Monitoring GlassFish With Java8 And Nashorn
GlassFish emits JSON monitoring data over HTTP. Java 8 comes with JavaScript "Nashorn" engine with shell scripting support. JSON stands for "JavaScript Object Notation" and is easily accessible from JavaScript:
#!/usr/bin/jjs
print("${numberOfRollbacks()} rollbacks");
function numberOfRollbacks() {
var command = "curl http://localhost:4848/monitoring/domain/server/transaction-service/rolledbackcount.json";
$EXEC(command)
var result = $OUT;
var elements = JSON.parse(result);
return elements.extraProperties.entity.rolledbackcount.count;
}
Output is (hopefully):
0 rollbacks
The script above can be easily extended to monitor different aspects: from http, over JDBC connection pools, to even application specific performance metrics. See also: RESTful GlassFish Monitoring and Management and http://lightfish.adam-bien.com.
See you at Java EE Workshops at MUC Airport!
If script is not working, make sure you have set monitoring-level to high in:
Configurations/server-config/Monitoring
Btw, I really like you lightFish presentation. I need to check the program out. Is deployment over the app also possible?
Posted by FilterPunk on March 06, 2014 at 11:02 AM CET #
Does glassfish supports JSONP, to integrate monitoring on websites?
Posted by Nikolai Alex on March 07, 2014 at 12:29 PM CET #