Initialy, I installed the j2sdk and try compiling and running program is ok. After installing other softwares into my computer, then it start to give me the below error message. The class file is 100 percent correct and just a simple "Hello World!" application. Can anybody figure it out for me? C:\j2sdk1.4.1_05\bin>javac Test.java C:\j2sdk1.4.1_05\bin>javaTest Exception in thread "main" java.lang.NoClassDefFoundError: Test
CLASSPATH = C:\JRun4\lib\jrun.jar PATH = C:\j2sdk1.4.1_05\bin jrun.jar I use to compile servlet, it is provided by JRun 4.0 Server. And I use j2sdk1.4.1 to compile java class file. Is it something wrong here?