Spring MVC - Send email, Bean creation - email

Question

I'm trying to set up my Spring MVC app to send email, but i think i'm doing something wrong in the configuration
In My AppConfig i instantiate the Bean:
#Bean
public JavaMailSender mailSender() {
JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
mailSender.setDefaultEncoding("UTF-8");
return mailSender;
}
Then in my application.properties I have:
mail.port= 465
mail.host= smtp.gmail.com
mail.username= username
mail.password= password
emailTo = info#beingsmart.it
emailSubject = ALERT - ePark Server
mail.smtp.auth = true
mail.smtp.starttls.enable = true
mail.properties.mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory
mail.properties.mail.smtp.socketFactory.fallback = false
When I try to send the email i'm getting
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.mail.javamail.JavaMailSender]: Factory method 'mailSender' threw exception; nested exception is java.lang.NoClassDefFoundError: javax/mail/AuthenticationFailedException
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588)
... 49 more
Caused by: java.lang.NoClassDefFoundError: javax/mail/AuthenticationFailedException
at it.besmart.config.AppConfig.mailSender(AppConfig.java:128)
at it.besmart.config.AppConfig$$EnhancerBySpringCGLIB$$b2a09c0.CGLIB$mailSender$7(<generated>)
at it.besmart.config.AppConfig$$EnhancerBySpringCGLIB$$b2a09c0$$FastClassBySpringCGLIB$$dd65f050.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:318)
at it.besmart.config.AppConfig$$EnhancerBySpringCGLIB$$b2a09c0.mailSender(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162)
... 50 more
Caused by: java.lang.ClassNotFoundException: javax.mail.AuthenticationFailedException
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1285)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1119)
... 61 more
EDIT
I added javax mail to my pom
<dependency>
<groupId>javax.mail</groupId>
<artifactId>javax.mail-api</artifactId>
<version>1.5.6</version>
</dependency>
Now I have a different exception when trying to send the email
java.lang.NoClassDefFoundError: com/sun/mail/util/MessageRemovedIOException
It looks like an authentication error, but i'm thinking that JavaMailSender does not takes the setting in my application.properties, could it be?
Thanks

Answer 1

It seems to be missing dependency rather than anything else. If using spring boot have dependency like:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-mail</artifactId>
</dependency>
If you don't I suggest you look inside that POM and figure out what are the missing pieces.
In your particular case it seems you need:
<dependency>
<groupId>com.sun.mail</groupId>
<artifactId>javax.mail</artifactId>
<version>1.5.5</version>
</dependency>
Generic advice:
ClassNotFoundException means class which you need is not on classpath. It's usually a missing dependency
Google to find which jar contains the missing class
Find the library it on maven central
Add to dependencies