Zabbix is not monitoring WebSphere Application

[c.fabre]

1. Zabbix Version 1.9.4
1.1 Zabbix server is running on host 192.168.15.86. JMX configuration file: zabbix_server.conf:

JavaProxy=192.168.15.98
JavaProxyPort=10051
StartJavaPollers=5

2. Java Proxy is running on host 192.168.15.98, configuration file:
settings.sh:

PID_FILE="/tmp/zabbix_java.pid"

3. The JMX application is running on 192.168.15.98.

http://192.168.15.98:9080/PlantsByWebSphere/

4. GUI configuration:

Host interface:192.168.15.98:9080
Type:JMX agent
Key:jmx["java.lang:type=Memory","HeapMemoryUsage.used"]

Question: How do I enable remote JMX monitoring for a Java application on WAS - WebSphere Application Server? Zabbix is not monitoring the application.

Can anyone help me?

Thanks,
Cesar