This example shows the ability of Java to declaratively restrict access to certain packages when run with SecurityManager. By default, access to classes in "sun.*" packages is restricted. However, since Java runs without SecurityManager by default, these checks may not be always performed. An explanation of example: 1. RestrictedPackageAccess class creates and calls sun.misc.BASE64Encoder 2. First, the default execution happens without SecurityManager, and everything is permitted 3. Secondly, SecurityManager is enabled, and the code doesn t pass the security check 4. However, when the code is run with a different policy, that allows access, the excution goes fine again.

access.policy
execute.bat
Java.III.PackageChecks.txt
RestrictedPackageAccess.java

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