java - 加载 jcaptcha servlet 时无法初始化类错误

Question

在本地调试我的 webapp 时一切都运行良好，但是当将它部署到服务器(Microsoft Azure，操作系统:Ubuntu 14.04 tomcat7+apache)时，找不到 jcaptcha servlet，它抛出异常为“java.lang .NoClassDefFoundError: 无法初始化类 "

type Exception report

message Servlet execution threw an exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet execution threw an exception
    org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:88)
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
root cause

java.lang.NoClassDefFoundError: Could not initialize class com.tjw.hrmanage.util.jcaptcha.CaptchaServiceSingleton
    com.tjw.hrmanage.util.jcaptcha.JcaptchaServlet.doGet(JcaptchaServlet.java:40)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:88)
    org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.52 (Ubuntu) logs.

Answer 1

这是因为你的app在ubuntu中找不到对应的jar文件。您可以将此类的 jar 文件添加到/lib 并在 eclipse 的“构建路径”中添加对此 jar 的引用，然后再次将您的项目重新部署到 azure。