Top Java Software Errors: 50 Common Java Errors and How to Avoid Them

STACKIFYJUNE 15, 2017DEVELOPER TIPS, TRICKS & RESOURCES, INSIGHTS FOR DEV MANAGERS

There are many types of errors that could be encountered while developing Java software, from, but most are avoidable. We’ve rounded up 50 of the most common Java software errors, complete with code examples and tutorials to help you work around common coding problems.

For more tips and tricks for coding better Java programs, download our Comprehensive Java Developer’s Guide, which is jam-packed with everything you need to up your Java game – from tools to the best websites and blogs, YouTube channels, Twitter influencers, LinkedIn groups, podcasts, must-attend events, and more.

If you’re working with.NET, you should also check out our guide to the 50 most common.NET software errors and how to avoid them. But if your current challenges are Java-related, read on to learn about the most common issues and their workarounds.

Compiler Errors

Compiler error messages are created when the Java software code is run through the compiler. It is important to remember that a compiler may throw many error messages for one error. So fix the first error and recompile. That could solve many problems.

1. "… expected"

This error occurs when something is missing from the code. Often this is created by a missing semicolon or closing parenthesis.

private static double volume(String solidom, double alturam, double areaBasem, double raiom) {

double vol;

if (solidom.equalsIgnoreCase("esfera"){

vol=(4.0/3)*Math.pi*Math.pow(raiom,3);

}

else {

if (solidom.equalsIgnoreCase("cilindro") {

vol=Math.pi*Math.pow(raiom,2)*alturam;

}

else {

vol=(1.0/3)*Math.pi*Math.pow(raiom,2)*alturam;

}

}

return vol;

}

Often this error message does not pinpoint the exact location of the issue. To find it:

Make sure all opening parenthesis have a corresponding closing parenthesis.

Look in the line previous to the Java code line indicated. This Java software error doesn’t get noticed by the compiler until further in the code.

Sometimes a character such as an opening parenthesis shouldn’t be in the Java code in the first place. So the developer didn’t place a closing parenthesis to balance the parentheses.

Check out an example of how a missed parenthesis can create an error (@StackOverflow).

2. "unclosed string literal"

The "unclosed string literal" error message is created when the string literal ends without quotation marks, and the message will appear on the same line as the error. (@DreamInCode) A literal is a source code of a value.

public abstract class NFLPlayersReference {

private static Runningback[] nflplayersreference;

private static Quarterback[] players;

private static WideReceiver[] nflplayers;

public static void main(String args[]){

Runningback r = new Runningback("Thomlinsion");

Quarterback q = new Quarterback("Tom Brady");

WideReceiver w = new WideReceiver("Steve Smith");

NFLPlayersReference[] NFLPlayersReference;

Run();// {

NFLPlayersReference = new NFLPlayersReference [3];

nflplayersreference[0] = r;

players[1] = q;

nflplayers[2] = w;

for ( int i = 0; i

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