Cargo build fails with main.rs due to missing JNI_CreateJavaVM symbol

help
1

I'm encountering an issue when trying to build my Rust project using cargo build. The build fails with the following error:

error: linking with `cc` failed: exit code: 1
...
undefined reference to `JNI_CreateJavaVM`

The build works fine if I delete main.rs, but fails when it's present. I suspect the issue might be related to how Cargo.toml is configured, particularly whether the project is recognized as a library or a binary.

Steps to Reproduce:

  1. Clone the repository:
    git clone https://github.com/kouhe3/rust-jni-glue.git

  2. Checkout the specific commit:
    git checkout d61d94d33e30b273ba5eb87aa0809bc9774f051f

  3. Run cargo build

Expected Behavior:

The project should compile successfully without errors, even with main.rs present.

Actual Behavior:

The build fails with the undefined reference to JNI_CreateJavaVM error.

Additional Context:

  • The project uses JNI (Java Native Interface) and attempts to interact with Java VM.

  • The Cargo.toml might not be correctly configured for JNI dependencies or linking.

  • Deleting main.rs allows the build to succeed, suggesting the issue is specific to the binary entry point.

Questions:

  1. Is there a misconfiguration in Cargo.toml that prevents proper linking of JNI symbols?

  2. How can I ensure cargo build correctly identifies the project type (binary or library) and links the necessary JNI dependencies?

  3. Are there additional steps required to properly integrate JNI in Rust projects?

Any guidance or suggestions would be greatly appreciated!