GC easy – Universal Java GC Log Analyser



Simulation und Fehlerbehebung von Deadlocks in Kotlin – Bahnbrechende Deadlocks

We would like to extend our thanks to JavaMagazin for translating and publishing our article ‘Simulating and troubleshooting deadlocks in Kotlin’ in the German language. It is an honor to have our work published in a print magazine, that... Continue Reading →

Simulating & troubleshooting OOMError in Kotlin

In this series of simulating and troubleshooting performance problems in Kotlin, let’s discuss how to simulate the ‘java.lang.OutOfMemoryError: Java Heap space’ problem. ‘java.lang.OutOfMemoryError: Java Heap space’ will be thrown by the application, when it generates more objects than the maximum... Continue Reading →

Simulating & troubleshooting StackOverflowError in Scala

In this series of simulating and troubleshooting performance problems in Scala, let’s discuss how to simulate StackOverflowError. StackOverflowError is a runtime error, which is thrown, when a thread's stack size exceeds its allocated memory limit.  Video: To see the visual... Continue Reading →

Troubleshooting Microservice’s OutOfMemoryError: Metaspace

Recently we confronted an interesting 'java.lang.OutOfMemoryError: Metaspace' problem in a Microservice application. This Microservice application will run smoothly for initial few hours, later it will start to throw java.lang.OutOfMemoryError: Metaspace. In this post let me share the steps we pursued... Continue Reading →

Memory leak due to improper exception handling

In this post let's discuss an interesting memory problem we confronted in the production environment and how we went about solving it. This application would take traffic for a few hours after that it would become unresponsive. It wasn't clear... Continue Reading →

Troubleshooting OutOfMemoryError – Heap dump, Eclipse MAT

Learn how to troubleshoot OutOfMemoryError using the Eclipse MAT tool. You will learn best practices, cool tips & tricks to debug memory problems effectively. Watch this video to know more! Video

Buggy App – Simulate performance problems

Buggy App is a simple java application that simulates different performance problems like Memory Leak, OutOfMemoryError, CPU spike, thread leak, StackOverflowError, deadlock, unresponsiveness, ... Using this application, you can simulate various performance problems in your environment. Here are a few... Continue Reading →

TCP: out of memory — consider tuning tcp_mem

Recently we experienced an interesting production problem. This application was running on multiple AWS EC2 instances behind Elastic Load Balancer. The application was running on GNU/Linux OS, Java 8, Tomcat 8 application server. All of sudden one of the application... Continue Reading →


Procedures to diagnose and solve all the 5 types of OutOfMemoryErrors that happen within the JVM heap are same. In this article, let's explore how to diagnose these 5 types of OutOfMemoryErrors.

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