spring boot-Whitelabel 错误页面答案

【问题标题】：spring boot-Whitelabel Error Pagespring boot-Whitelabel 错误页面
【发布时间】：2017-06-03 23:46:33
【问题描述】：

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;


@SpringBootApplication(exclude = SecurityAutoConfiguration.class)
@ComponentScan
public class SpringbootdemoApplication {

    public static void main(String[] args) 
    {
        SpringApplication.run(SpringbootdemoApplication.class, args);
    }
}

控制器：

package com.example.controller;
import java.util.ArrayList;
import java.util.List;

import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.example.module.*;


@RestController
public class EmployeeController 
{
    @RequestMapping(value="/getemp", method = RequestMethod.GET)
    public List<Employee> getEmployees() 
    {
        List<Employee> employeesList = new ArrayList<Employee>();
        employeesList.add(new Employee(1,"lokesh","gupta","howtodoinjava@gmail.com"));
        return employeesList;
    }
}

豆子：

package com.example.module;

public class Employee {

    public Employee() {

    }
    public Employee(Integer id, String firstName, String lastName, String email) {
        super();
        this.id = id;
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
    }

    private Integer id;
    private String firstName;
    private String lastName;
    private String email;

    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getFirstName() {
        return firstName;
    }
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
    public String getLastName() {
        return lastName;
    }
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "Employee [id=" + id + ", firstName=" + firstName
                + ", lastName=" + lastName + ", email=" + email + "]";
    }
}

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.example.demo</groupId>
    <artifactId>springbootdemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springbootdemo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-hateoas</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jersey</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.hsqldb</groupId>
            <artifactId>hsqldb</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

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

错误：白标错误页面

此应用程序没有显式映射 /error，因此您将其视为后备。

2017 年 1 月 19 日星期四 15:27:39 IST 出现意外错误（类型=未找到，状态=404）。没有可用的消息

我是spring boot的新手。请帮我解决这个错误

【问题讨论】：

尝试删除@ComponentScan 并发布结果

标签： java spring spring-boot

【解决方案1】：

这是因为 Spring Boot 扫描包 com.example.demo 下的包。将EmployeeController的包名由com.example.controller改为com.example.demo.controller

【讨论】：

【解决方案2】：

我认为问题与@ComponentScan 和包装有关。如果未定义特定的包，则将从声明此注解的类的包中进行扫描。尝试将您的班级 SpringbootdemoApplication 的包更改为：

package com.example.demo;

...到这个：

package com.example;

【讨论】：

【解决方案3】：

你不再需要@ComponentScan，因为它已经进入@SpringBootApplication

另一方面，错误与您没有提供回退到应用程序root context / 的事实有关

【讨论】：