When sending multipart emails through the GAE send API, we sometimes
get the following exception:
Uncaught exception from servlet
java.lang.NoClassDefFoundError: java.awt.Component is a restricted
class. Please see the Google App Engine developer's guide for more
details.
at
com.google.apphosting.runtime.security.shared.stub.java.awt.Component.<clinit>(Component.java)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:
57)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:
45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
at java.lang.Class.newInstance0(Class.java:372)
at java.lang.Class.newInstance(Class.java:325)
at
javax.activation.MailcapCommandMap.getDataContentHandler(MailcapCommandMap.java:
596)
at
javax.activation.MailcapCommandMap.createDataContentHandler(MailcapCommandMap.java:
550)
at
javax.activation.CommandMap.createDataContentHandler(CommandMap.java:
206)
at
javax.activation.DataHandler.getDataContentHandler(DataHandler.java:
609)
at javax.activation.DataHandler.getContent(DataHandler.java:537)
at javax.mail.internet.MimeBodyPart.getContent(MimeBodyPart.java:392)
at
com.google.appengine.api.mail.stdimpl.GMTransport.sendMessage(GMTransport.java:
225)
at javax.mail.Transport.send(Transport.java:95)
at javax.mail.Transport.send(Transport.java:48)
Here is how we are sending the multipart email:
Properties props = new Properties();
Session mailSession = Session.getDefaultInstance(props, null);
MimeMessage message = new MimeMessage(mailSession);
MimeMultipart multipart = new MimeMultipart();
// first part (the html)
BodyPart htmlPart = new MimeBodyPart();
htmlPart.setContent(htmlText, "text/html");
multipart.addBodyPart(htmlPart);
// second part (the image)
BodyPart attachmentPart = new MimeBodyPart();
attachmentPart.setFileName("screenshot.jpg");
DataSource imageSrc = new ByteArrayDataSource(image, "image/jpeg");
attachmentPart.setDataHandler(new DataHandler(imageSrc));
multipart.addBodyPart(attachmentPart);
message.setContent(multipart);
message.saveChanges();
Transport.send(message);
We are rarely using the GAE email API, so it is not a big deal for us
(most outbound emails using a 3rd party SMTP service), but just
thought that is an issue that seems important enough to be reported.
Adding a bitmap in a multipart email is a pretty standard use case.
Cheers,
Jerome
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