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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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How to get ascii code from a char?

One more tip is added to Essential Code Examples and Commands for Java Programmers

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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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How to run Tomcat only on one IP address?

Question: We run Tomcat on a powerful server with multiple ethernet cards and even more numerous IP addresses. We noticed that our web application on Tomcat server answers on the all network interfaces. It poses some security threat to our product. We would like to limit access to our Tomcat by just one network interface, let say eth2 (we have eth0, eth1, eth2, eth3) . Or by certain IP addresses. How we could accomplish this?

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