spring cloud Eureka server 问题 Spring Cloud java.lang.TypeNotPresentException
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版本：
spring-cloud.version ： Greenwich.SR2
pom配置：
1 <project xmlns="http://maven.apache.org/POM/4.0.0" 2 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 3 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 4 <modelVersion>4.0.0</modelVersion> 5 <parent> 6 <groupId>org.springframework.boot</groupId> 7 <artifactId>spring-boot-starter-parent</artifactId> 8 <version>2.1.7.RELEASE</version> 9 </parent> 10 <groupId>com.test</groupId> 11 <artifactId>3-spring-eureka-server</artifactId> 12 <version>0.0.1-SNAPSHOT</version> 13 14 <properties> 15 <java.version>1.8</java.version> 16 <spring-cloud.version>Greenwich.SR2</spring-cloud.version> 17 </properties> 18 19 <dependencies> 20 <dependency> 21 <groupId>org.springframework.cloud</groupId> 22 <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> 23 </dependency> 24 <dependency> 25 <groupId>org.springframework.cloud</groupId> 26 <artifactId>spring-cloud-starter-config</artifactId> 27 </dependency> 28 <dependency> 29 <groupId>org.springframework.boot</groupId> 30 <artifactId>spring-boot-starter-test</artifactId> 31 <scope>test</scope> 32 </dependency> 33 34 </dependencies> 35 36 <dependencyManagement> 37 <dependencies> 38 <dependency> 39 <groupId>org.springframework.cloud</groupId> 40 <artifactId>spring-cloud-dependencies</artifactId> 41 <version>$spring-cloud.version</version> 42 <type>pom</type> 43 <scope>import</scope> 44 </dependency> 45 </dependencies> 46 </dependencyManagement> 47 48 <build> 49 <plugins> 50 <plugin> 51 <groupId>org.springframework.boot</groupId> 52 <artifactId>spring-boot-maven-plugin</artifactId> 53 </plugin> 54 </plugins> 55 </build> 56 </project>
application.properties：
spring.application.name=spring-cloud-eureka-server server.port=8761 eureka.instance.hostname=localhost eureka.client.serviceUrl.defaultZone=http://$eureka.instance.hostname:$server.port/eureka/ eureka.client.registerWithEureka=false eureka.client.fetchRegistry=false
启动AppServer：
package com.springtest; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; @EnableEurekaServer @SpringBootApplication public class AppServer public static void main(String[] args) SpringApplication.run(AppServer.class, args);
出现错误信息：
Spring Cloud java.lang.TypeNotPresentException
解决方案如下：
是因为用了jdk12的缘故。因为JAXB-API是java ee的一部分，在jdk12中没有在默认的类路径中。从jdk9开始java引入了模块的概念，可以使用模块命令--add-modles java.xml.bind引入jaxb-api。也可以选择另一种解决方法，在maven里面加入下面依赖，可以解决这个问题：
pom中添加依赖:
<dependency>
<groupId>javax.xml.bind</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.3.0</version>
</dependency>
<dependency>
<groupId>com.sun.xml.bind</groupId>
<artifactId>jaxb-impl</artifactId>
<version>2.3.0</version>
</dependency>
<dependency>
<groupId>org.glassfish.jaxb</groupId>
<artifactId>jaxb-runtime</artifactId>
<version>2.3.0</version>
</dependency>
<dependency>
<groupId>javax.activation</groupId>
<artifactId>activation</artifactId>
<version>1.1.1</version>
</dependency>
最终的Pom.xml 文件如下：
<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-starter-parent</artifactId> <version>2.1.7.RELEASE</version> </parent> <groupId>com.test</groupId> <artifactId>3-spring-eureka-server</artifactId> <version>0.0.1-SNAPSHOT</version> <properties> <java.version>1.8</java.version> <spring-cloud.version>Greenwich.SR2</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-config</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>javax.xml.bind</groupId> <artifactId>jaxb-api</artifactId> <version>2.3.0</version> </dependency> <dependency> <groupId>com.sun.xml.bind</groupId> <artifactId>jaxb-impl</artifactId> <version>2.3.0</version> </dependency> <dependency> <groupId>org.glassfish.jaxb</groupId> <artifactId>jaxb-runtime</artifactId> <version>2.3.0</version> </dependency> <dependency> <groupId>javax.activation</groupId> <artifactId>activation</artifactId> <version>1.1.1</version> </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>
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