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Constructor parameter mapping

Supported by ✅ Open Source Edition   ✅ Express Edition   ✅ Professional Edition   ✅ Enterprise Edition

When mapping records into immutable classes, the DefaultRecordMapper calls a constructor. If it cannot discover the constructor's parameter names, it has to match record values to constructor parameters by position. A set of settings governs where parameter names are looked up, so that values can be matched by name instead:

  • mapConstructorParameterNamesInKotlin (defaults to true): Whether to use the parameter names of a Kotlin class's primary constructor, which requires kotlin-reflect on the classpath. This has no effect on Java classes.
  • mapConstructorParameterNames (defaults to false): Whether to use parameter names obtained through Java reflection, using Executable.getParameters(). Parameter names are only available if the class was compiled with the javac -parameters flag.

Example configuration

Settings settings = new Settings()
    .withMapConstructorParameterNames(true); // Defaults to false

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