Java newbie (1 year). Im trying to write a chat app in java..
Im using JPQL and PostgreSQL. Im having problems with the mapping, it worked okay before, but after i used copilot on it, it broke... Could anyone help me please?
code: https://github.com/h679172/chatapp.git
Thank you
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GitHub - h679172/chatapp: Chat application
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i get this error when i try Sender
Exception in thread "main" Local Exception Stack:
Exception [EclipseLink-30005] (Eclipse Persistence Services - 4.0.2.v202306130914): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: jdk.internal.loader.ClassLoaders$AppClassLoader@70dea4e
Internal Exception: jakarta.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 4.0.2.v202306130914): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [WestsecPU] failed.
now its this
Exception [EclipseLink-48] (Eclipse Persistence Services - 4.0.2.v202306130914): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: Multiple writable mappings exist for the field [westsec_chat.users.user_id]. Only one may be defined as writable, all others must be specified read-only.
Mapping: org.eclipse.persistence.mappings.ManyToOneMapping[recipient]
Descriptor: RelationalDescriptor(no.westsec.chat.Recipient --> [DatabaseTable(westsec_chat.users)])
i fixed it, thank you for the help
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