Rest Endpoint produces HttpMessageNotWritableException [DATAREST-1047]

Henri Sara opened DATAREST-1047 and commented

A simple project accessing a Spring Data repository through REST results in a ClassCastException from Jackson, which is using the wrong serializer (DoubleSerializer for a String) in BeanPropertyWriter.serializeAsField().

The symptoms resemble the old issues DATAREST-716 and DATAREST-743.

The linked GitHub project (branch spring-data-bug) produces the error when using 2.0.0.BUILD-SNAPSHOT as the sprint-boot-starter-parent version but not with 1.5.2.RELEASE when accessing the root of the REST endpoint ( http://localhost:8080/beverage/ ).

The output is

Could not write content: java.lang.String cannot be cast to java.lang.Double (through reference chain: org.springframework.hateoas.PagedResources["_embedded"]->java.util.Collections$UnmodifiableMap["beverages"]->java.util.ArrayList[0]->org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$PersistentEntityResourceSerializer$1["content"]->com.example.Beverage["beverageName"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: java.lang.String cannot be cast to java.lang.Double (through reference chain: org.springframework.hateoas.PagedResources["_embedded"]->java.util.Collections$UnmodifiableMap["beverages"]->java.util.ArrayList[0]->org.springframework.data.rest.webmvc.json.PersistentEntityJackson2Module$PersistentEntityResourceSerializer$1["content"]->com.example.Beverage["beverageName"])

Affects: 3.0 M2 (Kay)

Reference URL: https://github.com/hesara/cologne-jug/tree/spring-data-bug

2 votes, 3 watchers