spring-data-jpa
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spring-projects
CrudMethodMetadataPostProcessor.java:153 throws a ClassCastException in a project with multiple Spring Data modules
I have a project that includes both Spring Data modules; spring-data-jpa and spring-data-couchbase.
When I try to save an entity using a JPA repository the following class:
https://github.com/spring-projects/spring-data-jpa/blob/2.6.x/src/main/java/org/springframework/data/jpa/repository/support/CrudMethodMetadataPostProcessor.java
throws a ClassCastException at line 153.
LOG INFORMATION: java.lang.ClassCastException: class org.springframework.data.couchbase.repository.support.CrudMethodMetadataPostProcessor$DefaultCrudMethodMetadata cannot be cast to class org.springframework.data.jpa.repository.support.CrudMethodMetadata (org.springframework.data.couchbase.repository.support.CrudMethodMetadataPostProcessor$DefaultCrudMethodMetadata and org.springframework.data.jpa.repository.support.CrudMethodMetadata are in unnamed module of loader org.apache.catalina.loader.ParallelWebappClassLoader @23aae55) at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:153) ~[spring-data-jpa-2.6.4.jar:2.6.4]
I noticed that the class DefaultCrudMethodMetadata lives in both Spring Data modules.
JPA (spring-data-jpa 2.6.4) https://github.com/spring-projects/spring-data-jpa/blob/2.6.x/src/main/java/org/springframework/data/jpa/repository/support/CrudMethodMetadataPostProcessor.java at line 190
COUCHBASE (spring-data-couchbase 4.3.4) https://github.com/spring-projects/spring-data-couchbase/blob/4.3.x/src/main/java/org/springframework/data/couchbase/repository/support/CrudMethodMetadataPostProcessor.java at line 185
It looks like the jpa data module is picking the wrong class to be casted when multiple Spring Data Modules exist in a project. The question is, why is the jpa module picking the Couchbase DefaultCrudMethodMetadata class for casting?
If you'd like us to spend some time investigating, please take the time to provide a complete minimal sample (something that we can unzip or git clone, build, and deploy) that reproduces the problem.
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Unfortunately, I cannot share the project for security purposes and I couldn't duplicate the issue in a minimal sample neither.
However, I noticed that "downgrading" or changing the version of the spring-data-couchbase jar from "4.3.4" to "4.2.11" solved the problem.
In the newer version, something is making the TransactionSynchronizationManager to bind a CrudRepository.save method to a Couchbase resource "org.springframework.data.couchbase.repository.support.CrudMethodMetadataPostProcessor$DefaultCrudMethodMetadata"
My repository extends the JpaRepository component and the associated entity class has the @Entity annotation (javax.persistance.Entity).
I'm not sure why is picking a Couchbase resource instead when I try to save the entity in the database.
I was able to duplicate the issue. Please find the minimal sample project at this link
It uses an in-memory database for the JPA repository.
The only configuration needed is a Couchbase server for the Couchbase repository.
This project creates a war file that can be deployed in a tomcat server and starts listening for requests at the /demo/entries endpoint.
Once this endpoint is hit, it produces the issue. The main code that duplicates the problem can be found at the DemoController.java class.