👀 Views: 2 💬 Answers: 1 📅 Created: 2025-06-06

spring-boot maven classcastexception Java

I'm updating my dependencies and I've been struggling with this for a few days now and could really use some help... I'm relatively new to this, so bear with me. I'm stuck on something that should probably be simple. I'm working with a `ClassCastException` in my Spring Boot application (Spring Boot version 2.6.3) when trying to run a scheduled task that interacts with a legacy library. The behavior occurs specifically when the scheduled method attempts to cast a generic type to a specific type. The stack trace shows this: ``` java.lang.ClassCastException: class com.example.LegacyObject want to be cast to class com.example.MyObject ``` I've checked the dependencies in my `pom.xml`, and I see that there are conflicting versions of the same library being pulled in. The legacy library I’m using (`legacy-lib` version 1.0.0) has a transitive dependency on `dependency-lib` version 2.0.0, while my project directly depends on `dependency-lib` version 2.1.0. This seems to cause the class loader to load two different versions of the same class. I've tried to exclude the transitive dependency in my `pom.xml` like this: ```xml <dependency> <groupId>com.example</groupId> <artifactId>legacy-lib</artifactId> <version>1.0.0</version> <exclusions> <exclusion> <groupId>com.example</groupId> <artifactId>dependency-lib</artifactId> </exclusion> </exclusions> </dependency> ``` But it hasn't resolved the scenario. I've also cleared my Maven cache and rebuilt the project several times. I suspect that some other dependencies might still be pulling in the old version of `dependency-lib`. Is there a way to force the use of a specific version across all dependencies or any other strategies to resolve this conflict? Any help would be appreciated! For context: I'm using Java on Linux. My development environment is Linux. Any ideas what could be causing this? My development environment is Ubuntu 20.04. Hoping someone can shed some light on this. What are your experiences with this? Any ideas how to fix this?