https://bz.apache.org/bugzilla/show_bug.cgi?id=57891
Bug ID: 57891
Summary: UDPAppender stops to send if destination port is
unreachable
Product: Log4j
Version: 1.2.17
Hardware: Other
OS: Linux
Status: NEW
Severity: major
Priority: P2
Component: Appender
Assignee: [email protected]
Reporter: [email protected]
We use the org.apache.log4j.receivers.net.UDPAppender in the follwoing
scenario:
- the log4j extras lib is deployed in a tomcat
- messages are sent over UDP to a remote host
- the remote host runs grafana to record the UDP messages
What is the Problem:
- if we stop grafana, then the UDPAppender gets an IOException with a the
follwoing message: og4j:WARN Detected problem with UDP connection:
java.net.PortUnreachableException: ICMP Port Unreachable
- then the socket is set to null and the UDPAppender stops to send
- when we start grafana then we receive no messages anymore
In our case the UDPAppender shouldn't stop to send if the port of the remote
host is not reachable. And because the server is a production server which
sends the messages we are not able to restart the application everytime we
restart grafana.
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