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Asked: 2026-05-31T22:35:41+00:00

How is object of serialized class created dynamically without calling the constructor when de-serialization

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How is object of serialized class created dynamically without calling the constructor when de-serialization in java?
What is the mechanism used by the JVM to create the object instance?

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1 Answer

  1. Editorial Team

    It depends on the JVM, but the Sun/Oracle/OpenJDK uses sun.misc.Unsafe.allocateInstance(Class)

       /** Allocate an instance but do not run any constructor.
       Initializes the class if it has not yet been. */
   public native Object allocateInstance(Class cls)
       throws InstantiationException;

    http://www.docjar.com/html/api/sun/misc/Unsafe.java.html

    This allows you to create new instances of just about anything e.g. enums, but not new instances of Class.

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