Rafael Winterhalter • 4/8/2018

JDK 11 and proxies in a world past sun.misc.Unsafe

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This technical article discusses the deprecation and removal of the sun.misc.Unsafe.defineClass method in JDK 11, a change impacting code generation frameworks. It details the security risks of the old method and introduces the replacement API using MethodHandles.Lookup, which enforces module and package boundaries via the Java Platform Module System (JPMS). The post includes code examples and explains the implications for libraries like Byte Buddy.

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#Bytecode #Class Loading #Unsafe
JDK 11 and proxies in a world past sun.misc.Unsafe

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