Java™ How To Program (Early Objects), Tenth Edition

Setting the CLASSPATH Environment Variable

If you attempt to run a Java program and receive a message like

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Exception in thread "main" java.lang.NoClassDefFoundError: YourClass

then your system has a CLASSPATH environment variable that must be modified. To fix the preceding error, follow the steps in setting the PATH environment variable, to locate the CLASSPATH variable, then edit the variable’s value to include the local directory—typically represented as a dot (.). On Windows add

.;

at the beginning of the CLASSPATH’s value (with no spaces before or after these characters). On other platforms, replace the semicolon with the appropriate path separator characters—typically a colon (:).