javaaudiogmailimapemail-attachments
Gmail Attachment download issue in java
I am downloading audio files from gmail by using imap in java . audio files successfully downloaded and gets played. often around 5.00 AM IST, file not getting downloaded. getting Exception like "java.lang.NullPointerException". yesterday i faced this issue, but today the same code works fine, audio files are downloaded, i don't know how to manage this in order to find root cause for this problem. Could you please anyone help me on this?
Note: Added more logs for understanding flow for testing purpose,
Log:
TID: [-1234] [] [2021-02-22 03:01:15,925] INFO {com.vb.service.EmailAttachmentDownload} - ====UserName==== : vb.lead@qrsolutions.com.au {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:15,925] INFO {com.vb.service.EmailAttachmentDownload} - ====Password==== : e59851edd90156ff379e {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:15,925] INFO {com.vb.service.EmailAttachmentDownload} - ====FileName==== : 00432214294_rcvm0117_00800000210222130231.wav {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:15,925] INFO {com.vb.service.EmailAttachmentDownload} - ====SaveDirectory==== : /wso2/BulkPush/HarmonySourcePath/ {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:15,925] INFO {com.vb.service.EmailAttachmentDownload} - ====Download FileName==== : VB_TwoWayRecording_00432214294_rcvm0117_00800000210222130231.wav {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:15,925] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 1. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:15,925] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step SetSaveDirectory Method. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:15,925] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 2. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:15,925] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 3. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:15,925] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 4. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:15,925] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 5. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:15,926] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 7. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:15,926] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 8. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:15,928] INFO {com.vb.service.EmailAttachmentDownload$1} - ==== Logger Text ==== : Step 6. {com.vb.service.EmailAttachmentDownload$1}
TID: [-1234] [] [2021-02-22 03:01:17,481] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 9. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:17,792] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 10. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:18,097] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 11. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:18,097] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 12 - 0 {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:18,404] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 13. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:18,404] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 14. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:18,404] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 15. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:18,404] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 16. {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:18,404] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 46 - Exception Sequence {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:18,404] INFO {com.vb.service.EmailAttachmentDownload} - General/Common Exceptionjava.lang.NullPointerException {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:18,404] INFO {com.vb.service.EmailAttachmentDownload} - Exception Message: [Ljava.lang.StackTraceElement;@24983d2b** Exception Message: null {com.vb.service.EmailAttachmentDownload}
TID: [-1234] [] [2021-02-22 03:01:18,404] INFO {com.vb.service.EmailAttachmentDownload} - ==== Logger Text ==== : Step 47. {com.vb.service.EmailAttachmentDownload}
Log-Image:
Code:
package JavaPackage;
import java.util.logging.Logger;
import java.io.File;
import java.io.IOException;
import java.util.Properties;
import javax.mail.Address;
import javax.mail.Flags;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.NoSuchProviderException;
import javax.mail.Part;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.internet.MimeBodyPart;
import javax.mail.search.FlagTerm;
public class GetEmailAttachment {
private String saveDirectory;
private static final Logger logger = Logger.getLogger(GetEmailAttachment.class.getName());
public static void main(String[] args) {
logger.info("===Inside the attachment download class===");
String host = "imap.gmail.com";
String port = "995";
String userName = "username";
String password= "pwd";
String inputFileName ="00432214294_rcvm0117_00800000210222130231.wav";
String saveDirectory = "D:/HarmonyTemplate/Source";
String downloadFileName = "VB_TwoWayRecording_TestAudio";
logger.info("====UserName==== : " + userName);
logger.info("====Password==== : " + password);
logger.info("====FileName==== : " + inputFileName);
logger.info("====SaveDirectory==== : " + saveDirectory);
logger.info("====Download FileName==== : " + downloadFileName);
GetEmailAttachment receiver = new GetEmailAttachment();
logger.info("==== Logger Text ==== : Step 1.");
receiver.setSaveDirectory(saveDirectory);
logger.info("==== Logger Text ==== : Step 2.");
receiver.downloadEmailAttachments(userName, password, inputFileName, downloadFileName);
}
public void setSaveDirectory(String dir) {
logger.info("==== Logger Text ==== : Step SetSaveDirectory Method.");
this.saveDirectory = dir;
}
public boolean downloadEmailAttachments(String userName, String password, String inputfileName,
String downloadFileName) {
try {
logger.info("==== Logger Text ==== : Step 3.");
Properties properties = new Properties();
logger.info("==== Logger Text ==== : Step 4.");
properties.setProperty("mail.host", "imap.gmail.com");
properties.setProperty("mail.port", "995");
properties.setProperty("mail.transport.protocol", "imaps");
logger.info("==== Logger Text ==== : Step 5.");
Session session = Session.getInstance(properties, new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
logger.info("==== Logger Text ==== : Step 6.");
return new PasswordAuthentication(userName, password);
}
});
logger.info("==== Logger Text ==== : Step 7.");
// connects to the message store
Store store = session.getStore("imaps");
logger.info("==== Logger Text ==== : Step 8.");
store.connect();
logger.info("==== Logger Text ==== : Step 9.");
Folder folderInbox = store.getFolder("INBOX");
folderInbox.open(Folder.READ_WRITE);
logger.info("==== Logger Text ==== : Step 10.");
// fetches new messages from server
Message[] arrayMessages = folderInbox.search(new FlagTerm(new Flags(Flags.Flag.SEEN), false));
logger.info("==== Logger Text ==== : Step 11.");
for (int i = 0; i < arrayMessages.length; i++) {
logger.info("==== Logger Text ==== : Step 12 - " + i);
Message message = arrayMessages[i];
Address[] fromAddress = message.getFrom();
logger.info("==== Logger Text ==== : Step 13.");
String from = fromAddress[0].toString();
logger.info("==== Logger Text ==== : Step 14.");
String subject = message.getSubject();
logger.info("==== Logger Text ==== : Step 15.");
String sentDate = message.getSentDate().toString();
logger.info("==== Logger Text ==== : Step 16.");
if ((subject.replaceAll(" ", "").trim().toUpperCase().contains("AUTOMATICTWO-WAYRECORDING"))
|| (subject.replaceAll(" ", "").trim().toUpperCase().contains("MESSAGENOTIFICATIONFROM"))) {
logger.info("====== Inside the subject check of class mediator =======");
String contentType = message.getContentType();
String messageContent = "";
// store attachment file name, separated by comma
String attachFiles = "";
logger.info("==== Logger Text ==== : Step 17.");
if (contentType.contains("multipart")) {
logger.info("======Contains multipart values======");
// content may contain attachments
Multipart multiPart = (Multipart) message.getContent();
logger.info("==== Logger Text ==== : Step 18.");
int numberOfParts = multiPart.getCount();
logger.info("==== Logger Text ==== : Step 19.");
for (int partCount = 0; partCount < numberOfParts; partCount++) {
logger.info("==== Logger Text ==== : Step 20 - " + partCount);
MimeBodyPart part = (MimeBodyPart) multiPart.getBodyPart(partCount);
logger.info("==== Logger Text ==== : Step 21.");
if (Part.ATTACHMENT.equalsIgnoreCase(part.getDisposition())) {
logger.info("==== Logger Text ==== : Step 22.");
// this part is attachment
String fileName = part.getFileName();
logger.info("==== Logger Text ==== : Step 23.");
if (inputfileName.equals(fileName)) {
logger.info("==== Logger Text ==== : Step 24.");
attachFiles += fileName + ", ";
logger.info("====== Final Values ====== "
+ (saveDirectory + File.separator + downloadFileName));
part.saveFile(saveDirectory + File.separator + downloadFileName);
logger.info("==== Logger Text ==== : Step 25.");
return true;
}
logger.info("==== Logger Text ==== : Step 26.");
} else {
logger.info("==== Logger Text ==== : Step 27.");
// this part may be the message content
messageContent = part.getContent().toString();
logger.info("==== Logger Text ==== : Step 28.");
}
logger.info("==== Logger Text ==== : Step 29.");
}
logger.info("==== Logger Text ==== : Step 30.");
if (attachFiles.length() > 1) {
logger.info("==== Logger Text ==== : Step 31.");
attachFiles = attachFiles.substring(0, attachFiles.length() - 2);
}
logger.info("==== Logger Text ==== : Step 32.");
} else if (contentType.contains("text/plain") || contentType.contains("text/html")) {
logger.info("==== Logger Text ==== : Step 33.");
Object content = message.getContent();
logger.info("==== Logger Text ==== : Step 34.");
if (content != null) {
logger.info("==== Logger Text ==== : Step 35.");
messageContent = content.toString();
logger.info("==== Logger Text ==== : Step 36.");
}
logger.info("==== Logger Text ==== : Step 37.");
}
logger.info("==== Logger Text ==== : Step 38.");
// print out details of each message
logger.info("Message #" + (i + 1) + ":");
logger.info("\t From: " + from);
logger.info("\t Subject: " + subject);
logger.info("\t Sent Date: " + sentDate);
logger.info("\t Message: " + messageContent);
logger.info("\t Attachments: " + attachFiles);
}
logger.info("==== Logger Text ==== : Step 39.");
}
logger.info("==== Logger Text ==== : Step 40.");
// disconnect
folderInbox.close(false);
logger.info("==== Logger Text ==== : Step 41.");
store.close();
logger.info("==== Logger Text ==== : Step 42.");
} catch (NoSuchProviderException ex) {
logger.info("==== Logger Text ==== : Step 43 - Exception Sequence");
logger.info("No provider for pop3." + ex);
logger.info("Exception Message: " + ex.getStackTrace() + "** " + "Exception Message: " + ex.getMessage());
ex.printStackTrace();
//context.setProperty("EXCEPTION_MESSAGE_Raw", ex.toString());
} catch (MessagingException ex) {
logger.info("==== Logger Text ==== : Step 44 - Exception Sequence");
logger.info("Could not connect to the message store" + ex);
logger.info("Exception Message: " + ex.getStackTrace() + "** " + "Exception Message: " + ex.getMessage());
ex.printStackTrace();
//context.setProperty("EXCEPTION_MESSAGE_Raw", ex.toString());
} catch (IOException ex) {
logger.info("==== Logger Text ==== : Step 45 - Exception Sequence");
logger.info("Exception in IO Files" + ex);
logger.info("Exception Message: " + ex.getStackTrace() + "** " + "Exception Message: " + ex.getMessage());
ex.printStackTrace();
} catch (Exception ex) {
logger.info("==== Logger Text ==== : Step 46 - Exception Sequence");
logger.info("General/Common Exception" + ex);
logger.info("Exception Message: " + ex.getStackTrace() + "** " + "Exception Message: " + ex.getMessage());
ex.printStackTrace();
logger.info(ex.toString());
}
logger.info("==== Logger Text ==== : Step 47.");
return true;
}
}
Solution
You print Log 16, and then Log 46 of throwing NullPointer.
Your problem lies in :
if ((subject.replaceAll(" ", "").trim().toUpperCase().contains("AUTOMATICTWO-WAYRECORDING"))
|| (subject.replaceAll(" ", "").trim().toUpperCase().contains("MESSAGENOTIFICATIONFROM"))) {
Because you are not printing, "====== Inside the subject check of class mediator =======" before you are catching your exception.
Your subject is null.
By the way, you are not guaranteed to pass after this either. You could still face another NullPointer by the next steps if you dont check for != null
Fix: if ((subject != null && subject.replaceAll(" ", "").trim().toUpperCase().contains("AUTOMATICTWO-WAYRECORDING"))
|| (subject.replaceAll(" ", "").trim().toUpperCase().contains("MESSAGENOTIFICATIONFROM"))) {
This works because if subject == null, it will fail fast and exist the if statement without checking subject.replaceAll.
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