> ## `java.lang.ClassNotFoundException` thrown on `com.ms.*` package when applet runs

> ###
> Symptoms

> > When running an applet in a browser using the Sun JRE, a `ClassNotFoundException` is thrown by the `ClassLoader` on the `com.ms.*` package. The same applet runs under the Microsoft VM.

> ### Cause

> > The Microsoft VM provides many proprietary class libraries, including J/Direct, AFC, and WFC. These package are not available in the Sun JRE, so a `ClassNotFoundException` is thrown when the applet runs.

> ### Resolution

> > The workaround is to migrate the applet source code from using the Microsoft proprietary class libraries to similar classes in the Java 2 platform.

> Microsoft VM | Java 2 Platform
> J/Direct | Java Native Interface
> Application Foundation Classes | Swing, Java 2D APIs
> Windows Foundation Classes | Swing, Java 2D APIs

> ### Related Information

> > How to avoid potential pitfalls of Microsoft's non-standard SDK for Java
> > Lesson: User Interfaces that Swing: A Quick Start Guide
> > Trail: Creating a GUI with JFC/Swing
> > Trail: Java Native Interface