又错了？大侠帮忙看看，错误信息如下。

这是我在用JAVAMAIL读取邮件时出错的信息.
JASPER_LOG> Wed May 16 10:09:42 CST 2001 Classpath according to the init parameter is:

Context log: path="" Error in jsp service() : DEFAULT_CHARSET
javax.servlet.ServletException: DEFAULT_CHARSET

at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:386)

at mailsys._0002fmailsys_0002freadmsg_00031_0002ejspreadmsg1_jsp_16._jspService(_0002fmailsys_0002freadmsg_00031_0002ejspreadmsg1_jsp_16.java:302)

at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:174)

at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:261)

at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:369)

at com.borland.jbuilder.webserverglue.tomcat.jsp.JspLoaderEcho.service(Unknown Source)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)

at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)

at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)

at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160)

at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)

at java.lang.Thread.run(Thread.java:484)

Context log: path="" Internal Servlet Error:



javax.servlet.ServletException: DEFAULT_CHARSET at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:386) at mailsys._0002fmailsys_0002freadmsg_00031_0002ejspreadmsg1_jsp_16._jspService(_0002fmailsys_0002freadmsg_00031_0002ejspreadmsg1_jsp_16.java:302) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:174) at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:261) at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:369) at com.borland.jbuilder.webserverglue.tomcat.jsp.JspLoaderEcho.service(Unknown Source) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503) at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559) at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160) at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338) at java.lang.Thread.run(Thread.java:484)


Root cause:


java.io.UnsupportedEncodingException: DEFAULT_CHARSET at sun.io.Converters.getConverterClass(Converters.java:93) at sun.io.Converters.newConverter(Converters.java:124) at sun.io.ByteToCharConverter.getConverter(ByteToCharConverter.java:67) at java.io.InputStreamReader.(InputStreamReader.java:78) at com.sun.mail.handlers.text_plain.getContent(text_plain.java:65) at javax.activation.DataSourceDataContentHandler.getContent(DataHandler.java:755) at javax.activation.DataHandler.getContent(DataHandler.java:511) at javax.mail.internet.MimeMessage.getContent(MimeMessage.java:1259) at mailsys._0002fmailsys_0002freadmsg_00031_0002ejspreadmsg1_jsp_16._jspService(_0002fmailsys_0002freadmsg_00031_0002ejspreadmsg1_jsp_16.java:257) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:174) at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:261) at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:369) at com.borland.jbuilder.webserverglue.tomcat.jsp.JspLoaderEcho.service(Unknown Source) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503) at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559) at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160) at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338) at java.lang.Thread.run(Thread.java:484)