Grails 2: debugger fails at method breakpoints

IU-182.4505.22
JRE 1.8.0_152-release-1293-b12x64
JetBrains s.r.o
OS Windows 7(amd64) v6.1 Service Pack 1
Grails version 2.5.5

STR: put the method breakpoint in controller just like this (test project attached)
```
def index(Integer max) { //method breakpoint here
print "ok"
params.max = Math.min(max ?: 10, 100)
respond Book.list(params), model:[bookInstanceCount: Book.count()]
}
```
and try to run debugger => get the message in the Debug toolwindow

_⚠️ attachment `image.png` was not included in the export_

That's all. Aplication doesn't run.
Replace the method breakpoint with the simple one => everything works normally.

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*Imported from [IDEA-199071](https://youtrack.jetbrains.com/issue/IDEA-199071) · Type: Bug · Votes: 0*
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Start by reproducing the method-breakpoint failure with Grails 2.5.5, JRE 1.8.0_152, and the controller example from the issue on Windows 7. Compare debugger startup with a simple breakpoint; done means the application launches and the method breakpoint works without the reported Debug toolwindow error.

Written by the indexing model from the issue text.