Snmp manager in java

Hello wise and helpful people!
I'm writting to get some very very important information for me.
Please read this post and answer as clearly as you can. I count on yours' kindness and understanding...
I have to write a java project for my studies.
It has to be a network devices' manager as an applet in java.
I can use some java Api to this task, so I searched java api in google.
Unfortunately my knowlegde about snmp and java is very weak, and I would like to ask you for help and answer some of my questions.
For example, I found AdventNet SNMP API 4, which seemd to be very suitable for me. Unfortunately, I read: "Due to the Java security restrictions, applets cannot directly communicate with SNMP agents. To overcome this, the SAS server can be used as a gateway between the applet (SAS client) and the agent." somewhere on this site " (http://snmp.adventnet.com/help/snmpapi/snmpv3/api_overview/sasapiarch.html)
What's the problem SAS server is only in the not-free package of advanet and so I can't afford it.
Do I understand well: Java applets cannot communicate via UDP with network devices, and there is no possibility to do so. It is necessary to have some server which translates TCP java commands into UDP SNMP commands?
Do You know some suitable and FREE sollution for my project?
It there any possibility to have java library, which would directly communicate with eg. router? Or do I have to have some serwer which will be some kind of "mediator" between java applet and network device? If yes, do you know some pair of library-serwer which is free?
I was searching on this forum with no positive effects for me, so I wrote this post.
Sorry for my English ;)
Please explain me this... I need you help!
Thanks,
David

if the applet is signed, it can do what you want. You may want to look at JMX. http://java.sun.com/products/JavaManagement/

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I am writing a SNMP Manager that is supposed to do the following:
(1) Send snmp commands to snmp-agents, and handle thier response.
(2) receive snmp traps from snmp-agents.
I am using SNMP4J software package for writing the snmp manager.
I would like to use a SINGLE Snmp object (SNMP4J object) , both
for sending a snmp command and for receiving snmp traps.
SO far, I have written two separate programs:
*** Program 1:
** The first program only listens for Snmp trap-PDUs.
** Its main code is as follows:
     // configure Snmp object
     UdpAddress address = new UdpAddress("127.0.0.1/1990");
     TransportMapping transport = new DefaultUdpTransportMapping(address);
     Snmp snmp = new Snmp(transport);
     transport.listen();
     // handle received traps here
     CommandResponder trapPrinter = new CommandResponder() {
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               PDU command = e.getPdu();
               if (command != null) {
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*** Program 2:
** The second program sends GET PDUs, and its main code is as follows:
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     UdpAddress targetAddress = new UdpAddress("127.0.0.1/1985");
     CommunityTarget target = new CommunityTarget();
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     command.add(new VariableBinding(new OID("1.3.6.1.4.1.1331.11.5.1.0")));
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I would like to unite these two programs into one, however, I cannot seem to
properly allocate one Snmp object to handle both the sending and receiving of PDUs.
I run two threads: thread-1 that does the listening for snmp traps,
and thread-2 which in charge of sending get/set PDUs.
I allocate the Snmp object in one place as follows:
     TransportMapping transport = new DefaultUdpTransportMapping(new UdpAddress("127.0.0.1/1990"));
     Snmp snmp = new Snmp(transport);
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and I transfer it to both threads to be used there.
However, thread-2 sometimes fails to send PDUs using snmp.send(...);
What am I doing wrong?
Can anyone guide me as for how I should allocate the Snmp object so
it is good for both sending PDUs, and for receving traps?
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