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Finding your java program - the CLASSPATH variable

When you run a Java 'program' (strictly, the main method of a class), it looks for that class in a file with the name given and with a .class extension in the places listed in the CLASSPATH environment variable. Failure to have the right CLASSPATH set results in a spectacular series of error messages!

[trainee@easterton ~]$ java Nother
Exception in thread "main" java.lang.NoClassDefFoundError: Nother
Caused by: java.lang.ClassNotFoundException: Nother
  at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
  at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:289)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
  at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
[trainee@easterton ~]$ export CLASSPATH=/home/trainee/a9tom
[trainee@easterton ~]$ java Nother
*** I love Trowbridge ***
*** I am a bit crazy ***
*** 1 => 2 ***
[trainee@easterton ~]$


Note:

CLASSPATH may include a series of : separated directories (; on windows)

CLASSPATH may contain the names of jar files, in which case the class will run straight from the jar
(written 2009-04-02)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
J601 - Java Introduction
  [2536] All the Cs ... and Java too - (2009-12-13)
  [2423] What is a JVM, a JRE, a JDK - components of the core Java Environment - (2009-09-26)
  [1908] Java CLASSPATH explained - (2008-11-26)
  [1766] Diagrams to show you how - Tomcat, Java, PHP - (2008-08-22)
  [1557] Trying out our Java examples on our web site - (2008-02-27)
  [1497] Training Season Starts again! - (2008-01-07)
  [1466] Effective Java training - the bootcamp approach - (2007-12-09)
  [1418] A Golf Club Decision - Perl to Java - (2007-11-01)
  [1158] Private Java Course - A customer's pictures - (2007-04-22)
  [1049] Java 6, Apache Tomcat 6. - (2007-01-21)
  [871] Java oversold? - (2006-09-19)
  [792] Is Java the right language to learn? - (2006-07-04)
  [317] Programming languages - a comparison - (2005-05-20)
  [124] PHP v Java - (2004-11-20)
  [111] Training notes available under Open Distribution license - (2004-11-07)
  [25] Release numbers - (2004-08-23)


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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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