Duplicate :
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If there are no public or protected class found by javadoc, it reports this as an error but returns 0. Foo.java: class Foo { } javadoc Foo.java Loading source file Foo.java... Constructing Javadoc information... javadoc: error - No public or protected classes found to document. return value is 0, does not match the fact that an error was reported. Maybe this should be a warning, or it should return non-zero.