java.lang.NoClassDefFoundError: javax/mail/MessagingException unsolved

Question

I'm trying to add the javax.mail jar to my classpath but I get this error:

java.lang.NoClassDefFoundError: javax/mail/MessagingException
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2663)
    at java.lang.Class.getDeclaredConstructors(Class.java:2012)
    at org.springframework.beans.factory.annotation.

I've readed in other post that it could be fixed adding the dependecy to the pom.xml, so I did it:

pom.xml

<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mail</artifactId>
    <version>1.4.3</version>
</dependency>

But still I'm getting the error ..can someone help me with this?

Answer 1

Also with the 1.4.3 version there is no longer an artifact id called mail. If you want to use 1.4.3 you should use this dependency

<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>mailapi</artifactId>
    <version>1.4.3</version>
</dependency>

Answer 2

the javax/mail/MessagingException already exists in version 1.4. So I guess this is just an assembly issue within the IDE. Refreshing the pom dependencies and checking the artifact the IDE builds up should be sufficient.

Answer 3

You should add the jar to the server Tomcat.

1. Open launch configuration

   

2. Add external jar (look for your email jar)

   

Answer 4

The most recent version of the Java Mail API is

<dependency>
    <groupId>javax.mail</groupId>
    <artifactId>javax.mail-api</artifactId>
    <version>1.5.2</version>
</dependency>

Do you get the same error with this version?

Answer 5

This class has been present in all versions of Javamail I have ever used. Clearly you don't have the Javamail JAR(s) on your CLASSPATH, as for any other ClassNotFoundException.

Answer 6

You mixed the classpath by using maven and manually added references in eclipse.

Disable the "maven nature" make a mvn eclipse:clean on commandline refresh your project and convert it to maven project and then try again.

To clearify: Where have you added the mail api in pom? under <dependecies> or under <dependecyManagement ?

Answer 7

Even I was facing a similar error. Try below 2 steps (the first of which has been recommended here already) - 1. Add the dependency to your pom.xml

         <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4.3</version>
        </dependency>

2. If that doesn't work, manually place the jar file in your .m2\\repository\\javax\\<folder>\\<version>\\ directory.

Answer 8

You will use maven-dependency-plugin to copy project dependencies to somewhere else.

Add this to pom.xml

 <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <version>2.4</version>
    <configuration>
      <archive>
        <manifest>
        <addClasspath>true</addClasspath>
        <mainClass>com.mkyong.core.App</mainClass>
        <classpathPrefix>dependency-jars/</classpathPrefix>
        </manifest>
      </archive>
    </configuration>
  </plugin>
  <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <version>2.5.1</version>
    <executions>
      <execution>
        <id>copy-dependencies</id>
        <phase>package</phase>
        <goals>
            <goal>copy-dependencies</goal>
        </goals>
        <configuration>
            <outputDirectory>
                          ${project.build.directory}/dependency-jars/
                    </outputDirectory>
        </configuration>
        </execution>
    </executions>
  </plugin>

Following manifest file will be generated. The project dependencies will be copied to {project}/target/dependency-jars/.

manifest-Version: 1.0
Built-By: mkyong
Build-Jdk: 1.6.0_35
Class-Path: dependency-jars/log4j-1.2.17.jar
Created-By: Apache Maven
Main-Class: com.mkyong.core.App
Archiver-Version: Plexus Archiver

This worked for me. Source: MKyong.com

Answer 9

I had similar problem with javax.mail.Activator class. Solution was delete from war javax.mail and javax.activation and add it on {tomcat}\\lib folder