Exception while using ES6 features (template strings) with Nashorn on JDK 9

[Hannes Wallnöfer]

ES6 support is still work in progress, we only support some of it, so making it the default wouldn’t be a good idea. 

Hannes


> Am 26.04.2017 um 16:06 schrieb Karl Pietrzak <kap4020 at gmail.com>:
> 
> Any thoughts given to making --language=es6 the default?
> 
> On Wed, Apr 26, 2017 at 10:00 AM, Jim Laskey (Oracle) <
> james.laskey at oracle.com> wrote:
> 
>> You need to specify --language=es6 on the command line
>> 
>>> On Apr 26, 2017, at 10:25 AM, Mohammed Sanaulla <sanaulla123 at gmail.com>
>> wrote:
>>> 
>>> Hello All,
>>> 
>>> I am using build b166 of JDK 9.
>>> 
>>> And I tried to run the following code:
>>> 
>>> ScriptEngineManager engineManager = new ScriptEngineManager();
>>> ScriptEngine engine = engineManager.getEngineByName("nashorn");
>>> engine.eval("function sum(a, b) { return a + b; }");
>>> System.out.println(engine.eval("sum(1, 2);"));
>>> engine.eval("var name = 'Sanaulla'");
>>> System.out.println(engine.eval("print(`Hello Mr. ${name}`)"));
>>> 
>>> The sum(1,2) works fine by printing 3. But the other part i.e using
>>> template strings throws the following exception:
>>> 
>>> Exception in thread "main" javax.script.ScriptException: <eval>:1:6
>>> Expected an operand but found error
>>> print(`Hello Mr. ${name}`)
>>>     ^ in <eval> at line number 1 at column number 6
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.api.scripting.NashornScriptEngine.
>> throwAsScriptException(NashornScriptEngine.java:469)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.api.scripting.NashornScriptEngine.
>> compileImpl(NashornScriptEngine.java:536)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.api.scripting.NashornScriptEngine.
>> compileImpl(NashornScriptEngine.java:523)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.api.scripting.
>> NashornScriptEngine.evalImpl(NashornScriptEngine.java:401)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.api.scripting.
>> NashornScriptEngine.eval(NashornScriptEngine.java:154)
>>>       at
>>> java.scripting/javax.script.AbstractScriptEngine.eval(
>> AbstractScriptEngine.java:264)
>>>       at
>>> nashorn.demo/com.packt.JavascriptCodeFromJavaDemo.main(
>> JavascriptCodeFromJavaDemo.java:13)
>>> Caused by: jdk.nashorn.internal.runtime.ParserException: <eval>:1:6
>>> Expected an operand but found error
>>> print(`Hello Mr. ${name}`)
>>>     ^
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.AbstractParser.error(
>> AbstractParser.java:297)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.AbstractParser.error(
>> AbstractParser.java:282)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.unaryExpression(Parser.java:4443)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.expression(Parser.java:4601)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.conditionalExpression(Parser.java:4753)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.assignmentExpression(Parser.java:4692)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.argumentList(Parser.java:3706)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.leftHandSideExpression(Parser.java:3389)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.unaryExpression(Parser.java:4421)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.expression(Parser.java:4601)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.conditionalExpression(Parser.java:4753)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.assignmentExpression(Parser.java:4692)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.expression(Parser.java:4570)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.expression(Parser.java:4566)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.expressionStatement(Parser.java:1847)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.statement(Parser.java:1155)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.sourceElements(Parser.java:909)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.program(Parser.java:844)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.parse(Parser.java:325)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.parser.
>> Parser.parse(Parser.java:285)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.runtime.
>> Context.compile(Context.java:1500)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.runtime.
>> Context.compileScript(Context.java:1467)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.internal.runtime.
>> Context.compileScript(Context.java:750)
>>>       at
>>> jdk.scripting.nashorn/jdk.nashorn.api.scripting.NashornScriptEngine.
>> compileImpl(NashornScriptEngine.java:534)
>>>       ... 5 more
>>> 
>>> I even tried running template strings from jjs console, but I am facing
>>> same issue.
>>> 
>>> Can someone please guide me in using the ES6 features in Nashorn on JDK9?
>>> 
>>> Regards,
>>> Sanaulla
>> 
>> 
> 
> 
> -- 
> Karl