Enviando e-mail pelo Spring!

Olá pessoal.

Agora que eu consegui entender a filosofia do Spring hehe. Estou tentando fazer uma classe para enviar e-mail. Eu fiz as seguintes classes:

SpringMail.java

public class SpringMail {

	private JavaMailSender mailSender;
	
	public void setMailSender(JavaMailSender mailSender) {
		this.mailSender = mailSender;
	}
	
	public void send() {
		System.out.println("coisando...");
		
		SimpleMailMessage msg = new SimpleMailMessage();

		msg.setFrom("TestCase <[email removido]>");
		msg.setText("texticulo de teste");

		msg.setTo("[email removido]");
		msg.setSubject("titulo do email");
		msg.setSentDate(new Date());
		
		try {
			mailSender.send(msg);
		} catch (MailException ex) {
			ex.printStackTrace();
		}
	}

}

applicationContext-javamail.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
   "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

	<bean id="mailSender" autowire="byName"
		class="org.springframework.mail.javamail.JavaMailSenderImpl">
		<property name="host">
			<value>mail.meuhost.com.br</value>
		</property>
	</bean>

	<bean id="springMail" autowire="byName"
		class="br.org.articulus.server.SpringMail">

		<property name="mailSender">
			<ref bean="mailSender" />
		</property>
		
	</bean>

</beans>

E fiz um testcase bem básico só pra testar o método:

public class SpringMailTest extends AbstractSpringContextTests {

	private SpringMail springMail;
	
	public void setSpringMail(SpringMail springMail) {
		this.springMail = springMail;
	}
	
	protected void setUp() throws Exception {
		loadContext(new String[] {"applicationContext-javamail.xml"});
	}
	
	public void testSend() {
		springMail.send();
	}
	
	protected ConfigurableApplicationContext loadContext(Object arg0)
			throws Exception {
		return new ClassPathXmlApplicationContext((String[])arg0);
	}

}

Quando eu rodo o testCase ele retorna o seguinte erro:

Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 1.408 sec <<< FAILURE! testSend(br.org.articulus.server.SpringMailTest) Time elapsed: 1.249 sec <<< ERROR! java.lang.NullPointerException at br.org.articulus.server.SpringMailTest.testSend(SpringMailTest.java:20) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at junit.framework.TestCase.runTest(TestCase.java:168) at junit.framework.TestCase.runBare(TestCase.java:134) at org.springframework.test.ConditionalTestCase.runBare(ConditionalTestCase.java:76) at junit.framework.TestResult$1.protect(TestResult.java:110) at junit.framework.TestResult.runProtected(TestResult.java:128) at junit.framework.TestResult.run(TestResult.java:113) at junit.framework.TestCase.run(TestCase.java:124) at junit.framework.TestSuite.runTest(TestSuite.java:232) at junit.framework.TestSuite.run(TestSuite.java:227) at org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:81) at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:62) at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:140) at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:127) at org.apache.maven.surefire.Surefire.run(Surefire.java:177) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:345) at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1009)

Quando eu inicio o testCase, ele carrega os beans, eu acho que ele não está injetando porque nem o método send() ele executa. Vejam a saída do Spring:

Running br.org.articulus.server.SpringMailTest 07/07/2008 11:01:57 org.springframework.context.support.AbstractApplicationContext prepareRefresh INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@197d257: display name [org.springframework.context.support.ClassPathXmlApplicationContext@197d257]; startup date [Mon Jul 07 11:01:57 BRT 2008]; root of context hierarchy 07/07/2008 11:01:58 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions INFO: Loading XML bean definitions from class path resource [applicationContext-javamail.xml] 07/07/2008 11:01:58 org.springframework.context.support.AbstractApplicationContext obtainFreshBeanFactory INFO: Bean factory for application context [org.springframework.context.support.ClassPathXmlApplicationContext@197d257]: org.springframework.beans.factory.support.DefaultListableBeanFactory@1893efe 07/07/2008 11:01:58 org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons INFO: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1893efe: defining beans [mailSender,springMail]; root of factory hierarchy

Alguém me ajuda a resolver esse mistério?

Mistério nenhum! SpringMailTest NÃO é bean do Spring, e este não tem obrigação nenhuma de injetar alguma coisa. A primeira classe que obtém o bean, deve sempre buscá-lo à mão. Assim:

public class SpringMailTest extends AbstractSpringContextTests {

	private ConfigurableApplicationContext ctx;
	
	public SpringMail getSpringMail() {
		return (SpringMail) ctx.getBean("springMail");
	}
	
	protected void setUp() throws Exception {
		ctx = loadContext(new String[] {"applicationContext-javamail.xml"});
	}
	
	public void testSend() {
		getSpringMail().send();
	}
	
	protected ConfigurableApplicationContext loadContext(Object arg0)
			throws Exception {
		return new ClassPathXmlApplicationContext((String[])arg0);
	}
}

Repare, nem compilei pra ver se funciona.

Só achei estranho a ausência de interface para a classe SpringMail, porque você sempre injeta uma classe para atributo interface, para ganhar flexibilidade. Se não fizer isso, não há justificativa para usar Spring, bastaria dar new direto.

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