Framework Error

What This Error Means

This error occurs when attempting to instantiate a non-abstract class that is an interface, which is not allowed in Java. In the context of Spring MVC, this typically happens when a view resolver is misconfigured.

Why It Happens

This is because Spring attempts to resolve a view using the provided view name, but the corresponding view class is an interface. This can occur when a developer mistakenly returns an interface instead of a concrete implementation from a view resolver.

How to Fix It

1. 1To fix this error, identify the view resolver that is causing the issue and replace it with a concrete view class. Alternatively, ensure that the view resolver is properly configured to return an instance of the view class. For example, if using a BeanNameViewResolver, configure it to return a concrete BeanViewResolver instead. Update your configuration to include the following code:
2. 2@Bean
3. 3public ViewResolver viewResolver() {
4. 4 return new BeanNameViewResolver();
5. 5}

Example Code Solution

@Bean
public ViewResolver viewResolver() {
    return new BeanNameViewResolver();
}

@Bean
public ViewResolver viewResolver() {
    return new InternalResourceViewResolver();
}