正如官方文件所述:

升级时，您可能会面临以下问题: java.lang.NoClassDefFoundError: javax / xml /绑定/ JAXBException Hibernate通常需要缺省情况下不再提供的JAXB。你可以 在Java9中添加java.xml.bind模块来恢复此功能 或Java10(即使该模块已弃用)。 从Java11开始，该模块不可用，所以您唯一的选择是 添加JAXB RI(您可以在Java9中这样做，以代替添加 java.xml.bind模块:

Maven

<dependency>
    <groupId>org.glassfish.jaxb</groupId>
    <artifactId>jaxb-runtime</artifactId>
</dependency>

Gradle （build.gradle.kts）：

implementation("org.glassfish.jaxb:jaxb-runtime")

Gradle build.gradle)

implementation 'org.glassfish.jaxb:jaxb-runtime'

如果你想指定一个特定的版本，看看这里: https://mvnrepository.com/artifact/org.glassfish.jaxb/jaxb-runtime

对于我来说，Eclipse 2020-12(4.18.0)正在使用inbuild (org.eclipse.justj.openjdk.hotspot.jre.full.win32.x86_64_15.0.1.v20201027-0507\jre)

在安装的JREs(这是我想要的)中将java更新到1.8后解决了这个问题。

希望能有所帮助。

2019年4月更新

JAXB版本的Changelong在https://javaee.github.io/jaxb-v2/doc/user-guide/ch02.html

摘录:

    4.1. Changes between 2.3.0.1 and 2.4.0

         JAXB RI is now JPMS modularized:

            All modules have native module descriptor.

            Removed jaxb-core module, which caused split package issue on JPMS.

            RI binary bundle now has single jar per dependency instead of shaded fat jars.

            Removed runtime class weaving optimization.

    4.2. Changes between 2.3.0 and 2.3.0.1

          Removed legacy technology dependencies:

            com.sun.xml.bind:jaxb1-impl

            net.java.dev.msv:msv-core

            net.java.dev.msv:xsdlib

            com.sun.xml.bind.jaxb:isorelax

    4.3. Changes between 2.2.11 and 2.3.0

          Adopt Java SE 9:

            JAXB api can now be loaded as a module.

            JAXB RI is able to run on Java SE 9 from the classpath.

            Addes support for java.util.ServiceLoader mechanism.

            Security fixes

权威链接在https://github.com/eclipse-ee4j/jaxb-ri#maven-artifacts

Maven coordinates for JAXB artifacts jakarta.xml.bind:jakarta.xml.bind-api: API classes for JAXB. Required to compile against JAXB. org.glassfish.jaxb:jaxb-runtime: Implementation of JAXB, runtime used for serialization and deserialization java objects to/from xml. JAXB fat-jar bundles: com.sun.xml.bind:jaxb-impl: JAXB runtime fat jar. In contrast to org.glassfish.jaxb artifacts, these jars have all dependency classes included inside. These artifacts does not contain JPMS module descriptors. In Maven projects org.glassfish.jaxb artifacts are supposed to be used instead.

jaxb:jaxb-runtime:jar:2.3.2

[INFO] +- org.glassfish.jaxb:jaxb-runtime:jar:2.3.2:compile
[INFO] |  +- jakarta.xml.bind:jakarta.xml.bind-api:jar:2.3.2:compile
[INFO] |  +- org.glassfish.jaxb:txw2:jar:2.3.2:compile
[INFO] |  +- com.sun.istack:istack-commons-runtime:jar:3.0.8:compile
[INFO] |  +- org.jvnet.staxex:stax-ex:jar:1.8.1:compile
[INFO] |  +- com.sun.xml.fastinfoset:FastInfoset:jar:1.2.16:compile
[INFO] |  \- jakarta.activation:jakarta.activation-api:jar:1.2.1:compile

原来的答案

我应该在Maven项目中为JAXB RI使用哪些构件?在Maven中，你可以使用这样的配置文件:

<profile>
    <id>java-9</id>
    <activation>
        <jdk>9</jdk>
    </activation>
    <dependencies>
        <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>
</profile> 

依赖树显示:

[INFO] +- org.glassfish.jaxb:jaxb-runtime:jar:2.3.0:compile
[INFO] |  +- org.glassfish.jaxb:jaxb-core:jar:2.3.0:compile
[INFO] |  |  +- javax.xml.bind:jaxb-api:jar:2.3.0:compile
[INFO] |  |  +- org.glassfish.jaxb:txw2:jar:2.3.0:compile
[INFO] |  |  \- com.sun.istack:istack-commons-runtime:jar:3.0.5:compile
[INFO] |  +- org.jvnet.staxex:stax-ex:jar:1.7.8:compile
[INFO] |  \- com.sun.xml.fastinfoset:FastInfoset:jar:1.2.13:compile
[INFO] \- javax.activation:activation:jar:1.1.1:compile

要在Eclipse中使用它，请输入Oxygen.3a Release (4.7.3a)或更高版本，按Ctrl-Alt-P，或右键单击项目Maven，然后选择概要文件。

干净的解决方案为所有jdk >= 9

您需要向构建中添加两个依赖项

的jaxb-api jaxb实现

作为实现，我选择使用glassfish的参考实现来摆脱旧的com。Sun类/库。 因此，我添加了我的专业构建

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

<dependency>
  <groupId>org.glassfish.jaxb</groupId>
  <artifactId>jaxb-runtime</artifactId>
  <version>2.3.1</version>
</dependency>

注意，从版本2.3.1开始，您不需要添加javax。不再激活。(参见https://github.com/eclipse-ee4j/jaxb-ri/issues/1222)

SBT解决方案

libraryDependencies += "javax.xml.bind" % "jaxb-api" % "2.3.1"

在将我的项目升级到Java 11之后，我也有类似的问题，然后修复它的是升级到spring boot 2.1.1，显然它支持Java 11，这有帮助