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Editorial Team
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Asked: 2026-05-24T13:31:00+00:00

I am trying to run a java program on my AIX server. I wrote

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I am trying to run a java program on my AIX server. I wrote the classpath 

/usr/java6/bin/javac  -classpath :.:/usr/jdk/commons-net-3.0.1.jar:/usr/jdk/classes12.jar:/usr/jdk/mysql-connector-java-5.1.17-bin.jar:/usr/jdk/jtds-1.2.5.jar:/urs/jdk/mail.jar:/usr/jdk/joda-time-1.6.2.jar:/usr/jdk/commons-codec-1.4.jar:/usr/jdk/commons-logging-1.1.1.jar:/usr/jdk/httpclient-4.1.1.jar:/usr/jdk/httpclient-cache-4.1.1.jar:/usr/jdk/httpcore-4.1.jar:/usr/jdk/httpmime-4.1.1.jar:/usr/jdk/mailapi.jar:/usr/jdk/pop3.jar:/usr/jdk/smtp.jar:/usr/jdk/dsn.jar:/usr/jdk/imap.jar -d . *.java

which seems to compile correctly. Then when I run the program

java daily_transmission

i get the error java.lang.NoClassDefFoundError: javax.mail.Address. All the .jar files that were in Eclipse when it worked before are in the /usr/jdk file.

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1 Answer

  1. Editorial Team

    A NoClassDefFoundError means that (quoting the relevant JavaDoc):

    Thrown if the Java Virtual Machine or a ClassLoader instance tries to
    load in the definition of a class (as part of a normal method call or
    as part of creating a new instance using the new expression) and no
    definition of the class could be found.

    The searched-for class definition existed when the currently executing
    class was compiled, but the definition can no longer be found.

    Two things to check:

    1. Firstly, you appear to have have a typo in your classpath (though it can’t have been there when you compiled the code, or it wouldn’t have compiled successfully, so that’s clearly not the root cause of the exception you’re seeing.): 

      /urs/jdk/mail.jar

      should be 

      /usr/jdk/mail.jar

    2. Make sure that you are also using the -classpath option to pass the classpath to java as well as to javac to pick up those .jar files at runtime: 

      java -classpath :.:/usr/jdk/commons-net-3.0.1.jar:/usr/jdk/classes12.jar:/usr/jdk/mysql-connector-java-5.1.17-bin.jar:/usr/jdk/jtds-1.2.5.jar:/urs/jdk/mail.jar:/usr/jdk/joda-time-1.6.2.jar:/usr/jdk/commons-codec-1.4.jar:/usr/jdk/commons-logging-1.1.1.jar:/usr/jdk/httpclient-4.1.1.jar:/usr/jdk/httpclient-cache-4.1.1.jar:/usr/jdk/httpcore-4.1.jar:/usr/jdk/httpmime-4.1.1.jar:/usr/jdk/mailapi.jar:/usr/jdk/pop3.jar:/usr/jdk/smtp.jar:/usr/jdk/dsn.jar:/usr/jdk/imap.jar daily_transmission
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