我继承了一些代码，当我尝试运行它时遇到错误。错误如下：
10:08:32,093 ERROR [MyServlet]:260 - Servlet.service() for servlet MyServlet threw exception
java.lang.IllegalArgumentException: setAttribute: Non-serializable attribute
at org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1270)
at org.apache.catalina.session.StandardSession.setAttribute(StandardSession.java:1248)
at org.apache.catalina.session.StandardSessionFacade.setAttribute(StandardSessionFacade.java:130)
at uk.co.my.servlet.MyServlet.doPost(MyServlet.java:121)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at com.my.ddi.security.SecurityContextServletFilter.doFilter(SecurityContextServletFilter.java:55)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:835)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:640)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1286)
at java.lang.Thread.run(Unknown Source)
我想主要问题是它击中我的代码的地方在 uk.co.my.servlet.MyServlet.doPost(MyServlet.java:172)。 MyServlet 的第 121 行是
session.setAttribute("LISTENER", myListener);
这个 myListener 对象来自以下类：
public class myListener {
static Log log = LogFactory.getLog(TerminationListener.class.getName());
private boolean shouldCancel = false;
我该如何摆脱这个错误？我需要使用瞬态关键字吗？
如果你想要一个实例myListener要放置在会话中，您需要使其可序列化。那might涉及使某些字段成为临时字段，但这些字段将不会保存在会话中。您还需要让课程实现Serializable.
我建议你看看可序列化的文档 http://java.sun.com/javase/6/docs/api/java/io/Serializable.html，其中详细介绍了有关序列化的信息。
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