23.24. Internal properties

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The following configuration properties are used internally, and you shouldn&#8217;t probably have to configured them in your application.

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Property
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Example
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Purpose
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`hibernate.enable_specj_proprietary_syntax`
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`true` or `false` (default value)
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Enable or disable the SpecJ proprietary mapping syntax which differs from JPA specification. Used during performance testing only.
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`hibernate.temp.use_jdbc_metadata_defaults`
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`true` (default value) or `false`
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This setting is used to control whether we should consult the JDBC metadata to determine certain Settings default values when the database may not be available (mainly in tools usage).
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`hibernate.connection_provider.injection_data`
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`java.util.Map`
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Connection provider settings to be injected in the currently configured connection provider.
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`hibernate.jandex_index`
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`org.jboss.jandex.Index`
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Names a Jandex `org.jboss.jandex.Index` instance to use.
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