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Editorial Team
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Asked: 2026-06-04T10:31:21+00:00

Can I pass some properties to an EntityManagerFactory by code, while still maintaining persistence.xml

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Can I pass some properties to an EntityManagerFactory by code, while still maintaining persistence.xml as the main configuration source? Using createEntityManager‘s overload with a Map appears to override persistence.xml completely:

Map<String, String> propertyMap;
factory.createEntityManager(propertyMap);

I’d like to configure JPA in persistence.xml, but pass in a custom connection string. I’m using HSQL and I’d like to compose a custom DB-file path with the current user directory, which I have to get by code (as far as I know).

It would be great if I could keep persistence.xml anyway, as I’d not have to write a custom configuration mechanism.

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1 Answer

  1. Editorial Team

    You mean

    Persistence.createEntityManagerFactory(puName, props);

    unless of course you mean you have created the EMF first and want to apply props after that?

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