Java.lang.NoClassDefFoundError: javax / mail / MessagingException not resolved

Question

I'm trying to add javax.mail jar to my classpath, but getting 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 read in another post that it would be possible to fix the addition of dependecy in pom.xml, so I did this:

pom.xml

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

But still I get an error message .. can someone help me?

Answer 1

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

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

Answer 2

javax/mail/MessagingException already exists in version 1.4. So I assume this is just a build problem in the IDE. Mastering the pom dependencies and checking the artifact generated by the IDE should be sufficient.

Answer 3

You must add the jar to the Tomcat server.

1. Open launch configuration

   

2. Add external jar (look for the jar with email)

   

Answer 4

The latest version of the Java Mail API is

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

Are you getting the same error with this version?

Answer 5

This class is present in all versions of Javamail that I have ever used. Obviously, you do not have Javamail JAR files on your CLASSPATH, as with any other ClassNotFoundException.

Answer 6

You mixed the classpath with maven and manually added the links in eclipse.

Disable "maven nature" so that the mvn eclipse:clean command on the command line updates your project and convert it to maven project , and then try again.

To clear: where did you add api mail to pom? under <dependecies> or under <dependecyManagement ?

Answer 7

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

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

2. If this does not work, manually place the jar file in the .m2\repository\javax\<folder>\<version>\ directory.

Answer 8

You will use the maven-dependency-plugin to copy project dependencies to another location.

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> 

The following manifest file will be created. 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 

It worked for me. Source: MKyong.com