# Taro package ... what is this JULIA\_COPY\_STACKS?

**URL:** <https://discourse.julialang.org/t/taro-package-what-is-this-julia-copy-stacks/35417>\
**Category:** New to Julia\
**Created:** [March 2, 2020, 4:40pm UTC](https://discourse.julialang.org/t/taro-package-what-is-this-julia-copy-stacks/35417 "2020-03-02T16:40:10Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Darione](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/darione/32/12160_2.png) [@Darione](https://discourse.julialang.org/u/Darione)\
**Post date:** [March 2, 2020, 4:40pm UTC](https://discourse.julialang.org/t/taro-package-what-is-this-julia-copy-stacks/35417/1 "2020-03-02T16:40:10Z")

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Setting JULIA\_COPY\_STACKS 1 or yes, make Taro package working … but it breaks the REPL of Juno, that doesn’t load Julia …

What is this JULIA\_COPY\_STACKS ? how can i use Taro package without breaking the juno REPL ?

```julia
julia> import Taro
┌ Warning: JavaCall needs the environment variable `JULIA_COPY_STACKS` to be `1` or `yes`.
│ Calling the JVM may result in undefined behavior.
└ @ JavaCall C:\Users\dario\.julia\packages\JavaCall\0wJQZ\src\JavaCall.jl:38

```

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**Author:** ![Tamas\_Papp](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/tamas_papp/32/25949_2.png) [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Post date:** [March 3, 2020, 7:14am UTC](https://discourse.julialang.org/t/taro-package-what-is-this-julia-copy-stacks/35417/2 "2020-03-03T07:14:20Z")

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x-ref [Problem in running Julia on Juno](https://discourse.julialang.org/t/problem-in-running-julia-on-juno/35412)

please don’t open multiple topics for the same issue.

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<div class="post-metadata">

**Author:** ![Darione](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/darione/32/12160_2.png) [@Darione](https://discourse.julialang.org/u/Darione)\
**Post date:** [March 3, 2020, 11:11pm UTC](https://discourse.julialang.org/t/taro-package-what-is-this-julia-copy-stacks/35417/3 "2020-03-03T23:11:27Z")

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OK, i perfectly understand. Sorry.