Intellij not recognizing javax.mail imports but project is building fine - intellij-idea

Question

I am using javax.mail library in my project. My project is building fine using - mvn clean install, but when i try to debug my Intellij IDE shows error and it is not able to recognize the javax.mail imports. I have restarted my IDE from FILE -> Invalidate Caches and restart,still no luck.
These are not getting recognized by intellij IDEA,stating unused imports. I am using below the depeendency versions as:- javax.activation - 1.1.1 and javax.mail - 1.4.
Because the project is building fine,i believe the problem lies in some IDE setting.Kindly let me know if this can be resolved.

Answer 1

Try this maven dependency:
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4</version>
<scope>provided</scope> <!-- add this only if code will run in a java container (i.e. tomcat, etc)-->
</dependency>
And you should also see the mail classes under External Libraries -> Maven:javax.mail:mail:1.4 -> mail-1.4.jar -> javax.mail
There are also newer versions of the java mail dependency you can use, like 1.4.7 or 1.5.0-b01
The latest version (as pointed out by #Mark Rotteveel) is 1.6.3 and the maven coordinates have changed to jakarta:
<dependency>
<groupId>com.sun.mail</groupId>
<artifactId>jakarta.mail</artifactId>
<version>1.6.3</version>
</dependency>
Based on your code I have created a simplified project version with only two files; pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.test</groupId>
<artifactId>message-test</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4.7</version>
</dependency>
</dependencies>
</project>
and SendMail.java
package com.test;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Properties;
public class SendMail {
public static void main(String[] args) {
sendMail(new Exception("Problem with cable"));
}
public static void sendMail(Exception exception) {
String to = "destination#test.com";
String from = "sender#test.com";
String host = "smtp.test.com";
Properties properties = System.getProperties();
properties.setProperty("mail.smtp.host", host);
Session session = Session.getDefaultInstance(properties);
try {
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));
message.setRecipient(Message.RecipientType.TO, new InternetAddress(to));
message.setSubject("Trade-processor instance shutdown!");
message.setText(getExceptionMessage(exception));
Transport.send(message);
} catch (MessagingException mex) {
mex.printStackTrace();
}
}
private static String getExceptionMessage(Exception e) {
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
return sw.toString();
}
}
Make sure your 'java' source folder is marked as source (right click on it and select 'Mark directory as -> sources root' if it is not already light blue)
Make sure the class package (com.test) names match i.e. 'src/main/java/com/test/SendMail' on the project pane and 'package com.test' in SendMail.java