Can provide the similar fix for EmlLoadOption similar to issue raised in ticket https://forum.aspose.com/t/java-heap-space-errors-with-large-emails/277098/3

Aspose.Email Product Family
1

Hi,
Can we have OOM related issue fix option for EmlLoadOption as well similar to issue reported in ticket Java Heap Space errors with large emails - Free Support Forum - aspose.com

Fix:
MsgLoadOptions lo = new MsgLoadOptions();
lo.setLeaveOpen(true);
try (MapiMessage m = MapiMessage.load(“large_attachment.msg”, lo)) {
System.out.println(m.getAttachments().get(0).getFileName());
System.out.println(m.getAttachments().get(0).getDisplayName());
m.getAttachments().get(0).save(“att.dat”);
}

Thanks.

2

@schukka

To address the OutOfMemory (OOM) issues when working with large emails using EmlLoadOption, you can implement a similar approach as the one used for MsgLoadOptions. The key is to optimize memory usage by ensuring that resources are properly managed during the loading process.

Here’s a code example demonstrating how to use EmlLoadOptions with a focus on memory optimization:

EmlLoadOptions options = new EmlLoadOptions();
options.setLeaveOpen(true); // Keep the message open to optimize memory usage

try (MailMessage message = MailMessage.load("large_email.eml", options)) {
    // Process the email message
    System.out.println("Subject: " + message.getSubject());
    System.out.println("Attachments count: " + message.getAttachments().size());
    
    // Save the first attachment as an example
    if (!message.getAttachments().isEmpty()) {
        Attachment attachment = message.getAttachments().get(0);
        attachment.save("attachment.dat");
    }
} catch (Exception e) {
    e.printStackTrace();
}

In this example, the EmlLoadOptions is configured to leave the message open, which can help in managing memory more effectively. After processing the email, ensure to close or dispose of the message to release resources properly.

This approach should help mitigate OOM issues similar to those encountered with large attachments in other formats. If you have further questions or need additional assistance, feel free to ask!

Sources:
[1]: Java Heap Space errors with large emails

3

Hello @schukka,

An EML MIME message stores attachments in encoded formats such as Base64 or Quoted-printable. This encoding is essential for transmitting non-text data over email systems that primarily handle text. Implementing support for large attachments is quite challenging as the process is resource-intensive, requiring significant computational power for encoding and decoding.