HI, my code loads a Nashorn Script Engine binding values representing
metadata fields and allows user to write Javascript to modify those
metadata fields by passing the script to the eval method and then
checking for modified metadata values. It was working fine but as I have
increased the number of values added to the bindings I have unexpected
issues that some binding variables values are missing or changed despite
the script not modifying these values.
I am now able to mimic the problem with self contained example
|import javax.script.ScriptContext; import javax.script.ScriptEngine;
public class JsTest { public static void main(String[] args) throws
Exception { int numberOfBindingVars = Integer.parseInt(args[0]);
ScriptEngine engine; for(int i=0; i<10; i++) { engine = new
org.openjdk.nashorn.api.scripting.NashornScriptEngineFactory().getScriptEngine();
for(int k=0;k<numberOfBindingVars;k++) { engine.put("var"+k,"1963"); }
System.out.println(String.format("Bindings %d",
engine.getBindings(ScriptContext.ENGINE_SCOPE).size())); for(int
k=0;k<numberOfBindingVars;k++) { if(engine.get("var"+k)==null) {
System.out.println("Missing var"+k); } } } } } Running this with
parameter **400** works fine and gives me Bindings 400 Bindings 400
Bindings 400 Bindings 400 Bindings 400 Bindings 400 Bindings 400
Bindings 400 Bindings 400 Bindings 400 But if I increase parameter to
**500** the binding count is inconsistent , although wierdly checking
for each value doesnt reveal any missing. Bindings 500 Bindings 499
Bindings 498 Bindings 497 Bindings 496 Bindings 495 Bindings 494
Bindings 500 Bindings 499 Bindings 498 And if run with **1000** I get
inconsistent count again, also unable to find certain vars around the
500 mark Bindings 1000 Bindings 999 Missing var448 Bindings 1000
Bindings 999 Missing var448 Bindings 998 Missing var448 Missing var449
Bindings 997 Missing var448 Missing var449 Missing var450 Bindings 996
Missing var448 Missing var449 Missing var450 Missing var451 Bindings 995
Missing var448 Missing var449 Missing var450 Missing var451 Missing
var452 Bindings 994 Missing var448 Missing var449 Missing var450 Missing
var451 Missing var452 Missing var453 Bindings 993 Missing var448 Missing
var449 Missing var450 Missing var451 Missing var452 Missing var453
Missing var454 In all cases works okay the first time, but with the 500
and 1000 calls thesubsequent iterations are incorrect. Seems like there
is some other Nashorn process trimming the size of the bindings?|
