Spring MVC & Maven Integration

Question

I'm trying to build a Spring MVC project and am having some troubles trying to resolve the follow error.

HTTP Status 500 - Circular view path [login]: would dispatch back to the current handler URL [/login] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.)

I entered the following commands via Terminal:

mvn clean package
java -jar target/sprint2-0.1.0.jar

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.teamvirus.src</groupId>
    <artifactId>sprint2</artifactId>
    <version>0.1.0</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>0.5.0.M6</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--><dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf-spring3</artifactId>
        </dependency>-->

    </dependencies>

    <properties>
        <start-class>com.teamvirus.src.Application</start-class>
    </properties>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestone</id>
            <url>http://repo.spring.io/libs-milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-milestone</id>
            <url>http://repo.spring.io/libs-milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

</project>

LoginController.java

package com.teamvirus.src;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

@Controller
public class LoginController {
    @RequestMapping("/login")
    public String login() {
        return "login";
    }

    @RequestMapping("/authenticate")
    public String authenticate(
            @RequestParam(value = "username", required = true) String username,
            @RequestParam(value = "password", required = true) String password) {
        if ((username.equals("admin") && password.equals("admin")))
            return "redirect:dashboard?username=" + username;
        else if ((username.equals("student1") && password.equals("student1"))) {
            return "redirect:dashboard?username=" + username;
        }
        return "wrongpassword";
    }
}

Appreciate any assistance rendered.

Edit:

Application.java

package com.teamvirus.src;

import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.SpringApplication;
import org.springframework.context.annotation.ComponentScan;

@ComponentScan
@EnableAutoConfiguration
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Answer 1

You are entirely relying on Spring Boot to configure everything, although this shouldn't be a problem for your current view it is.

By default Spring boot registers an InternalResourceViewResolver however without any prefix/suffixes. (See the source). Assuming you have your views in /WEB-INF/views and they are jsp files do the following

1. In src\main\resources add an application.properties file
2. Add a property spring.view.prefix with the value /WEB-INF/views/
3. Add a property spring.view.suffix with the value `.jsp'

Repackage and start your application.

If you don't have this additional configuration /login will lead back to /login which will lead back to /login which will lead back to /login which will... Well you get the picture I guess. (login is the name of the view you are referring to from your @Controller).

Answer 2

Do you have a view resolver? Try to add

<bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix">
            <value>/WEB-INF/pages/</value>
        </property>
        <property name="suffix">
            <value>.jsp</value>
        </property>
    </bean>

so when you return "login" it will search and load the jsp inside /WEB-INF/pages/ with name login.jsp. Without view resolver it will call your controller method again.