How to catch "Unable to sendViaPost to url"?

Question 1

Looking at the stack trace, I don't think you can catch it. Catching it would require that you own code somewhere in the Thread where the exception is being thrown.

Looking at the lowest stack in the trace shows this:

at java.lang.Thread.run(Thread.java:724)

To me this says that the exception is occurring in a thread most likely started by Axis. Because of this you can't catch it and show an error message.

If this is expected behavior, the best you can do is to configure your logging framework not to show INFOs from Axis. Be aware that this may mean you'll also miss more useful error messages as well.

All in all, I would focus on how to solve the "Unable to sendViaPost" from happening rather than suppressing the logging statement.

To answer your comment question: As you can see from the stack trace, the exception is not caught by any client code but is bubbled up to Thread itself. This is the stopping point for an Exception and where it stops. If you were going to catch it you'd have to have code in its call stack (which you don't, since when the thread is created by Axis a new call stack is created for the new thread Axis starts).

Read more here. The only difference in your case is that since the exception is not thrown on the main thread the program doesn't exit, but the thread where the exception occurs is terminated.

To sum it up: You have no code in the call stack and therefore cannot catch the exception. The only other option is to turn of INFO statements for Axis.

Question 2

If I am understanding the question properly you're attempting to catch something that is not the exception that is being thrown.

This:

HTTPSender - Unable to sendViaPost to url[http://127.0.0.1:8081/axis2/services/MYSERVICE1.MYSERVICE1HttpSoap12Endpoint/]

is what is being attempted. When it failed it's throwing a ConnectException.

Which you can simply catch with

try{
    //Code that Makes the Connection
}
catch (ConnectException e) 
{
    e.printStackTrace();//Or What ever your message may be
}

Without seeing some code it's impossible to give a definitive answer. But this likely will solve the problem.

One Caveat, if you do catch a ConnectException to suppress it, you could suppress when there actually is a problem that would also throw a ConnectException.

If this is happening when you are starting up the server you might want to check why this is happening before trying to suppress it.

If it's refusing the connection that you are attempting you might want to ensure where it is connecting to has an available socket to connect to.

Question 3

2014-02-24 13:02:31,258 [INFO] HTTPSender - Unable to sendViaPost to url[http://127.0.0.1:8081/axis2/services/MYSERVICE1.MYSERVICE1HttpSoap12Endpoint/]

Well, if you look closely, the message which you are trying to catch isn't an ERROR at all. It's an INFO log generated from HTTPSender. Only thing which you should catch in this entire stacktrace is java.net.ConnectException and check for message Connection refused.

You can make it easier for your clients though and provide a message, by wrapping the java.net.ConnectException with message Connection refused or throwing a custom exception with the original exception as the cause.

UPDATE

java.net.ConnectException is an elementary exception in network transactions. Generally standard libraries do not catch them unless there is something specific to be done.

In this case, if you are unable to catch hold of java.net.ConnectException, then you can look out to catch AxisFault thrown by org.apache.axis2.description.OutInAxisOperationClient.send.

Below snippet may be useful for you.

try {
    ...
} catch (RemoteException ex) {
    if(ex instanceof AxisFault){
        logger.error("Axis Fault error: " + ((AxisFault)ex).getFaultString());
        throw new CustomExcpetion(" Custom Message ");
    }
}

Also note that AxisFault is a subclass of java.rmi.RemoteException and this will not get caught when you use java.lang.Exception in a catch statement.

Shishir