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AccessControlException using custom ClassLoader with WebStart

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I have created a very basic database brower application. To provide the most fexibility, I allow users to enter the connection string and choose the *.jar file that contains the JDBC drivers for their database. Each JDBC driver is loaded using a custom ClassLoader that I created. The allows the user to connect to an Oracle, PostgreSql, MySQL, databases all at the same time and, by specifying the *.jar files themselves, I do not have to distribute dozens of jars with my application.
When I start the application via WebStart, the the signed jar files successfully all <AllPermission>. However, when my custom ClassLoader tries to read the jar file that a user specifies, I get an AccessControlException. Specifically, the exception is being thrown when my code hits the File.isDirectory() method (The custom ClassLoader I created can be given a directory and it will pickup every *.jar file in that directory).
Does anyone have any idea why my custom ClassLoader would not be able to access the jar file a user specifies? Do I have to register my custom ClassLoader with the SecurityManager in some way?
"The Hood"
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Moving to the Security forum.
We noticed he had no friends. So we gave him this tiny ad:
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