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02: ♥♦ 13 Tips to write low latency applications in Java

Extends Writing low latency applications in Java Q&A. Tip #1: Use a RTSJ (Real Time Specification for Java ) JVM.  IBM, Oracle, and other smaller vendors have implemented this, but it comes at a cost. Oracle’s JavaRT, IBM’s real-time WebSpere, and aicas JamaicaVM to name a few popular ones. In

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Posted in Java Architect Interview Q&A, Java Key Area Essentials, Judging Experience Interview Q&A, Low Latency, Performance, Scalability
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javap, jps, jmap, and jvisualvm tutorial – analyzing the heap histogram

Q1. Is there anything wrong with the code snippet shown below?

A1. The above code creates too many “Integer” objects due to auto boxing.

Q2. How do you know that the above auto unboxing and boxing code were executed? A2. Because of “javap“. “SumNumbers” is the class file

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Posted in Memory Management, Performance

Processing large files efficiently in Java – part 2

Processing large files efficiently in Java – part 1 covered different ways to read a large file. This post extends that to include some processing logic in addition to reading a file using Java 8 stream. This can be applied to files that can be split. For example, CSV files.

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Posted in IO, Performance

Processing large files efficiently in Java – part 1

Q1. What are the key considerations in processing large files? A1. Before jumping into coding, get the requirements. #1. Processing a file involves reading from the disk, processing, and writing back to the disk. It is also a trade off in terms of what is more important to you like

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Posted in IO, Memory Management, Performance
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Understanding service and socket timeouts in Java enterprise applications

Q. Why is it important to set proper timeout values in your applications? A. Security and performance. Security reason: it is often necessary to control how long a Web Service client or other valuable clients invoking valuable resources like database connections, transaction management, etc waits for a response after sending a

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Posted in Performance, QoS, Security

♦ 01: 30+ Writing low latency applications in Java interview Q&As

Have you seen job advertisements requiring Java candidates to work in real-time, low latency, and high throughput systems? Wondering what questions you will be asked? You will be quizzed on the low latency application you had recently worked on especially the outcomes in terms of the latencies, response times, and…...

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Posted in Java Architect Interview Q&A, Java Key Area Essentials, Judging Experience Interview Q&A, Low Latency, member-paid, Performance, Scalability

Caching Data in Java and LRU strategy

Q. What is the purpose of using a cache? A. A cache is an area of local memory that holds a copy of frequently accessed data that is otherwise expensive to get or compute. Examples of such data include a result of a query to a database, a disk file…...

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Posted in member-paid, Memory Management, Performance

♥ JMeter for testing RESTFul web services by posting JSON data and how to use BeanShell

We looked at “JMeter Performance testing Interview Q&A” covered in a Q&A and tutorial style. This is a brief extension to cover JSON HTTP post. Now a days, a single page interactive web sites are very popular, and they post JSON based data back to the server to create a

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Posted in JMeter, JMeter Tutorial, Performance, Performance Testing Q&A
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