Hi,
I have a specific error I need help with, but I may also be approaching the problem incorrectly, so more general advice also appreciated. Sorry for the length of this email - the questions are at the end, after all the background data. (this is all with Camel 2.23.1, OpenJDK 1.8.0_111-b15, CentOS 7.2) I want to read the local JVM heap usage and write it to a file (the final task is to write a variety of values for analysis later - the client has some problem that occurs from time to time and they want some way of looking back and trying to work out what happened). I have the following Spring XML config: <?xml version="1.0" encoding="UTF-8"?> <beans ...> <camelContext xmlns="http://camel.apache.org/schema/spring";> <route> <from uri="jmx:platform?objectDomain=java.lang&key.type=Memory&observedAttribute=HeapMemoryUsage&monitorType=gauge&thresholdHigh=0&thresholdLow=0&notifyHigh=True"/> <log message="Got something"/> <to uri="file:target/messages/dump"/> </route> </camelContext> </beans> The important part is the URI: jmx:platform?objectDomain=java.lang& key.type=Memory& observedAttribute=HeapMemoryUsage& monitorType=gauge& thresholdHigh=0 thresholdLow=0& notifyHigh=True This is giving the error (returned as an XML message): <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <MonitorNotification xmlns="urn:org.apache.camel.component:jmx"> <source>java.lang:name=camel-jmx-monitor-613d8391-408a-4677-9687-afcbf434d7bc</source> <message>The observed attribute value does not implement the Comparable interface.</message> <sequence>0</sequence> <timestamp>1548695162038</timestamp> <dateTime>2019-01-28T14:06:02.038-03:00</dateTime> <type>jmx.monitor.error.type</type> <derivedGauge>null</derivedGauge> <observedAttribute>HeapMemoryUsage</observedAttribute> <observedObject>java.lang:type=Memory</observedObject> <trigger>null</trigger> </MonitorNotification> I suspect this is because the HeapMemoryUsage attribute is of type javax.management.openmbean.CompositeData. So, finally, my questions are: * How do I access structured data like this? * If I just want the values every X seconds, can I just poll for values? * Should I be doing something else? Like maybe configuring my own notification? If so, is there some guide for dummies? And can this be automated for monitoring many different valeus? Thanks, Andrew
