ServiceConfigurationError IMAPProvider not a subtype

[sreyasvpariyath]

Hi, I have been trying to integrate greenmail to test my email sending code, I am getting the following error when I run the test, Could you please help with it.

Exception in thread "smtp:127.0.0.1:3025<-/127.0.0.1:55914" java.util.ServiceConfigurationError: javax.mail.Provider: com.sun.mail.imap.IMAPProvider not a subtype
	at java.base/java.util.ServiceLoader.fail(ServiceLoader.java:593)
	at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNextService(ServiceLoader.java:1244)
	at java.base/java.util.ServiceLoader$LazyClassPathLookupIterator.hasNext(ServiceLoader.java:1273)
	at java.base/java.util.ServiceLoader$2.hasNext(ServiceLoader.java:1309)
	at java.base/java.util.ServiceLoader$3.hasNext(ServiceLoader.java:1393)
	at javax.mail.Session.loadProviders(Session.java:964)
	at javax.mail.Session.<init>(Session.java:254)
	at javax.mail.Session.getDefaultInstance(Session.java:355)
	at javax.mail.Session.getDefaultInstance(Session.java:395)
	at com.icegreen.greenmail.util.GreenMailUtil.newMimeMessage(GreenMailUtil.java:69)
	at com.icegreen.greenmail.smtp.commands.DataCommand.execute(DataCommand.java:54)
	at com.icegreen.greenmail.smtp.SmtpHandler.handleCommand(SmtpHandler.java:92)
	at com.icegreen.greenmail.smtp.SmtpHandler.run(SmtpHandler.java:46)
	at com.icegreen.greenmail.server.AbstractServer.lambda$handleClientSocket$0(AbstractServer.java:165)
	at java.base/java.lang.Thread.run(Thread.java:833)

@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
class JavaMailSenderIT {

  @RegisterExtension
  static GreenMailExtension greenMail = new GreenMailExtension(ServerSetupTest.SMTP)
    .withConfiguration(GreenMailConfiguration.aConfig().withUser("duke", "springboot"))
    .withPerMethodLifecycle(false);

  @Autowired
  private JavaMailSender javaMailSender;

  @Test
  void shouldUseGreenMail() {

    SimpleMailMessage mail = new SimpleMailMessage();
    mail.setFrom("[email protected]");
    mail.setSubject("A new message for you");
    mail.setText("Hello GreenMail!");
    mail.setTo("[email protected]");

    javaMailSender.send(mail);

    // awaitility
    await().atMost(2, SECONDS).untilAsserted(() -> {
      MimeMessage[] receivedMessages = greenMail.getReceivedMessages();
      assertEquals(1, receivedMessages.length);

      MimeMessage receivedMessage = receivedMessages[0];
      assertEquals("Hello GreenMail!", GreenMailUtil.getBody(receivedMessage));
      assertEquals(1, receivedMessage.getAllRecipients().length);
      assertEquals("[email protected]", receivedMessage.getAllRecipients()[0].toString());
    });
  }

[marcelmay]

Hi @sreyasvpariyath ,

which Spring Boot version do you use?

• For Spring Boot 3, see Cannot use Greenmail with Spring Boot 3 #512 : Excluding one of the conflicting Jakarta Activation implementations might fix this.
• See example https://github.com/greenmail-mail-test/greenmail-example-spring-boot-3

[sreyasvpariyath]

Hi @marcelmay
Thanks it seems working.