cc_binary + libjvm.so i.e. how to build and run a JNI C++ app.

[Pete Stevenson]

Hi team at Bazel,

We are trying to use the JNI invocation API [1]. For this, we need to depend on a few JNI headers [2] and also libjvm.so. Specifically, we want to build a binary (using cc_binary) that creates the jvm and invokes a method inside of some compiled java code (in a .jar file, e.g.).

What is the correct way to depend on this collateral? In particular, is there an example on github or anywhere online that shows a cc_binary that depends on libjvm.so?

Thank you,

Pete Stevenson

[1] The JNI invocation API is referenced from the bazel docs, here:
https://docs.bazel.build/versions/main/be/java.html#java_binary.launcher

[2] We need the following headers:

jni.h, jvmti.h, and jni_md.h

[Fabian Meumertzheim]

I didn't find a good answer and set up a repository rule to find libjvm for Jazzer: https://github.com/CodeIntelligenceTesting/jazzer/blob/main/bazel/local_jdk_libjvm.bzl

The cc_library targets are in //driver.

 

This breaks with cross-compilation though, so I would really like to find a better solution.

[Fabian Meumertzheim]

I created a new ruleset, rules_jni (https://github.com/fmeum/rules_jni), to simplify building applications that use libjvm, JNI headers and Java native libraries. It can find libjvm at build and runtime, but within Bazel and in a deployment. 

An example using this ruleset can be found at https://github.com/fmeum/rules_jni/tree/main/tests/libjvm_stub.

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[Philipp Wollermann]

That looks very cool and useful, thank you Fabian!