If you are getting the error "Cannot determine embedded servlet container factory class name for web application context" or "No ServletContext set" while trying to start your EmbeddedWebApplicationContext, it may be due to a missing EmbeddedServletContainerFactory bean. This guide will provide you with step-by-step instructions on how to fix this error and start your EmbeddedWebApplicationContext.
Step-by-Step Solution
Step 1: Add the Spring Boot Starter Web Dependency
The first step is to make sure you have the Spring Boot Starter Web dependency in your project. This dependency includes the EmbeddedServletContainerFactory that is needed to start the EmbeddedWebApplicationContext.
To add the dependency to your project, simply add the following line to your pom.xml file:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
Step 2: Define the EmbeddedServletContainerFactory Bean
Next, you need to define the EmbeddedServletContainerFactory bean in your application context. You can do this by adding the following code to your @Configuration class:
@Bean
public EmbeddedServletContainerFactory embeddedServletContainerFactory() {
return new TomcatEmbeddedServletContainerFactory();
}
Note that in this example we are using the TomcatEmbeddedServletContainerFactory, but you can use any other EmbeddedServletContainerFactory implementation that is available in Spring Boot.
Step 3: Start Your EmbeddedWebApplicationContext
Finally, you can start your EmbeddedWebApplicationContext by running the main method of your Spring Boot application class. This should start the web server and you should be able to access your application at the configured port.
FAQ
Q1: Why am I getting the "No ServletContext set" error?
A: This error usually occurs when you are trying to start your EmbeddedWebApplicationContext without having the EmbeddedServletContainerFactory bean defined. Make sure you have followed the steps outlined in this guide to define the EmbeddedServletContainerFactory bean.
Q2: Can I use a different EmbeddedServletContainerFactory implementation?
A: Yes, you can use any other EmbeddedServletContainerFactory implementation that is available in Spring Boot. Simply replace the TomcatEmbeddedServletContainerFactory with the implementation of your choice.
Q3: What is the Spring Boot Starter Web dependency?
A: The Spring Boot Starter Web dependency includes the EmbeddedServletContainerFactory that is needed to start the EmbeddedWebApplicationContext.
Q4: How do I configure the port for my application?
A: You can configure the port for your application by adding the following line to your application.properties file:
server.port=8080
Replace 8080 with the port number of your choice.
Q5: Can I use a different web server instead of the embedded one?
A: Yes, you can use any other web server that is supported by Spring Boot. You will need to add the appropriate dependency to your project and configure it in your application context.