spring mvc send email (javamail) exception not getting caught - email

Question

I am trying to send an email but before I was getting a nullpointerexception error which was due to mailSender not getting set correctly, now I edited the code as it is shown below and I am not getting any exception but the code breaks at the line
MimeMessage message = mailSender.createMimeMessage();
Here is my code (both sendMail() and addNewAlarm() are inside the same class "ElementService"):
public class ElementService implements ApplicationContextAware {
private ApplicationContext ac;
public void sendMail(String toAddress, String subject, String body) throws Exception{
JavaMailSender mailSender = (JavaMailSender) ac.getBean("mailSender");
MimeMessage message = mailSender.createMimeMessage();
try{
MimeMessageHelper helper = new MimeMessageHelper(message, true);
helper.setFrom("xxx#gmail.com");
helper.setTo(toAddress);
helper.setSubject(subject);
helper.setText(body);
}catch (MessagingException e) {
throw new MailParseException(e);
}
try{
mailSender.send(message);
}
catch(Exception e){
throw e;
}
}
//I want an email to be sent every 30 seconds
#Scheduled(fixedDelay = 30*1000)
public void function2RepeatEvery30Seconds()
{
MailService mailer = (MailService) ac.getBean("mailService");
mailer.sendMail("xxx#hotmail.com","subject","body");
//does other stuff..
}
#Override
public void setApplicationContext(ApplicationContext ac) throws BeansException {
this.ac = ac;
}
}
These are the beans in my xml:
<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
<!-- SMTP settings -->
<property name="host" value="smtp.gmail.com" />
<property name="port" value="587" />
<property name="username" value="***#gmail.com" />
<property name="password" value="*****" />
<property name="javaMailProperties">
<!-- additional properties specific to JavaMail -->
<props>
<prop key="mail.transport.protocol">smtp</prop>
<prop key="mail.smtp.auth">true</prop>
<prop key="mail.smtp.starttls.enable">true</prop>
</props>
</property>
</bean>
In debug mode I can see that mailSender has been set according to the properties shown on the mailSender bean.

Answer 1

I finally did it!! Thanks to Serge Ballesta of course. I should have been using log4j all along... I researched the Exception MessageRemovedIOException and I found this post java.lang.NoClassDefFoundError: com/sun/mail/util/MailLogger for JUnit test case for Java mail where there is a suggestion in the comments to change
<dependency> <groupId>javax.mail</groupId> <artifactId>javax.mail-api</artifactId> <version>1.5.2</version> </dependency>
to
<dependency> <groupId>com.sun.mail</groupId> <artifactId>javax.mail</artifactId> <version>1.5.2</version> </dependency>
I also had to change this:
<prop key="mail.smtp.starttls.enable">true</prop>
to this:
<prop key="mail.smtp.starttls.enable">false</prop>
Thank you very much for your time and advice #Serge Ballesta!

Answer 2

Ok, obviously the mailSender is null which causes the error. My guess would be that your #Autowired annotation is not processed. Do you have AutowiredAnnotationBeanPostProcessor registered? You can do that for example by using <context:annotation-config /> in your Spring configuration.
Other option (without using #Autowired) is to manually specify the dependency on mailSender in your mailService bean definition like so:
<bean id="mailService" class="gr.mobics.allweb.service.MailService" scope="singleton">
<property name="mailSender" ref="mailSender" />
</bean>
I have not tested this, but it seems like this is the cause of your problem. If these solutions don't work you, leave a comment and I'll try to update the answer.