java - Tomcat 内部错误

Question

我有一个 AuthorizationServlet，它在用户单击登录页面中的按钮时被调用。这是servlet的doPost方法的一段代码:

        AuthorizationBean bean = new AuthorizationBean();
        String login = (String) request.getSession().getAttribute("login");
        String password = (String) request.getSession().getAttribute("password");
        try {
            UserType type = bean.getRoleOfUser(login, password);
            switch(type) {
                ...
            }
        } catch (DaoException ex) {
            throw new ServletException(ex.getMessage());
        }

我省略了一些代码，因为它不适用问题。实际上，DaoException 只能在这一行抛出 UserType type = bean.getRoleOfUser(login, password);在方法 getRoleOfUser 中，我使用 tomcat 的连接池连接到数据库(我如何获得连接的描述在第一篇文章中 here )

这里还有我的 context.xml，它创建了数据库连接的资源:

<?xml version="1.0" encoding="UTF-8"?>
<Context antiJARLocking="true" path="/Project">
    <Resource name="jdbc/Project" auth="Container"
        type="javax.sql.DataSource" maxActive="100"
        maxIdle="30" maxWait="10000"
        username="name"
        password="password"
        driverClassName="oracle.jdbc.driver.OracleDriver"
        url="jdbc:oracle:thin:@127.0.0.1:1521:XE"/>
</Context>

当调用 AuthorizationServlet 时，出现这样的错误:

javax.servlet.ServletException: Error instantiating servlet class com.tspp.common.AuthorizationServlet
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:864)
    org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
    org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1665)
    java.lang.Thread.run(Thread.java:662)
root cause

java.lang.NoClassDefFoundError: com/tspp/dao/exceptions/DaoException
    java.lang.Class.getDeclaredConstructors0(Native Method)
    java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
    java.lang.Class.getConstructor0(Class.java:2699)
    java.lang.Class.newInstance0(Class.java:326)
    java.lang.Class.newInstance(Class.java:308)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:864)
    org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
    org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1665)
    java.lang.Thread.run(Thread.java:662)
root cause

java.lang.ClassNotFoundException: com.tspp.dao.exceptions.DaoException
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
    java.lang.Class.getDeclaredConstructors0(Native Method)
    java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
    java.lang.Class.getConstructor0(Class.java:2699)
    java.lang.Class.newInstance0(Class.java:326)
    java.lang.Class.newInstance(Class.java:308)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:864)
    org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
    org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1665)
    java.lang.Thread.run(Thread.java:662)

我试过调试它，但调试器甚至没有到达 servlet doPost 方法。实际上，当我启动程序时(在 servlet 激活之前)抛出了最后 2 个异常

我该如何解决这个问题？

Answer 1

确保所有类都在 WEB-INF/classes