Hello!
This problem is not related to H2 at all.
H2 by itself can return TIMESTAMP WITH TIME ZONE and compatible values as
java.time.Instant from its JDBC driver if it is explicitly requested.
try (Connection c = DriverManager.getConnection("jdbc:h2:mem:")) {
ResultSet rs = c.createStatement().executeQuery("VALUES TIMESTAMP WITH TIME
ZONE '2023-01-02 03:04:05.123456789+00'");
rs.next();
System.out.println(rs.getObject(1, Instant.class));
}
But when you use some library on top of JDBC, you need to ensure that this
library also supports java.time.Instant values. This Java type is not a
part of JDBC specification and only few drivers (including driver of H2)
support it natively. Java persistence libraries also aren't required to
know this data type. It looks like you need to write an own data type
converter. For example, in JPA, converters implement
jakarta.persistence.AttributeConverter or
javax.persistence.AttributeConverter depending on version of JPA
implementation. In your case an implementation of
org.springframework.core.convert.converter.Converter seems to be required.
spring-data-commons project has
org.springframework.data.convert.Jsr310Converters class with some
converters for java.time.Instant type, but it doesn't have a converter
between java.time.OffsetDateTime (JDBC data type for TIMESTAMP WITH TIME
ZONE SQL data type) and java.time.Instant.
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