Instances of this class are thrown by BCEL's class file verifier "JustIce" when a class file to verify does not pass the verification pass 3 because of a violation of a static constraint as described in the Java Virtual Machine Specification, Second edition, 4.8.1, pages 133-137. The static constraints checking part of pass 3 is called pass 3a in JustIce. Static constraints on the operands of instructions in the code array are checked late in pass 3a and are described on page 134-137 in the Java Virtual Machine Specification, Second Edition.