NullPointerException for embbedded objects

[sergey-morenets]

Hi

We have the following Java record:

public record Point (int x, int y) {

	public static Point valueOf(String text) {
		return null;
	}
}

And most often store it using converter:

@WritingConverter
public class PointToStringConveter implements
	Converter<Point, String>{
	
	@Override
	public String convert(Point point) {
		return point.toString();
	}
}

However for one entity we would like to store it as embedded object:

	@Embedded(onEmpty = OnEmpty.USE_NULL)
	private Point location;

Unfortunately in this case we receive the following exception while saving it:

Caused by: java.lang.NullPointerException: Cannot invoke "org.springframework.data.relational.core.mapping.RelationalPersistentEntity.getPropertyAccessor(Object)" because "persistentEntity" is null
	at org.springframework.data.jdbc.core.convert.SqlParametersFactory.getParameterSource(SqlParametersFactory.java:244)
	at org.springframework.data.jdbc.core.convert.SqlParametersFactory.lambda$getParameterSource$2(SqlParametersFactory.java:260)
	at org.springframework.data.mapping.model.BasicPersistentEntity.doWithProperties(BasicPersistentEntity.java:298)
	at org.springframework.data.mapping.PersistentEntity.doWithAll(PersistentEntity.java:297)
	at org.springframework.data.jdbc.core.convert.SqlParametersFactory.getParameterSource(SqlParametersFactory.java:247)
	at org.springframework.data.jdbc.core.convert.SqlParametersFactory.forInsert(SqlParametersFactory.java:83)
	at org.springframework.data.jdbc.core.convert.DefaultDataAccessStrategy.insert(DefaultDataAccessStrategy.java:104)
	at org.springframework.data.jdbc.core.JdbcAggregateChangeExecutionContext.executeInsertRoot(JdbcAggregateChangeExecutionContext.java:83)
	at org.springframework.data.jdbc.core.AggregateChangeExecutor.execute(AggregateChangeExecutor.java:85)

Spring Data JDBC: 3.1.0

[schauder]

You can either handle a class as an entity which might be embedded or as a type mapped to a single column, which you do by using a converter.

You can't mix the two.

As a workaround you could create separate subclasses to use in the two different settings.

[sergey-morenets]

Hi @schauder

Can you please mention in the documentation that entity used in the converter can't be applied as embedded?
Because the raised exception is confusing and doesn't explain the cause of this issue.