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Harsha Jayamanna

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AWS Cognito + Spring Complete Example

aws cognito Java oauth2 spring

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A Software Engineer with more than 5 years of Experience.
Check my links :

https://www.linkedin.com/in/harsha-jayamanna-26996827/
https://github.com/h-hub
https://stackoverflow.com/users/2184946/harshakj89
https://twitter.com/HarshaJayamanna

Email: harsha.kj89[at]gmail[dot]com

Phone : +[65]91658950

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Popular Posts

Factors affecting the Java Benchmarking.

In computing, a benchmark is an act of running a computer program, a set of programs, or other operations, in order to assess the relative performance of an object, normally by running a number of standard tests and trials against it. Benchmarking in java can be boiled down to measuring how long some operation takes. To measure and find which approach is better, we can write a small benchmark program, often called a Microbenchmark.
Evaluating performance and obtaining metrics of codes in applications, frameworks and tools are essential for developers. but to do that properly, we need to have an understanding of how the JVM actually executes Java bytecodes including dynamic compilation and optimization. According to Brian Goetz, Without understanding the dynamic compilation process, it's almost impossible to correctly write or interpret performance tests for Java classes. Even with that knowledge, it is still difficult to write a proper benchmark program.
Dynamic compilation and o…

Use Enterprise Java for Microservices : MicroProfile

Eclipse MicroProfile or in other words, "Optimized Enterprise Java for a Microservices Architecture" is a way to eliminates the risk of vendor lock-in and maintains the developers’ freedom of choice when implementing Microservices. Microservices is the most popular architecture when creating cloud-native applications.

I have written another article which introduces microservices.
https://www.harshajayamanna.com/2019/01/introduction-to-microservices_30.html

Eclipse MicroProfile is an open-source community specification for Enterprise Java microservices.
It is a project under Eclipse foundation and backed by individuals, organizations, vendors.

I have highlighted the word "specification" in the previous paragraph. That means Microprofile is a specification which can be implemented by anybody and that eliminates the risk of vendor lock-in. Some of the specifications which developers are already familiar with are Java EE 8 Specification and Java Persistence 2.1 Specific…

A Study on Linux Kernel

Kernel is the central or most important part of something. Linux Kernel plays a role which is similar to that. Linux Kernel is the core or the most impotent part of an operating system. Some of the operating systems which have the Linux Kernel as the core are GNU/Linux, Ubuntu Linux, Linux Mint, Arch Linux, Deepin, Fedora, Debian and openSUSE.
Figure 00: Few Linux Distributions
The kernel is the part which loads first when the operating system starts and remains in the protected area of the main memory. Kernel is the hardware abstraction layer. It enables the application layer to connect with the hardware layer and vice versa. Kernel is in charge of memory management, process management, task management, and disk management.

Figure 01: Roll of the Kernel

History In 1960 MIT, Bell Labs, and General Electric Developed an operating system called Multics(Multiplexed Information and Computing Service) for the GE-645 mainframe computers. Multics not only brought many new innovations but also …

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