Maybe I can clarify a bit. The reason the remoting client declares that it
throws Throwable is that remoting will pass along the Throwable object thrown
from the server side hanlder. Since we don't know what type of exceptions the
server side handler might throw, we have to declare the most generic base class
there is, which is Throwable.
So for example, suppose the user has an implementation of
ServerInvocationHandler that looks like:
| public class MyInvocationHandler implements ServerInvocationHandler
| {
| ...
|
| public Object invoke(InvocationRequest invocation) throws Throwable
| {
| Object param = invocation.getParameter();
| if("foo".equals(param)
| {
| throw new AssertionError();
| }
| else if("bar".equals(param)
| {
| throw new IllegalArgumentException();
| }
| else
| {
| return "Thank you";
| }
| }
|
| ...
| }
|
|
| |
| | So if the remoting client passes the String "foo" to the invoke()
method, an AssertionError will be thrown from the invoke() method call. If the
remoting client passes the String "bar" to the invoke() method, an
IllegalArgumentException will be thrown from the invoke() method call. Both
will appear just as it was thrown from the handler on the server side to the
client. Since there is no way for remoting to know what might possibly thrown
by the server handler, we have to just declare we throw Throwable.
| |
| | Now it is possible that an exception may occur that has nothing to do
with the server handler (i.e. a network error). So if the remoting client can
not connect to the server for some reason, remoting will throw a
org.jboss.remoting.CannotConnectException. If there was some other network
exception such as a socket timeout, would get that exception thrown as well
(i.e. java.net.SocketException).
| |
| | Hope that helps.
| |
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