java lang NoClassDefFoundError javax mail Authenticator whats wrong

Question

Send to Email java  package helper     Mail java - smtp sending starttls  ssl  authentication enabled   1 Open a new Java class in netbeans  default package of the project  and name it as  Mail java    2 Copy paste the entire code below and save it    3 Right click on the file name in the left side panel and click  compile  then click  Run   import javax mail    import javax mail internet    import java util     public class sendToEmail       String  d email    sample gmail com        d password    mysamplepassword        d host    smtp gmail com        d port     465          m to    sample yahoo com        m subject    trial        m text    Hey  this is the testing email         public sendToEmail String strEmailAddress                  Properties props   new Properties            props put  mail smtp user   d email           props put  mail smtp host   d host           props put  mail smtp port   d port           props put  mail smtp starttls enable   true            props put  mail smtp auth    true              props put  mail smtp debug    true            props put  mail smtp socketFactory port   d port           props put  mail smtp socketFactory class    javax net ssl SSLSocketFactory            props put  mail smtp socketFactory fallback    false             SecurityManager security   System getSecurityManager             try                       Authenticator auth   new SMTPAuthenticator                Session session   Session getInstance props  auth                 session setDebug true                MimeMessage msg   new MimeMessage session               msg setText m text               msg setSubject m subject               msg setFrom new InternetAddress d email                msg addRecipient Message RecipientType TO  new InternetAddress strEmailAddress                Transport send msg                     catch  Exception mex                        mex printStackTrace                          public class SMTPAuthenticator extends javax mail Authenticator               public PasswordAuthentication getPasswordAuthentication                         return new PasswordAuthentication d email  d password                       portion of my controller java     Send to Email will run properly soon                sendToEmail email   new sendToEmail strEmailAddress     When I run my web application I got this error message saying       Type Exception report      message       description The server encountered an   internal error    that prevented it   from fulfilling this request       exception    javax servlet ServletException    Servlet execution threw an exception      root cause    java lang NoClassDefFoundError    javax mail Authenticator     controller RegisterTenantController doPost RegisterTenantController java 108      javax servlet http HttpServlet service HttpServlet java 709      javax servlet http HttpServlet service HttpServlet java 802    What will I do now  Can somebody help me to get this web application successful

User · Answer

Even I was facing a similar error  Try below 2 steps  the first of which has been recommended here already  -   1  Add the dependencies to your pom xml            lt dependency gt               lt groupId gt javax mail lt  groupId gt               lt artifactId gt mail lt  artifactId gt               lt version gt 1 4 5 lt  version gt           lt  dependency gt            lt dependency gt               lt groupId gt javax activation lt  groupId gt               lt artifactId gt activation lt  artifactId gt               lt version gt 1 1 1 lt  version gt           lt  dependency gt     If that doesn t work  manually place the jar files in your  m2 repository javax  lt folder gt   lt version gt   directory

User · Answer

When I had this problem  I had included the mail-api jar in my maven pom file   That s the API specification only   The fix is to replace this    lt  -- DO NOT USE - it s just the API  not an implementation -- gt   lt groupId gt javax mail lt  groupId gt   lt artifactId gt javax mail-api lt  artifactId gt    with the reference implementation of that api    lt groupId gt com sun mail lt  groupId gt   lt artifactId gt javax mail lt  artifactId gt    I know it has sun in the package name  but that s the latest version   I learned this from https   stackoverflow com a 28935760 1128668

User · Answer

While it s possible that this is due to a jar file missing from your classpath  it may not be   It is important to keep two or three different exceptions strait in our head in this case    java lang ClassNotFoundException  This exception indicates that the class was not found on the classpath   This indicates that we were trying to load the class definition  and the class did not exist on the classpath  java lang NoClassDefFoundError  This exception indicates that the JVM looked in its internal class definition data structure for the definition of a class and did not find it   This is different than saying that it could not be loaded from the classpath   Usually this indicates that we previously attempted to load a class from the classpath  but it failed for some reason - now we re trying again  but we re not even going to try to load it  because we failed loading it earlier   The earlier failure could be a ClassNotFoundException or an ExceptionInInitializerError  indicating a failure in the static initialization block  or any number of other problems   The point is  a NoClassDefFoundError is not necessarily a classpath problem    I would look at the source for javax mail Authenticator  and see what it is doing in it s static initializer   Look at static variable initialization and the static block  if there is one    If you aren t getting a ClassNotFoundException prior to the NoClassDefFoundError  you re almost guaranteed that it s a static initialization problem   I have seen similar errors quite frequently when the hosts file incorrectly defines the localhost address  and the static initialization block relies on InetAddress getLocalHost    127 0 0 1 should point to  localhost   and probably also localhost localdomain   It should NOT point to the actual host name of the machine  although for some reason  many older RedHat Linux installers liked to set it incorrectly

User · Answer

You need to add two jars into the WEB-INF lib directory or your webapp  or lib directory of the server     mail jar - contains the actual smtp implmentation activation jar - needed by mail jar

User · Answer

I once ran into this situation and I had the dependencies in classpath  The solution was to include javax mail and javax activation libraries in the container s  eg  tomcat  lib folder  Using maven -set them to provided scope and it should work  You will have shared email libs in classpath for all projects   Useful source  http   haveacafe wordpress com 2008 09 26 113

User · Answer

Add following to your maven dependency       lt dependency gt           lt groupId gt javax mail lt  groupId gt           lt artifactId gt mail lt  artifactId gt           lt version gt 1 4 5 lt  version gt       lt  dependency gt        lt dependency gt           lt groupId gt javax activation lt  groupId gt           lt artifactId gt activation lt  artifactId gt           lt version gt 1 1 1 lt  version gt       lt  dependency gt

[java] java.lang.NoClassDefFoundError: javax/mail/Authenticator, whats wrong?

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