org.apache.jasper.JasperException:无法为JSP编译类

Question

我是新手使用库,但我需要能够向忘记密码的用户发送电子邮件.我正在尝试使用JavaMail和Apache Commons Email来实现这一点.但是,我认为我必须错误地导入库.

当我尝试发送电子邮件时,收到以下消息:

Apr 17, 2011 11:54:33 AM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 60 in the jsp file: /sendpw.jsp
The type javax.mail.Authenticator cannot be resolved. It is indirectly referenced from required .class files

代码:

57:                 EmailAuthentication ea = new EmailAuthentication();
58:                 String authUser = ea.getUser();
59:                 String authPw = ea.getPw();
60:                 email.setAuthenticator(new DefaultAuthenticator(authUser, authPw));
61:                 email.setTLS(true);
62:                 email.setFrom(authUser+"@gmail.com");
63:                 email.setSubject("Your Last Love Password");

堆栈跟踪:

at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:439)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:349)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:589)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555)
at java.lang.Thread.run(Thread.java:662)

我尝试过几件事:

1. 将包含所有.java文件的org.apache.commons.mail文件夹复制到我的netbeans项目的源文件中,然后将javamail库添加到项目中.这是第一次工作,我能够发送一些成功的电子邮件,但在路上它停止工作(也许是因为我清理并建立了项目),我收到上述消息.

2. 在commons-email-1.2的bin版本中创建了一个带有jar文件的新库,就像我对javamail一样,并将其添加到项目中.这个似乎不起作用,因为当我打开defaultauthenticator.java时,它无法导入javax.mail.Authenticator,尽管我已将两个库添加到同一个netbeans项目中.

3. 将java.mail中的mail.jar和所有其他.jars(dsn.jar,imap.jar,pop3.jar等)添加到与apache common-email-1.2相同的库中,这意味着2个类路径文件(mail.jar和commons- email-1.2.jar)和6个源文件.这次,defaultauthenticator.java中没有错误,但仍然无法发送任何电子邮件(与上面相同的服务器错误).

涉及的代码部分是:

           HtmlEmail email = new HtmlEmail();

            email.setHostName("smtp.gmail.com");

            email.setSmtpPort(587);

            ......

            email.setAuthenticator(new DefaultAuthenticator(authUser, authPw));

            email.setTLS(true);

            email.setFrom(authUser+"@gmail.com");

            email.setSubject("Your Password");

....

我使用的是Netbeans 6.9.1,tomcat 6.0.26.

我做错了什么？

Answer 1

您需要从Web应用程序中访问mail.jar- 可能是activation.jar- 库,因此它们应该是

• 在tomcat6/lib中,或者
• 在yourwebapp/WEB-INF/lib中

夹.