Adding standard Java libraries with SBT

Question

How does one add standard Java libraries to SBT. For example, my class relies on these imports:

import javax.mail._
import javax.mail.internet._
import java.util.Properties

Trying to compile with SBT fails if I use these, for example:

[error] /Users/jacobus/scalaprojects/doxy/src/main/scala/EmailService.scala:6: expected class or object definition
[error]   val props = new Properties();

Here's the source:

import java.util.Properties
import javax.mail._
import javax.mail.internet._

val props = new Properties();
props.put("mail.smtp.host", "localhost");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable","true");
props.put("mail.debug", "true");
val session = Session.getInstance(props);
val message = new MimeMessage(session);
message.setFrom(new InternetAddress("[email protected]"));
message.setRecipients(Message.RecipientType.TO, "[email protected]");
message.setSubject("This is the Subject");
message.setText("This is the Message");
val transport = session.getTransport("smtp");
transport.connect("localhost","username","password")
Transport.send(message);

The error doesn't seem to be relative to the import but rather to the lack of a class / object definition in your class. Might it be the case? — Nicolas
– Nicolas, Commented Feb 27, 2012 at 10:09
I wish it was, but the code runs fine in Idea. I just can't compile it with SBT — Jack
– Jack, Commented Feb 27, 2012 at 10:16
I've had this problem before where the Twitter Finagle libraries also depended on javax and could also not include it. — Jack
– Jack, Commented Feb 27, 2012 at 10:18
You get that error because you try to compile a scala script file as if it's a scala source file. In a scala source file all val statements must be inside a scala object or a scala class. A scala script file can be run with scala, but can't be compiled with scalac. — thoredge
– thoredge, Commented Feb 27, 2012 at 10:21

Daniel C. Sobral · Accepted Answer · 2012-02-27 13:22:10Z

3

That is not compilable code: it's a script. A script can be run, but cannot be compiled.

Put that stuff inside a standard application declaration, like object MyApp extends App {, and you might get other errors, but not this one.

answered Feb 27, 2012 at 13:22

Daniel C. Sobral

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1 Comment

Jack Over a year ago

Thanks D. I was having a blonde moment. That gets me the dufus award for the day.

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