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20603863
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0
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2013-12-16T05:08:42.797
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2013-12-16T05:33:36.603
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2013-12-16T05:33:36.603
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760854
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760854
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20512621
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2
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The <a href="http://download.java.net/jdk8/docs/technotes/guides/scripting/prog_guide/javascript.html#A1147390" rel="nofollow">doc</a> says ""Every JavaScript object implements the java.util.Map interface". But this sample test program shows thats not the case. <pre><code>public final class NashornTestMap { public static void main(String args[]) throws Exception{ ScriptEngineManager factory = new ScriptEngineManager(); ScriptEngine nashorn = factory.getEngineByName("nashorn"); nashorn.eval("" +"load(\"nashorn:mozilla_compat.js\");" + "importClass(Packages.NashornTestMap);" + "var map={};" + "map[\"Key\"]=String(\"Val\"); " + "var test = new NashornTestMap();" + "test.test(map);" + ""); } public void test(Map<String, String> obj){ System.out.println(obj); } } </code></pre> The above code give exception "Exception in thread "main" java.lang.ClassCastException: Cannot cast jdk.nashorn.internal.scripts.JO4 to java.util.Map". This <a href="http://marc.info/?l=openjdk-nashorn-dev&m=138016915730891" rel="nofollow">link</a> confirms this. However you can use Map inside your script and call the java objects directly, like this. <pre><code>public final class NashornTestMap { public static void main(String args[]) throws Exception{ ScriptEngineManager factory = new ScriptEngineManager(); ScriptEngine nashorn = factory.getEngineByName("nashorn"); nashorn.eval("" +"load(\"nashorn:mozilla_compat.js\");" + "importClass(Packages.NashornTestMap);" + "var HashMap = Java.type(\"java.util.HashMap\");" + "var map = new HashMap();" + "map.put(0, \"value1\");" + "var test = new NashornTestMap();" + "test.test(map);" + ""); } public void test(Map<String, String> obj){ System.out.println(obj); } } </code></pre> Returns "{0=value1}"
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1. POIs it worked Nashorn JS object to java.util.Map?
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1. USAtul Soman
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1. USAtul Soman
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