Java application monitoring plugin

Verax NMS Java application management plugin allows easy monitoring, alerting, health check, management and performance reporting for any stand-alone Java applications (i.e. running without an application server) using Java 1.5 or higher. Applications are monitored via JMX MBeans (Management Beans).

General information view

Verax NMS: Java application management plugin

The general view displays high level application information such as:

  • Used Java Virtual Machine (JVM) information: vendor, version and bits (32 or 64).
  • JVM process identifier (PID) in the operating system and JVM start time.
  • Command line arguments such as Xmx or XX memory parameters and others.
  • Class paths used and detailed list of Java Archives (JARs) loaded.
  • External library paths (e.g. for JNI dynamic libraries or nonstandard JARs).

Memory view

The memory view displays detailed application memory consumption in the JVM including:

  • Totals for JVM's physical memory and swap space (used and available).
  • Heap vs. non-heap memory usage: pool name, % used, initial usage, maximum usage and amount of committed memory.
  • Detailed information about memory pools in the JVM: type, name, % used, initial usage, maximum usage and amount of committed.
  • Detailed information about garbage collectors: name, number of collected objects, collection time and general status (valid, invalid)
  • All objects requiring attention (e.g. invalid garbage collectors, excessively used memory pools) are highlighted for easy troubleshooting.

Threads view

The threads view displays detailed information about application's threads of execution:

  • Thread totals: number of currently running threads, maximum peak threads since start and number of daemon threads.
  • Numbers of loaded and unloaded Java classes.
  • Detailed summary for each threads: thread name, state (runnable, blocked, etc.), block & wait counts, CPU time and deadlock status.
  • All threads that have a deadlock are marked for easy troubleshooting.

Predefined Java application monitoring templates

The plugin provides predefined templates for most commonly monitored Java application items (listed in the table below). By default Verax NMS creates default counters similar to the ones displayed by the JMX Console. Other, user-defined sensors and performance counters can be added.

Java application monitoring templates
Java Heap Memory Usage
Java Java Loaded Class Count
Java Free Physical Memory Size
Java Free Swap Space Size
Java Process Cpu Time
Java PS Perm Gen Usage
Java PS Old Gen Usage
Java PS Eden Space Usage
Java PS Survivor Space Usage
Java PS Scavenge Collection Count
Java PS MarkSweep Collection Count
Java Unloaded Class Count
Java Thread Count
Java Daemon Thread Count
Java Non-Heap Memory Usage
GlassFish Server monitoring templates
GlassFish Error count per second
GlassFish Average web request processing time, in milliseconds
GlassFish HTTP web requests count per second
GlassFish Committed transactions count per second
GlassFish Roll-backed transactions count per second
GlassFish JVM threads count
GlassFish Live daemon threads count
GlassFish HTTP listener busy threads count
GlassFish HTTP listener executed tasks count
GlassFish Current active sessions
GlassFish Created HTTP sessions count per second
GlassFish Expired HTTP sessions count per second
GlassFish HTTP request count per second
GlassFish HTTP errors count per second
GlassFish Average request processing time
GlassFish Number of responses with status code 2xx per second
GlassFish Number of responses with status code 3xx per second
GlassFish Number of responses with status code 400 per second
GlassFish Number of responses with status code 403 per second
GlassFish Number of responses with status code 404 per second
GlassFish Number of responses with status code 4xx per second
GlassFish Number of responses with status code 503 per second
GlassFish Number of responses with status code 5xx per second
GlassFish Number of responses with a status code outside the 2xx, 3xx, 4xx, and 5xx range per second
GlassFish Amount of heap memory in bytes committed for JVM to use
GlassFish Amount of non heap memory in bytes committed for JVM to use
GlassFish Approximate number of objects, for which finalization is pending
GlassFish Amount of used heap memory in bytes
GlassFish Amount of used non heap memory in bytes
GlassFish Number of PS MarkSweep collections per second
GlassFish Approximate accumulated PS MarkSweep collection elapsed time in milliseconds per second
GlassFish Number of PS Scavenge collections per second
GlassFish Approximate accumulated PS Scavenge collection elapsed time in milliseconds per second
GlassFish Number of hits on cached file content per second
GlassFish Number of misses on cached file content per second
GlassFish Current cache size in bytes
GlassFish Number of cache lookup hit per second
GlassFish Number of hits on cached file info per second
GlassFish Number of misses on cached file info per second
GlassFish Size of mapped memory used for caching in bytes
GlassFish Number of cache lookup misses per second
GlassFish Number of current open cache entries
GlassFish The number of open/active connections
GlassFish Number of times the queue has been too full to accommodate a connection per second
GlassFish Number of connections currently in the queue
GlassFish Average number of connections queued
GlassFish Time (in milliseconds) spent in compilation per second
GlassFish Number of classes that are currently loaded in the JVM
GlassFish Number of classes that have been unloaded from the JVM per second
GlassFish Wait queue length
GlassFish Number of free connections in the pool.
GlassFish Average wait-time-duration per successful connection request
GlassFish Number of connections in the pool that timed out between the start time and the last sampling time
GlassFish Number of potential connection leaks per second
GlassFish Number of connections acquired
GlassFish Number of connections released back to the pool

See also

Apache Tomcat application server management plugin »

JBoss application server management plugin »