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I am currently trying to specify a delete method in my ReactiveCrudRepository. There ar predefined delete methods which work as expected. But my primary key is named msisdn and not id so i need to define a custom method to delete entries by this key.

This is my approach. notice the Mono return type. it is the same as used by the ReactiveCrudRepository from spring

public interface RegistrationRepository extends ReactiveCrudRepository<RegistrationEntity, String> 

 Mono<RegistrationEntity> findByMsisdn(String msisdn);

 Mono<Void> deleteByMsisdn(String msisdn);

I wrote a simple test where test data is persistet in a inmemory cassandra instance and afterwards i try to delete the entry. But i get following exception:

org.springframework.data.mapping.MappingException: Couldn't find PersistentEntity for type class java.lang.Void!

 at org.springframework.data.mapping.context.MappingContext.getRequiredPersistentEntity(MappingContext.java:79)
 at org.springframework.data.cassandra.repository.query.DtoInstantiatingConverter.<init>(DtoInstantiatingConverter.java:64)
 at org.springframework.data.cassandra.repository.query.ReactiveCassandraQueryExecution$ResultProcessingConverter.convert(ReactiveCassandraQueryExecution.java:229)
 at org.springframework.data.cassandra.repository.query.ReactiveCassandraQueryExecution$ResultProcessingExecution.execute(ReactiveCassandraQueryExecution.java:196)
 at org.springframework.data.cassandra.repository.query.AbstractReactiveCassandraQuery.executeNow(AbstractReactiveCassandraQuery.java:110)
 at org.springframework.data.cassandra.repository.query.AbstractReactiveCassandraQuery.execute(AbstractReactiveCassandraQuery.java:82)
 at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:605)
 at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.lambda$invoke$3(RepositoryFactorySupport.java:595)
 at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:595)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
 at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:59)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
 at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
 at org.springframework.data.repository.core.support.SurroundingTransactionDetectorMethodInterceptor.invoke(SurroundingTransactionDetectorMethodInterceptor.java:61)
 at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
 at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
 at com.sun.proxy.$Proxy45.deleteByMsisdn(Unknown Source)
 at ch.sbb.kat.fc.service.CassandraRepositoryTest.deleteTest(CassandraRepositoryTest.java:39)
 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:498)
 at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
 at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
 at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
 at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

Replacing the returntype with Mono does not work. It just returns the object without deleting it.

Am I missing something?

My solution is to use a MapId instead of String
:

public interface RegistrationRepository extends ReactiveCrudRepository<RegistrationEntity, MapId>