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JVMS section 4.4.6 states as follows: ---Excerpt-from-spec--- CONSTANT_NameAndType_info { u1 tag; u2 name_index; u2 descriptor_index; } ... The items of the CONSTANT_NameAndType_info structure are as follows: ... descriptor_index The value of the descriptor_index item must be a valid index into the constant_pool table. The constant_pool entry at that index must be a CONSTANT_Utf8_info (4.4.7) structure representing a *valid* field descriptor (4.3.2) or method descriptor (4.3.3). ---End-of-excerpt--- However, JVM class format checker does not reject classes with invalid (according to Section 4.3.3) method descriptors at the descriptor_index in the CONSTANT_NameAndType_info structure (like "(#)V", "(.)V", "(;)V", "()V#" or similar) if there are *NO any explicit or implicit references* to this NameAndType from a class methods bytecodes.
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