Know The List of Common Java Application Development Errors

Know The List of Common Java Application Development Errors

Java is the most popular programming language for software development. It is serving application development industry from the last two decades and is more common among developers than C or C++. Despite its remarkable performance & popularity it still has flaws. Here are a few common Java development errors programmerscommit during theapplication development. In this blog, we have discussed the most common errors in detail for better understanding and for development of flawless application.

1. Skipping Access Modifiers

Don’t ask the reason, but developers mostly naïve often forget the relevance of the protected access modifier in Java programming. In may be the anxiety and work pressure this mistake happens, but they mention only this:

• protected fields, methods and constructors is accessible from the same package
• protected fields, methods and constructors is accessible from sub-classes

2. Avoiding use of equals()

If you apply == (comparison operator) rather than an equals() call, then you are making a serious Java development error and the result is completely opposite.

Never use == when comparing two Strings and in general almost any object. == compares the object reference of the two operands basically the memory address and not their content.

3. Passwords as String

Storing passwords in a String object is a big security issue, as it is vulnerable to memory attacks. Make use of char[] , as JPasswordField and Password4j is already doing. If it is about web applications, most web containers pass text password in the HttpServletRequest object like String, thus in this scenario no option is left.

Strings are cached by the JVM and stored in the heap space. In both scenarios the cached values are removed after the garbage collection.This means developer are unaware of a specific value deleted from the String pool.

The other concern is that Strings are immutable, thus clearing them is impossible. While char[]is not immutable and can be erased after processing it. With this easy approach the attacker get access to zeroed arrays in memory rather than just plain text passwords. This is a perfect strategy for Java Development Company when building an engaging web application for client.

4. Retuning null

The trouble with returning null is that you are forcing the caller on performing a null check on the result; here in this scenario, the caller is hopeful of getting an empty list as no item is present.

You always look to return either an exception or a special object using your code will be impacted by NullPointerExceptions.

5. Passing null

Passing null means that the code you are calling can manage a null. If this is not correct, your application will surely throw a NullPointerException for guaranteed. In addition, a lot of confusion is created within the code when null is passed explicitly. The following is a classic example

Public void init() {

grantAccessToUser(null);

}

private void grantAccessToUser (user user){

……

} 

When init() is called, no User object is available. Hence why calla method that operates with User when nosingleUser is present? If you need the logic in grantAccessToUser() make sure to extract it in a unique way and use it instead of passing a null.

6. Missing ‘break’ in a Switch Case

These Java issues are embarrassing for Java Development Company, and sometimes remain undiscovered until executed. Fallthrough behavior in Switch is useful; but missing a “break” keyword when such behavior is not required can trigger disastrous results. If you don’t put a “break” in “case 0” like below code, the program will output “Zero” followed by “One”, as the control flow will go through the whole “switch” statement until it reaches a “break”.

public static void switchCasePrimer() {

            intcaseIndex = 0;

            switch (caseIndex) {

            case 0:

            System.out.println(“Zero”);

            case 1:

            System.out.println(“One”);

            break;

            case 2:

            System.out.println(“Two”);

            break;

            default:

            System.out.println(“Default”);

            }

}

In most scenarios, the right solution is to make use of polymorphism and move code with specific behaviors within separate classes.

So, these are some of the few common mistakes made by the Java developers during the web application development.

Frequently Asked Questions

1. What are some of the most common challenges faced by Java developers?

Java can run into a few common performance challenges that developers and app owners should be familiar with:

• Memory Leaks
• Slow SQL
• Threading/Synchronization

2. How do I fix Java errors?

• Select Start, click on Settings.
• In the next menu, choose Update & Security, and then click Troubleshoot.
• Select the type of troubleshooting you want to run, then select Run the troubleshooter.
• Allow the troubleshooter to run and then answer any questions on the screen.

3. Why is Java used for Web applications?

Java is the first name that can be used for building complex web applications and for the software platform that used this programming language. It is widely used by development companies to build secure, robust and scalable web applications.

4. How much does it cost to develop a web application?

The cost of web application development is calculated on the basis of features and functionality needs to be integrated within.

Wrapping Up:

Java simplifies a number of things in application development, relying both on JVM and the language itself. But its features, include removing manual memory management or decent OOP tools, don’t address the problems a regular Java developer faces. As always, Java tutorials are the best means to avoid application errors. These hire Java developer knowing libraries, reading JVM documentation, and writing programs. Don’t forget about static code analyzers, as they could point to the actual bugs and possible bugs.