RMI被禁用，Java仍在侦听端口1099

Question

When I execute netstat -tupan , one of the entries is the following:

tcp        0      0 :::1099  :::*         LISTEN      8778/java

However, I have removed all settings concerning RMI and JMX from the options passed to Java when it starts. My questions are:

1. Is RMI actually still enabled? I can connect to the port using telnet.
2. If not, why does Java still listen on the port?

Edit: I blocked the port using netcat: nc -l 1099 . This prompted an error on the application startup, and it turns out that I have an MBean in the application which was automatically picked up by Spring on startup and registered.

Answer 1

Here is the steps to trace the issue:

1. Stop your application
2. Run another application which listened on port 1099
3. Start your application again
4. java.net.BindException: Address already in use exception is thrown by the class that tries to listen on port 1099.

You can work on the issue based on the clue.