迁移到JDK 11时出现错误“java.lang.NoClassDefFoundError：javax / activation / DataSource”(tomcat 9.0.12)

之后,我建议添加第三方** activation-1.0.2.jar *但仍然发生了错误？
请提出有关问题的建议？你能否告诉我有关迁移源代码使用Java 8到Java 11的经验(服务器与tomcat 9.0.12.编译器Eclipse 2018-09(4.9.0)

这是详细错误：

Caused by: java.lang.NoClassDefFoundError: javax/activation/DataSource
    at java.base/java.lang.Class.getDeclaredMethods0(Native Method)
    at java.base/java.lang.Class.privateGetDeclaredMethods(Class.java:3167)
    at java.base/java.lang.Class.getDeclaredMethods(Class.java:2310)
    at org.apache.catalina.util.Introspection.getDeclaredMethods(Introspection.java:133)
    at org.apache.catalina.startup.WebAnnotationSet.loadMethodsAnnotation(WebAnnotationSet.java:285)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:138)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:69)
    at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:328)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:768)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:299)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5007)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

您应该包含javax.activation：javax.activation-api：1.2.0作为项目的外部依赖项,以显式访问类javax.activation.DataSource.相同的样本maven依赖关系是：

<dependency>
  <groupId>javax.activation</groupId>
  <artifactId>javax.activation-api</artifactId>
  <version>1.2.0</version>
</dependency>

另外,请注意,如果使用模块化代码(包括module-info.java),则必须使用声明声明对库的依赖 –

requires java.activation;