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

Extends Writing low latency applications in Java interview Q&As. If the job description says “low latency” application, then be prepared. Even if “low latency” experience is not a requirement, all employers like candidates who can not only build systems that perform well, but also can stress test (e.g. JMeter), profile…...

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Posted in FAQs Java Key Areas, Judging Experience Q&As, Low Latency, Low latency & Asynchronous, member-paid, 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

If you want to process medium size data files (i.e. 2 GB to 1 TB ) in Java, consider writing a batch job with Spring batch or Java EE 7.0 batch processing. If processing requires access to other systems, use “spring integration” with spring batch. This is also known as…...

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30-Day-Java-JEE-Career-Companion, 90-Day-Java-JEE-Career-Companion, 180-Day-Java-JEE-Career-Companion, 365-Day-Java-JEE-Career-Companion and 2-Year-Java-JEE-Career-Companion Feel free to evaluate the quality of the contents Free FAQs | HomeTry Log In | Register
Posted in IO, member-paid, Performance

♦♥ Processing large files efficiently in Java – part 1

Q1. What are the different file sizes, and what technologies can be used to process them? A1. A large file is a relative term. Some may consider 1 GB file to be large file. In general, data sizes can be classified as shown below. 1) Small size data is <

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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 FAQs Java Key Areas, Judging Experience Q&As, Low Latency, Low latency & Asynchronous, Performance, Scalability

10: ♦ 8 Java Maps & Caching Data in Java Interview Q&As

Q1. What is the purpose of a Map interface in Java collection API? A1. A map is a set of associations between pairs of objects. One is known as a “key” and the other is known as a “value”. It is used very frequently in programming in case where for…...

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30-Day-Java-JEE-Career-Companion, 90-Day-Java-JEE-Career-Companion, 180-Day-Java-JEE-Career-Companion, 365-Day-Java-JEE-Career-Companion and 2-Year-Java-JEE-Career-Companion Feel free to evaluate the quality of the contents Free FAQs | HomeTry Log In | Register
Posted in Collection and Data structures, 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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