Expert insights. Personalized for you.
java performance automation testing selenium automation selenium 3.0 Have you noticed the ubiquity of web forms while surfing the internet? Almost every website or web-application you visit leverages web-forms to gain relevant information about yourself. From creating an account over a web-application to filling a brief survey, web forms are everywhere! A form comprises web elements such as checkbox, radio button, password, drop down to collect user data. MORE
Static analysis of Java enterprise applications: frameworks and caches, the elephants in the room , Antoniadis et al., If you try running Soot , WALA , or Doop out of the box on a real-world Java enterprise application you’re likely to get very low coverage, or possibly even no results at all if the tool fails to complete the analysis. Popular static analysis frameworks for Java provide no support for the lifecycle or injected semantics of enterprise applications. MORE
java performance scalability latency cpu grpc rpc qpsAlmost every time I present RSocket to an audience, there will be someone asking the question: "How does RSocket compare to gRPC?" " Today we are going to find out. MORE
With the help of friends Robert Seacord and David Svoboda of CERT in particular, I posted a note and link to their CERT post today because people have been misunderstanding the recent Java vulnerabilities, thinking they’re somehow really C or C++ vulnerabilities because Java is implemented in C and C++. From the post: Are the Java vulnerabilities actually C and C++ vulnerabilities? You’ve probably seen the headlines: [US-CERT] Java in Web Browser: Disable Now! MORE
Something to test Java's performance. java performance apm tracing rum java profiler jvm performance web requestsManaging an application’s performance, and specifically keeping it in good condition, is one of the hardest challenges in software development. That’s true for virtually any programming language and platform. MORE
As you already know, TestNG or Test Next Generation is one of the most frequently used automation testing frameworks in Java. tutorial performance java tutorial selenium automated testing testng tutorial testng automation framework testng framework in selenium MORE
java big data performance apache ignite in-memory data grid in-memory caching distributed cacheOverview. This article compares different options for the in-memory maps and their performances in order for an application to move away from traditional RDBMS tables for frequently accessed data. In this case, for the sake of demonstration, I have taken 2 million dummy physician records that reside in the database table and migrated them to in-memory maps. MORE
java tutorial performance troubleshooting cpu java development tool java threads java memory leak java design pattern thread classIn this article, we are going to discuss how we troubleshoot a CPU spike problem that surfaced in a major trading application in North America. All of a sudden, this application’s CPU started to spike up to 100%. MORE
You may already know that JUnit and Mockito are two of the most popular testing libraries for Java applications, and you will find them in almost every Java application classpath. I often meet and work with Java developers who know Java well but haven't written a single unit test. java performance testing tdd unit testing junit online courses mockito unit tests java for beginners MORE
Generally, a unit should be a small part of the application — in Java, it is often a single class. java performance testing unit testing best practices testing pyramid testing best practicesUnit testing is a well-known practice, but there's lots of room for improvement! In this post, the most effective unit testing best practices, including approaches for maximizing your automation tools along the way. MORE
You may also like: Java-Distributed Caching in Redis. Redis developers who want to do local caching in Java will find that Redis doesn’t support this functionality out of the box. In this article, we’ll discuss how you can take advantage of local caching in Java and Redis with a third-party Redis Java client such as Redisson. java tutorial performance redis cache spring cacheBoost Redis. MORE
But with Java, there's another way to visualize the same CPU workload which provides some additional insight: **a Java package flame graph**. Instead of visualizing the stack trace hierarchy, this visualizes the Java package name hierarchy. Here is a normal stack trace-based [CPU flame graph] for Java, running a microbenchmark ( SVG ): The y-axis is stack depth. How much CPU time was in java/util methods directly, excluding child functions calls? MORE
We started reading official documentation, tutorials, blog posts and articles about Go, especially ones where authors shared their experiences of migration from Java to Go or comparison Java with Go, as at that moment, we'd been using Java for 15+ years. java microservices golang load testWhen Go first appeared in November 2009, we didn't hear much about it, and our first interaction happened in 2012 when Go version 1 was officially released by Google. MORE
Automate Appium Java Tests In Parallel. The beauty of Appium for mobile testing is that its tests can be written in any programming language including Python, Ruby, Java, JavaScript, and C#. While we have covered extensive Appium tutorials, in this article, we'll walk through how to automate Appium tests in parallel against our real devices using TestNG Java sample tests. java tutorial performance testng appium java testing appium testing MORE
Measure Java performance! From JDK-12 onwards, the JDK comes with JMH (Java Microbenchmark Harness), It is a toolkit that helps you implement Java microbenchmarks correctly. JMH is developed by the same people who implement the Java virtual machine (JVM) so they know the internals and how Java makes optimizations at run time. jvm jdk java 1.8 MORE
As a Java Developer, we need to cover a lot of scenarios to ensure the quality of our software and catch bugs as soon as possible when introducing a new code. java performance logging log4j unit test log lombok slf4j log4j2For 99% of all my use cases AssertJ, Junit, Mockito, and Wiremock are sufficient enough do cover the test cases. But for the other use cases, like unit testing info, debug or warn log messages, these frameworks don't help you out. MORE
Does every performance engineer need to know about how memory in Java works? To completely fine-tune the java performance bottlenecks for high performance my answer is YES. Java memory management is a significant challenge for every performance engineer and Java developer, and a skill that needs to be acquired to have Java applications properly tuned. MORE
It also defines a Java API so that the developer can define and supply his own values. java microservices microservice architecture microprofile grafana prometheus microprofile metricsIn this short video, Rudy de Busscher shows how to connect MicroProfile Metrics with Prometheus and Grafana to produce useful graphics and to help investigate your microservice architecture. The goal of MicroProfile Metrics is to expose monitoring data from the implementation in a unified way. MORE
java server performance parallelism socket ioC10K problem is a term that stands for ten thousand concurrently handling connections. To achieve this, we often need to make changes in the settings of created network sockets and default settings of Linux kernel, monitor the usage of the TCP Send/Receive Buffers and Queues and, in particular, adjust our application to be a good candidate for solving this problem. MORE
Most Java developers have had to debug their applications, usually to find and fix an issue there. This is where JDWP (Java Debug Wire Protocol) comes into play. In order to debug remotely executed JVMs (where the debuggee is separately launched locally or on another machine), the Java platform defines a protocol for communication between the JVM and the debugger. java performance jvm debugging remote debugging jdwp MORE
Although these COBOL applications operate with consistent performance, companies and governments are forced to transform them to new platforms and rewrite them in modern programming languages (like Java) for several reasons. IBM Java version 7. Dynatrace news. MORE
java java 8 spring framework glassfish technology and tools troubleshoot azure cloud saas application development thread dump thread memoryLearn how to troubleshoot your application. Recently we were troubleshooting a popular SaaS application. This application was slowing down intermittently. To recover from the problem, the application had to be restarted. This application was slowing down sometimes during high traffic volume periods; sometimes during low traffic periods as well. MORE
ArrayList and LinkedList are frequently used classes in the Java collection framework. java performance array linkedlist arraylist interview answers performance analysisIf you know only understand basic performance comparisons of ArrayList and LinkedList , but not the minor details of these two classes, then this article is for you. " ArrayList should be used where more search operations are required, and. MORE
Read on to find out some Java technical interview questions! Almost any Java technical interview contains several questions covering Java concurrency topics. A common scenario for a beginner-intermediate level sound like this: Interviewer: Can you enumerate the Java thread life cycle states? java performance interview concurrency thread thread life MORE
java performance jvm blocking profiler tool blocking codeBlocking code is code which blocks executing threads until their operations finish. It's not always bad to block a thread and wait until the result is ready but there are situations where it's not optimal from a throughput and memory point of view. This article assumes some basic knowledge about the differences between blocking and non-blocking code. MORE
Troubleshoot your Java application, the Sherlock Holmes way. Java application failure troubleshooting can be closely associated with the typical crime scene investigation. I read few Sherlock Holmes classic stories in recent times at home, while struggling to solve the Java application failure mysteries at the office. Java application failures can be painful at times when our application doesn't leave enough traces to help us to solve the mystery. MORE
For years, the debate has raged on regarding which programming language is better, Java or Scala. While some argue that just because Java is older it is better, others believe Scala is better for a variety of reasons. In essence, Java is classified as an object oriented programming language. It is designed to run in specific environments, like Java Virtual Machine for instance. If you feel more comfortable using simple code, then using Java is your best bet. MORE
How well does your Java perform? The traditional way of iterating in Java has been a for-loop starting at zero and then counting up to some pre-defined number: private static final int ITERATIONS = 10_000; @Benchmark public int forUp() { int sum = 0; for (int i = 0; i < ITERATIONS; i++) { sum += i; } return sum; }. performance jvm streaming java performance iteration data stream for loop graal vm cleverIteration Performance. MORE
App Dev & Testing, Testing, Test Automation, Ruby, Java, PythonWhat's the top language for writing software test automation scripts? Your guess is as good as anyone else's, because there's no agreement on this. And that's unfortunate. You would think by now we testers would have settled the debate. MORE
I feel that in the modern world of development, there are too many factors to pick a single tool for debugging any language, let alone Java. java performance ide debugging debug debuggers debugging tools debugging javascript ide for javascript development MORE
Java was initially designed as a safe, managed environment. Nevertheless, Java HotSpot VM contains a “backdoor” that provides a number of low-level operations to manipulate memory and threads directly. It is hard to imagine a Java developer who uses this backdoor in any regular development because this API is extremely dangerous, non portable, and volatile. There are at least two standard ways to do it in Java: put payload to thread local or use static field. MORE
To install RavenDB using Docker follows the step below: java nosql performance memcached jakarta ee jakarta jnosqlMemcached is an easy-to-use, high-performance, in-memory data store. It offers a mature, scalable, open-source solution for delivering sub-millisecond response times, unlike databases that store data on disk or SSDs, Memcached keeps its data in memory. This tutorial will cover how to use Memcached in Jakarta EE with Eclipse JNoSQL. Installing Memcached Using Docker. MORE
You may also like: Java Out of Memory Heap Analysis. The application was running on a GNU/Linux OS, Java 8, Tomcat 8 application server. performance api memory cpu java (programming lang. java (software What happens when you're out of memory? Recently we experienced an interesting production problem. This application was running on multiple AWS EC2 instances behind Elastic Load Balancer. MORE
This chapter aims to remind the reader why Hibernate has its place in high-performance data access, and the table of content looks like this: java performance hibernate jpa java persistenceSecond Part, Chapter 8. Now that the first part of my book is published, it’s time to focus on the second part, which covers both JPA and Hibernate. MORE
Spring makes it easy to write Java applications. Spring Boot allows us to quickly create Spring applications: build and run a Java application server with embedded Tomcat and your own controller in less than 5 minutes. Well, I admit I used Spring Initializer for that: java tutorial performance spring tomcat servlet apiIt is possible to improve the performance of application servers using Servlet 3.0 async, but is it necessary? Before We Start. MORE
The implementation is in core Java. Mowglee is a multi-threaded geo web crawler in Java. To do this, you should have intermediate to expert level core Java skills, an understand of the intricacies of multi-threading in Java, and an understand of the real-world usage of and need for web crawlers. This article provides the implementation of a web crawling system called Mowglee that uses geography as the main classifying criteria for crawling. MORE
One of the best tools we have today for understanding application behavior and troubleshooting performance issues are Java profilers. Java profilers monitor JVM execution at the bytecode level and can provide information on thread execution and locks, heap memory usage, garbage collection, hot methods, exceptions, class loading, and more. How Java Profilers Work. java performance java performance app performance profilers java profilers MORE
In my previous article, I wrote about the Modularity System , which was introduced in Java 9. With this writing, I would like to continue the Java evolution line by taking a glance about the main Java 9 features according to the performance improvements. Java 9 Feature: Performance Improvements. In Java 9, the most significant performance upgrade was concerned with the Garbage Collection. java performance java 9 garbage collector new features MORE
What Are Java Profilers? A Java Profiler is a tool that monitors Java bytecode constructs and operations at the JVM level. java open source performance monitoring jvm process java performance process monitoringTo help equip you for the ongoing process of optimization and the life of debugging ahead of you, we’ve gathered a list of the best tools to monitor the JVM in both development and production environments. And the best part? MORE
java performance software testing selenium slack appium java script robot framework collabaorationSlack is the hottest collaboration tool in the market today, both as an internal tool for teams working together and for external groups who share similar interest and need a place to collaborate and share ideas. Slack also offers a free tier which is used by many public communities such as software developers and testers. MORE
But let’s start from the beginning: Step #1 – Switching to Java 11. In order to leverage the new Memory Profiling feature I’s necessary that you upgrade to Java 11 as this version introduces new capabilities ( JEP 331 ) that allow tool vendors like Dynatrace to capture memory allocation information at run-time with zero overhead. Looked like a classical Thread Leaking issue: Dynatrace observed a thread leak after switching to Java 11 causing the JVM peak at 8k threads. MORE
Learn how to make your Java applications performance perfectly. In this blog post, we shall go over various aspects that have to be taken care of to extract maximum performance out of a Java Application running on Linux. Ensure there is enough RAM to hold your java process. Swapping java process to disk is a performance killer. java performance performance tuning java performance tuning java application linux performance MORE
java tips and tricks performance best practicesWhile solving issues related to NFRs (especially application performance), I always think about why we as developers give less importance (honorable exceptions are always there) to performance. Is this due to a lack of awareness? Many times, we start thinking of performance only at the time of a performance test or after deployment. MORE
These pauses are sometimes called Stop-The-World pauses, and the minimization of them is the primary concern of GC tuning, as they can have a huge impact on the performance of a Java application. java tutorial performance garbage collection java performance tuning gc garbage collector heapGarbage collection is the mechanism by which the JVM reclaims memory on behalf of the application when it's no longer needed. MORE
Java Related Topics DZone
JUNE 17, 2020
Does every performance engineer need to know about how memory in Java works? To completely fine-tune the java performance bottlenecks for high performance my answer is YES. Java memory management is a significant challenge for every performance engineer and Java developer, and a skill that needs to be acquired to have Java applications properly tuned.
DZone
AUGUST 5, 2020
I feel that in the modern world of development, there are too many factors to pick a single tool for debugging any language, let alone Java. java performance ide debugging debug debuggers debugging tools debugging javascript ide for javascript development
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
DZone
JANUARY 24, 2020
Troubleshoot your Java application, the Sherlock Holmes way. Java application failure troubleshooting can be closely associated with the typical crime scene investigation. I read few Sherlock Holmes classic stories in recent times at home, while struggling to solve the Java application failure mysteries at the office. Java application failures can be painful at times when our application doesn't leave enough traces to help us to solve the mystery.
DZone
MARCH 12, 2020
We started reading official documentation, tutorials, blog posts and articles about Go, especially ones where authors shared their experiences of migration from Java to Go or comparison Java with Go, as at that moment, we'd been using Java for 15+ years. java microservices golang load testWhen Go first appeared in November 2009, we didn't hear much about it, and our first interaction happened in 2012 when Go version 1 was officially released by Google.
DZone
APRIL 21, 2019
These pauses are sometimes called Stop-The-World pauses, and the minimization of them is the primary concern of GC tuning, as they can have a huge impact on the performance of a Java application. java tutorial performance garbage collection java performance tuning gc garbage collector heapGarbage collection is the mechanism by which the JVM reclaims memory on behalf of the application when it's no longer needed.
DZone
MAY 9, 2019
One of the best tools we have today for understanding application behavior and troubleshooting performance issues are Java profilers. Java profilers monitor JVM execution at the bytecode level and can provide information on thread execution and locks, heap memory usage, garbage collection, hot methods, exceptions, class loading, and more. How Java Profilers Work. java performance java performance app performance profilers java profilers
DZone
JANUARY 31, 2020
java server performance parallelism socket ioC10K problem is a term that stands for ten thousand concurrently handling connections. To achieve this, we often need to make changes in the settings of created network sockets and default settings of Linux kernel, monitor the usage of the TCP Send/Receive Buffers and Queues and, in particular, adjust our application to be a good candidate for solving this problem.
Dynatrace
APRIL 10, 2020
But let’s start from the beginning: Step #1 – Switching to Java 11. In order to leverage the new Memory Profiling feature I’s necessary that you upgrade to Java 11 as this version introduces new capabilities ( JEP 331 ) that allow tool vendors like Dynatrace to capture memory allocation information at run-time with zero overhead. Looked like a classical Thread Leaking issue: Dynatrace observed a thread leak after switching to Java 11 causing the JVM peak at 8k threads.
DZone
DECEMBER 4, 2019
Learn how to make your Java applications performance perfectly. In this blog post, we shall go over various aspects that have to be taken care of to extract maximum performance out of a Java Application running on Linux. Ensure there is enough RAM to hold your java process. Swapping java process to disk is a performance killer. java performance performance tuning java performance tuning java application linux performance
DZone
NOVEMBER 20, 2019
You may also like: Java-Distributed Caching in Redis. Redis developers who want to do local caching in Java will find that Redis doesn’t support this functionality out of the box. In this article, we’ll discuss how you can take advantage of local caching in Java and Redis with a third-party Redis Java client such as Redisson. java tutorial performance redis cache spring cacheBoost Redis.
DZone
MAY 12, 2019
You may already know that JUnit and Mockito are two of the most popular testing libraries for Java applications, and you will find them in almost every Java application classpath. I often meet and work with Java developers who know Java well but haven't written a single unit test. java performance testing tdd unit testing junit online courses mockito unit tests java for beginners
DZone
SEPTEMBER 9, 2019
How well does your Java perform? The traditional way of iterating in Java has been a for-loop starting at zero and then counting up to some pre-defined number: private static final int ITERATIONS = 10_000; @Benchmark public int forUp() { int sum = 0; for (int i = 0; i < ITERATIONS; i++) { sum += i; } return sum; }. performance jvm streaming java performance iteration data stream for loop graal vm cleverIteration Performance.
DZone
JANUARY 22, 2020
Measure Java performance! From JDK-12 onwards, the JDK comes with JMH (Java Microbenchmark Harness), It is a toolkit that helps you implement Java microbenchmarks correctly. JMH is developed by the same people who implement the Java virtual machine (JVM) so they know the internals and how Java makes optimizations at run time. jvm jdk java 1.8
DZone
JULY 1, 2019
To install RavenDB using Docker follows the step below: java nosql performance memcached jakarta ee jakarta jnosqlMemcached is an easy-to-use, high-performance, in-memory data store. It offers a mature, scalable, open-source solution for delivering sub-millisecond response times, unlike databases that store data on disk or SSDs, Memcached keeps its data in memory. This tutorial will cover how to use Memcached in Jakarta EE with Eclipse JNoSQL. Installing Memcached Using Docker.
DZone
MARCH 16, 2020
java performance automation testing selenium automation selenium 3.0 Have you noticed the ubiquity of web forms while surfing the internet? Almost every website or web-application you visit leverages web-forms to gain relevant information about yourself. From creating an account over a web-application to filling a brief survey, web forms are everywhere! A form comprises web elements such as checkbox, radio button, password, drop down to collect user data.
DZone
APRIL 18, 2019
The implementation is in core Java. Mowglee is a multi-threaded geo web crawler in Java. To do this, you should have intermediate to expert level core Java skills, an understand of the intricacies of multi-threading in Java, and an understand of the real-world usage of and need for web crawlers. This article provides the implementation of a web crawling system called Mowglee that uses geography as the main classifying criteria for crawling.
DZone
OCTOBER 8, 2019
Something to test Java's performance. java performance apm tracing rum java profiler jvm performance web requestsManaging an application’s performance, and specifically keeping it in good condition, is one of the hardest challenges in software development. That’s true for virtually any programming language and platform.
DZone
DECEMBER 3, 2019
Automate Appium Java Tests In Parallel. The beauty of Appium for mobile testing is that its tests can be written in any programming language including Python, Ruby, Java, JavaScript, and C#. While we have covered extensive Appium tutorials, in this article, we'll walk through how to automate Appium tests in parallel against our real devices using TestNG Java sample tests. java tutorial performance testng appium java testing appium testing
Dynatrace
JULY 21, 2020
Although these COBOL applications operate with consistent performance, companies and governments are forced to transform them to new platforms and rewrite them in modern programming languages (like Java) for several reasons. IBM Java version 7. Dynatrace news.
DZone
MAY 17, 2019
Generally, a unit should be a small part of the application — in Java, it is often a single class. java performance testing unit testing best practices testing pyramid testing best practicesUnit testing is a well-known practice, but there's lots of room for improvement! In this post, the most effective unit testing best practices, including approaches for maximizing your automation tools along the way.
DZone
JULY 16, 2019
Most Java developers have had to debug their applications, usually to find and fix an issue there. This is where JDWP (Java Debug Wire Protocol) comes into play. In order to debug remotely executed JVMs (where the debuggee is separately launched locally or on another machine), the Java platform defines a protocol for communication between the JVM and the debugger. java performance jvm debugging remote debugging jdwp
DZone
AUGUST 16, 2019
ArrayList and LinkedList are frequently used classes in the Java collection framework. java performance array linkedlist arraylist interview answers performance analysisIf you know only understand basic performance comparisons of ArrayList and LinkedList , but not the minor details of these two classes, then this article is for you. " ArrayList should be used where more search operations are required, and.
DZone
JUNE 4, 2019
java tips and tricks performance best practicesWhile solving issues related to NFRs (especially application performance), I always think about why we as developers give less importance (honorable exceptions are always there) to performance. Is this due to a lack of awareness? Many times, we start thinking of performance only at the time of a performance test or after deployment.
DZone
APRIL 18, 2019
What Are Java Profilers? A Java Profiler is a tool that monitors Java bytecode constructs and operations at the JVM level. java open source performance monitoring jvm process java performance process monitoringTo help equip you for the ongoing process of optimization and the life of debugging ahead of you, we’ve gathered a list of the best tools to monitor the JVM in both development and production environments. And the best part?
Alex Podelko
SEPTEMBER 4, 2018
For years, the debate has raged on regarding which programming language is better, Java or Scala. While some argue that just because Java is older it is better, others believe Scala is better for a variety of reasons. In essence, Java is classified as an object oriented programming language. It is designed to run in specific environments, like Java Virtual Machine for instance. If you feel more comfortable using simple code, then using Java is your best bet.
DZone
MARCH 16, 2020
java big data performance apache ignite in-memory data grid in-memory caching distributed cacheOverview. This article compares different options for the in-memory maps and their performances in order for an application to move away from traditional RDBMS tables for frequently accessed data. In this case, for the sake of demonstration, I have taken 2 million dummy physician records that reside in the database table and migrated them to in-memory maps.
DZone
JUNE 5, 2019
java performance jvm blocking profiler tool blocking codeBlocking code is code which blocks executing threads until their operations finish. It's not always bad to block a thread and wait until the result is ready but there are situations where it's not optimal from a throughput and memory point of view. This article assumes some basic knowledge about the differences between blocking and non-blocking code.
DZone
APRIL 18, 2019
This chapter aims to remind the reader why Hibernate has its place in high-performance data access, and the table of content looks like this: java performance hibernate jpa java persistenceSecond Part, Chapter 8. Now that the first part of my book is published, it’s time to focus on the second part, which covers both JPA and Hibernate.
Sutter's Mill
JANUARY 15, 2013
With the help of friends Robert Seacord and David Svoboda of CERT in particular, I posted a note and link to their CERT post today because people have been misunderstanding the recent Java vulnerabilities, thinking they’re somehow really C or C++ vulnerabilities because Java is implemented in C and C++. From the post: Are the Java vulnerabilities actually C and C++ vulnerabilities? You’ve probably seen the headlines: [US-CERT] Java in Web Browser: Disable Now!
The Morning Paper
SEPTEMBER 24, 2020
Static analysis of Java enterprise applications: frameworks and caches, the elephants in the room , Antoniadis et al., If you try running Soot , WALA , or Doop out of the box on a real-world Java enterprise application you’re likely to get very low coverage, or possibly even no results at all if the tool fails to complete the analysis. Popular static analysis frameworks for Java provide no support for the lifecycle or injected semantics of enterprise applications.
TechBeacon Testing
MARCH 31, 2020
App Dev & Testing, Testing, Test Automation, Ruby, Java, PythonWhat's the top language for writing software test automation scripts? Your guess is as good as anyone else's, because there's no agreement on this. And that's unfortunate. You would think by now we testers would have settled the debate.
Highly Scalable
FEBRUARY 2, 2012
Java was initially designed as a safe, managed environment. Nevertheless, Java HotSpot VM contains a “backdoor” that provides a number of low-level operations to manipulate memory and threads directly. It is hard to imagine a Java developer who uses this backdoor in any regular development because this API is extremely dangerous, non portable, and volatile. There are at least two standard ways to do it in Java: put payload to thread local or use static field.
DZone
APRIL 29, 2020
java tutorial performance troubleshooting cpu java development tool java threads java memory leak java design pattern thread classIn this article, we are going to discuss how we troubleshoot a CPU spike problem that surfaced in a major trading application in North America. All of a sudden, this application’s CPU started to spike up to 100%.
Brendan Gregg
JUNE 30, 2017
But with Java, there's another way to visualize the same CPU workload which provides some additional insight: **a Java package flame graph**. Instead of visualizing the stack trace hierarchy, this visualizes the Java package name hierarchy. Here is a normal stack trace-based [CPU flame graph] for Java, running a microbenchmark ( SVG ): The y-axis is stack depth. How much CPU time was in java/util methods directly, excluding child functions calls?
DZone
SEPTEMBER 8, 2020
As you already know, TestNG or Test Next Generation is one of the most frequently used automation testing frameworks in Java. tutorial performance java tutorial selenium automated testing testng tutorial testng automation framework testng framework in selenium
DZone
JANUARY 24, 2020
java java 8 spring framework glassfish technology and tools troubleshoot azure cloud saas application development thread dump thread memoryLearn how to troubleshoot your application. Recently we were troubleshooting a popular SaaS application. This application was slowing down intermittently. To recover from the problem, the application had to be restarted. This application was slowing down sometimes during high traffic volume periods; sometimes during low traffic periods as well.
DZone
JULY 2, 2020
It also defines a Java API so that the developer can define and supply his own values. java microservices microservice architecture microprofile grafana prometheus microprofile metricsIn this short video, Rudy de Busscher shows how to connect MicroProfile Metrics with Prometheus and Grafana to produce useful graphics and to help investigate your microservice architecture. The goal of MicroProfile Metrics is to expose monitoring data from the implementation in a unified way.
DZone
SEPTEMBER 25, 2019
You may also like: Java Out of Memory Heap Analysis. The application was running on a GNU/Linux OS, Java 8, Tomcat 8 application server. performance api memory cpu java (programming lang. java (software What happens when you're out of memory? Recently we experienced an interesting production problem. This application was running on multiple AWS EC2 instances behind Elastic Load Balancer.
DZone
JANUARY 20, 2020
Read on to find out some Java technical interview questions! Almost any Java technical interview contains several questions covering Java concurrency topics. A common scenario for a beginner-intermediate level sound like this: Interviewer: Can you enumerate the Java thread life cycle states? java performance interview concurrency thread thread life
DZone
JUNE 2, 2019
java performance scalability latency cpu grpc rpc qpsAlmost every time I present RSocket to an audience, there will be someone asking the question: "How does RSocket compare to gRPC?" " Today we are going to find out.
DZone
JUNE 30, 2019
java performance software testing selenium slack appium java script robot framework collabaorationSlack is the hottest collaboration tool in the market today, both as an internal tool for teams working together and for external groups who share similar interest and need a place to collaborate and share ideas. Slack also offers a free tier which is used by many public communities such as software developers and testers.
DZone
MARCH 5, 2020
As a Java Developer, we need to cover a lot of scenarios to ensure the quality of our software and catch bugs as soon as possible when introducing a new code. java performance logging log4j unit test log lombok slf4j log4j2For 99% of all my use cases AssertJ, Junit, Mockito, and Wiremock are sufficient enough do cover the test cases. But for the other use cases, like unit testing info, debug or warn log messages, these frameworks don't help you out.
DZone
SEPTEMBER 23, 2019
Spring makes it easy to write Java applications. Spring Boot allows us to quickly create Spring applications: build and run a Java application server with embedded Tomcat and your own controller in less than 5 minutes. Well, I admit I used Spring Initializer for that: java tutorial performance spring tomcat servlet apiIt is possible to improve the performance of application servers using Servlet 3.0 async, but is it necessary? Before We Start.
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