Clone the reproducer for HSEARCH-4107: git clone https: //github.com/knoobie/spring-2-4-entitymanager.git Change the versions of the spring-boot-starter-parent to the needed one (springboot 2.5.9 - spring framework 5.3.15 in this case). And the hibernate.search.version for the one used by EAP 5.10.7.Final-redhat-00001 . diff --git a/pom.xml b/pom.xml index 091ad45..be73f63 100644 --- a/pom.xml +++ b/pom.xml @@ -5,7 +5,7 @@ <parent> <groupId> org.springframework.boot </groupId> <artifactId> spring-boot-starter-parent </artifactId> - <version> 2.4.0 </version> + <version> 2.5.9 </version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId> com.example </groupId> @@ -16,7 +16,7 @@ <properties> <java.version> 1.8 </java.version> - <hibernate.search.version> 5.11.5.Final </hibernate.search.version> + <hibernate.search.version> 5.10.7.Final-redhat-00001 </hibernate.search.version> </properties> <dependencies> And test it: mvn clean test ... [INFO] [INFO] Results: [INFO] [ERROR] Errors: [ERROR] DemoApplicationTests.contextLoads:20 » ClassCast class com.sun.proxy.$Proxy99 ... [INFO] [ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0