Exception In Thread “Main” Java.Lang.Nullpointerexception – Exception in Java:

Exception in Java: Exception in thread “main” java.lang.nullpointerexception

For those of you fans and actors in the programming area, surely you are familiar with the Java programming language. Java is a programming language that everyone can use and is general. With Java, you can create and develop various applications based on the Java programming language. However, just like in coding and programming, in the use of Java, users will make or find mistakes that usually come from the user itself. One of the errors found is an exception in thread “main” java.lang.nullpointerexception. What kind of error is this? And how to overcome it?

A Glimpse Of Java

Java can be said as a programming language that is fundamental and is most widely used by many people. Java has a syntax that is almost similar to the C and C++ programming languages. However, Java is considered lower in terms of facilities and development. However, Java is widely used by many people because the system is simple and easy to use. If you are just starting to learn about programming, then Java is your right first step.

Java was developed by a computer scientist named James Arthur Gosling. In the process of development, Java is held by the Sun Microsystem company. Java was first issued on May 23, 1995, which means it was 24 years ago as of December 2019. In its journey that has been decades, Java has released various versions of Java according to updates and developments. The latest Java is Java 13, released in September 2019.

Exception in thread “main” java.lang.nullpointerexception, to be used by various programmers and friendly in all applications, Java also develops various Java platforms. Until now, it is known that Java has 5 platforms, namely Java Card, Java Platform – Micro Edition (ME), Java Platform – Standard Edition (SE), Java Platform – Enterprise Edition (EE), and JavaFX. Previously, there was a Personal Java platform but was discontinued.

Exception in Java

As one of the programming languages, Java also has a gap for errors. One error that is usually found is the exception in Java. An exception is an error that can occur when you execute a Java-based program. This error results in the disruption of the application flow to run smoothly and properly. However, you don’t need to worry because this error can be easily resolved if you understand the location of the error.

In general, exceptions occur due to several causes. The cause that is usually the source is a data input error by the programmer, a failure of the connection to the network, a malfunction of the hardware function, a database server down, etc. You need to know that Java is an object-oriented programming language. If the object is found an error or not found, an exception will appear. To overcome this, there are usually 2 methods you can do, namely throwing the exception and catching the exception.


Exception in thread “main” java.lang.nullpointerexception is one of the exceptions that you usually find in Java-based applications. This exception is one type of NullPointerException that will find if an error occurs. This exception is a runtime type exception. This exception arises when you try to develop a program where you also operate in the null position, even though you need an object in that operation.

If you find this exception, you must understand what is the reason for this exception. This type of exception arises usually for 5 reasons. First is you try to invoke methods on an object, but at runtime, the object is null. Second, you try to access various variables in an object, but in the runtime process, the object is also null. The third reason is that you are explicitly throwing a null object into a program. The fourth is that you are trying to access an index or modify a value of an index whose array turns out to be null. The last reason is that you are trying to check the length of an array that is null at runtime.

Detecting the exception in thread “main” java.lang.nullpointerexception is very easy. You can see it in the exception trace. In the exception trace, you will see the class name and line number of the exception that occurred. After that, try to look at the codes and see if they are null. Null is the main cause of NullPointException. The easiest way to overcome this problem is by coding. With the right coding, you will correctly find the problem; you can also solve problems precisely and quickly if you use coding for this problem.