Releases · jni-rs/jni-sys

It's alive! 😃

It's been about 6 years since the last release and although that's generally been OK, since the JNI API doesn't change that frequently, there have been a number of paper cuts adding up that this release hopefully helps to address.

Thanks to @sfackler for transferring the repo to the https://github.com/jni-rs Github organisation where we can hopefully keep the flame alive.

The most notable changes are that jboolean is now an alias for bool and that JNINativeInterface_ is now a union that namespaces the functions based on the JNI version when each function was added to the spec. Please see below for more details.

Added

Added JNI_VERSION_9, JNI_VERSION_10, JNI_VERSION_19, JNI_VERSION_20 and JNI_VERSION_21 constants
Added GetModule() to JNINativeInterface (#22)
IsVirtualThread() to JNINativeInterface (#32)
Implemented Debug trait for all types (#31)
Added support for no_std environments (#12)

Changed

jboolean is now an alias for bool instead of u8 (#23)
The JNIInvokeInterface_ and JNINativeInterface_ structs were turned into unions that namespace functions by version (#28):

This makes it much clearer what version of JNI you require to access any function safely.

So instead of a struct like:
```
struct JNINativeInterface_ {
    pub reserved0: *mut c_void,
    ..
    pub GetVersion: unsafe extern "system" fn(env: *mut JNIEnv) -> jint,
    ..
    pub NewLocalRef: unsafe extern "system" fn(env: *mut JNIEnv, ref_: jobject) -> jobject,
}
```
there is now a union like:
```
union JNINativeInterface_ {
    v1_1: JNINativeInterface__1_1,
    v1_2: JNINativeInterface__1_2,
    reserved: JNINativeInterface__reserved,
}
```
And you can access GetVersion like: env.v1_1.GetVersion and access NewLocalRef like: env.v1_2.NewLocalRef.

Each version struct includes all functions for that version and lower, so it's also possible to access GetVersion like env.v1_2.GetVersion.
Function pointers are no longer wrapped in an Option<> (#25)