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Why do I get a ClassCastException when I try to obfuscate bytecode compiled with Java 5 (i.e. JDK 1.5)?

April 26, 2017bytecode ClassCastException compiled Java JDK obfuscate Try

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Why do I get a ClassCastException when I try to obfuscate bytecode compiled with Java 5 (i.e. JDK 1.5)?

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A ClassCastException can occur if you obfuscate bytecode compiled with the JDK 1.5 or better with Zelix KlassMaster 4.2 or earlier. It is due to the fact that the JDK 1.5 changed the JVM specification for the loading of constants in a fundamental way. Zelix KlassMaster (version 4.3 and better) has been enhanced to support bytecode created with the JDK 1.5.