Issue

We use JavaMail to poll an email inbox and pull information into our application. When we encounter an e-mail with a large attachment, for example 7MB, it can take 1-2 hours to process the e-mail. Sometimes we may also get an error like this:

java.lang.ArrayIndexOutOfBoundsException: message number (39) out of bounds (38)
        at com.sun.mail.imap.MessageCache.getMessage(MessageCache.java:132) [mail-1.4.5-redhat-1.jar:1.4.5-redhat-1]
        at com.sun.mail.imap.MessageCache.getMessageBySeqnum(MessageCache.java:162) [mail-1.4.5-redhat-1.jar:1.4.5-redhat-1]
        at com.sun.mail.imap.IMAPFolder.getMessageBySeqNumber(IMAPFolder.java:2809) [mail-1.4.5-redhat-1.jar:1.4.5-redhat-1]
        at com.sun.mail.imap.IMAPFolder.handleResponse(IMAPFolder.java:2486) [mail-1.4.5-redhat-1.jar:1.4.5-redhat-1]
        at com.sun.mail.iap.Protocol.notifyResponseHandlers(Protocol.java:216) [mail-1.4.5-redhat-1.jar:1.4.5-redhat-1]
        at com.sun.mail.imap.protocol.IMAPProtocol.fetchBody(IMAPProtocol.java:1319) [mail-1.4.5-redhat-1.jar:1.4.5-redhat-1]
        at com.sun.mail.imap.protocol.IMAPProtocol.fetchBody(IMAPProtocol.java:1306) [mail-1.4.5-redhat-1.jar:1.4.5-redhat-1]
        ...

We think it has to do with the default fetchsize setting and we are not sure how to update the setting.

• Can you help us configure the fetchsize to be larger than the 16KB default?
• Do you have a recommendation for an optimal setting or how to determine an optimal setting?