bindingsEngine.containsKey throws Exception when key is not found #7

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1. ctrueden commented on Dec 18, 2017

   

   ctrueden

   on Dec 18, 2017

   Last edited by ctrueden

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   I was not able to duplicate the NullPointerException (a stack trace would be helpful here).

   Actually, I did manage to produce a NullPointerException by running the above as Groovy, with a fully qualified javax.script.ScriptEngineManager, but the stack trace is:

   java.lang.NullPointerException: Cannot get property 'getContext' on null object
   	at org.codehaus.groovy.runtime.NullObject.getProperty(NullObject.java:60)
   	at org.codehaus.groovy.runtime.InvokerHelper.getProperty(InvokerHelper.java:174)
   	at org.codehaus.groovy.runtime.callsite.NullCallSite.getProperty(NullCallSite.java:47)
   	at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callGetProperty(AbstractCallSite.java:296)
   	at Script25.run(Script25.groovy:1)
   

   So I'm guessing the problem is not actually related to the containsKey call, which never occurs, but rather than use of getContext.

   Here is a Groovy script which gets farther, but certainly still demonstrates some weirdness:

   #@ ScriptService ss
   
   clojure = ss.getLanguageByName("clojure")
   println("Found Clojure language: " + clojure.getClass().getName())
   
   bindings = clojure.getScriptEngine().getBindings(javax.script.ScriptContext.ENGINE_SCOPE)
   
   // output all the keys
   println("Bindings has " + bindings.keySet().size() + " key-pairs:");
   for (key in bindings.keySet()) {
   	println("\t" + key + " = " + bindings.get(key))
   }
   
   // check for specific containment
   def contains(key) {
   	println("contains " + key + "? " + bindings.containsKey(key))
   }
   contains("context")
   contains("ui")
   contains("asdf")

   On my system, it produces:

   Found Clojure language: org.scijava.plugins.scripting.clojure.ClojureScriptLanguage
   Bindings has 0 key-pairs:
   contains context? true
   contains ui? true
   contains asdf? true
   

   Further digging needed.