NullPointerException in org.springframework.data.rest.core.UriToEntityConverter.<init>(UriToEntityConverter.java:68) [DATAREST-779]

Robert Gründler opened DATAREST-779 and commented

We're trying to expose JaxB-Generated Java classes as JSON via Rest. During context initialization, we see the following NPE:

Caused by: java.lang.NullPointerException: null
	at org.springframework.data.rest.core.UriToEntityConverter.<init>(UriToEntityConverter.java:68)
	at org.springframework.data.rest.webmvc.config.RepositoryRestMvcConfiguration.uriToEntityConverter(RepositoryRestMvcConfiguration.java:593)
	at org.springframework.data.rest.webmvc.config.RepositoryRestMvcConfiguration.defaultConversionService(RepositoryRestMvcConfiguration.java:209)
	at org.springframework.boot.autoconfigure.data.rest.SpringBootRepositoryRestMvcConfiguration$$EnhancerBySpringCGLIB$$272a1c6d.CGLIB$defaultConversionService$5(<generated>)
	at org.springframework.boot.autoconfigure.data.rest.SpringBootRepositoryRestMvcConfiguration$$EnhancerBySpringCGLIB$$272a1c6d$$FastClassBySpringCGLIB$$50104072.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:355)
	at org.springframework.boot.autoconfigure.data.rest.SpringBootRepositoryRestMvcConfiguration$$EnhancerBySpringCGLIB$$272a1c6d.defaultConversionService(<generated>)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162)

This happens because there is no null check in the UriToEntityConverter: https://github.com/spring-projects/spring-data-rest/blob/master/spring-data-rest-core/src/main/java/org/springframework/data/rest/core/UriToEntityConverter.java#L71

Affects: 2.4.2 (Gosling SR2)