Version 1.11.1 of SNMP4J included a fix for a race condition in
DefautlUdpTrasnportMapping which caused a NullPointerException.
However, there is still one that remains while attempting to read a
packet and I see this from time to time. Below is a patch that fixes
the problem for me that I'd like to submit for review.
Index: src/org/snmp4j/transport/DefaultUdpTransportMapping.java
===================================================================
--- src/org/snmp4j/transport/DefaultUdpTransportMapping.java (revision
215)
+++ src/org/snmp4j/transport/DefaultUdpTransportMapping.java (working
copy)
@@ -337,7 +337,11 @@
udpAddress.getPort());
try {
try {
- socket.receive(packet);
+ DatagramSocket readingSocket = socket;
+ if (readingSocket == null) {
+ continue;
+ }
+ readingSocket.receive(packet);
}
catch (InterruptedIOException iiox) {
if (iiox.bytesTransferred <= 0) {
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