# Class IllegalClassFormatException

java.lang.Object
java.lang.Throwable
java.lang.Exception
java.lang.instrument.IllegalClassFormatException

All Implemented Interfaces:
  `Serializable`

public class IllegalClassFormatException extends Exception
Thrown by an implementation of `ClassFileTransformer.transform` when its input parameters are invalid. This may occur either because the initial class file bytes were invalid or a previously applied transform corrupted the bytes.

Since:
  1.5
See Also:
  - `ClassFileTransformer.transform(java.lang.ClassLoader, java.lang.String, java.lang.Class<?>, java.security.ProtectionDomain, byte[])`
  - Serialized Form

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `IllegalClassFormatException()`
  Constructs an `IllegalClassFormatException` with no detail message.
  `IllegalClassFormatException(String s)`
  Constructs an `IllegalClassFormatException` with the specified detail message.

- ## Method Summary

  ### Methods declared in class java.lang.Throwable

  `addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString`

  ### Methods declared in class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- ## Constructor Details

  - ### IllegalClassFormatException

    public IllegalClassFormatException()
    Constructs an `IllegalClassFormatException` with no detail message.

  - ### IllegalClassFormatException

    public IllegalClassFormatException(String s)
    Constructs an `IllegalClassFormatException` with the specified detail message.
    Parameters:
      `s` - the detail message.