使用Jakarta JAXB遭遇ClassNotFoundException的排查与解决

项目基础信息 #

• 开发场景：SQL数据库管理交互Web界面，基于Servlet + Jakarta Servlet JSTL
• 服务器版本：TomCat v10.1
• 目标功能：通过JAXB实现数据的XML格式导入导出

初始报错信息 #

执行代码JAXBContext context = JAXBContext.newInstance(ExportVeiculo.class);时触发异常：

SEVERE: Servlet.service() for servlet [Servlets.VeiculoServlet] in context with path [/ExamplePath] threw exception [Servlet execution threw an exception] with root cause
java.lang.ClassNotFoundException: org.glassfish.jaxb.core.v2.model.annotation.AnnotationReader

已确认问题源于依赖配置，尝试过将相关JAR包放入项目WEB-INF/lib目录及服务器lib目录，均未解决。

依赖补充与错误排查步骤 #

1. 移除jaxb-impl并添加jaxb-core-3.0.1.jar后，出现新的类缺失错误：

SEVERE: Servlet.service() for servlet [Servlets.VeiculoServlet] in context with path [/ExamplePath] threw exception [Servlet execution threw an exception] with root cause java.lang.ClassNotFoundException: com.sun.istack.Pool

2. 补充istack-commons-runtime-3.0.1.jar后，仍存在类缺失问题：

SEVERE: Servlet.service() for servlet [Servlets.VeiculoServlet] in context with path [/ExamplePath] threw exception [Servlet execution threw an exception] with root cause
java.lang.ClassNotFoundException: jakarta.activation.DataSource

最终解决方案 #

添加Jakarta Activation API 2.0.1依赖后，问题彻底解决。

内容的提问来源于stack exchange，提问作者Letho123