I Just Found Java Compiler Bug

Filed under: — By Aviran Mordo @ 9:18 am

I just found a bug in Java compiler (java version “1.6.0_24″), where the compiler allows to return null in a method signature that return int.

Here is an example of the code that should not compile.

public int foo()
return true ? null : 0;

Of course the “true” can be replaced with any boolean expression.

The java compiler compiles this code without problem, however at runtime you’ll get NullPointerException.


2 Responses to “I Just Found Java Compiler Bug”

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  2. Lattie Says:

    The behavior is correct since it is legal to return an Integer object when an ‘int’ is expected.

    null references the ‘NULL’ integer object.

    That all being said: Don’t write code like that! ;)

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