Troubleshooting: How to Resolve 'Editor Does Not Contain a Main Type' Error

As a developer, you may encounter the error message "Editor does not contain a main type" while working on Java projects. This error occurs when the Java compiler cannot find the main class in your project. This guide will provide a step-by-step solution to resolve the "Editor does not contain a main type" error.

Solution

Step 1: Check for the main class

The main class is the entry point of your Java program. Ensure that the main class is present in your project. To check for the main class, follow these steps:

1. Open the project in your preferred Java IDE.
2. Go to the project explorer and expand the source folder.
3. Look for a Java file with the main method. The main method should look like this:

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

1. If you cannot find a Java file with the main method, create a new one and add the main method.

Step 2: Set the main class

Next, you need to set the main class in your project. To set the main class, follow these steps:

1. Right-click on the project in the project explorer.
2. Select "Properties" from the context menu.
3. Go to the "Run/Debug Settings" tab.
4. Click on "New" to create a new configuration.
5. Select "Java Application" and click "OK".
6. In the "Main" tab, select the main class from the project.
7. Click "Apply" and "OK" to save the changes.

Step 3: Clean and rebuild the project

After setting the main class, you need to clean and rebuild the project. To clean and rebuild the project, follow these steps:

1. Go to the "Project" menu.
2. Click on "Clean" to clean the project.
3. Go to the "Project" menu again.
4. Click on "Build Project" to rebuild the project.

FAQ

Q1: What causes the "Editor does not contain a main type" error?

A: This error occurs when the Java compiler cannot find the main class in your project.

Q2: How do I check for the main class in my Java project?

A: Open the project in your preferred Java IDE and look for a Java file with the main method.

Q3: How do I set the main class in my Java project?

A: Right-click on the project in the project explorer, select "Properties", go to the "Run/Debug Settings" tab, and set the main class in the "Main" tab.

Q4: What should I do if I cannot find a Java file with the main method?

A: Create a new Java file and add the main method.

Q5: Why do I need to clean and rebuild the project?

A: Cleaning and rebuilding the project ensures that the changes you made are compiled correctly and that the project is up-to-date.

Related Links

• Java Main Method
• Java Build Tools
• Java Debugging