Two common problems with Java execution (unable to load main class)

Problem 1:javac not internal or external commands

Issue 2: The main class cannot be found or cannot be loaded * * *

Both of these issues are related to the configuration of the JDK, one is the path and the other is classpath. Path: Where to find the tools to compile or run (must be set), Classpath: Where to find the class file that needs to be run (Java5 start not set). Pat configuration Error, problem 1,classpath configuration error two. When configured point in time "." Represents the current path, and if CLASSPATH is configured, the current path is first found, and if so, the configured path is first found. When both of these problems occur, check to see if your path and CLASSPATH are configured correctly.

Two common problems with Java execution (unable to load main class)