👀 Views: 32 💬 Answers: 1 📅 Created: 2025-06-14

maven multi-module dependency-management Java

I've searched everywhere and can't find a clear answer. I've looked through the documentation and I'm still confused about I recently switched to I'm working with a `java.lang.NoClassDefFoundError` during the Maven build of my multi-module project when trying to include a custom library that's located in a separate module. The structure of my project is as follows: ``` my-parent-project ├── pom.xml ├── module-a │ └── pom.xml └── module-b └── pom.xml ``` In `module-a`, I have the following dependency in the `pom.xml`: ```xml <dependency> <groupId>com.example</groupId> <artifactId>module-a</artifactId> <version>1.0-SNAPSHOT</version> </dependency> ``` In `module-b`, I'm trying to reference a class from `module-a`, and here's the relevant part of `pom.xml`: ```xml <dependency> <groupId>com.example</groupId> <artifactId>module-a</artifactId> <version>1.0-SNAPSHOT</version> </dependency> ``` However, when I run `mvn clean install`, the build fails with the following behavior: ``` [behavior] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project module-b: Compilation failure: Compilation failure: [behavior] /path/to/module-b/src/main/java/com/example/Main.java:[5,35] behavior: want to find symbol [behavior] symbol: class SomeClass ``` I've tried several things to resolve this scenario: 1. Ensured that both modules are properly defined as children in the parent `pom.xml`: ```xml <modules> <module>module-a</module> <module>module-b</module> </modules> ``` 2. Verified that `module-a` compiles successfully on its own by running `mvn clean install` in its directory. 3. Cleaned the project using `mvn clean` and re-installed. Despite these efforts, I'm still working with the same behavior during the build of `module-b`. Any insights into what might be going wrong or how to fix this would be greatly appreciated! My development environment is macOS. Has anyone else encountered this? Is there a better approach? What would be the recommended way to handle this? For context: I'm using Java on CentOS.