Spring JavaMailSenderImpl throws an TypeMismatchException - spring

Question

I configured JavaMail with Spring framework using JavaMailSenderImpl in my application.Actually I tried to load mailing properties from database and done little bit changes at spring config.xml file.
But i got error
"Initialization of bean failed; nested exception is
org.springframework.beans.TypeMismatchException: Failed to convert
property value of type [com.core.springexamples.UCMSMailImpl] to
required type [org.springframework.mail.MailSender] for property
'mailSender'; nested exception is java.lang.IllegalArgumentException:
Cannot convert value of type [com.core.springexamples.UCMSMailImpl] to
required type [org.springframework.mail.MailSender] for property
'mailSender': no matching editors or conversion strategy found"
whatever changes are implemented in my application,those are mentioned in below.
Step 1:
<bean id="javaMailImpl" class="org.springframework.mail.javamail.JavaMailSenderImpl"></bean>
Step 2:-
<bean id="mailSender" class="com.core.springexamples.UCMSMailImpl" scope="prototype" init-method="configuredProperties">
<property name="javaMailImpl" ref="javaMailImpl"></property>
</bean>
com.core.springexamples.UCMSMailImpl:-
public class UCMSMailImpl {
private JavaMailSenderImpl javaMailImpl;
private ConfigDAO configDAO;
public void configuredProperties(){
System.out.println("UCMSMailImpl::configuredProperties");
Properties props=new Properties();
String[] mildata=configDAO.getMailingPropData();
props.put("mail.smtp.auth", mildata[0]);
props.put("mail.smtp.starttls.enable", mildata[2]);
props.put("mail.smtp.host", mildata[3]);
props.put("mail.smtp.port", mildata[4]);
props.put("mail.smtp.host", mildata[5]);
props.put("username", mildata[6]);
props.put("password",mildata[7]);
getJavaMailImpl().setJavaMailProperties(props);
}
public JavaMailSenderImpl getJavaMailImpl() {
return javaMailImpl;
}
public void setJavaMailImpl(JavaMailSenderImpl javaMailImpl) {
this.javaMailImpl = javaMailImpl;
}
public void setConfigDAO(ConfigDAO configDAO){
this.configDAO=configDAO;
}
public ConfigDAO getConfigDAO(){
return configDAO;
}
Step 3:-I am trying send the mail from MailSender.send using UCMSMailImpl java class.I refered the UCMSMailImpl bean.
<bean id="sendMail" class="com.core.springexamples.JavaMailing">
<property name="mailSender" ref="mailSender"></property>
</bean>
public class JavaMailing {
private MailSender mailSender;
public void sendMail(String from,String to,String text,String subject){
SimpleMailMessage message = new SimpleMailMessage();
message.setFrom(from);
message.setTo(to);
message.setSubject(subject);
message.setText(text);
mailSender.send(message);
}
/**
* #return the mailSender
*/
public MailSender getMailSender() {
return mailSender;
}
/**
* #param mailSender the mailSender to set
*/
public void setMailSender(MailSender mailSender) {
this.mailSender = mailSender;
}
Step 4:- I trying to test the sendMail bean
ApplicationContext context =new ClassPathXmlApplicationContext("applicationContext-mail.xml");
JavaMailing m=(JavaMailing)context.getBean("sendMail");
m.sendMail("john.ch#gmail.com", "john.c#gmail.com", "TEST MAIL", "TEST MAIL");
But i got exception is TypeMismatchException: Failed to convert property value of type [com.core.springexamples.UCMSMailImpl] to required type [org.springframework.mail.MailSender] for property
Please help me.

Answer 1

You cannot assign a class to an interface, if it doesn't implement the interface. UCMSMailImpl does not implement MailSender. Keep the rest as it is and change your UCMSMailImpl like this:
public class UCMSMailImpl implements MailSender {
private JavaMailSenderImpl javaMailImpl;
private ConfigDAO configDAO;
// do your property initialization
// ...
// implement interface methods
void send(SimpleMailMessage simpleMessage) throws MailException {
this.javaMailImpl.send(simpleMessage);
}
void send(SimpleMailMessage[] simpleMessages) throws MailException {
this.javaMailImpl.send(simpleMEssages);
}
}
If you cannot change UCMSMailImpl, extend it:
public class MyUCMSMailImpl extends UCMSMailImpl implements MailSender {
void send(SimpleMailMessage simpleMessage) throws MailException {
this.getgetJavaMailImpl().send(simpleMessage);
}
void send(SimpleMailMessage[] simpleMessages) throws MailException {
this.getgetJavaMailImpl().send(simpleMEssages);
}
}
and change your configuration:
<bean id="mailSender" class="your.package.MyUCMSMailImpl" scope="prototype" init-method="configuredProperties">
<property name="javaMailImpl" ref="javaMailImpl"></property>
</bean>