Javamail与Gmail的IMAP连接在随机时间后丢弃

我正在使用Javamail向gmail imap服务器进行身份验证，并一次获取完整邮箱的一个邮件标头并在本地索引。对于信息很少的收件箱，这可以正常工作。对于邮件总数超过10k的收件箱，javamail imap连接将被删除（可能通过服务器）。需要注意的是这个持续时间是随机的。Javamail与Gmail的IMAP连接在随机时间后丢弃

由于我不断地获取邮件标题一个接一个，没有时间连接空闲很长时间，所以它不能超时。

------------------------------代码--------------- -----------------

IMAPSSLStore imapSslStore = connectToImap("imap.googlemail.com", 993, email, oauthToken, oauthTokenSecret, getMyConsumer(), true); 
System.out.println("Successfully authenticated to IMAP.\n"); 
Folder inbox = imapSslStore.getFolder("[Gmail]/All Mail"); 
inbox.open(Folder.READ_ONLY); 

Message messages[] = inbox.getMessages(); 

for(Message message:messages) { 
    System.out.println(message); 
    System.out.println("MSG NO:"+message.getMessageNumber()); 
    System.out.println("FROM:"+message.getFrom().toString()); 
}

-------------------------- - - -码 - - - - - - - - - - - - - - - - - - - - - -

异常跟踪：

[java] javax.mail.FolderClosedException: * BYE JavaMail Exception: java.io.IOException: **Connection dropped by server?** 

[java] at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:194) 
[java] at org.apache.tools.ant.taskdefs.Java.run(Java.java:747) 
[java] at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:201) 
[java] at org.apache.tools.ant.taskdefs.Java.execute(Java.java:104) 
[java] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) 
[java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
[java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
[java] at java.lang.reflect.Method.invoke(Method.java:597) 
[java] at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105) 
[java] at org.apache.tools.ant.Task.perform(Task.java:348) 
[java] at org.apache.tools.ant.Target.execute(Target.java:357) 
[java] at org.apache.tools.ant.Target.performTasks(Target.java:385) 
[java] at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329) 
[java] at org.apache.tools.ant.Project.executeTarget(Project.java:1298) 
[java] at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) 
[java] at org.apache.tools.ant.Project.executeTargets(Project.java:1181) 
[java] at org.apache.tools.ant.Main.runBuild(Main.java:698) 
[java] at org.apache.tools.ant.Main.startAnt(Main.java:199) 
[java] at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257) 
[java] at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104) 
[java] Caused by: javax.mail.FolderClosedException: * BYE JavaMail Exception: java.io.IOException: Connection dropped by server? 
[java] at com.sun.mail.imap.IMAPMessage.loadEnvelope(IMAPMessage.java:1198) 
[java] at com.sun.mail.imap.IMAPMessage.getFrom(IMAPMessage.java:233) 
[java] at com.google.code.samples.xoauth.XoauthAuthenticator.main(XoauthAuthenticator.java:209) 
[java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
[java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
[java] at java.lang.reflect.Method.invoke(Method.java:597) 
[java] at org.apache.tools.ant.taskdefs.ExecuteJava.run(ExecuteJava.java:217) 
[java] at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:152) 
[java] ... 20 more 
[java] --- Nested Exception --- 
[java] javax.mail.FolderClosedException: * BYE JavaMail Exception: java.io.IOException: Connection dropped by server? 
[java] at com.sun.mail.imap.IMAPMessage.loadEnvelope(IMAPMessage.java:1198) 
[java] at com.sun.mail.imap.IMAPMessage.getFrom(IMAPMessage.java:233) 
[java] at com.google.code.samples.xoauth.XoauthAuthenticator.main(XoauthAuthenticator.java:209) 
[java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
[java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
[java] at java.lang.reflect.Method.invoke(Method.java:597) 
[java] at org.apache.tools.ant.taskdefs.ExecuteJava.run(ExecuteJava.java:217) 
[java] at org.apache.tools.ant.taskdefs.ExecuteJava.execute(ExecuteJava.java:152) 
[java] at org.apache.tools.ant.taskdefs.Java.run(Java.java:747) 
[java] at org.apache.tools.ant.taskdefs.Java.executeJava(Java.java:201) 
[java] at org.apache.tools.ant.taskdefs.Java.execute(Java.java:104) 
[java] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288) 
[java] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
[java] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
[java] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
[java] at java.lang.reflect.Method.invoke(Method.java:597) 
[java] at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:105) 
[java] at org.apache.tools.ant.Task.perform(Task.java:348) 
[java] at org.apache.tools.ant.Target.execute(Target.java:357) 
[java] at org.apache.tools.ant.Target.performTasks(Target.java:385) 
[java] at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329) 
[java] at org.apache.tools.ant.Project.executeTarget(Project.java:1298) 
[java] at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41) 
[java] at org.apache.tools.ant.Project.executeTargets(Project.java:1181) 
[java] at org.apache.tools.ant.Main.runBuild(Main.java:698) 
[java] at org.apache.tools.ant.Main.startAnt(Main.java:199) 
[java] at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257) 
[java] at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)

我使用的是独立版本的JavaMail的（1.4.3），我现在努力解决这一问题了一会儿。任何帮助表示赞赏。

来源

2010-10-16 Nands

你能最终解决这个问题吗？我打算使用这个以及... – Theo 2011-07-20 13:50:47

不幸的是，这仍然是一个问题。我们只需要在Google BYE之后重新尝试。 – 2013-10-15 00:00:21

@SaqibAli你试过我的解决方案吗？ – 2013-10-16 21:07:27

您需要捕获FolderClosedException，然后尝试再次连接。我遇到过这个问题，并通过下面的代码解决它：

catch (FolderClosedException ex) { 
         ex.printStackTrace(); 
         ConnectPop3(Username, Password); 
         if (!folder.isOpen()) { 
          folder.open(Folder.READ_ONLY); 
          messages = folder.getMessages(); 
         } 
        }

来源

2011-12-28 04:47:06

Javamail与Gmail的IMAP连接在随机时间后丢弃

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