java.lang.IllegalStateException: Not provider of jakarta.mail.util.StreamProvider was found

[viragpurnam]

Describe the bug
I am updating my project dependencies from com.sun.mail:jakarta.mail (2.0.1) to jakarta.mail-api and angus-mail.
But after doing changes in pom.xml. I get the below error.

java.lang.IllegalStateException: Not provider of jakarta.mail.util.StreamProvider was found
	at jakarta.mail.util.FactoryFinder.find(FactoryFinder.java:64)
	at jakarta.mail.util.StreamProvider.provider(StreamProvider.java:186)
	at jakarta.mail.Session.<init>(Session.java:254)
	at jakarta.mail.Session.getDefaultInstance(Session.java:381)

[jbescos]

Could you run the next and copy-paste the output?:

mvn dependency:tree

[viragpurnam]

Hi @jbescos: Some how dependency tree is not working for this module alone.
I have attached a code snippet, which is responsible. It works good when I use com.sun.mail:jakarta.mail or org.eclipse.angus:jakarta.mail.

public void sendEMail(String subject, String content) throws MessagingException {
		Properties props = new Properties();
		props.put("mail.smtp.starttls.enable", getSmtpSTARTTLS());
		Session session = Session.getInstance(props, null);
		UserPassword credentials = getSmtpCredentials();
		URLName urlName = createURLName(credentials);
		session.setPasswordAuthentication(urlName,
				new PasswordAuthentication(credentials.getUser(), credentials.getPassword()));
		if (Environment.isDebug()) {
			session.setDebug(true);
		}

		Message msg = new MimeMessage(session);
		if (getFrom() != null && getFrom().length() > 0) {
			msg.setFrom(new InternetAddress(getFrom()));
		}
		if (getTo() != null && getTo().length() > 0) {
			msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(getTo(), false));
		}
		if (getCc() != null && getCc().length() > 0) {
			msg.setRecipients(Message.RecipientType.CC, InternetAddress.parse(getCc(), false));
		}
		msg.setSubject(subject);
		msg.setText(content);
		msg.setHeader("X-Mailer", MAILER); //$NON-NLS-1$
		msg.setSentDate(new Date());

		// send the thing off
		Transport transport = session.getTransport(urlName);
		transport.connect();
		transport.sendMessage(msg, msg.getAllRecipients());
		transport.close();
	}

[viragpurnam]

In Session.java there is call for StreamProvider, and that is creating an issue in my case.

// Constructor is not public
  private Session(Properties props, Authenticator authenticator) {
  	this.props = props;
  	this.authenticator = authenticator;
  	this.streamProvider = StreamProvider.provider();
  
  	if (Boolean.valueOf(props.getProperty("mail.debug")).booleanValue())
  	    debug = true;
  
  	initLogger();
  	logger.log(Level.CONFIG, "Jakarta Mail version {0}", Version.version);
  
  	// get the Class associated with the Authenticator
  	Class<?> cl;
  	if (authenticator != null)
  	    cl = authenticator.getClass();
  	else
  	    cl = this.getClass();
  	// load the resources
  	loadProviders(cl);
  	loadAddressMap(cl);
  	q = new EventQueue((Executor)props.get("mail.event.executor"));
  }

[jbescos]

That error means that it cannot find the implementation of jakarta.mail.util.StreamProvider, that is supposed to exist in angus-mail.

It seems to me that angus-mail dependency is not available in runtime. We would need to get the classpath/modulepath of your java process.

Try to remove any mail/angus-mail dependency you have in the pom, and just add this one (it will bring any required dependency transitively):

		<dependency>
			<groupId>org.eclipse.angus</groupId>
			<artifactId>angus-mail</artifactId>
			<version>2.0.1</version>
		</dependency>

If this does not work, then remove it and add this other (that contains mail and angus-mail within the same jar):

		<dependency>
			<groupId>org.eclipse.angus</groupId>
			<artifactId>jakarta.mail</artifactId>
			<version>2.0.1</version>
		</dependency>

If none of previous solutions work, are you able to provide the classpath/modulepath of the java process?.

[viragpurnam]

Hi @jbescos,
Adding jakarta.mail works as I already said in my previous comment.

                <dependency>
			<groupId>org.eclipse.angus</groupId>
			<artifactId>jakarta.mail</artifactId>
			<version>2.0.1</version>
		</dependency>

But we would like to use angus-mail as the source code is available in Github and that is needed for compliance activities. I do not see jakarta.mail source code in Github. Do you know where the source code for jakarta.mail has been hosted? How to bind the jakarta.mail-api and angus-mail? Some how it is not finding the implementation.

[jbescos]

jakarta.mail sources are here: https://github.com/jakartaee/mail-api

You don't have to do anything to bind jakarta.mail-api with angus-mail. They must exist in the modulepath/classpath and thats all. If it is not working, it could be related to some issue with the classloaders, or simply angus-mail is not in the modulepath/classpath.

Is your app an standalone application, or is it deployed in a web container like Weblogic, Websphere?. What is the JRE that you are using?.

[viragpurnam]

Hi @jbescos, https://github.com/jakartaee/mail-api this link has source code for just the api. Not the implementation.
Application is standalone and we are using java 11.

[jbescos]

The implementation is already in this project where you are creating this issue:
https://github.com/eclipse-ee4j/angus-mail

org.eclipse.angus:jakarta.mail comes from this module of here. It creates a jar file containing the implementation (of angus-mail) and the jakarta.mail-api.

Could you check that angus-mail is in the classpath/modulepath of your application when it is executed?. It seems it is not there.

[viragpurnam]

Thanks @jbescos. I am checking that. I will update you.

[viragpurnam]

Hi @jbescos, Thanks a lot for your help. I feel I can use the below mentioned dependencies in my application as suggested by you. It works fine.

                <dependency>
			<groupId>org.eclipse.angus</groupId>
			<artifactId>jakarta.mail</artifactId>
			<version>2.0.1</version>
		</dependency>

[jmehrens]

Closing this with no changes required to the code base. Shouldn't have to note this in the changes.txt because no commits were issued.

[ole1986]

Possible reason for the mentioned issue can also be when calling the send mail method in an asynchrone thread

[turboezh]

Sorry for commenting closed issue.
I found that sending a mail from a ForkJoinPool thread in a packaged jar (Spring Boot) causes Not provider of jakarta.mail.util.StreamProvider was found. Maybe it could be related.

[vionta]

Hi,
I’m getting this weird error.

I was getting the “java.lang.IllegalStateException: Not provider of jakarta.mail.util.StreamProvider was found”. The code worked before jakarta/angus update and also works in the IDE but not in the system (ant task + zulu 17).

I assumed there were classpath issues so I checked everything I could think off, checked several versions, major class versions (52), everything on a single jar (maven shade plugin). The class was there (org.eclipse.angus.mail.util.MailStreamProvider), opened the jar and checked.

So this is what I saw. I verified that I could add the name of the stream provider to the system properties and change the FactoryFinder strategy to a newInstance, but this also didn’t work.

System.setProperty("jakarta.mail.util.StreamProvider", "org.eclipse.angus.mail.util.MailStreamProvider");

Both Service based location (factoryFromServiceLoader) and newInstance are not working on FactoryFinder find method. I add code to test the problem and output below this lines where it seems that the class is there but the ServiceBasedLocation and instance is failing.

For me, after what I saw, I can download a copy of the jar and force regular old style forName + newInstance on FactoryFinder newInstance.

At the end it may probably be a simple classloading problem, a typpo or similar. I couldn’t find it. Hope that this is helpful somehow.
If you want me to check the changes and propose and update I would be pleased.

Kind Regards.

LOG
INFO: Delete Mode : false
WARNING: Testing class loading
WARNING: Trying the Service Loader code from FactoryFinder Class on the environment
WARNING: ServiceLoader.load does not return any results
WARNING: Trying the newInstance code from Factory Finder
WARNING: Using loadClass:
SEVERE: New Instance also didn't suceed.
SEVERE: java.lang.ClassNotFoundException: org.eclipse.angus.mail.util.MailStreamProvider
WARNING: Trying a simple new clause:
WARNING: With a new clause: org.eclipse.angus.mail.util.MailStreamProvider@146044d7
WARNING: WUT (): org.eclipse.angus.mail.util.MailStreamProvider@146044d7
WARNING: Trying a simple forName (Deprecated) newInstance
WARNING: Class For Name Instance Class: org.eclipse.angus.mail.util.MailStreamProvider@1e9e725a
WARNING: Is the instance assignable from StreamProvider: true
WARNING: Trying getConstructor newInstance:
WARNING: It works : org.eclipse.angus.mail.util.MailStreamProvider@15d9bc04
WARNING: But with : classLoader.loadClass
SEVERE: Does not work
SEVERE: java.lang.ClassNotFoundException: org.eclipse.angus.mail.util.MailStreamProvider
WARNING: ****
WARNING: Following with usual code : Session session = Session.getInstance(getProps(), null);
java.lang.IllegalArgumentException: Cannot instance org.eclipse.angus.mail.util.MailStreamProvider
at jakarta.mail.util.FactoryFinder.newInstance(FactoryFinder.java:77)

Testing Code
private void logServiceLoader() {
try {
LOG.warn("Testing class loading");
LOG.warn("Trying the Service Loader code from FactoryFinder Class on the environment");
ServiceLoader sl = ServiceLoader.load(jakarta.mail.util.StreamProvider.class);
Iterator iter = sl.iterator();
if (iter.hasNext()) {
LOG.warn("Looking for Service Instance with JDK (Zulu 17) ServiceLoader :");
LOG.warn("Found: " + iter.next().getClass());
} else {
LOG.warn("ServiceLoader.load does not return any results");
}
} catch (Exception e) {
LOG.error(e);
}

	LOG.warn("Trying the newInstance code from Factory Finder");
	ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
	Class clazz = null;
	try {
		if (classLoader == null) {
			LOG.warn(" Using class forName on org.eclipse.angus.mail.util.MailStreamProvider : ");
			clazz = (Class) Class.forName("org.eclipse.angus.mail.util.MailStreamProvider");
		} else {
			LOG.warn(" Using loadClass: ");
			clazz = (Class) classLoader.loadClass("org.eclipse.angus.mail.util.MailStreamProvider");
		}
		LOG.warn(" Found Class: " + clazz);
		Object o = clazz.getConstructor().newInstance();
		LOG.warn(" Instance: " + o);
	} catch (ReflectiveOperationException e) {
		LOG.error("New Instance also didn't suceed.");
		LOG.error(e);
	}

	try {
		LOG.warn("Trying a simple new clause: ");
		org.eclipse.angus.mail.util.MailStreamProvider msp = new MailStreamProvider();
		LOG.warn("With a new clause: " + msp);
		LOG.warn("WUT (<x><x>): " + msp);

	} catch (Exception e) {
		LOG.error(e);
	}

	try {
		LOG.warn("Trying a simple forName (Deprecated) newInstance");
		Class<?> classFromforName = Class.forName("org.eclipse.angus.mail.util.MailStreamProvider");
		Object newInstance = classFromforName.newInstance();
		LOG.warn("Class For Name Instance Class: " + newInstance);
		boolean assignableFrom = jakarta.mail.util.StreamProvider.class.isAssignableFrom(newInstance.getClass());
		LOG.warn("Is the instance assignable from StreamProvider: " + assignableFrom);
		LOG.warn("Trying getConstructor newInstance: " );
		LOG.warn(" It works : " + classFromforName.getConstructor().newInstance());
		LOG.warn(" But with : classLoader.loadClass " );
		Class<?> loadClass = classLoader.loadClass("org.eclipse.angus.mail.util.MailStreamProvider");
		LOG.warn(" .. getting instance : "+loadClass.getConstructor().newInstance());
		 
	} catch (Exception e) {
		LOG.error(" Does not work ");
		LOG.error(e);
	}
	LOG.warn(" **** ");
	LOG.warn(" Following with usual code : Session session = Session.getInstance(getProps(), null);");

}

[jmehrens]

@ole1986, @turboezh @vionta
PR 701 in JakartaMail should fix this issue that you are seeing with the async.

jakartaee/mail-api#701

[yoruritchie]

com.sun.mail jakarta.mail 2.0.1 com.sun.activation jakarta.activation 2.0.1