When have field with type LocalDateTime in Projection, get Projection type must be an interface! [DATACMNS-1847]

Aiksandr opened DATACMNS-1847 and commented

In Spring boot 2.4.1 & 2.4.0 When use projection with field typed LocalDateTime example public interface Report { UUID getId(); LocalDateTime getCreateDate(); } after fetch it from DB, get exception when try access to LocalDateTime field getCreateDate()

i made sample project, if You run it like usual Spring app, that will throw this exception https://github.com/Aiksandr/spring-jpa-demo

{{Caused by: java.lang.IllegalArgumentException: Projection type must be an interface! at org.springframework.util.Assert.isTrue(Assert.java:121) at org.springframework.data.projection.ProxyProjectionFactory.createProjection(ProxyProjectionFactory.java:105) at org.springframework.data.projection.SpelAwareProxyProjectionFactory.createProjection(SpelAwareProxyProjectionFactory.java:45) at org.springframework.data.projection.ProjectingMethodInterceptor.getProjection(ProjectingMethodInterceptor.java:160) at org.springframework.data.projection.ProjectingMethodInterceptor.potentiallyConvertResult(ProjectingMethodInterceptor.java:108) at org.springframework.data.projection.ProjectingMethodInterceptor.invoke(ProjectingMethodInterceptor.java:85) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)}}

And in previews versions it works ok

This issue already was reproduced in spring boot issue https://github.com/spring-projects/spring-boot/issues/24528)

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Reference URL: https://github.com/spring-projects/spring-boot/issues/24528

Issue Links:

• DATACMNS-1836 Native projection stopped working with Java8 datetime (“duplicates”)

0 votes, 6 watchers

[mp911de]

Feel free to file a ticket directly against Spring Data JPA along with a minimal reproducible sample so we can specifically look into that issue. JPA typically returns the appropriate result and with a sample we can trace down the cause.

[schauder]

@NicklasWallgren please open a new issue, since this on e is closed.