René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"incorrect eval with deep (ThreadLocal context)","articleBody":"example input\n\n```\n{\n  \"funcs\": {\n    \"func\": \"$.a + $.b\"\n  },\n  \"a\": 3,\n  \"b\": 4\n}\n```\n\nquery `$eval($.funcs.func)`\n\nexpected result: 7\nin jsonata online https://try.jsonata.org/fU8Heq6ee work correct\n\n\u003cimg width=\"576\" height=\"207\" alt=\"Image\" src=\"https://github.com/user-attachments/assets/6d030372-b159-4f7e-8732-744f5be96293\" /\u003e\n\nsimple code in test jsonata-java\n```\n  @Test\n  public void testEvalDeep() {\n    Object input = Json.parseJson(\"{\" +\n            \"  \\\"funcs\\\": {\" +\n            \"    \\\"func\\\": \\\"$.a + $.b\\\"\" +\n            \"  },\" +\n            \"  \\\"a\\\": 3,\" +\n            \"  \\\"b\\\": 4\" +\n            \"}\");\n    var expression = Jsonata.jsonata(\"$eval($.funcs.func)\");\n    Object evaluate = expression.evaluate(input);\n    Assertions.assertEquals(7, evaluate);\n  }\n```\n\nresult:\n```\norg.opentest4j.AssertionFailedError: \nExpected :7\nActual   :null\n```\n\nWhile debugging, I discovered that the input data is stored in a threadLocal.\nWhen evaluatePath executes along a path, each new step stores a new `input` in the threadLocal. When the evaluatePath  completes, the previous operation returns, and the input data remains from the evaluatePath operation.","author":{"url":"https://github.com/sergeevik","@type":"Person","name":"sergeevik"},"datePublished":"2026-01-29T09:13:06.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/90/jsonata-java/issues/90"}