Linux under Error:could not find or Load main class Hello

Under Linux wrote a very easy Hello world program, compile execution unexpectedly error: Error:could not find or Load main class Hello

The last discovery is the classpath problem.

The first thing to check is whether the JDK environment variable is configured correctly: see this article: ubuntu12.04 installation configuration jdk1.7

Mainly in the environment variables this block:

Export Java_home=/usr/java/jdk1.8.0export jre_home=${java_home}/jre  export CLASSPATH=.:${JAVA_HOME}/LIB:${JRE _home}/lib  

My environment variable was misconfigured before, so after the change, Source/etc/profile again loaded this file, OK, now will not error!

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Linux under Error:could not find or Load main class Hello