Java Cannot "Could not find or load main class HW" after I change CLASSPATH

Question

Things worked yesterday , I dont know what I did to break them

I'm trying to compile servlets , connect to MySQL DBs etc . Problem is this.

I have a HW.java file which just prints Hello World , I compile it and run it , it works fine

Now say I need to use Servlet API methods in it So I do this

export CLASSPATH="/Users/User/tomcat.....servlet...api"

now when I try to run (compilation works perfectly ) after exporting CLASSPATH I get this

Could not find or load main class HW

Not only Servlet Programs , even a Hello World program doesnt run Unless I CLear CLASSPATH by using export CLASSPATH=

Things worked fine before dont know what I broke , Please help

Don't forget to add the current directory to classpath : "." — Arnaud, Jan 04 '16 at 08:31
By default, current directory is in the classpath, UNLESS you declare the classpath on your own, which overwrites the default classpath. — Arnaud, Jan 04 '16 at 08:36
http://stackoverflow.com/questions/3706689/java-class-files-in-current-directory — Arnaud, Jan 04 '16 at 08:37
I read that post but just export CLASSPATH="lib/somejar.jar:lib/someOtherJar.jar" lib/someOtherJar.jar and then running a .class file on the current dir worked yesterday :( how is that possible — Sainath S.R, Jan 04 '16 at 08:38

score 0 · Answer 1 · answered Jan 04 '16 at 20:43

You have to always remember to put class path with your class in the CLASSPATH as well.

export CLASSPATH="/Users/User/tomcat.....servlet...api":$CLASSPATH:/somedir/where/your/HW_class_is

And remember to put top dir where your package is declared. Let's say you have class

mypackage.mysubpackage.HW.class

inside dir

$HOME/test/mypackage/mysubpackage

you have to add:

$HOME/test/ to CLASSPATH

1 Answers1