Ivo Magi

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Feb 17, 2017 · Ram Lakshmanan

I'd recommend to check https://plumbr.eu/handbook/garbage-collection-algorithms-implementations#g1 for more thorough explanation

The Seven Stages of the Programmer

Apr 17, 2015 · Justin Sargent

Having posted this statistics over three year periods, we now have empirical data that - whatever we call the particular infrastructure, there will always be an angle using which the terminology chosen seems incorrect. We have even analyzed this - https://plumbr.eu/blog/java/there-is-no-application-server - but in reality indeed it seems that Sun/Oracle/Java EE specification committee have not been too clear in how the vendors not implementing Full/Web Profiles should be labeled.

But whether it is apples or oranges, it will still not change the fact that the first "real" container is having several times less installations than the thing that even does not have a proper name ...

The Seven Stages of the Programmer

Apr 17, 2015 · Justin Sargent

Having posted this statistics over three year periods, we now have empirical data that - whatever we call the particular infrastructure, there will always be an angle using which the terminology chosen seems incorrect. We have even analyzed this - https://plumbr.eu/blog/java/there-is-no-application-server - but in reality indeed it seems that Sun/Oracle/Java EE specification committee have not been too clear in how the vendors not implementing Full/Web Profiles should be labeled.

But whether it is apples or oranges, it will still not change the fact that the first "real" container is having several times less installations than the thing that even does not have a proper name ...

The Seven Stages of the Programmer

Apr 17, 2015 · Justin Sargent

Having posted this statistics over three year periods, we now have empirical data that - whatever we call the particular infrastructure, there will always be an angle using which the terminology chosen seems incorrect. We have even analyzed this - https://plumbr.eu/blog/java/there-is-no-application-server - but in reality indeed it seems that Sun/Oracle/Java EE specification committee have not been too clear in how the vendors not implementing Full/Web Profiles should be labeled.

But whether it is apples or oranges, it will still not change the fact that the first "real" container is having several times less installations than the thing that even does not have a proper name ...

.NET/E – .net/everywhere

Dec 30, 2014 · Prabir Shrestha

Hi

As an example of the most common lock we find regularly occurring in around 10% of the applications Plumbr monitors is caused by synchronized loggers. Whenever the application is using Log4j or Logback loggers with synchronized appenders, it is pretty much guaranteed that under load the contention events occur and logging calls will start queuing up.

To the alternatives - indeed, as with all performance problems there are alternative ways to overcome the situation at hand. VisualVM is one of such tools - when attached to the JVM you can indeed spot locked threads in case you keep your eye on the thread view. But first and foremost, it is not built for monitoring and is used only for troubleshooting, when you already suspect locks. Another important aspect is that locked threads in VisualVM are not anyhow linked to actual root causes and the impact is not measured - with Plumbr we link contention events to actual root causes and measure the aggregated impact, making both triaging and fixing the issues easier.

Support for different 3rd party ExecutorServices is on the roadmap - we are currently analyzing the landscape to set priorities on which to start supporting next, we expect to have several updates in this regard during 2015.

We have not used the referred Eclipse plug-in, at first glimpse it seems a good way to visualize a thread dump, but again, not a monitoring solution to be used to constantly keep an eye on your JVM. Will take a look at it in more details.

Is Java WORA after all?

May 09, 2013 · Ivo Magi

In the sense you are completely correct, most of the applications do not go to the extremes Plumbr is forced to deal with. But the usual Java EE applications also tend not to be happy with the switch from for example 32-bit Windows to the 64-bit Mac OS X. Usually you still find one or two things you need to tweak.

OpenJPA: Memory Leak Case Study