JuliaInterop / JuliaInterop/JavaCall.jl
Invoking a method that modifies an input parameter
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Description
I am invoking a Java method that accepts an array as a parameter and returns an int, something like int method(byte[] out). method is modifying the out parameter which I would like to pick Julia side.
On Julia side I have:
jout = Array{UInt8}(undef, 64)
jcall(object, "method", jint, (Array{jbyte,1}), jout)
But what I see is that jout is not affected by the invocation. How do I implemented this invocation pattern with JavaCall?
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the jcall invocation shown in the issue and inspect JavaCall.jl's handling of array arguments passed to Java methods. Reproduce the call with a mutable UInt8 array and compare its contents before and after method returns. Done means the Java method's changes to out are visible in jout, with a test covering the invocation pattern.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java, julia
- Domain
- developer-experience
- Issue type
- Feature
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100