JMX: Invalid character '*' in key part of property

Question

Hi:
While trying to retrieve the model mbean attributes, I am seeing
the following exception --
javax.management.MalformedObjectNameException: Invalid character '*' in key part of property
at javax.management.ObjectName.construct(ObjectName.java:459)
at javax.management.ObjectName.<init>(ObjectName.java:1304)My ModelMBean extends the DefaultModelMBeanProvider class.
The mbean is registered correctly with the mbean server, i notice the succesful registration when i deploy the application to the application server.
The following code registers the mbean programmatically with the mbean server
ObjectName name = null;
name = new ObjectName(":type=myManager,name=myConfig");
// register MBean. It is registered under a domain
// named after the application that registered it
factory.registerMBean(name, <instance of the mbean class>)
Now, to retrieve the attributes of the mbean, I am querying for my MBean using the following API
ObjectName oname = SDKJMXUtil.queryName(mgmt, new ObjectName(appName+":type=myManager,name=myConfig, *"), null);
where
SDKJMXUtil.queryName(....) is ..
* Perform a JMX query for a single MBean and return the
* ObjectName of the MBean. <p> Throws an IASException if the
* query fails, or if conn is null, or if the number of mbeans
* returned in the query result is not one.
* @param conn JMXConnection used to perform query
* @param oname The ObjectName used in query
* @param exp The QueryExp used in query (can be null)
* @throws IASRuntimeException if there was an error querying the MBeans, or if 0 or multiple MBeans were found.
public static ObjectName queryName(JMXConnection conn, ObjectName oname, QueryExp exp)
Set objects;
try
objects = conn.queryNames(oname, exp);
catch (IOException e)
throw new IASRuntimeException("Error performing JMX query",
IASErr.class.getName(),
IASErrID.JMX_QUERY_ERROR,
e);
if (objects == null || objects.size() < 1)
throw new IASRuntimeException("MBean not found",
IASErr.class.getName(),
IASErrID.MBEAN_NOT_FOUND,
null);
else if (objects.size() > 1)
throw new IASRuntimeException("More than one MBean found",
IASErr.class.getName(),
IASErrID.TOO_MANY_MBEANS_FOUND,
null);
return (ObjectName)objects.iterator().next();
Please let me know why I am sesing the javax.management.MalformedObjectNameException: Invalid character '*' in key part of property exception.
Thanks much.
-NB.

Answer 1

Hi,
There's a forum dedicated to JMX - You can subscribe
to this JMX-FORUM from here: http://archives.java.sun.com
Concerning your question please see below:
Hi:
While trying to retrieve the model mbean attributes,
I am seeing
the following exception --
javax.management.MalformedObjectNameException:
Invalid character '*' in key part of property [...]
new ObjectName(appName+":type=myManager,name=myConfig, *")The problem is that's there is a white space ' ' between ',' and '*'.
There are no delimiter characters in JMX ObjectName ' ' has no
special meaning and isn't ignored - so ' *' is interpreted
as being a key containing a white space and a star. Star is a special character
which can't be part of a key, hence the MalformedObjectNameException.
Try with:
new ObjectName(appName+":type=myManager,name=myConfig,*")
and it should work.
Hope this helps,
-- daniel
http://blogs.sun.com/roller/page/jmxetc
Please let me know why I am sesing the
javax.management.MalformedObjectNameException:
Invalid character '*' in key part of property
exception.