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I am developing JDL file to generate my entites in JHipster. I have this entity:

entity Currency {
    name String required,
    conversionRate Double required min(0.0001) 
}

I got this error:

Executing jhipster:import-jdl entities.jdl

Options: The jdl is being parsed. An error has occurred: SyntaxError Error message: Expected ")", ['\n'|'\t'|'\r'|' '|
|
], or [0-9] but "." found.

Position: At l.9.

Error: SyntaxError: Expected ")", ['\n'|'\t'|'\r'|' '|
|
], or [0-9] but "." found. events.js:160 throw er; // Unhandled 'error' event ^

Error: ERROR! Error while parsing entities from JDL

at Environment.error (/Users/Macpro/Projects/pf-jhipster4/node_modules/yeoman-environment/lib/environment.js:157:40)
at error (/Users/Macpro/Projects/pf-jhipster4/node_modules/generator-jhipster/generators/generator-base.js:1964:18)
at parseJDL (/Users/Macpro/Projects/pf-jhipster4/node_modules/generator-jhipster/generators/import-jdl/index.js:113:26)
at Object.<anonymous> (/Users/Macpro/Projects/pf-jhipster4/node_modules/yeoman-generator/lib/index.js:399:25)
at /Users/Macpro/Projects/pf-jhipster4/node_modules/run-async/index.js:25:25
at /Users/Macpro/Projects/pf-jhipster4/node_modules/run-async/index.js:24:19
at self.env.runLoop.add.completed (/Users/Macpro/Projects/pf-jhipster4/node_modules/yeoman-generator/lib/index.js:400:11)
at runCallback (timers.js:672:20)
at tryOnImmediate (timers.js:645:5)
at processImmediate [as _immediateCallback] (timers.js:617:5)

I tried escaping the . with no success. Seems that, fraction is not accepted in double min value.

Note that, using integers Works with no problem, as example: 

conversionRate Double required min(1)
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