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POHow to send email with large attach? (OutOfMemoryError: java heap space)
 

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    <p>I met an <code>OutOfMemoryError: Java Heap Space</code> when I tried to attach a large attachment. When emails with some large files (say 50M) are sent, the error will be thrown.<br></p> <p>The code is like this:</p> <pre><code>//add attaches if (vo.getAttaches() != null) { InputStream iStream = null; ByteArrayDataSource bdSource = null; String filename = null; for (int i = 0; i &lt; vo.getAttaches().length; i++) { iStream = new FileInputStream(vo.getAttaches()[i]); bdSource = new ByteArrayDataSource(iStream, null); filename = vo.getAttachesFileName()[i]; email.attach(bdSource, MimeUtility.encodeText(filename), filename); } } </code></pre> <p>It is <code>bdSource = new ByteArrayDataSource(iStream, null)</code> throws the exception above. I had read "<a href="https://stackoverflow.com/questions/1945390/out-of-memory-using-java-mail">out of memory using java mail</a>" but i don't understand. How can I upload large attaches? If I define a buffer like <code>byte[1024]</code>, then how to code <code>email.attach()</code>? Should all data in buffer use the same <code>filename</code>?</p> <hr> <p><strong>Update:</strong> Thanks for your kindness. I use FileDataSource instead of ByteArrayDataSource, it seems that there's no exception in my send() function. But I still can not send emails with large attach. The <strong>apache james</strong> got this error: </p> <pre><code> java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOf(Arrays.java:2786) at java.io.ByteArrayOutputStream.toByteArray(ByteArrayOutputStream.java:133) at com.sun.mail.util.ASCIIUtility.getBytes(ASCIIUtility.java:261) at javax.mail.internet.MimeMessage.parse(MimeMessage.java:338) at org.apache.james.core.MimeMessageWrapper.parse(MimeMessageWrapper.java:477) at org.apache.james.core.MimeMessageWrapper.loadMessage(MimeMessageWrapper.java:205) at org.apache.james.core.MimeMessageWrapper.checkModifyHeaders(MimeMessageWrapper.java:414) at org.apache.james.core.MimeMessageWrapper.setHeader(MimeMessageWrapper.java:426) at org.apache.james.core.MimeMessageCopyOnWriteProxy.setHeader(MimeMessageCopyOnWriteProxy.java:652) at org.apache.james.transport.mailets.UsersRepositoryAliasingForwarding.service(UsersRepositoryAliasingForwarding.java:101) at org.apache.james.transport.mailets.LocalDelivery.service(LocalDelivery.java:64) at org.apache.james.transport.LinearProcessor.service(LinearProcessor.java:424) at org.apache.james.transport.JamesSpoolManager.process(JamesSpoolManager.java:405) at org.apache.james.transport.JamesSpoolManager.run(JamesSpoolManager.java:309) at java.lang.Thread.run(Thread.java:619) 03/07/12 13:08:33 ERROR spoolmanager: An error occurred processing Mail1341292071375-0 through transport 03/07/12 13:08:33 ERROR spoolmanager: Result was error 03/07/12 13:08:33 ERROR spoolmanager: Exception in processor &lt;error&gt; java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOf(Arrays.java:2786) at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:94) at org.apache.james.core.MimeMessageUtil.copyStream(MimeMessageUtil.java:168) at org.apache.james.core.MimeMessageWrapper.writeTo(MimeMessageWrapper.java:276) at org.apache.james.core.MimeMessageUtil.writeTo(MimeMessageUtil.java:66) at org.apache.james.core.MimeMessageUtil.writeTo(MimeMessageUtil.java:50) at org.apache.james.mailrepository.MessageInputStream.writeStream(MessageInputStream.java:131) at org.apache.james.mailrepository.MessageInputStream.&lt;init&gt;(MessageInputStream.java:101) at org.apache.james.mailrepository.JDBCMailRepository.store(JDBCMailRepository.java:718) at org.apache.james.transport.mailets.ToRepository.service(ToRepository.java:98) at org.apache.james.transport.LinearProcessor.service(LinearProcessor.java:424) at org.apache.james.transport.JamesSpoolManager.process(JamesSpoolManager.java:405) at org.apache.james.transport.JamesSpoolManager.run(JamesSpoolManager.java:309) at java.lang.Thread.run(Thread.java:619) 03/07/12 13:08:33 ERROR spoolmanager: An error occurred processing Mail1341292071375-0 through error 03/07/12 13:08:33 ERROR spoolmanager: Result was ghost </code></pre>
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