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From "Woonsan Ko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SCXML-234) Unit test (ScriptTest) fails on Java 1.8 due to new JS Engine
Date Sun, 12 Jul 2015 15:14:04 GMT

    [ https://issues.apache.org/jira/browse/SCXML-234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14623846#comment-14623846
] 

Woonsan Ko commented on SCXML-234:
----------------------------------

Fixed by merging this PR: https://github.com/apache/commons-scxml/pull/1

The main difference made in nashorn JavaScriptEngine (Java 1.8), from user's perspective,
is "user can supply any ScriptContext implementation containing any Bindings object as ENGINE_SCOPE,
nashorn engine cannot always assume ENGINE_SCOPE Bindings to be backed by a nashorn Global
instance." [1]
So, the user should retrieve the nashorn global object (the only location where the evaluated
variables are stored) like the example [1]:

{code}
// nashorn engine associates a fresh nashorn Global with the ENGINE_SCOPE
   Object obj = myNewContext.getBindings(ScriptContext.ENGINE_SCOPE);
   Object nashornGlobal = ((Bindings)obj).get("nashorn.global"); 
   // "nashorn.global" is the key used to associate
   ScriptObjectMirror globalMirror = (ScriptObjectMirror) nashornGlobal;
{code}

Luckily ScriptObjectMirror is javax.script.Bindings type, so I used Bindings to cast the nashorn.globals
when available. This makes it compatible with standard API usages, without having to depend
on nashorn specific APIs.
Also, I was able to check if nashorn.globals is available or not, so this fix would make the
test work on both Java 1.8 and earlier versions.

[1] https://wiki.openjdk.java.net/display/Nashorn/Nashorn+jsr223+engine+notes

> Unit test (ScriptTest) fails on Java 1.8 due to new JS Engine
> -------------------------------------------------------------
>
>                 Key: SCXML-234
>                 URL: https://issues.apache.org/jira/browse/SCXML-234
>             Project: Commons SCXML
>          Issue Type: Bug
>            Reporter: Woonsan Ko
>            Assignee: Woonsan Ko
>             Fix For: 2.0
>
>
> One unit test fails:
> {code}
> Running org.apache.commons.scxml2.model.ScriptTest
> Tests run: 2, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.226 sec <<<
FAILURE! - in org.apache.commons.scxml2.model.ScriptTest
> testJavaScriptExecution(org.apache.commons.scxml2.model.ScriptTest)  Time elapsed: 0.218
sec  <<< FAILURE!
> org.junit.ComparisonFailure: expected:<[end]> but was:<[script]>
> 	at org.junit.Assert.assertEquals(Assert.java:115)
> 	at org.junit.Assert.assertEquals(Assert.java:144)
> 	at org.apache.commons.scxml2.model.ScriptTest.testJavaScriptExecution(ScriptTest.java:49)
> {code}
> Tested on JDK 1.8.



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