# JavaCall first time

**URL:** <https://discourse.julialang.org/t/javacall-first-time/9611>\
**Category:** General Usage\
**Created:** [March 9, 2018, 3:53pm UTC](https://discourse.julialang.org/t/javacall-first-time/9611 "2018-03-09T15:53:21Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![bramtayl](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/bramtayl/32/3614_2.png) [@bramtayl](https://discourse.julialang.org/u/bramtayl)\
**Post date:** [March 9, 2018, 3:53pm UTC](https://discourse.julialang.org/t/javacall-first-time/9611/1 "2018-03-09T15:53:21Z")

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I’m trying to get JavaCall set up.

My java\_home is “C:/Program Files/Java/jre1.8.0\_151”.  
I tried changing it to “C:/Program Files (x86)/Java/jre1.8.0\_151” to no avail.

```julia
julia> JavaCall.init(["-Xmx4g"])
Unable to initialise Java VM: -5
init(::Array{String,1}) at jvm.jl:171
include_string(::String, ::String) at loading.jl:522
include_string(::String, ::String, ::Int64) at eval.jl:30
include_string(::Module, ::String, ::String, ::Int64, ::Vararg{Int64,N} where N) at eval.jl:34
(::Atom.##100#105{String,Int64,String})() at eval.jl:75
withpath(::Atom.##100#105{String,Int64,String}, ::Void) at utils.jl:30
withpath(::Function, ::String) at eval.jl:38
hideprompt(::Atom.##99#104{String,Int64,String}) at repl.jl:60
macro expansion at eval.jl:73 [inlined]
(::Atom.##98#103{Dict{String,Any}})() at task.jl:80

```

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<div class="post-metadata">

**Author:** ![ExpandingMan](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/expandingman/32/866_2.png) [@ExpandingMan](https://discourse.julialang.org/u/ExpandingMan)\
**Post date:** [March 9, 2018, 3:58pm UTC](https://discourse.julialang.org/t/javacall-first-time/9611/2 "2018-03-09T15:58:20Z")

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This looks like a problem with JavaCall finding the JVM. The documentation says something about using “WinReg” on windows to detect this automatically. Does this ring any bells? @avik may know more.

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<div class="post-metadata">

**Author:** ![bramtayl](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/bramtayl/32/3614_2.png) [@bramtayl](https://discourse.julialang.org/u/bramtayl)\
**Post date:** [March 9, 2018, 3:58pm UTC](https://discourse.julialang.org/t/javacall-first-time/9611/3 "2018-03-09T15:58:46Z")

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Restarting Julia worked…