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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Regression in PyArray.pyset() for Boolean output setter","articleBody":"Jython 2.7.4 breaks old (proper) behavior exhibited by 2.5.2 and below for java receiver type expecting boolean[] array causing regression.\n\n**Jython 2.7.4 impl**: (broken)\nhttps://github.com/jython/jython/blob/3f256f4a79c828d8f1a3f3b95cad8c55ba1ddd0b/src/org/python/core/PyArray.java#L2213-L2220\n\n**Jython 2.5.2 impl**: (works)\nhttps://github.com/jython/jython/blob/85c0618a617f742b67e457e2674a88feba49e9b8/src/org/python/core/PyArray.java#L1470-L1477\n\n\nIn jython 2.5.2, for boolean array java receiver type, `ex: someFunc(boolean[] array)`, the input value whatever it was ie primitive-java/object-java/python type was being converted to java type using Py.tojava(value, type).\n\nBut in jython 2.7.4, for the same receiver type, the input value matters if it is java-primitive/java-object/python type since not all of the java-Object types implement __nonzero__() and PyBoolean type is for python boolean values, currently the incoming java-object values all default to PyObject base impl for __nonzero() **which just returns true always**.\nhttps://github.com/jython/jython/blob/3f256f4a79c828d8f1a3f3b95cad8c55ba1ddd0b/src/org/python/core/PyObject.java#L316-L318\n\nThis causes the inputs to the java-receiver function be all true, irrespective of what input was supplied from python script.\nex:\n\n```java\npublic class UnitUnderTest{\n    public void someFunc(boolean[] array){\n        if (array == null) {\n            System.out.println(\"null\");\n            return;\n        }\n\n        System.out.print(\"[\");\n        for (int i = 0; i \u003c array.length; i++) {\n            System.out.print(array[I]);\n            if (i \u003c (array.length-1)){\n                System.out.print(\", \");\n            }\n        }\n        System.out.print(\"]\");\n    }\n}\n```\n\n```python\nimport java.lang.Boolean as Boolean\nimport java.lang.Boolean as Integer\n\na = [Boolean(0), Boolean(1), Boolean(0)]         # java-object [\u003cjava.lang.Boolean\u003e, \u003cjava.lang.Boolean\u003e, \u003cjava.lang.Boolean\u003e]\nb = [0, 1, 0]                                    # python         [\u003cinteger\u003e, \u003cinteger\u003e, \u003cinteger\u003e]\nc = [Integer(0), Integer(1), Integer(0)]         # java-object [\u003cjava.lang.Integer\u003e, \u003cjava.lang.Integer\u003e, \u003cjava.lang.Integer\u003e]\n# d = [boolean(0)]                                 # INVALID - because python doesnt have a boolean keyword and cannot be imported as object unlike java.lang.Boolean.        \n\nimport UnitUnderTest as uut\n\nuut.someFunc(a)             # prints all values as true ?!\nuut.someFunc(b)             # prints properly due to int values being python type (PyInteger) and all python types implement non-zero()\nuut.someFunc(c)             # prints all values as true ?! \n```\n\n```python\n\n######## jython 2.5.2 output #######\n[false, true, false]                                # WORKS\n[false, true, false]                                # WORKS\nERROR: Arg Integer can't be coerced into boolean.   # WORKS! by throwing error\n\n```\n\n```python\n\n######## jython 2.7.4 output #######\n[true, true, true]      # FAIL!\n[false, true, false]    # WORKS\n[true, true, true]      # FAIL!\n\n```","author":{"url":"https://github.com/mahee96","@type":"Person","name":"mahee96"},"datePublished":"2026-01-09T17:48:20.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/411/jython/issues/411"}