java - Reading updated variables after evaluating a script -

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i testing jsr 223 (scripting) code works rhino see how works nashorn. 1 area of difference in handling of updates variables passed in via bindings argument engine.eval(). in rhino, can use method pass in dynamic variable bindings when evaluating script , read out updated values of these variables after executing script. in nashorn, however, not work - values of variables in bindings object still present initial values after executing script.

to illustrate testng test case:

@test public void shouldsupportreadingvariablesfrombindings() throws exception {     // given     scriptengine engine = new scriptenginemanager().getenginebyname("javascript");     bindings vars = new simplebindings();     vars.put("state", 1);      // when     engine.eval("state = 2", vars);     number result = (number) vars.get("state");      //     assertequals(result.intvalue(), 2);  }

with rhino (apple jdk 1.6.0_65 on mac os x 10.9.3) test passes. nashorn (oracle jdk 1.8.0_b132) fails. i've tried variety of different approaches read variable afterwards - calling engine.get(), engine.getbindings(scriptcontext.engine_scope).get(), engine.getcontext().getbindings(...).get() etc. result null.

i can work if call engine.put("state", 1) , read afterwards engine.get("state"), seems bit messy compared passing in bindings argument.

reading jsr-223 spec, cannot find wording supports usage, engine-specific? there other way accomplish want in nashorn?

edit: 1 approach works wrap each variable in atomicreference , call explicit .set(..) methods on in javascript. ugly, possibly workable.

if pass bindings created scriptengine.createbindings, nashorn store updated value in bindings. (i tested.)

according the openjdk wiki , this openjdk bug, behavior difference between rhino , nashorn expected. nashorn not intended 100% drop-in compatible rhino.


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