Tomcat-Tradelite7 Performance of OpenJ9 with default Shared Cache

Tomcat is a very popular and widely used application server. In this article I will show how Tomcat users can get some good performance boosts by using the Eclipse OpenJ9 JVM. In different articles, we observed that OpenJDK8-OpenJ9 performed better with Startup and Footprint compared to OpenJDK8-HotSpot. Now with Shared Cache enabled by default with…

Relationship verification… Let’s get lazy!

It’s complicated… Relationship verification is very important, but can we be a little lazy about it? Java bytecode verification entails several processes, one of which is class relationship verification. Java Virtual Machine (JVM) startup includes any JVM or application setup preceding the actual execution of the program, and one of these steps is verification. Consequently,…

Running Payara Micro on OpenJ9

In the cloud environment, you need to bring up your microservices applications quickly and frequently in respond to user demands. Therefore, having a JVM that starts up faster is important. Eclipse OpenJ9 is a JVM that has a fast start-up performance and a low memory footprint. This post outlines how to improve the start-up performance…

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OpenJ9 class sharing is enabled by default

Class sharing is a feature in Eclipse OpenJ9 that improves your application’s startup performance. It also reduces the memory footprint if the same cache shared across multiple JVMs. Traditionally, this feature is turned on by explicitly specifying option -Xshareclasses in the command line. Default Class Sharing Class data sharing is enabled by default for bootstrap…

Categoriesvm

Debugging Java Applications using Watched Fields

Debugging can be quite tedious, complex and cumbersome. Detailed within this blog we will explore how to make Java debugging a bit easier by leveraging the JVM’s embedded debugging tools. Native C/C++ debuggers utilize operating system hooks to debug an application. The Java Virtual Machine (JVM) includes it’s own unique and powerful toolkit for debugging;…