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spring cloud Eureka server 问题 Spring Cloud java.lang.TypeNotPresentException

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>

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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

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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);
    }
}

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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>

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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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原文地址：https://www.cnblogs.com/tianciliangen/p/11441935.html