Selection does not contain a main type eclipse ошибка

The Eclipse editor does not contain a main type sts and displays a mistake in your program when the Java file is not linked to the main class and source. Consequently, the Java program throws a code exception that obliterates your programming experience because there are no recent launches Eclipse Java.

So, we wrote the detailed debugging main type guide, including advanced solutions and real-life instances we encounter daily. In addition, we will explain why the file in this editor is not runnable and blocks further code alterations and procedures.

Why Is the Eclipse Editor Does Not Contain a Main Type Bug Happening?

The selection does not contain a main type” – Eclipse Scala error happens when the Java file is not linked to the primary source. In addition, we have encountered the same exception when forgetting to declare the primary method in the program or application.

Unfortunately, you could not find or load main class Eclipse when the build path is located in the same folder you are working on. As you can tell, many possible culprits that force your program to display the error exist, especially in complex projects or applications.

The selection does not contain a main type and blocks further code alterations by affecting the classes and preventing the editor from carrying out the intended processes. Henceforth, editor could not be initialized. in Eclipse, which can discourage you and ruin your programming experience after spending weeks working on the same project.

Although we could list other instances for the selection does not contain a field Eclipse error, we will focus on the most typical causes. Fortunately, the debugging approaches solve all scripts and programs irrelevant to your application’s purposes and procedures.

In addition, the solutions are easy to replicate and reuse in your document, which is excellent when wanting to complete your forgotten project. First, we will help you recreate the exception using standard procedures to help you troubleshoot the document and pinpoint the cause.

– The Main Method Is Missing From the Program

This article’s first broken chapter explains why a missing primary method from your program launches the incorrect code exception. Unfortunately, this is the most typical culprit for the bug, which usually affects programs without correct procedures.

So, the error appears when your syntax fails to interpret the existing class and read the primary method, confusing the application and launching an error. Although the absence does not affect other elements and processes, it can halt the program until removing the code exception.

Consequently, the system runs the program with interruptions and obstacles, ruining your developing or programming experience. In addition, learning about this cause does not require complex elements and tags so we will focus on the primary function.

Namely, we will show you a short code snippet with a single class that forces your application to display an invalid message.

The following example provides the Java code ruining your program:

This sample throws a mistake even after putting the property in a project folder with a good name. So, Eclipse has built-in Java properties, and Ubuntu is 64-bit, which is the perfect programming environment. Unfortunately, downloading the Eclipse Kepler file messes up the inputs that should launch the correct primary function.

But again, stay calm, although your document has different inputs, because each syntax is unique. Namely, the debugging methods solve the inconsistencies in each code snippet, although isolating the script is beneficial.

– Including an Undefined Build Path

The second broken instance launching this code exception and ruining your program includes undefined build paths. Namely, this is the second most common reason for the error, although we confirmed it in almost every failed property or Eclipse project on Java.

So, this cause revolves around the functions of the build path, which must have precise inputs and properties to render the functions and commands. Therefore, forgetting to set or misspell the functional build path’s location where the Java project exists, results in the annoying message confirming this error.

An adequate script that recreates this cause and displays the error does not exist because you must make changes inside the program. However, we encountered several scripts that launched the mistake from the same root, which we are willing to share.

For example, the application suggests programmers set the build path to the source folder of your leading directory because it represents the primary source for all procedures. In addition, it contains all program files and is designed to act as the default build path of every Java program or Eclipse project.

As a result, forgetting to set the correct location or misspelling the exact path blocks your program’s functions and halts further procedures. Luckily, the solutions we will explain and exemplify will not affect other elements and tags, although we suggest making the changes in a separate document.

In addition, the step-by-step debugging approaches should work for all versions because we confirmed the error in old and new programs.

Fix the Eclipse Editor Does Not Contain a Main Type: Common Methods

You can fix the eclipse editor does not contain a main type error by checking if you have the main method and, if not, providing the primary method. Additionally, you must place the command inside the class, completing the process. Furthermore, you can create a correct source folder.

As you can tell, all debugging principles revolve around the same code snippet containing essential values and properties.

Therefore, this chapter teaches you how to provide the build path in the correct source folder and fix the location. Luckily, the process consists of a few standard steps that are easy to replicate and implement in your program.

You can learn more about the quick solution in the following numbered list:

1. Navigate to the project’s folder and right-click it
2. Select the Properties tab
3. Click on the Java Build Path that should pop up
4. Locate and select the Sources tab on the top
5. Create a new folder by clicking the Add Folder option on the right panel
6. Select the folder and apply the changes

This list helps you create a specific source folder the system uses to launch the build path and avoid mistakes. As you can tell, these changes have nothing in common with the project’s script or syntax, and all the alterations you make, affect the program and its properties.

Henceforth, you can ensure nothing wrong happens to the other elements and values, keeping your application safe when applying the debugging approaches. Luckily, this is one of the many solutions you can use to fix the editor error and correct your program.

– Explicitly Adding the Main Method

This guide’s second debugging approach teaches you how to add the primary method explicitly to prevent further complications. As explained and confirmed in the former chapter, the system displays an error when forgetting to mention the leading practice in the application.

Henceforth, you can implement it into the Java class after troubleshooting the syntax and ensuring this is the property you lack. This solution requires specific changes to the script or additions you can quickly make.

The following code snippet exemplifies the script you must add to your document:

Although you can change the values inside the print-in property to fit your application’s needs, the alterations will not affect the solution. Pasting the answer in the correct Java class is the only thing you must take care of because it can affect secondary processes.

For example, always introduce this command to the Java class lacking the primary method and blocking your code.

Conclusion

The Eclipse editor does not contain a main type and displays an error when the Java file is not linked to the source. Considering the sensitivity of the situation, we wrote this detailed debugging guide to help you remove the bug, so let’s summarize the facts:

• A missing main method can cause the issue in all Java projects
• You can recreate the code exception by including an undefined build path
• Remember to apply the leading method approach inside the program
• The primary build path has all your project’s Java files

After applying the solutions, you will fix your application and remove this annoying warning message. In addition, you will make the script future-proof due to the correct path.

Problem Description:

I am trying to run some java files in a new project. So I make the project, put the files in it and I try to run the main file so my game starts.

I get an error that says selection does not contain a main type.

I have tried several ways to run it:

• Some say to launch eclipse again, tried this a dozen times.
• Somewhere else someone pointed to open a new project and make a build path to the old project.

Didn’t work either.

I am pretty sure it must work because I ran it a few hours ago at school. How do I get this working? Thank you in advance!

Solution – 1

The entry point for Java programs is the method:

public static void main(String[] args) {
    //Code
}

If you do not have this, your program will not run.

Solution – 2

I hope you are trying to run the main class in this way, see screenshot: