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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Custom function pipe error","articleBody":"test in jsonata\n\n```\ndescribe(\"custom function pipe\", () =\u003e {\n    // Platform specific\n    describe(\"$add(1,2) ~\u003e $add(?, 3)\", function() {\n        it(\"should return 6\", async function() {\n            function add(a, b) {\n                return a + b;\n            }\n\n            var expr = jsonata(\"$add(1,2) ~\u003e $add(?, 3)\");\n            expr.registerFunction(\"add\", add);\n            var result = await expr.evaluate();\n            var expected = 6;\n            expect(result).to.be.equal(expected);\n        });\n    });\n});\n```\nsuccess resturn 6\n\ntest in jsonata java\n\n```\n  @Test\n  public void testCustomFunctionPipe() {\n    var expression = Jsonata.jsonata(\"$add(1, 2) ~\u003e $add(?, 3)\");\n    expression.registerFunction(\"add\", new JFunction(new JFunctionCallable() {\n      @SuppressWarnings(\"rawtypes\")\n      @Override\n      public Object call(Object input, List args) throws Throwable {\n        return (Integer) args.get(0) + (Integer) args.get(1);\n      }\n    }, null));\n    Assertions.assertEquals(6, expression.evaluate(null));\n  }\n```\nthrown Exception\n```\nProc not found null\n\ncom.dashjoin.jsonata.JException: Attempted to invoke a non-function\n\tat com.dashjoin.jsonata@0.9.9-local4/com.dashjoin.jsonata.Jsonata.applyInner(Jsonata.java:1782)\n\tat com.dashjoin.jsonata@0.9.9-local4/com.dashjoin.jsonata.Jsonata.apply(Jsonata.java:1705)\n\tat com.dashjoin.jsonata@0.9.9-local4/com.dashjoin.jsonata.Jsonata.evaluateApplyExpression(Jsonata.java:1547)\n\tat com.dashjoin.jsonata@0.9.9-local4/com.dashjoin.jsonata.Jsonata._evaluate(Jsonata.java:203)\n\tat com.dashjoin.jsonata@0.9.9-local4/com.dashjoin.jsonata.Jsonata.evaluate(Jsonata.java:131)\n\tat com.dashjoin.jsonata@0.9.9-local4/com.dashjoin.jsonata.Jsonata.evaluate(Jsonata.java:2607)\n\tat com.dashjoin.jsonata@0.9.9-local4/com.dashjoin.jsonata.Jsonata.evaluate(Jsonata.java:2568)\n\tat com.dashjoin.jsonata@0.9.9-local4/com.dashjoin.jsonata.CustomFunctionTest.testCustomFunctionPipe(CustomFunctionTest.java:65)\n```\n\nI need to use this call chain for another custom method. I used a simple \"add\" as an example.\nIn my case I can't use Fn2 because I need \"input\" data, but all Fn* interfaces pass only arguments.","author":{"url":"https://github.com/sergeevik","@type":"Person","name":"sergeevik"},"datePublished":"2026-01-25T01:06:53.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/83/jsonata-java/issues/83"}