JAXB ClassNotFoundException使用Java 11构建Spring Boot App 2.2.0

时间：2018-12-30 14:51:55

标签： spring-boot jaxb

我已经使用2.2.0版创建了一个Spring Boot应用程序.BUILD-SNAPSHOT和Java 11（以下是POM）：

 <?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-starter-parent</artifactId>
    <version>2.2.0.BUILD-SNAPSHOT</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.mycompany</groupId>
<artifactId>Eureka-Service</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>Eureka-Service</name>
<description>Spring Boot Eureka Service</description>

<properties>
    <java.version>11</java.version>
    <spring-cloud.version>Greenwich.BUILD-SNAPSHOT</spring-cloud.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>javax.xml.bind</groupId>
        <artifactId>jaxb-api</artifactId>
        <version>2.3.1</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>

<repositories>
    <repository>
        <id>spring-snapshots</id>
        <name>Spring Snapshots</name>
        <url>https://repo.spring.io/snapshot</url>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </repository>
    <repository>
        <id>spring-milestones</id>
        <name>Spring Milestones</name>
        <url>https://repo.spring.io/milestone</url>
    </repository>
</repositories>
<pluginRepositories>
    <pluginRepository>
        <id>spring-snapshots</id>
        <name>Spring Snapshots</name>
        <url>https://repo.spring.io/snapshot</url>
        <snapshots>
            <enabled>true</enabled>
        </snapshots>
    </pluginRepository>
    <pluginRepository>
        <id>spring-milestones</id>
        <name>Spring Milestones</name>
        <url>https://repo.spring.io/milestone</url>
    </pluginRepository>
</pluginRepositories>
</project>

应用启动时，会引发以下异常：

2018-12-30 14:09:43.584  INFO 1305 --- [           main] 
    c.n.d.provider.DiscoveryJerseyProvider   : Using XML encoding codec 
   XStreamXml
   2018-12-30 14:09:43.584  INFO 1305 --- [           main] 
   c.n.d.provider.DiscoveryJerseyProvider   : Using XML decoding codec 
    XStreamXml
    2018-12-30 14:09:43.710 ERROR 1305 --- [           main] c.s.j.s.i.w.WadlApplicationContextImpl   : Implementation of JAXB-API has not been found on module path or classpath.

javax.xml.bind.JAXBException: Implementation of JAXB-API has not been found on module path or classpath.
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:177) ~[jaxb-api-2.3.1.jar:2.3.0]
    at javax.xml.bind.ContextFinder.find(ContextFinder.java:364) ~[jaxb-api-2.3.1.jar:2.3.0]
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:508) ~[jaxb-api-2.3.1.jar:2.3.0]
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:465) ~[jaxb-api-2.3.1.jar:2.3.0]
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:366) ~[jaxb-api-2.3.1.jar:2.3.0]
    at com.sun.jersey.server.impl.wadl.WadlApplicationContextImpl.<init>(WadlApplicationContextImpl.java:107) ~[jersey-server-1.19.1.jar:1.19.1]
    at com.sun.jersey.server.impl.wadl.WadlFactory.init(WadlFactory.java:100) ~[jersey-server-1.19.1.jar:1.19.1]
    at com.sun.jersey.server.impl.application.RootResourceUriRules.initWadl(RootResourceUriRules.java:169) ~[jersey-server-1.19.1.jar:1.19.1]
    at com.sun.jersey.server.impl.application.RootResourceUriRules.<init>(RootResourceUriRules.java:106) ~[jersey-server-1.19.1.jar:1.19.1]
    at com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1359) ~[jersey-server-1.19.1.jar:1.19.1]
    at com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:180) ~[jersey-server-1.19.1.jar:1.19.1]
    at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:799) ~[jersey-server-1.19.1.jar:1.19.1]
    at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:795) ~[jersey-server-1.19.1.jar:1.19.1]
    at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193) ~[jersey-core-1.19.1.jar:1.19.1]
    at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:795) ~[jersey-server-1.19.1.jar:1.19.1]
    at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:790) ~[jersey-server-1.19.1.jar:1.19.1]
    at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:509) ~[jersey-servlet-1.19.1.jar:1.19.1]
    at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:339) ~[jersey-servlet-1.19.1.jar:1.19.1]
    at com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:605) ~[jersey-servlet-1.19.1.jar:1.19.1]
    at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:207) ~[jersey-servlet-1.19.1.jar:1.19.1]
    at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:394) ~[jersey-servlet-1.19.1.jar:1.19.1]
    at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:744) ~[jersey-servlet-1.19.1.jar:1.19.1]
    at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:270) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:106) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4511) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5157) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1382) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1372) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na]
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:907) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:831) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1382) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1372) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
    at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140) ~[na:na]
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:907) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:423) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:933) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.apache.catalina.startup.Tomcat.start(Tomcat.java:398) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:106) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:86) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
    at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:414) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
    at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:174) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:181) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:154) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:540) ~[spring-context-5.1.4.BUILD-SNAPSHOT.jar:5.1.4.BUILD-SNAPSHOT]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
    at com.orbis.EurekaServiceApplication.main(EurekaServiceApplication.java:13) ~[classes/:na]
Caused by: java.lang.ClassNotFoundException: com.sun.xml.internal.bind.v2.ContextFactory
    at org.springframework.boot.web.embedded.tomcat.TomcatEmbeddedWebappClassLoader.loadClass(TomcatEmbeddedWebappClassLoader.java:70) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1173) ~[tomcat-embed-core-9.0.14.jar:9.0.14]
    at javax.xml.bind.ServiceLoaderUtil.nullSafeLoadClass(ServiceLoaderUtil.java:122) ~[jaxb-api-2.3.1.jar:2.3.0]
    at javax.xml.bind.ServiceLoaderUtil.safeLoadClass(ServiceLoaderUtil.java:155) ~[jaxb-api-2.3.1.jar:2.3.0]
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:174) ~[jaxb-api-2.3.1.jar:2.3.0]
    ... 61 common frames omitted

2018-12-30 14:09:43.790  WARN 1305 --- [           main] o.s.c.n.a.ArchaiusAutoConfiguration      : No spring.application.name found, defaulting to 'application'
2018-12-30 14:09:43.790  WARN 1305 --- [           main] c.n.c.sources.URLConfigurationSource     : No URLs will be polled as dynamic configuration sources.
2018-12-30 14:09:43.791  INFO 1305 --- [           main] c.n.c.sources.URLConfigurationSource     : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.
2018-12-30 14:09:43.922  INFO 1305 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2018-12-30 14:09:44.330  INFO 1305 --- [           main] o.s.c.n.eureka.InstanceInfoFactory       : Setting initial instance status as: STARTING
2018-12-30 14:09:44.368  INFO 1305 --- [           main] com.netflix.discovery.DiscoveryClient    : Initializing Eureka in region us-east-1
2018-12-30 14:09:44.368  INFO 1305 --- [           main] com.netflix.discovery.DiscoveryClient    : Client configured to neither register nor query for data.
2018-12-30 14:09:44.378  INFO 1305 --- [           main] com.netflix.discovery.DiscoveryClient    : Discovery Client initialized at timestamp 1546178984375 with initial instances count: 0
2018-12-30 14:09:44.405  INFO 1305 --- [           main] c.n.eureka.DefaultEurekaServerContext    : Initializing ...
2018-12-30 14:09:44.406  INFO 1305 --- [           main] c.n.eureka.cluster.PeerEurekaNodes       : Adding new peer nodes [http://localhost:8761/eureka/]
2018-12-30 14:09:44.583  INFO 1305 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON encoding codec LegacyJacksonJson
2018-12-30 14:09:44.584  INFO 1305 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON decoding codec LegacyJacksonJson
2018-12-30 14:09:44.584  INFO 1305 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using XML encoding codec XStreamXml
2018-12-30 14:09:44.584  INFO 1305 --- [           main] c.n.d.provider.DiscoveryJerseyProvider   : Using XML decoding codec XStreamXml
2018-12-30 14:09:44.668  INFO 1305 --- [           main] c.n.eureka.cluster.PeerEurekaNodes       : Replica node URL:  http://localhost:8761/eureka/
2018-12-30 14:09:44.675  INFO 1305 --- [           main] c.n.e.registry.AbstractInstanceRegistry  : Finished initializing remote region registries. All known remote regions: []
2018-12-30 14:09:44.675  INFO 1305 --- [           main] c.n.eureka.DefaultEurekaServerContext    : Initialized
2018-12-30 14:09:44.682  INFO 1305 --- [           main] o.s.b.a.e.web.EndpointLinksResolver      : Exposing 2 endpoint(s) beneath base path '/actuator'
2018-12-30 14:09:44.741  INFO 1305 --- [           main] o.s.c.n.e.s.EurekaServiceRegistry        : Registering application UNKNOWN with eureka with status UP
2018-12-30 14:09:44.744  INFO 1305 --- [      Thread-12] o.s.c.n.e.server.EurekaServerBootstrap   : Setting the eureka configuration..
2018-12-30 14:09:44.745  INFO 1305 --- [      Thread-12] o.s.c.n.e.server.EurekaServerBootstrap   : Eureka data center value eureka.datacenter is not set, defaulting to default
2018-12-30 14:09:44.745  INFO 1305 --- [      Thread-12] o.s.c.n.e.server.EurekaServerBootstrap   : Eureka environment value eureka.environment is not set, defaulting to test
2018-12-30 14:09:44.754  INFO 1305 --- [      Thread-12] o.s.c.n.e.server.EurekaServerBootstrap   : isAws returned false
2018-12-30 14:09:44.755  INFO 1305 --- [      Thread-12] o.s.c.n.e.server.EurekaServerBootstrap   : Initialized server context
2018-12-30 14:09:44.755  INFO 1305 --- [      Thread-12] c.n.e.r.PeerAwareInstanceRegistryImpl    : Got 1 instances from neighboring DS node
2018-12-30 14:09:44.755  INFO 1305 --- [      Thread-12] c.n.e.r.PeerAwareInstanceRegistryImpl    : Renew threshold is: 1
2018-12-30 14:09:44.755  INFO 1305 --- [      Thread-12] c.n.e.r.PeerAwareInstanceRegistryImpl    : Changing status to UP
2018-12-30 14:09:44.761  INFO 1305 --- [      Thread-12] e.s.EurekaServerInitializerConfiguration : Started Eureka Server
2018-12-30 14:09:44.775  INFO 1305 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8761 (http) with context path ''
2018-12-30 14:09:44.775  INFO 1305 --- [           main] .s.c.n.e.s.EurekaAutoServiceRegistration : Updating port to 8761
2018-12-30 14:09:44.777  INFO 1305 --- [           main] com.orbis.EurekaServiceApplication       : Started EurekaServiceApplication in 4.097 seconds (JVM running for 5.186)
2018-12-30 14:10:44.762  INFO 1305 --- [a-EvictionTimer] c.n.e.registry.AbstractInstanceRegistry  : Running the evict task with compensationTime 0msaa

但是，当我删除以下依赖项时：

<dependency>
        <groupId>javax.xml.bind</groupId>
        <artifactId>jaxb-api</artifactId>
        <version>2.3.1</version>
    </dependency>

应用程序无法启动：

Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:125) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:86) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:414) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:174) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:181) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:154) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
... 8 common frames omitted
Caused by: java.lang.IllegalStateException: StandardEngine[Tomcat].StandardHost[localhost].TomcatEmbeddedContext[] failed to start
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.rethrowDeferredStartupExceptions(TomcatWebServer.java:171) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:109) ~[spring-boot-2.2.0.BUILD-SNAPSHOT.jar:2.2.0.BUILD-SNAPSHOT]
... 13 common frames omitted

1 个答案:

答案 0 :(得分：3)

从Java 9开始，JAXB实现已被删除。因此，您添加的只是API，还需要添加实现。可能有几种选择。

作为一种解决方法，您可以添加-例如，我猜还有其他实现方式-这种依赖关系：

<dependency>
    <groupId>org.eclipse.persistence</groupId>
    <artifactId>org.eclipse.persistence.moxy</artifactId>
    <version>2.7.3</version>
</dependency>

Here是对此的很好解释。

为什么将其删除（摘自上面的链接）：

  

Java的标准库并不十分小巧轻便。在过去20多年的过程中，已经添加了许多功能，主要是因为当时人们认为，如果Java支持现成的特定技术将是一个好主意。

     

其中之一是对基于XML的Web服务的支持。当Java SE 6在2006年12月发布时，基于XML的Web服务开始流行，因此Java语言的开发人员认为，如果Java支持将Web服务作为标准功能来支持，那将是一个好主意。决定将必要的API（最初作为Java EE的一部分开发）添加到Java SE。其中包括JAX-WS（基于XML的Web服务的Java API）和JAXB。

     

随着当今微服务的趋势，重要的是Java运行时环境必须小巧轻便，因此拥有一个内置的对每种可能技术的支持的大型运行时库已不再具有优势。

     

因此，在JEP-320中提出了从JDK中删除Java EE和CORBA模块的建议。

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