title: java.lang.LinkageError: loader constraint violation:previously initiated loading for a different type with name "javax/mail/Session"
body: <p>I am getting the following error when I try to send email using <code>javax.mail-api</code>:</p>
  
  <pre><code>Caused by: java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/felix/framework/BundleWiringImpl$BundleClassLoaderJava5) previously initiated loading for a different type with name "javax/mail/Session"
          at java.lang.ClassLoader.defineClass1(Native Method)
          at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
          at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.findClass(BundleWiringImpl.java:2279)
          at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1501)
          at org.apache.felix.framework.BundleWiringImpl.access$400(BundleWiringImpl.java:75)
          at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1955)
          at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
          at com.sun.mail.util.PropUtil.getBooleanSessionProperty(PropUtil.java:86)
          at javax.mail.internet.MimeMessage.initStrict(MimeMessage.java:320)
          at javax.mail.internet.MimeMessage.&lt;init&gt;(MimeMessage.java:195)
          at sendEmail(manage.java:216)
          at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
          at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:606)
          at org.apache.camel.component.bean.MethodInfo.invoke(MethodInfo.java:408)
          at org.apache.camel.component.bean.MethodInfo$1.doProceed(MethodInfo.java:279)
          at org.apache.camel.component.bean.MethodInfo$1.proceed(MethodInfo.java:252)
  </code></pre>
  
  <p>Code:</p>
  
  <pre><code>Public void sendEmail() {
      String to = "abc@abc.com";
      String from = "efg@efg.com";
      final String username = "abc@abc.com";
      final String password = "password";
      Properties properties = new Properties();
      properties.put("mail.smtp.auth", "true");
      properties.put("mail.smtp.starttls.enable", "true");
      properties.put("mail.smtp.host", "smtp.office365.com");
      properties.put("mail.smtp.port", "587");
      Session session = Session.getInstance(properties, new javax.mail.Authenticator() {
          protected PasswordAuthentication getPasswordAuthentication() {
              return new PasswordAuthentication(username, password);
          }
      });
      try {
          System.out.println("Inside test");
          Message message = new MimeMessage(session);
          message.setFrom(new InternetAddress(from));
          message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
          message.setSubject("Testing Subject");
          message.setText("This is message body");
          Transport.send(message);
          System.out.println("Sent message successfully....");
       } catch (MessagingException e) {
           throw new RuntimeException(e);
       }
  }
  </code></pre>
  
  <p>My maven dependency:</p>
  
  <pre><code>&lt;dependency&gt;
      &lt;groupId&gt;javax.mail&lt;/groupId&gt;
      &lt;artifactId&gt;javax.mail-api&lt;/artifactId&gt;
      &lt;version&gt;1.5.5&lt;/version&gt;
  &lt;/dependency&gt;
  </code></pre>
  
  <p>Please help.</p>