Spring Boot旧项目改造中，不继承parent改用dependency时报的错误

最新推荐文章于 2024-06-16 09:43:29 发布

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最新推荐文章于 2024-06-16 09:43:29 发布

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原文链接：https://my.oschina.net/wangchen881202/blog/755036

本文通过一个具体的示例，讲述了如何解决SpringBoot项目中因Maven父级POM与Spring Boot依赖版本不一致导致的运行时错误。并详细记录了从发现问题到解决问题的全过程。

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狗血一样的剧情，丢人事迹写成博客，检讨自己，提示后人。

剧情是这样：

公司有一套自己的parent POM，用以统一各系统的依赖，所以就不方便采用Spring Boot的继承方式了，也就是如下的方式：

<?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>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-dependencies</artifactId>
		<version>1.3.8.RELEASE</version>
	</parent>

	<groupId>com.aaa.bbb</groupId>
	<artifactId>aaa-bbb</artifactId>
	<packaging>jar</packaging>
	<version>1.0.0-SNAPSHOT</version>
	<name>aaa-bbb</name>

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

</project>

根据实际项目需要，得将POM文件改为如下依赖的写法：

<?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>

	<parent>
		<groupId>aaa-bbb</groupId>
		<artifactId>aaa-bbb-parent</artifactId>
		<version>2.0-SNAPSHOT</version>
	</parent>

	<groupId>com.aaa.bbb</groupId>
	<artifactId>aaa-bbb</artifactId>
	<packaging>jar</packaging>
	<version>1.0.0-SNAPSHOT</version>
	<name>aaa-bbb</name>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<!-- Import dependency management from Spring Boot -->
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-dependencies</artifactId>
				<version>1.3.8.RELEASE</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

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

</project>

为了方便解释问题，也把这个DEMO中唯一的Java类贴出来（Java类中没错误）：

package com.aaa.bbb;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
@EnableAutoConfiguration
public class SampleController {

	@RequestMapping("/")
	@ResponseBody
	String home() {
		return "Hello World!";
	}

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

但是实际写的过程中，一直出现如下的这个错误：

Exception in thread "main" java.lang.IllegalArgumentException: Cannot instantiate interface org.springframework.context.ApplicationListener : org.springframework.boot.logging.ClasspathLoggingApplicationListener
	at org.springframework.boot.SpringApplication.createSpringFactoriesInstances(SpringApplication.java:413)
	at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:393)
	at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:384)
	at org.springframework.boot.SpringApplication.initialize(SpringApplication.java:262)
	at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:236)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1185)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1174)
	at com.turing.log2.SampleController.main(SampleController.java:20)
Caused by: java.lang.NoClassDefFoundError: org/springframework/context/event/GenericApplicationListener
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(Unknown Source)
	at java.security.SecureClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.defineClass(Unknown Source)
	at java.net.URLClassLoader.access$100(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at org.springframework.util.ClassUtils.forName(ClassUtils.java:249)
	at org.springframework.boot.SpringApplication.createSpringFactoriesInstances(SpringApplication.java:406)
	... 7 more
Caused by: java.lang.ClassNotFoundException: org.springframework.context.event.GenericApplicationListener
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	... 21 more

查了半天，才突然意识到问题，于是我对比了一下spring-boot的对spring依赖的版本号：

Spring Boot 1.3.8.RELEASE 对应是 Spring 4.2.8.RELEASE，

而我公司的parent中，spring版本统一为4.1.7.RELEASE。

和JDK版本，DEMO搭建等等均没关系，这些时间花费的太冤枉了……小黑屋见……

转载于:https://my.oschina.net/wangchen881202/blog/755036