E-COM-NET

Question

I'm developing collection of monitoring script and templates for zabbix. It's called ZTC and all script are on python.

Now I want to add support for some java monitoring. I've not found the way to do it from CPython - only from java or jython. Since all project is on python, I've decided to write a simple script on jython, which would be called from my cpython classes.

Here is how my code looks like:

#!/usr/bin/env jython

#Java Dependencies
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;
import java.lang.management.ManagementFactory;

#Python Dependencies
import sys, cmd, socket

def usage():
    print """Usage:
    jmxclient.py -h
    jmxclient.py <connect_url> <jmx_attribute_path> <jmx_property>"""

class JMXClient:
    remote = None

    def connect(self, connect_url):
        if self.remote:
            return True

        #Establish Connection to JMX Server
        url = javax.management.remote.JMXServiceURL(connect_url);
        connector = javax.management.remote.JMXConnectorFactory.connect(url);
        self.remote = connector.getMBeanServerConnection();

    def getAttribute(self, mbean_path, attribute):
        """Query the mbean server for a specific attribute and return the
        result"""
        obn =  javax.management.ObjectName(mbean_path);
        result = self.remote.getAttribute(obn, attribute);

        return result    

if len(sys.argv) <= 1:
    usage()
    sys.exit(2)

if sys.argv[1] in ('-h', '--help'):
    usage()
    sys.exit(2)

if len(sys.argv) <> 4:
    usage()
    sys.exit(2)

(connect_url, mbean_path, attribute) = sys.argv[1:]

j = JMXClient()
j.connect(connect_url)
print j.getAttribute(mbean_path, attribute)

Ok, now I'm trying to get some attribute from terracotta server. It uses jmxmp with url service:jmx:jmxmp://0.0.0.0:9520.

So, I'm running my script as follows:

$ ./jmxclient.py service:jmx:jmxmp://localhost:9520 java.lang.ClassLoading LoadedClassCount
Traceback (innermost last):
  File "./jmxclient.py", line 87, in ?
  File "./jmxclient.py", line 61, in connect
        at javax.management.remote.JMXConnectorFactory.newJMXConnector(JMXConnectorFactory.java:327)
        at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:247)
        at javax.management.remote.JMXConnectorFactory.connect(JMXConnectorFactory.java:207)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)

java.net.MalformedURLException: java.net.MalformedURLException: Unsupported protocol: jmxmp

(line numbers not relevant due to some stripped comments)

How do I add support of this jmxmp protocol?

I've found that it seems it might be enabled by jmxremote_optional.jar. How do I add this jar to my jython (pref. not system-wide)?

UPDATE:

As suggested, I've added jmxremote_optional.jar and jmxremote.jar from jmxremote-1_0_1-ri-bin-b58.zip reference implementation: jython -Djava.endorsed.dirs=. -Dpython.path=.../jmxremote_optional.jar:.../jmxremote.jar:.../jmissl.jar jmxclient.py service:jmx:jmxmp://localhost:9520 java.lang.ClassLoading LoadedClassCount, but still getting the same error. I'm sure that jmxremote_optional.jar is in classpath, and code seems to be very similar to reference examples.

After reading api docs, I've tried following changes:

url = javax.management.remote.JMXServiceURL('jmxmp', 'localhost', 9520);
connector = javax.management.remote.jmxmp.JMXMPConnector(url)
connector.connect()
self.remote = connector.getMBeanServerConnection();

which leads me to another exception:

Traceback (innermost last):
  File "../src/jmxclient.py", line 87, in ?
  File "../src/jmxclient.py", line 61, in connect
        at com.sun.jmx.remote.opt.security.AdminClient.connectionOpen(AdminClient.java:209)
        at com.sun.jmx.remote.generic.ClientSynchroMessageConnectionImpl.connect(ClientSynchroMessageConnectionImpl.java:72)
        at javax.management.remote.generic.GenericConnector.connect(GenericConnector.java:177)
        at javax.management.remote.jmxmp.JMXMPConnector.connect(JMXMPConnector.java:119)
        at javax.management.remote.generic.GenericConnector.connect(GenericConnector.java:124)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
java.io.IOException: java.io.IOException: javax.management.remote.message.HandshakeBeginMessage

Jython version is 2.2 and I don't like to use later version, because this scripts is mostly being used on RHEL5 boxes, and they only have jython 2.2.1.

PS: marking question as answered, because I've decided to give up and use jmxterm or similar tool, which all seems to work with jmxmp by just adding -Djava.endosed.dirs=/path/to/dir_with_jmxremote_optional/. But I'd still like to see jython solution.

score 5 · Accepted Answer

Man, I read that post about 7 times .....

Anyways, here's what I think is going on. The jmxmp protocol is not packaged in the standard J2SE runtime. See this page. To quote:

Note – If you want to use a JMXMP connector, download the JSR 160 Reference Implementation from http://java.sun.com/products/JavaManagement/download.html, and add the jmxremote_optional.jar file to your classpath. You will find examples of use of the JMXMP connectors in the JMX Remote API Tutorial included with the JSR 160 Reference Implementation.

I'm not that familiar with jython, but it looks like this post should hook you up.

jppf javax.management.remote.message.HandshakeBeginMessage

2 Answers

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