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Spring MVC - Extending AbstractAnnotationConfigDispatcherServletInitializer Examples

Spring MVC 


AbstractAnnotationConfigDispatcherServletInitializer is a base class to initialize Spring application in Servlet container environment. It's an extension of WebApplicationInitializer. The subclasses are supposed to provide the classes annotated with @Configuration, Servlet config classes and DispatcherServlet mapping pattern.


Examples


package com.logicbig.example;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class AppInitializer extends
          AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses () {
        return new Class<?>[]{Config.class};
    }

    @Override
    protected Class<?>[] getServletConfigClasses () {
        return null;
    }

    @Override
    protected String[] getServletMappings () {
        return new String[]{"/"};
    }
}
Original Post




package com.logicbig.example;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class AppInitializer extends
          AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses () {
        return new Class<?>[]{AppConfig.class};
    }

    @Override
    protected Class<?>[] getServletConfigClasses () {
        return null;
    }

    @Override
    protected String[] getServletMappings () {
        return new String[]{"/"};
    }
}
Original Post




package com.logicbig.example;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.servlet.*;
import org.springframework.web.servlet.support.*;

public class AppInitializer extends
          AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses () {
        return new Class<?>[]{AppConfig.class};
    }

    @Override
    protected Class<?>[] getServletConfigClasses () {
        return null;
    }

    @Override
    protected String[] getServletMappings () {
        return new String[]{"/"};
    }

    @Override
    protected FrameworkServlet createDispatcherServlet (WebApplicationContext wac) {
        DispatcherServlet ds = new DispatcherServlet(wac);
        //setting this flag to true will throw NoHandlerFoundException instead of 404 page
        ds.setThrowExceptionIfNoHandlerFound(true);
        return ds;
    }
}




DispatcherServlet#setDetectAllHandlerExceptionResolvers(false) will allow to register only one HandlerExceptionResolver bean with name handlerExceptionResolver 

package com.logicbig.example;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.servlet.*;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class AppInitializer extends
          AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses () {
        return new Class<?>[]{AppConfig.class};
    }

    @Override
    protected Class<?>[] getServletConfigClasses () {
        return null;
    }

    @Override
    protected String[] getServletMappings () {
        return new String[]{"/"};
    }

    @Override
    protected FrameworkServlet createDispatcherServlet (WebApplicationContext wac) {
        DispatcherServlet ds = new DispatcherServlet(wac);
        ds.setDetectAllHandlerExceptionResolvers(false);
        return ds;
    }
}

See Also