Analyzing Java Problems – Tools, Snippets and Workflows

Mon, 30 Apr 2018 00:00:00 +0200

When we need to investigate the cause for a dysfunctional Java application we have a plethora of tools available that on the one hand help us in gathering information, artifacts and statistics and on the other hand help us in processing this information and identifying possible problems.

The following list of tools, snippets, workflows and information about specific artifacts could provide a starting point for analyzing such problems and covers topics like heap-dumps, thread-dumps, heap-histograms, heap-regions, garbage-collection-logs, hotspot-compiler/codecache-logs, debugging native-memory, tools for heap-dump-analysis, JVM unified logging and more..

Snippet: Java Mission Control (JMC) and Flight Recorder (JFR)

Wed, 11 Oct 2017 00:00:00 +0200

The Java Mission Control and the Java Flight Recorder allow us to capture run-time information from our Java applications without much overhead and aggregate profiling information.

I have written down the commands that I’m using the most when profiling a Java application with this tool chain in the following article.

Figure 1. Java Mission Control - Report

Running Java Mission Control (JMC)

We may start the JMC user interface shown above using the jmc command that is shipped with Oracle’s JRockit or Java (since Java 7 update 40).

Jcmd on Micha Kops' Tech Notes

Analyzing Java Problems – Tools, Snippets and Workflows

Snippet: Java Mission Control (JMC) and Flight Recorder (JFR)

Running Java Mission Control (JMC)