Thread: "A Java Exception has occurred"

Hi everyone! I hope you are doing great

I'm new to both, the forum and JAVA. It's been three or four days since I've started programming in this language (I know C and C++ btw), so I'm a noob/beginner/you name it.

So far, I've learnt how to make graphic applications among other basic staff. The thing is, I've created a program, A VERY BASIC PROGRAM that does simple math calculations and displays the results in a field text. Fortunately, it works pretty well... Buuuuuuuuuuuut if I build it (using netbeans), and try to run it in another computer, a message pops up saying what the title says... How did I solve this? By installing JDK in every single one.

There must be a way to make it work without installing the JDK, but I just don't know how :C Please, I beg you, try to explain me how and as detailed as possible.

Thanks in advance! and sorry if there are too many grammar mistakes, I'm not a native speaker.

--- Update ---

This pops up:

Exception in thread "main" java.lang.NoClassDefFoundError: Calculadora_Porcenta
es/jar
Caused by: java.lang.ClassNotFoundException: Calculadora_Porcentajes.jar
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class: Calculadora_Porcentajes.jar. Program will exit.

And this is my manifest:

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.9.2
Created-By: 1.8.0_11-b12 (Oracle Corporation)
Class-Path:
X-COMMENT: Main-Class will be added automatically by build
Main-Class: calculadora_porcentajes.Calculadora_Porcentajes

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Show us how you are running this code.

The best way to avoid exceptions is to program in a manner which you detect them right before they come. Try to think about every possible situation and consider it. There are ways you can detect those exceptions, with programs, such as checkmarx or a lot others you can use as help.
Good luck with it, Ben.