked propery but when it reaches a place where it creates an instance of another class, then it returns this exception to the client.
   Can anyone please tell me the reason why we get this exception and if possible a way to remove it ?
  Thanks in advance.

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Asked On
2005-02-16 at 04:39:15ID21316683
Tags

java.lang.reflect.invocationtargetexception

,

remoteexception

,

invocationtargetexception

Topic

Java Programming Language

Participating Experts
7
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0
Comments
25

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Answers

 

by: dejanpazinPosted on 2005-02-16 at 06:19:50ID: 13324065



Do you have the print of exception on the server side?

 

by: ashok3sepPosted on 2005-02-16 at 06:38:05ID: 13324256

rt.jar - is the stands for run time :) it's the main library, which contains all classes from SDK.
ClassLoader - is the class, which loads classes from .class files.
in your case, you don't have JAXP package in your classpath (or even installed on system), so try to install it and add to your classpath

regards,

Freedom.

 

by: CEHJPosted on 2005-02-16 at 06:44:34ID: 13324323

?

 

by: mayankeaglePosted on 2005-02-16 at 07:43:22ID: 13325096

Wrong Q, I guess :)

 

by: ashok3sepPosted on 2005-02-16 at 07:48:17ID: 13325173

Sorry for my Posting.........

I posted wrongly..................

regards,
Freedom.

 

by: mayankeaglePosted on 2005-02-16 at 07:49:48ID: 13325201

>> The server function is invoked propery but when it reaches a place where it creates an instance of another class, then
>> it returns this exception to the client.

What happens in the construtcor of the other class?

 

by: MenritPosted on 2005-02-16 at 09:48:01ID: 13326625

This Exception is got because it tries to deal with the host using the hostname (for example "MyHostName ") not using the IP so as the hostname of the host you are trying to access remotely is not saved in the DNS it cannot be found by the application. so you get an error like the following :

[failed to localize] http.client.failed(java.net.UnknownHostException: MyHostName)

To solve the problem add an entry to the file /etc/hosts  as follows :
IP          MyHostName

 

by: praveen_bakarePosted on 2005-02-16 at 20:23:05ID: 13331536

dejanpazin,
      I dont get any print of the exception on the server side. Only the debug comment before the call to the other class constructor is printed. Nothing is printed after that. Only above exception at client side.
   

Menrit,
         Sorry dear, but I did not understand what u have said in your comment. I am doing server side coding and I just use the stubs created by wsdl2java tool. I have not dealt with anything related to HostName.

Mayankeagle,
        In the constructor of the other class I call the constructor of its super class (with diff signature).e.g.
        public ABC(PQR inst){
                super(inst.variable);
        }
Classes ABC and PQR are sub classes of class XYZ whose contructor has been called using the keyword "super".
Note that the signature of the superclass constructor is different. I hope that does not make any problem.  

 

by: mayankeaglePosted on 2005-02-16 at 22:03:49ID: 13331977

>> public ABC(PQR inst){
>>                super(inst.variable);
>>        }

Are you sure that 'inst' is not null?

 

by: bhaskar20001Posted on 2005-02-16 at 22:21:12ID: 13332032

I think this type of exception will come only when we use reflection to invoke a method or create an instance..
see around for the code where U r actually using reflection mechanism to do something where U r suspecting that this error is coming..

 

by: dejanpazinPosted on 2005-02-17 at 01:17:19ID: 13332874


Put the body of the method that you are calling on the server in a try-catch block, and print out the exception:

public void myWebServiceMethod(...)
{
try
{
  /// the body of the method goes here
}
catch (Exception e)
{
   e.printStackTrace();  
   // you can throw the exception here if you like, so the client will still get it
}
}

 

by: MenritPosted on 2005-02-20 at 00:26:29ID: 13356600

First are you using a linux client or a windows one?

At the client side, if you scroll down the Exception don't you find the next statement ?

[failed to localize] http.client.failed(java.net.UnknownHostException: MyHostName)

 

by: praveen_bakarePosted on 2005-02-21 at 02:13:34ID: 13361383

mayankeagle,
        I am sure that 'inst' is not null...

bhaskar20001,
        I dont know anything about the reflection mechanism. So cant really search for such code.. If u can guide me in this direction then it would be good.

dejanpazin,
        Sorry dear but I have done that previously only. All my code is in a try catch block. But to my surprise it does not print anything on the server side.

Menrit,
        I am using a Solaris Client to invoke a webservice deployed on a Solaris Server.
        Also, I dont find any such statement that u have mentioned above at the client side.

Hope this answers u all guys very well. Thanks for ur replies and please continue the same..

 

by: mayankeaglePosted on 2005-02-21 at 02:17:00ID: 13361400

>> Sorry dear but I have done that previously only. All my code is in a try catch block. But to my surprise it does not print
>> anything on the server side.

Are you re-throwing the exception again from the catch block? Have you printed e.getMessage () or called e.printStackTrace () in the catch block?

 

by: praveen_bakarePosted on 2005-02-21 at 02:23:16ID: 13361453

mayankeagle,
        I am re-throwing exception(but of different type which client can understand and act accordingly).
        Also, I have printed e.getMessage () , but it actually does not print anything as I said earlier.

 

by: mayankeaglePosted on 2005-02-21 at 02:25:33ID: 13361475

>>  I have printed e.getMessage () , but it actually does not print anything as I said earlier.

Is there any way that you can debug and see if control actually reaches the catch-block? Which types of exceptions are you catching? Try putting a generic Exception catch block too and see if it reaches there.

 

by: praveen_bakarePosted on 2005-02-21 at 02:32:02ID: 13361518

mayankeagle,
         I have inserted debug comment in the catch block but that comment is never printed.
         I only catch the generic Exception and no other exception.

 

by: mayankeaglePosted on 2005-02-21 at 02:34:48ID: 13361546

If it is never printed, then I guess it never reaches there. Can you post that catch block please? Is that method at the server being called?

 

by: praveen_bakarePosted on 2005-02-21 at 02:43:43ID: 13361583

Following the entire code of that function which is called from within the server function.

try
  {
    log.debug("getAttachDBConnection called");
    attachdb = new AttachmentDBConnector(databaseURL, sid, username, password, port);
   attachdb.makeConnection();
   attachdb.setAutoCommit(false);
  }
catch(Exception e)
  {
     log.error("Error connecting to the Database:"+e.getMessage());
     throw new AppRecovException("DB_CONN_ERROR","Error connecting to the Database:"+e.getMessage());
  }


Only the debug message "getAttachDBConnection called" is printed and then there is nothing in the logs.

 

by: mayankeaglePosted on 2005-02-21 at 02:47:50ID: 13361597

>> log.error("Error connecting to the Database:"+e.getMessage());

Where does this log it? Some file or DB? Can you check that? Or try changing it to log.debug () in the catch block too and see if something comes to console.

 

by: bhaskar20001Posted on 2005-02-21 at 03:05:11ID: 13361711

why don't U debug by keeping debug messages inbetween the statements of try block to see which statement is actually causing the problem..so that you can look in to that particulat statement only for the fix..
just like below..
is that
try
  {
    log.debug("getAttachDBConnection called");
    attachdb = new AttachmentDBConnector(databaseURL, sid, username, password, port);
    log.debug("getAttachDBConnection called1");
   attachdb.makeConnection();
    log.debug("getAttachDBConnection called2");
   attachdb.setAutoCommit(false);
    log.debug("getAttachDBConnection called3");
  }

does this method which has this code throwing any Exception in it's signature. like
public void myMethod()throws CreateException
{
}

 

by: praveen_bakarePosted on 2005-03-23 at 19:34:59ID: 13618565

I have found out the answer to this question.
The problem was that the AttachmentDBConnector was residing in two jar files. Whenever we make changes to the file we are supposed to change the file in both the jars. But somehow the change was not reflected in one of the jars. I have now created the jars using ANT and it works fine.
Thanks a lot everyone for their comments.
Moderator.. can u please refund my points back if possible ?
If that is not possible then can you please distribute these points among all of them who have contributed to this question ?
Thanks a lot in advance.

 

by: moduloPosted on 2005-04-10 at 07:29:32ID: 13747247

PAQed with points refunded (50)

modulo
Community Support Moderator

20120131-EE-VQP-002

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