Could not find or load main class

Question

I have Windows 7, installed jdk1.7.0 and its supporting jre7.
My problem is compilation part works perfectly, but while running the Java program I get this error saying:

Answer 1

You might have the CLASSPATH environment variable already added!!

Use following to avoid further usage of -cp . in java -cp . CLASSFILE

Add . to CLASSPATH in system properties->environment variables or by cmd

set CLASSPATH=%CLASSPATH%;.;

Answer 2

If you have a single .java file to compile using command-line , then remove topmost package parts from the code, the compile again, it will work.

This worked for me.

Answer 3

Check you class name first. It should be p1 as per your batch file instruction. And then check you package of that class, if it is inside any package, specify when you run.

If package is x.y

java x.y.p1

Answer 4

i guess that you have a different class name in p1.java