Replace usage of SecurityManager and AccessController#doPrivileged #1638
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The SecurityManager class is deprecated for removal since JDK 17. Its getClassContext method is used to optain the calling class when Native#register and Native#unregister are used without the target class being passed in. With JDK 9 the StalkWalker was introduced to make that information available. This change makes both methods available using method handles and prefers the StalkWalker codepath as that is the path expected to be invoked in most cases (on JDK 9+). The AccessController#doProvileged call is replaced by a method handle, assuming, that in an environment where WebStart is available, AccessController is also available. Closes: java-native-access#1636
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The SecurityManager class is deprecated for removal since JDK 17. Its getClassContext method is used to optain the calling class when Native#register and Native#unregister are used without the target class being passed in. With JDK 9 the StalkWalker was introduced to make that information available. This change makes both methods available using method handles and prefers the StalkWalker codepath as that is the path expected to be invoked in most cases (on JDK 9+).
The AccessController#doProvileged call is replaced by a method handle, assuming, that in an environment where WebStart is available, AccessController is also available.
Closes: #1636