Javamail demo not working

Question

I have tried running the demo msgsend from JavaMail. I have downloaded version 1.4.5 of JavaMail and unpacked it into my JDK folder. I have added mail.jar to CLASSPATH. I have compiled msgsend.java without getting any error back. However, when I then try running java msgsend I get an "Could not find the main class: msgsend" error.

I am a total noob in Java world and have spend hours browsing through the Internet trying to find an answer but to no avail in my case.

Here is what I get in the console. What am I doing wrong?

C:\Program Files\Java\jdk1.6.0_34\javamail-1.4.5\demo>echo %CLASSPATH%
C:\Program Files\Java\jdk1.6.0_34\javamail-1.4.5\mail.jar

C:\Program Files\Java\jdk1.6.0_34\javamail-1.4.5\demo>javac -cp "%classpath%" ms
gsend.java

C:\Program Files\Java\jdk1.6.0_34\javamail-1.4.5\demo>java msgsend
Exception in thread "main" java.lang.NoClassDefFoundError: msgsend
Caused by: java.lang.ClassNotFoundException: msgsend
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: msgsend.  Program will exit.

C:\Program Files\Java\jdk1.6.0_34\javamail-1.4.5\demo>java -cp "%classpath%" msg
send
Exception in thread "main" java.lang.NoClassDefFoundError: msgsend
Caused by: java.lang.ClassNotFoundException: msgsend
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: msgsend.  Program will exit.

C:\Program Files\Java\jdk1.6.0_34\javamail-1.4.5\demo>

Answer 1

Classes are case sensitive. Be sure you have the compiled MsgSend in your class path, and invoke the compiled class with the proper case.

Try java MsgSend

Edited:

This is how it will work:

Compile as you were doing: javac.exe -cp ..\mail.jar msgsend.java And then to run the compiled class do: java -cp ..\mail.jar;. msgsend In other words: you were missing the current folder in your classpath.

Answer 2

You didn't include the directory where msgsend.class exists, usually the current directory ("."). See the examples in README.txt included with JavaMail.