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72 lines
2.7 KiB
72 lines
2.7 KiB
<?php require("header.inc"); ?>
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<h1>FAQ - Frequently Asked Questions</h1>
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This is a list of some questions that pop up from time to time.
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<h2>Decompiler issues</h2>
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<h3>The decompiler crashes with a VerifyException, what can I do?</h3>
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<p>The class isn't verifiable, probably because there is not enough
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information about used classes. See the question about the
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classpath.</p>
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<p>This could also be caused by malicious bytecode, or because there
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is a bug in Jode's verifier.</p>
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<h3>What should be included in the classpath?</h3>
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<p>Jode needs to know the full class hierarchie to guess the types.
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This includes not only the classes in the program, but also the
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libraries used by the java program, even the Java runtime library.
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You should set the classpath to include all these classes.</p>
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<p>If you don't specify the classpath on the command line, Jode uses
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the same as your Java Virtual Machine.</p>
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<p>As last resort, if Jode can't find a class in the classpath it uses
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reflection to ask the Virtual Machine. This works quite well, but
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loading classes can have side effects, e.g. when AWT classes are
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loaded, an AWT thread is created, even though Jode doesn't need
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it.</p>
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<h3>Why doesn't Jode decompile my inner class
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<code>MyClass$Inner.class</code>?</h3>
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<p>You should decompile the outermost class (<code>MyClass</code> in
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this case). The produced code contains the inner class. </p>
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<h2>Obfuscator issues</h2>
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<h3>What should be included in the classpath?</h3>
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<p>The program, all libraries, the Java runtime library. Don't omit a
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library even when you don't want to obfuscate it.</p>
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<h3>What should I preserve</h3>
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<p>The most common mistake is to preserve a class. In most cases this
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is not what you want. This only makes sure the class won't be
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renamed, it doesn't prevent it from being stripped. Instead you
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should preserve methods and constructors. The constructor is just a
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method with the special name <tt><init></tt>. </p>
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<p> Another common mistake is to omit the type
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signature, e.g. to preserve <tt>Class.main</tt> instead of
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<tt>Class.main.([Ljava/lang/String;)V</tt>. That doesn't work. If
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you don't want to care about the format of the type signature use a
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wildcard as in <tt>Class.main.*</tt>. </p>
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<h3>What is a type signature</h3>
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<p>The type signature is a machine readable representation of a java
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type that is used all over in java bytecode. The JDK ships a command
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named <tt>javap</tt>. With <tt>java -s</tt> you can lists the fields
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and methods of a class with their type signatures.</p>
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<p> If you are interested in the format of type signatures read the
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Java Virtual Machine Specification, Chapter 4.3 Descriptors</p>
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<?php require("footer.inc"); ?>
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