无法使用spring boot错误HTTP状态404连接mysql数据库请求的资源不可用
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【中文标题】无法使用spring boot错误HTTP状态404连接mysql数据库请求的资源不可用【英文标题】：cant connect mysql databse using spring boot error HTTP Status 404 the requested resource is not available 【发布时间】：2018-01-27 11:20:15 【问题描述】：下面提到的代码没有使用带有 maven 依赖项的 spring boot 使用 mysql 数据库获取数据。点击 url 后它没有显示任何 json 数据。以前我正在使用 gradle 并且能够连接数据库并给我 json 值。我已将代码从那里复制到 maven 项目，代码中没有错误。任何人都可以帮我解决我做错的地方吗？也请告诉我是否有任何简单的方法可以使代码变得更好，因为我在这方面很天真。
1)在服务器上运行
点击 URL (http://localhost:8080/CheckListMavenWebThree) 会抛出 error 而不是给出 json 值。
让你知道这是 maven Dynamic web 项目
错误 - 在浏览器上显示 HTTP 状态 404 请求的资源不可用/Spring 启动
HTTP Status 404 - /CheckListMavenWebThree/checklist
type Status report
message /CheckListMavenWebThree/checklist
description The requested resource is not available.
Apache Tomcat/7.0.81
当我在 Postman 中点击 url 获取 json 数据时（如下所述显示而不是数据库中的 json 值）
<html>
<head>
<title>Apache Tomcat/7.0.81 - Error report</title>
<style>
<!--H1 font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px; H2 font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px; H3 font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px; BODY font-family:Tahoma,Arial,sans-serif;color:black;background-color:white; B font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76; P font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;A color : black;A.name color : black;HR color : #525D76;-->
</style>
</head>
<body>
<h1>HTTP Status 404 - /CheckListMavenWebThree/</h1>
<HR size="1" noshade="noshade">
<p>
<b>type</b> Status report
</p>
<p>
<b>message</b>
<u>/CheckListMavenWebThree/</u>
</p>
<p>
<b>description</b>
<u>The requested resource is not available.</u>
</p>
<HR size="1" noshade="noshade">
<h3>Apache Tomcat/7.0.81</h3>
</body>
</html>
我很困惑我应该使用项目名称和路径值（在控制器类中提到）如 8080/CheckListMavenWebThree/checklist 或 8080/CheckListMavenWebThree 等这个？
文件结构看起来像 - > 结构：File Structure of my project
@控制器
package com.example.Controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.http.MediaType;
import com.example.Entity.Checklist;
import com.example.Service.CheckListService;
@Controller
public class CheckListController
@Autowired
private CheckListService checkListService;
@RequestMapping(value = "/checklist" , method = RequestMethod.GET)
@ResponseBody
public Object index()
return checkListService.findAll();
@RequestMapping(value = "/create", method = RequestMethod.PUT, consumes = MediaType.APPLICATION_JSON_VALUE)
@ResponseBody
public String create(@RequestBody Checklist checklist)
String userSiteName = "";
try
checkListService.save(checklist);
userSiteName = String.valueOf(checklist.getSite_Name());
System.out.println(userSiteName);
System.out.println(checklist.getWSC_Serial_Number());
System.out.println(checklist.getSetup_Tech());
System.out.println(checklist.getDate());
System.out.println(checklist.getCheckList_01());
System.out.println(checklist.getCheckList_02());
System.out.println(checklist.getCheckList_03());
System.out.println(checklist.getCheckList_04());
System.out.println(checklist.getCheckList_05());
System.out.println(checklist.getCheckList_06());
System.out.println(checklist.getCheckList_07());
System.out.println(checklist.getCheckList_08());
System.out.println(checklist.getCheckList_09());
System.out.println(checklist.getCheckList_10());
System.out.println(checklist.getCheckList_11());
System.out.println(checklist.getCheckList_12());
System.out.println(checklist.getCheckList_13());
System.out.println(checklist.getCheckList_14());
System.out.println(checklist.getNotes());
System.out.println(checklist.getCompleted_By());
System.out.println(checklist.toString());
System.out.println("----------------------------------------------------");
catch(Exception e)
return e.toString();
return userSiteName;
@应用程序主
package com.example.Main;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
@EnableAutoConfiguration
@ComponentScan("com.example")
@EnableJpaRepositories("com.example.Repository")
@SpringBootApplication
@EntityScan(basePackageClasses = com.example.Entity.Checklist.class)
public class SmartRainCheckListApplication
public static void main(String[] args)
SpringApplication.run(SmartRainCheckListApplication.class, args);
@实体
package com.example.Entity;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "checklist")
public class Checklist
public Checklist()
@Column(name = "Site_Name")
private String Site_Name;
@Id
@Column(name = "WSC_Serial_Number")
private Long WSC_Serial_Number;
public Checklist(Long wsc_serial_number)
this.WSC_Serial_Number = wsc_serial_number;
@Column(name = "Setup_Tech")
private String Setup_Tech;
@Column(name = "Date")
private String Date;
@Column(name = "CheckList_01")
private String CheckList_01;
@Column(name = "CheckList_02")
private String CheckList_02;
@Column(name = "CheckList_03")
private String CheckList_03;
@Column(name = "CheckList_04")
private String CheckList_04;
@Column(name = "CheckList_05")
private String CheckList_05;
@Column(name = "CheckList_06")
private String CheckList_06;
@Column(name = "CheckList_07")
private String CheckList_07;
@Column(name = "CheckList_08")
private String CheckList_08;
@Column(name = "CheckList_09")
private String CheckList_09;
@Column(name = "CheckList_10")
private String CheckList_10;
@Column(name = "CheckList_11")
private String CheckList_11;
@Column(name = "CheckList_12")
private String CheckList_12;
@Column(name = "CheckList_13")
private String CheckList_13;
@Column(name = "CheckList_14")
private String CheckList_14;
@Column(name = "Notes")
private String Notes;
@Column(name = "Completed_By")
private String Completed_By;
// public Checklist(String Site_Name, Long WSC_Serial_Number, String
// Setup_Tech, String Date, String CheckList_01,
// String CheckList_02)
// this.Site_Name = Site_Name;
// this.WSC_Serial_Number = WSC_Serial_Number;
// this.Setup_Tech = Setup_Tech;
// this.Date = Date;
// this.CheckList_01 = CheckList_01;
// this.CheckList_02 = CheckList_02;
//
public Checklist(String site_Name, Long wSC_Serial_Number, String setup_Tech, String date, String checkList_01,
String checkList_02, String checkList_03, String checkList_04, String checkList_05, String checkList_06,
String checkList_07, String checkList_08, String checkList_09, String checkList_10, String checkList_11,
String checkList_12, String checkList_13, String checkList_14, String notes, String completed_By)
super();
Site_Name = site_Name;
WSC_Serial_Number = wSC_Serial_Number;
Setup_Tech = setup_Tech;
Date = date;
CheckList_01 = checkList_01;
CheckList_02 = checkList_02;
CheckList_03 = checkList_03;
CheckList_04 = checkList_04;
CheckList_05 = checkList_05;
CheckList_06 = checkList_06;
CheckList_07 = checkList_07;
CheckList_08 = checkList_08;
CheckList_09 = checkList_09;
CheckList_10 = checkList_10;
CheckList_11 = checkList_11;
CheckList_12 = checkList_12;
CheckList_13 = checkList_13;
CheckList_14 = checkList_14;
Notes = notes;
Completed_By = completed_By;
public String getSite_Name()
return Site_Name;
public void setSite_Name(String site_Name)
Site_Name = site_Name;
public Long getWSC_Serial_Number()
return 0 + + WSC_Serial_Number;
public void setWSC_Serial_Number(Long WSC_Serial_Number)
this.WSC_Serial_Number = WSC_Serial_Number;
public String getSetup_Tech()
return Setup_Tech;
public void setSetup_Tech(String setup_Tech)
this.Setup_Tech = setup_Tech;
public String getDate()
return Date;
public void setDate(String date)
this.Date = date;
public String getCheckList_01()
return CheckList_01;
public void setCheckList_01(String CheckList_01)
this.CheckList_01 = CheckList_01;
public String getCheckList_02()
return CheckList_02;
public void setCheckList_02(String CheckList_02)
this.CheckList_02 = CheckList_02;
public String getCheckList_03()
return CheckList_03;
public void setCheckList_03(String checkList_03)
CheckList_03 = checkList_03;
public String getCheckList_04()
return CheckList_04;
public void setCheckList_04(String checkList_04)
CheckList_04 = checkList_04;
public String getCheckList_05()
return CheckList_05;
public void setCheckList_05(String checkList_05)
CheckList_05 = checkList_05;
public String getCheckList_06()
return CheckList_06;
public void setCheckList_06(String checkList_06)
CheckList_06 = checkList_06;
public String getCheckList_07()
return CheckList_07;
public void setCheckList_07(String checkList_07)
CheckList_07 = checkList_07;
public String getCheckList_08()
return CheckList_08;
public void setCheckList_08(String checkList_08)
CheckList_08 = checkList_08;
public String getCheckList_09()
return CheckList_09;
public void setCheckList_09(String checkList_09)
CheckList_09 = checkList_09;
public String getCheckList_10()
return CheckList_10;
public void setCheckList_10(String checkList_10)
CheckList_10 = checkList_10;
public String getCheckList_11()
return CheckList_11;
public void setCheckList_11(String checkList_11)
CheckList_11 = checkList_11;
public String getCheckList_12()
return CheckList_12;
public void setCheckList_12(String checkList_12)
CheckList_12 = checkList_12;
public String getCheckList_13()
return CheckList_13;
public void setCheckList_13(String checkList_13)
CheckList_13 = checkList_13;
public String getCheckList_14()
return CheckList_14;
public void setCheckList_14(String checkList_14)
CheckList_14 = checkList_14;
public String getNotes()
return Notes;
public void setNotes(String notes)
Notes = notes;
public String getCompleted_By()
return Completed_By;
public void setCompleted_By(String completed_By)
Completed_By = completed_By;
@Application.properties
spring.datasource.url=jdbc:mysql://localhost/smartraindb
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
# Keep the connection alive if idle for a long time (needed in production)
spring.datasource.testWhileIdle = true
spring.datasource.validationQuery = SELECT 1
# Show or not log for each sql query
spring.jpa.show-sql = true
# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto = update
# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
# Use spring.jpa.properties.* for Hibernate native properties (the prefix is
# stripped before adding them to the entity manager)
# The SQL dialect makes Hibernate generate better SQL for the chosen database
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
#naming convention according to me
spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
@Pom.xml
<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>CheckListMavenWebThree</groupId>
<artifactId>CheckListMavenWebThree</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.4</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>1.4.7.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-jpa -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<version>1.4.7.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>6.0.6</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<version>1.5.6.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-envers -->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-envers</artifactId>
<version>1.1.6.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-envers -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-envers</artifactId>
<version>5.2.10.Final</version>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
<build>
<testSourceDirectory>src/main/test</testSourceDirectory>
<resources>
<resource>
<directory>src/main/resources</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
<resource>
<directory>src/main/webapp</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
</resources>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>7</version>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.0.0</version>
</plugin>
</plugins>
</build>
</project>
2) 当我尝试不同时，作为 Spring Boot 应用程序运行它抛出错误
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.6.RELEASE)
2017-08-18 12:51:33.066 INFO 56824 --- [ main] c.e.Main.SmartRainCheckListApplication : Starting SmartRainCheckListApplication on H-H-Temp with PID 56824 (C:\Users\keval.shah\Documents\workspace-sts-3.9.0.RELEASE-new\CheckListMavenWebThree\target\classes started by Keval.Shah in C:\Users\keval.shah\Documents\workspace-sts-3.9.0.RELEASE-new\CheckListMavenWebThree)
2017-08-18 12:51:33.068 INFO 56824 --- [ main] c.e.Main.SmartRainCheckListApplication : No active profile set, falling back to default profiles: default
2017-08-18 12:51:33.108 INFO 56824 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@448ff1a8: startup date [Fri Aug 18 12:51:33 MDT 2017]; root of context hierarchy
2017-08-18 12:51:33.827 INFO 56824 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2017-08-18 12:51:34.365 WARN 56824 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is java.lang.NoSuchMethodError: org.apache.tomcat.util.scan.StandardJarScanner.setJarScanFilter(Lorg/apache/tomcat/JarScanFilter;)V
2017-08-18 12:51:34.373 INFO 56824 --- [ main] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-08-18 12:51:34.380 ERROR 56824 --- [ main] o.s.boot.SpringApplication : Application startup failed
org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is java.lang.NoSuchMethodError: org.apache.tomcat.util.scan.StandardJarScanner.setJarScanFilter(Lorg/apache/tomcat/JarScanFilter;)V
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:137) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:537) ~[spring-context-4.3.9.RELEASE.jar:4.3.9.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at com.example.Main.SmartRainCheckListApplication.main(SmartRainCheckListApplication.java:19) [classes/:na]
Caused by: java.lang.NoSuchMethodError: org.apache.tomcat.util.scan.StandardJarScanner.setJarScanFilter(Lorg/apache/tomcat/JarScanFilter;)V
at org.springframework.boot.context.embedded.tomcat.SkipPatternJarScanner$Tomcat8TldSkipSetter.setSkipPattern(SkipPatternJarScanner.java:106) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.context.embedded.tomcat.SkipPatternJarScanner.setPatternToTomcat8SkipFilter(SkipPatternJarScanner.java:61) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.context.embedded.tomcat.SkipPatternJarScanner.<init>(SkipPatternJarScanner.java:56) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.context.embedded.tomcat.SkipPatternJarScanner.apply(SkipPatternJarScanner.java:87) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.prepareContext(TomcatEmbeddedServletContainerFactory.java:209) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory.getEmbeddedServletContainer(TomcatEmbeddedServletContainerFactory.java:178) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:164) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:134) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
... 8 common frames omitted
【问题讨论】：
错误是什么？分享你的 pom.xml 当我点击 url 时，如上所述，无法获取数据（不显示 json 文件）。我还添加了 pom.xml。当我使用 gradle 时，它能够在点击 url 后返回 json 文件。 【参考方案1】：看起来上下文路径 CheckListMavenWebThree 未在您的属性中定义，因此 http://localhost:8080/CheckListMavenWebThree/checklist 会抛出 404。您添加到属性文件中：
server.contextPath=/CheckListMavenWebThree
或者像这样点击你的应用，
http://localhost:8080/checklist
希望对你有帮助
【讨论】：
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