Fix NPE in DoubleAttributeConverter and FloatAttributeConverter for null input

[S-Saranya1]

DoubleAttributeConverter.transformFrom() and FloatAttributeConverter.transformFrom() throw a cryptic NullPointerException (no message) when called with a null input due to
auto-unboxing in ConverterUtils.validateDouble()/validateFloat(). This occurs when users persist a Map<String, Double> or List containing null values.

Motivation and Context

The AttributeConverter.transformFrom() interface contract states it should raise a RuntimeException if the input is null. The existing code does throw, but accidentally via auto-unboxing — producing a bare NPE with no useful message. This fix replaces the accidental NPE with an explicit Validate.paramNotNull check that throws
NullPointerException with a clear "input must not be null" message.

Modifications

• Added Validate.paramNotNull(input, "input") in ConverterUtils.validateDouble() and ConverterUtils.validateFloat()
• Added null input tests in NumberAttributeConvertersTest for both DoubleAttributeConverter and FloatAttributeConverter, verifying exception type and message

Testing

• Existing tests continue to pass
• New tests verify null input throws NullPointerException with message "input must not be null"

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed
• I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new file created by the script in .changes/next-release with your changes.
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

[sonarqubecloud]

Quality Gate failed

Failed conditions
63.6% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud