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Asked: 2026-05-14T20:21:46+00:00

Why does JPA require a no-arg constructor for domain objects? I am using eclipselink

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Why does JPA require a no-arg constructor for domain objects?
I am using eclipselink and just got this exception during deployment.

Exception [EclipseLink-63] (Eclipse Persistence Services-1.1.0.r3639-SNAPSHOT): 
org.eclipse.persistence.exceptions.DescriptorException

Exception Description: The instance creation method   
[com.me.model.UserVO.<Default Constructor>], with no parameters, 
  does not exist, or is not accessible.
Internal Exception: java.lang.NoSuchMethodException: 
  com.me.model.UserVO.<init>()
Descriptor: RelationalDescriptor(com.me.model.UserVO --> 
  [DatabaseTable(user)])
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1 Answer

  1. Editorial Team

    Because it often happens that the JPA provider has to instantiate your domain object dynamically. It cannot do so, unless there is a no-arg constructor – it can’t guess what the arguments should be.

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