JMXMon Samples Collector. How to get an element of an array of values

[Aksiniya Ryzhova]

I am trying to collect statistics with JMXMon Samples Collector.

There is an element for which the key looks like:

 name   |    value

per hour | java.lang.Long[168]

per minute | java.lang.Long[60]

per second | java.lang.Long[60]

per week | java.lang.Long[168]

As seen above, in the "value" field is an array.
If in the sampler in the field "key" specify only "per minute" for example, then I get the error:

ERROR - jmeter.JMeter: Uncaught exception:  java.lang.NumberFormatException: For input string: "[J@37abc20b"
    at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)

Please tell me how I can compose the value for the "key" field to get a certain element of this array, for example the last

[Till Neunast]

On Friday, November 2, 2018 at 4:11:51 AM UTC+13, Aksiniya Ryzhova wrote:

Please tell me how I can compose the value for the "key" field to get a certain element of this array, for example the last

The "key" field is only used for CompositeDataSupport objects, so you will have to submit a pull request.

For example at https://github.com/undera/jmeter-plugins/blob/master/plugins/jmxmon/src/main/java/kg/apc/jmeter/jmxmon/JMXMonSampler.java#L119, this

if (key != null && !key.equals("")) {
    log.error("key specified, but didnt get composite object from JMX. Will continue anyway.");
}

...could become something like this:

if (key != null && !key.equals("")) {
    if (o.getClass().isArray()) {
        int index = "-1".equals(key) ? java.lang.reflect.Array.getLength(o)-1 : Integer.parseInt(key);
        o = java.lang.reflect.Array.get(o, index);
    } else {
        log.error("key specified, but didnt get composite object from JMX. Will continue anyway.");
    }
}

HTH,

Till