java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.springframework.data.rest.webmvc.RepositoryEntityController.getSingleEntity(RepositoryEntityController.java:226)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

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