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> ## `java.security.AccessControlException` Thrown In the Execution of `java.beans.Introspector.setBeanInfoSearchPath()` Method

> ###
> Symptoms

> > When running an applet in a browser by using the Sun JavaTM Runtime Environment (JRETM) implementation, a `java.security.AccessControlException` is thrown in the execution of the `java.beans.Introspector.setBeanInfoSearchPath() method` as shown below:

> > > `java.security.AccessControlException: access denied (java.util.PropertyPermission * read,write)
> > > at java.security.AccessControlContext.checkPermission(Unknown Source)
> > > at java.security.AccessController.checkPermission(Unknown Source)
> > > at java.lang.SecurityManager.checkPermission(Unknown Source)
> > > at java.lang.SecurityManager.checkPropertiesAccess(Unknown Source)
> > > at java.beans.Introspector.setBeanInfoSearchPath(Unknown Source)
> > > at ....`

> > The same applet runs without any error with the Microsoft Virtual Machine (VM).

> ### Cause

> > The `Introspector.setBeanInfoSearchPath()` method call can change the list of package names used for finding `BeanInfo` classes. If more than one applet is running in the VM, an untrusted applet could call this method to redirect other applets to look up `BeanInfo` in unexpected packages. This is a flaw in security.

> > A security check for `java.util.PropertyPermission` is added to Introspector.setBeanInfoSearchPath() method in the JRE to address the security concern. If the applet is unsigned and it calls this method, a `java.security.AccessControlException` is thrown.

> ### Resolution

> > To fix the above causes:

> > - Sign the applet by using the Java Development Kit (JDK) `jarsigner` tool, so that the applet runs as a trusted applet and has permissions to call the `Introspector.setBeanInfoSearchPath()` method.
> > - Rearchitect the applet code to avoid the call to `Introspector.setBeanInfoSearchPath()`. For example, instead of relying on the `BeanInfo` class search path, use a fully qualified package name for searching the `BeanInfo`.

> ### Related Information

> See jarsigner, which is the JAR Signing and Verification Tool.

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