Segfault problem in `NetLogo.init`

[sbacelar]

I was asked to install JRE legacy code on my Mac. I did it.
But I had to change one line of your code (NetLogo.init) because the folder containing NetLogo has a different path and I got an error. Please see what is the mistake I did:

Main> using NetLogo
Loaded /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/server/libjvm.dylib

Main> NetLogo.init("/Applications/Netlogo 6.0.4/Netlogo 6.0.4.app")

signal (11): Segmentation fault: 11
while loading no file, in expression starting on line 0
unknown function (ip: 0x11dad72b3)
Allocations: 4188932 (Pool: 4187476; Big: 1456); GC: 7

[nicolaspayette]

It seems like this is a known issue with the JavaCall.jl package that NetLogo.jl is using.

Does the execution "continues normally" for you after you get the error? Can you try starting Julia with --handle-signals=no as they are suggesting and see what happens?

[sbacelar]

Sorry, I don't know how to start Julia with --handle-signal=no in vscode.
Also, I wonder if the line should be NetLogo.init("/Applications/NetLogo 6.0.4/NetLogo 6.0.4.app")or something else. In your case it ends in app. Is this a folder?

[sbacelar]

I have run Julia from the Terminal using julia --handle-signal=no. The result is a little different:

Loaded /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/server/libjvm.dylib

julia> NetLogo.init("/Applications/NetLogo 6.0.4/NetLogo 6.0.4.app")

julia> NetLogo.withmodel("models/Sample Models/Biology/Moths.nlogo") do w
       NetLogo.command(w, "setup")
       light = NetLogo.report(w, "one-of lights")
       @show light
       @show light["intensity"]
       Base.length(light)
       println(collect(light))
       end
ERROR: Class Not Found org/nlogo/headless/HeadlessWorkspace$
Stacktrace:
 [1] _metaclass(::Symbol) at /Users/sergiobacelar/.julia/v0.6/JavaCall/src/core.jl:238
 [2] metaclass(::Symbol) at /Users/sergiobacelar/.julia/v0.6/JavaCall/src/core.jl:244
 [3] jfield(::Type{JavaCall.JavaObject{Symbol("org.nlogo.headless.HeadlessWorkspace$")}}, ::String, ::Type{T} where T) at /Users/sergiobacelar/.julia/v0.6/JavaCall/src/core.jl:148
 [4] companion(::Type{JavaCall.JavaObject{Symbol("org.nlogo.headless.HeadlessWorkspace")}}) at /Users/sergiobacelar/.julia/v0.6/NetLogo/src/NetLogo.jl:24
 [5] withworkspace(::NetLogo.##1#2{##1#2,String}) at /Users/sergiobacelar/.julia/v0.6/NetLogo/src/NetLogo.jl:36
 [6] withmodel(::##1#2, ::String) at /Users/sergiobacelar/.julia/v0.6/NetLogo/src/NetLogo.jl:45```

[nicolaspayette]

Sorry, I don't know how to start Julia with --handle-signal=no in vscode.

There is probably somewhere where could can set that option. You'd have to check the docs of julia-vscode or whichever vscode plugin you're using. Trying it from the command line was the right move for now.

I wonder if the line should be NetLogo.init("/Applications/NetLogo 6.0.4/NetLogo 6.0.4.app") or something else. In your case it ends in app. Is this a folder?

I don't know the directory structure on a Mac installation. What you need to pass to the NetLogo.init method is the folder where it can find netlogo-6.0.4.jar.

[nicolaspayette]

My colleagues with Macs tell me that folder should be /Applications/NetLogo 6.0.4/Java/. Can you try that?

[sbacelar]

Ok. Now it runs it opens java but with no results. Note: I used ../Javaand not ../Java/to access netlogo-6.0.4.jar. Here is what happened:

Loaded /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/server/libjvm.dylib

julia> NetLogo.init("/Applications/NetLogo 6.0.4/Java")

julia> NetLogo.withmodel("models/Sample Models/Biology/Moths.nlogo") do w
       NetLogo.command(w, "setup")
       light = NetLogo.report(w, "one-of lights")
       @show light
       @show light["intensity"]
       Base.length(light)
       println(collect(light))
       end```

[nicolaspayette]

Weird. Does it go back to the Julia prompt or just stays stuck there?

What if you try running these lines, one by one, instead of the version using withmodel?

[sbacelar]

It stays stuck. I have to interrupt now. I will come to this later. No dia 24/07/2018, às 18:56, Nicolas Payette <notifications@github.com> escreveu:

…

Weird. Does it go back to the Julia prompt or just stays stuck there? What if you try running these lines, one by one, instead of the version using withmodel? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or mute the thread.

[sbacelar]

When I run (some) of the lines you sent to me it gives an error and then opens bin and it stays stuck:

julia> using NetLogo
Loaded /Library/Java/JavaVirtualMachines/jdk1.8.0_144.jdk/Contents/Home/jre/lib/server/libjvm.dylib

julia> NetLogo.init("/Applications/NetLogo 6.0.4/Java")

signal (11): Segmentation fault: 11
while loading no file, in expression starting on line 0
unknown function (ip: 0x1265a22b3)
Allocations: 3947513 (Pool: 3946064; Big: 1449); GC: 6

julia> w = NetLogo.newWorkspace()