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<p style="margin: 10px 0 0 0">By Spring integration, I mean that I use spring-orm and spring-data-jpa in the app to create the EMFactory, handle declarative transactions, discover entities by classpath scanning, etc., and it worked fine. I wouldn't have been surprised, given the major version change, if Spring had a problem with the new version. It appeared that it didn't have any. That was not possible when switching from hibernate 3 to hibernate 4, and Spring had to rewrite many classes for hibernate 4 support. </p>
<p style="margin: 10px 0 0 0">I indeed let Hibernate set everything up. I just changed the hibernate version number in my gradle dependencies, added the hibernate-java8 dependency, removed the jadira dependency, and everything went fine. A typical mapped Instant field looks like this:</p>
<p style="margin: 10px 0 0 0">{{ /**</p>
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The registration date of the user<br /> */<br /> private Instant registrationDate;}}
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<p style="margin: 10px 0 0 0">Regarding the last question, it's a tough one. I made that choice based on <span class="error">[this SO answer]</span>(<a href="http://stackoverflow.com/a/22925669/571407" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">http://stackoverflow.com/a/22925669/571407</a>) and the [linked blog post|http://justatheory.com/computers/databases/postgresql/use-timestamptz.html). <br /> Given that JDBC uses the default timezone by default when setting a timestamp (unless you use the [method with an additional Calendar argument|https://docs.oracle.com/javase/8/docs/api/java/sql/PreparedStatement.html#setTimestamp-int-java.sql.Timestamp-java.util.Calendar-), using a timestamptz is much safer, because it <b>pays attention</b> to the timezone, meaning that no conversion needs to be done at all, and no Calendar needs to be passed to have the correct value stored in UTC.</p>
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