Zabbix java_gateway java.rmi.ConnectException

[Matess]

Hi,
having problem to setup the java gateway.
Installed server and java gateway on same machine and getting this exception.

2012-07-12 15:24:51.637 [pool-1-thread-4] DEBUG com.zabbix.gateway.SocketProcessor - dispatched request to class com.zabbix.gateway.JMXItemChecker
2012-07-12 15:24:51.637 [pool-1-thread-4] DEBUG com.zabbix.gateway.JMXItemChecker - connecting to JMX agent at service:jmx:rmi:///jndi/rmi://plns00011:12345/jmxrmi
2012-07-12 15:24:51.686 [pool-1-thread-4] WARN com.zabbix.gateway.SocketProcessor - error processing request
com.zabbix.gateway.ZabbixException: java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is:
java.net.ConnectException: Connection refused
at com.zabbix.gateway.JMXItemChecker.getValues(JMXIte mChecker.java:100) ~[zabbix-java-gateway-2.0.1.jar:na]
at com.zabbix.gateway.SocketProcessor.run(SocketProce ssor.java:63) ~[zabbix-java-gateway-2.0.1.jar:na]
at java.util.concurrent.ThreadPoolExecutor.runWorker( ThreadPoolExecutor.java:1110) [na:1.6.0_24]
at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:603) [na:1.6.0_24]
at java.lang.Thread.run(Thread.java:679) [na:1.6.0_24]
Caused by: java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is:
java.net.ConnectException: Connection refused

[Matthias R]

I have the same problem here. One problem I see is that there seems to be no way to test whether the Java application is correctly set up. I mean, zabbix_get returns an empty line, no value. Telnet reports that the remote party closes the connection. First the java instance should do its job, but how can one test that?

Edit: When I first used Zapcat I got the expected results in telnet, but the Java gateway reported "Connection refused". I undeployed Zapcat because I guessed it won't work with Zabbix 2.0.1 and modified the Tomcat start script as explained in the manual. Now I get no results from neither telnet nor zabbix_get, and still Connection refused messages in the Java Gateway's log.

[Matthias R]

There is a firewall issue if you try to connect to a remote server: The server you are contacting opens an arbitrary port to communicate back. If there is a firewall in between or you are using ssh tunneling (as in my case) this won't work.

[Matthias R]

I added this issue to the bug tracker: https://support.zabbix.com/browse/ZBX-5326

[Matthias R]

If the software you are about to monitor is Tomcat in version 6.0.26 or newer, there is a fix for this problem, see Connecting to JMX on Tomcat 6 through a firewall

The appropriate catalina-jmx-remote.jar JAR file can be found at
http://archive.apache.org/dist/tomcat/tomcat-6/v<<version>>/bin/extras/

[Matthias R]

Here is a description of the workaround I figured out:

https://support.zabbix.com/browse/ZBX-5326?focusedCommentId=62570&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-62570