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  Tutorial: An introduction to J2EE security

A Java program runs within a JVM, and the JVM itself runs as a normal process on the host machine. As a user process, the JVM enjoys all the rights and privileges associated with the user on resources such as files, devices, ports, memory, CPU, disk space

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The Java security model works within the confines of this boundary drawn by the OS.
The fact that the same Java program must be able to run on multiple operating systems requires that they cannot rely on the security model and associated APIs of any one operating system. Java addresses this issue by defining APIs with pluggable providers. For example, Microsoft Windows has its own way of managing users, assigning access rights, and making this service available to Windows programs. Correspondingly, Java platform defines JAAS (Java Authentication and Authorization Service) to let a Java program avail itself of similar functionality. A Java program running on Windows can tap the Windows user management implementation as the provider for JAAS functionality. The same program running on a Unix platform would make use of a Unix user management sub-system.


 

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