bindingsEngine.containsKey throws Exception when key is not found

[mslinn]

If no variable called ten is defined, the following Scala code throws java.lang.NullPointerException:

new ScriptEngineManager()
  .getEngineByName("clojure")
  .getContext
  .getBindings(ScriptContext.ENGINE_SCOPE)
  .containsKey("ten")

Similar code works for scripting-scala. However, this bug can is also present for scripting-java

[ctrueden]

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.