Socket Programming in 7.2.2
I am trying to create a simple socket in PRPC by using the following java code in a function rule -
try {
Socket sock = new Socket("www.google.com", 80);
return "success";
} catch (java.io.IOException e) {
return "fail: "+e;
}
I have all the required imports in the library and the function compiles fine. But ultimately i get this exception: fail: java.net.ConnectException: Connection. refused: connect.... Does PRPC not allow creating sockets due to security policies? If so, is there a work around?
Accepted Solution
Pegasystems Inc.
GB
There is nothing as far as I know in PRPC that will stop you doing this; in fact I just tried (a slightly modified version of your code - I did this an Activity, rather than a function) this in PRPC722:
try {
java.net.Socket sock = new java.net.Socket("www.google.com", 80);
oLog.infoForced( "success" );
} catch (java.io.IOException e) {
oLog.infoForced(e);
}
And this logs 'success' in my logs.
If I mangle the hostname to 'googlex.com'; I get the expected response in the logs instead:
[...] Admin@Gcs - java.net.UnknownHostException: www.googlex.com
I'm using Tomcat here ; you might find that your App Server *is* blocking ports due to Security Policies etc; or it could be the JVM you are using - or indeed the Operating System itself.
NOTE: as you are probably already aware; although using Sockets directly like this will work - I'm not sure its a particularly something that is recommended here; wherever possible, try and use a PRPC 'Connector' to perform what you need to do here.
At the very least; consider using a higher level library; there are several Apache libraries included with PRPC OOTB; for instance "org.apache.commons.net.telnet.TelnetClient" might suit your needs here ?
Cognizant
IN
Hi PritJ
Thanks for that. How can I figure out that the App Server is blocking ports? Currently its a cloud environment and I am not sure how can i check the security policies of the server.
NOTE: as you are probably already aware; although using Sockets directly like this will work - I'm not sure its a particularly something that is recommended here; wherever possible, try and use a PRPC 'Connector' to perform what you need to do here. - Yes, I am aware about this and initially i tried to create a java connector but due to limited knowledge about the working of Java connectors, I was not confident about the approach. Can you share some good resources about Java connectors if possible?
Pegasystems Inc.
GB
Perhaps modify your test to do hit 'localhost:<port>' where '<port>' matches your PRPC App Server Port itself ?
This should eliminate a certain class of errors from your testing at least. (e.g. making sure 'www.google.com' is really the host you think it should be; and missing out any Firewall issues etc).