Can 't get Java class run!Help I 'ma newbie in JAVA Below is the source file named 'HelloJava.java' It passed compiling, however it can 't be run by command' java HelloJava ' And error message 'Exception in thread "main" java.lang.NoClassDefFoundError : HelloJava' was printed! What on earth is the problem??Does it have any connection with the 'jre'? I install j2sdk1.4.2_02 from a rpm package, and my system is' RedHat 8.0 '. 13X PS. I add some new lines in /etc/profile JAVA_HOME=/usr/java/j2sdk1.4.1_01 CLASSPATH=. : $JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/jre/lib PATH=$JAVA_HOME/bin:$PATH Export PATH JAVA_HOME CLASSPATH Import java.util.*; Import java.lang.*; (Public static class HelloJava Public void main (String args []) { System.out.println ( "The time now is :"); System.out.println (new Date ()); } } Can 't get Java class run!Help Import java.util.*; Import java.lang.*. "=can Be deleted, upload default by the compiler Public class HelloJava -- Public static void main (String args []) { System.out.println ( "The time now is :"); System.out.println (new Date ()); } } [ Closed window ]