Custom Java applications today are much larger and more complex than ever before. The sheer number of interdependencies in object-oriented, multi-threaded Java programs makes it difficult to ensure performance without assistance. Without a way to help identify and fix application performance problems in pre-production, the business is at risk of poorly performing code finding its way into production and creating adverse impact.

JProbe is an enterprise-class Java profiler providing intelligent diagnostics on memory usage, performance and test coverage, allowing developers to quickly pinpoint and repair the root cause of application code performance and stability problems that obstruct component and integration integrity.

JProbe also offers an Eclipse plug-in that provides intelligent code performance analysis and problem resolution directly within the Eclipse Java IDE.

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If you interested in Java and robots/robotics you can look at new site ROBOkhod . It is new site and have not so much articles but can be helpfull for those who has no knowledge about robotics. Site publishes articles on regular base and soon will become bigger.

Here you can find descriptions, code examples and references to how use Java in small processors and microcontrollers.

Click here: --> http://www.robokhod.com

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Java's catch or specify requirement

Part I was published here, Part II was published here.

As stated previously, Java requires that a method either catch or specify all checked exceptions that can be thrown within the scope of the method. This requirement has several components that need further description: "catch", "specify," "checked exceptions," and "exceptions that can be thrown within the scope of the method."

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Advantage 3: grouping error types and error differentiation

Part I was published here.

Often exceptions fall into categories or groups. For example, you could imagine a group of exceptions, each of which represents a specific type of error that can occur when manipulating an array: the index is out of range for the size of the array, the element being inserted into the array is of the wrong type, or the element being searched for is not in the array. Furthermore, you can imagine that some methods would like to handle all exceptions that fall within a category (all array exceptions), and other methods would like to handle specific exceptions (just the invalid index exceptions, please).

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Exceptions I

by: Anatoliy Malyarenko

Abstract

Contents of the lecture.

• What's an exception and why do I care?
• First encounter with Java exceptions.
• Java's catch or specify requirement.
• Dealing with exceptions.

Introduction

If there's a golden rule of programming it's this:

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JProfiler let's find your bugs in just 10 minutes!

It is true! Exactly 10 minutes you need to download it, run with your program and find why your program spends much memory and time in just that Java class! Find why just one-two classes try to sabotage the whole your Java project

JProfiler enables Java developers to tune up the performance of their Java programs. It combines in a single tool the capabilities for detailed examination of VM load and applications’ work, for memory usage and CPU loading, etc.

JProfiler is an ideal choice for profiling of embedded devices and target boards, due to the highly optimized architecture and low memory consumption of the agent profiling component. JProfiler allows for both local and remote profiling. It can be used as a stand-alone tool or within the Eclipse environment.

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Just Published: Murach's Java Servlets and JSP (2nd Edition)

A great way for anyone with the basic Java SE skills to get started with Java EE! From setting up a web development environment to using servlets and JSPs the right way to working with databases, this book focuses on developing web applications like a pro.

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Try without catch.. ?

Many people believe that if they use try block then they are obligated to continue with catch block, catch some Exception and do something with it

It is not quite right opinion

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Improve page loading time on Tomcat server.

If you use Tomcat server to serve remote clients over the Internet you can significantly improve page loading time by enabling content compression. A content become compressed when it transports over the Internet. All modern browsers support HTTP/1.1 GZIP compression and if your server also enables it, the page load time decreases dramatically. They just popping out in a browser, like if they were served from a local server.

Enable compression In Tomcat for certain file types

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