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Asked: 2026-06-01T05:50:46+00:00

I created a Java program which sends an email from my gmail account. I

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I created a Java program which sends an email from my gmail account. I programmed it in Eclipse and it works fine. But when I attempt to call it from PHP i get the following error:

Exception in thread "main" java.lang.NoClassDefFoundError: javax/mail/Address
  at sendVerificationEmail.main(sendVerificationEmail.java:3)
Caused by: java.lang.ClassNotFoundException: javax.mail.Address
  at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
  at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:266)

Here’s the command Eclipse uses:

/usr/lib/jvm/java-6-openjdk/bin/java -agentlib:jdwp=transport=dt_socket,suspend=y,address=localhost:53094 -Dfile.encoding=UTF-8 -classpath /home/****/dir/to/program/java/bin:/home/****/dir/to/program/java/lib/javamail-1.4.4/mail.jar sendEmail

Here’s the command PHP uses:

exec("java -classpath /home/****/dir/to/program/java/bin:/home/****/dir/to/program/java/lib/javamail-1.4.4/mail.jar sendVerificationEmail $name $email $comments");
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1 Answer

  1. Editorial Team

    You need to add the jar file containing the javax.mail… classes to your command:

    For example the following will add the current directory (.) and javax.jar to the classpath: 

    (linux)   java -classpath .:javax.jar com.me.MyMailClient
(windows) java -classpath .;javax.jar com.me.MyMailClient

    javax.jar is not what it will be called, that’s just to show you where you’d put it. To find out where Eclipse is getting the javax.mail.* items, look at your Project->Properties->Build Path->Libraries tab. One of the jars listed there is what you need (you can see the contents of jars by unzipping). It might be called mail.jar, j2ee.jar, javamail.jar – there are a few different likely candidates. Since your test app is simple it should have few dependencies so you’ll be able to spot it easily.

    You will need to put a copy of this jar file near run script (the above example assumes it is in the same directory as you are running the java command).

    Hope that helps.

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