java - Could not find main class:program will exist (Exception in main() thread NoClassDefFoundError) - 


import java.security.*; import java.math.*;  public class md5 {     public static void main(string args[]) throws exception{         string s="anand";         messagedigest m=messagedigest.getinstance("md5");         m.update(s.getbytes(),0,s.length());         system.out.println("md5: "+new biginteger(1,m.digest()).tostring(16));     } }

in code fine plus working before wen i'm running above code mentioned exception occurs... adding installed jdk few seconds ago.. done path java_home.. still exception.. help...!!!!!

java_home=c:\program files\java\jdk1.6.0_45\ java installed..

path=c:\program files\java\jdk1.6.0_45\bin;

classpath=%catalina_home%\lib\servlet-api.jar;c:\program files\java\jdk1.6.0_45\bin;

compiling command:

javac md5.java

running command:

java md5

you need tell java can find classes (or rather, roots of package trees). sinc eyour class in default package, , located in directory run java command, need

java -classpath . md5

or

java -cp . md5

you should never rely on global classpath environment variable. doing nightmare have 2 different java apps. , jdk bin folder has nothing in classpath.

note using default package bad practice, , should never put own files in directory java installed.


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