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> ## `java.lang.ClassNotFoundException` Thrown by `ClassLoader`

> ###
> Symptoms

> > When running an applet in a browser by using the Sun JavaTM Runtime Environment (JRETM) implementation, a `java.lang.ClassNotFoundException` is thrown by the `ClassLoader`. The same applet runs without any error under the Microsoft Virtual Machine (VM).

> ### Cause

> > This error is caused by applets being packaged as `.cab` files. The `.cab` file is an archive format specific to Microsoft Windows and it is not supported by the Sun JRE.

> ### Resolution

> > Extract the applet classes and resources from the `.cab` files and repackage them as `.jar` files using the `Java Archive File Format (JARTM)` tool from Java Development Kit (JDK). Type the following command to repackage files as .jar files:

> > `jar cvf <jar_file> <input_files>`

> > Modify the `<APPLET>` tag in the HTML page to specify the `.jar` files in the `archive` attribute. For example, assume you have the following code:

> > `<APPLET code="MyApplet" width=100 height=100>
> > <PARAM name="cabbase" value="package1.cab, package2.cab">
> > </APPLET>`

> You can modify the above code as shown in the following example:

> > > <`APPLET code="MyApplet" archive="package1.jar, package2.jar" width=100 height=100>
> > > </APPLET>`

> ### Related Information

> See the JAR tool documentation for more details.

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