使用 Spring Boot 和 Spring Cloud 的 ClassNotFoundException
ClassNotFoundException using Spring Boot and Spring Cloud
我正在尝试在 Spring 引导程序中使用来自 Spring Cloud 的功能(例如:Feign 或 Zipkin 客户端)微服务。每当我将 Spring 云依赖项引入 pom.xml 时,我都会在启动时收到以下错误:
java.lang.ClassNotFoundException: com.fasterxml.jackson.core.Versioned
at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_162]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_162]
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[na:1.8.0_162]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_162]
... 36 common frames omitted
下面是导致此问题的示例 pom.xml。我目前在 Spring Boot 2.0.0.RELEASE 和 Spring Cloud Finchley.M8.
我做错了什么?我应该切换到另一个版本的 Spring Cloud 吗?
更新:不是我做错了,甚至 Spring Initializr 项目也证明了这个问题。重现:
- 转到 https://start.spring.io/。
- 输入 Web、JPA 和 Feign 作为依赖项
- 下载项目。
- 在 IDE 中启动(在我的例子中是 Spring Tool Suite),启动时会抛出异常。
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>io.urig</groupId>
<artifactId>inventory</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>inventory</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.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>
<spring-cloud.version>Finchley.M8</spring-cloud.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-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.retry</groupId>
<artifactId>spring-retry</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zipkin</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
原来问题出在损坏的 Maven 包上。删除我的 .m2\repository
文件夹和 运行ning mvn spring-boot:run
下载的依赖项和 运行 我的应用程序解决了这个问题。
我正在尝试在 Spring 引导程序中使用来自 Spring Cloud 的功能(例如:Feign 或 Zipkin 客户端)微服务。每当我将 Spring 云依赖项引入 pom.xml 时,我都会在启动时收到以下错误:
java.lang.ClassNotFoundException: com.fasterxml.jackson.core.Versioned
at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_162]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_162]
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[na:1.8.0_162]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_162]
... 36 common frames omitted
下面是导致此问题的示例 pom.xml。我目前在 Spring Boot 2.0.0.RELEASE 和 Spring Cloud Finchley.M8.
我做错了什么?我应该切换到另一个版本的 Spring Cloud 吗?
更新:不是我做错了,甚至 Spring Initializr 项目也证明了这个问题。重现:
- 转到 https://start.spring.io/。
- 输入 Web、JPA 和 Feign 作为依赖项
- 下载项目。
- 在 IDE 中启动(在我的例子中是 Spring Tool Suite),启动时会抛出异常。
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>io.urig</groupId>
<artifactId>inventory</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>inventory</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.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>
<spring-cloud.version>Finchley.M8</spring-cloud.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-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.retry</groupId>
<artifactId>spring-retry</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zipkin</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
原来问题出在损坏的 Maven 包上。删除我的 .m2\repository
文件夹和 运行ning mvn spring-boot:run
下载的依赖项和 运行 我的应用程序解决了这个问题。