8000 Compiled JsonPath containing an aggregation function with [*] notation cannot be reused · Issue #1038 · json-path/JsonPath · GitHub
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Compiled JsonPath containing an aggregation function with [*] notation cannot be reused #1038

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turcsanyip opened this issue May 5, 2025 · 0 comments
Open

Compiled JsonPath containing an aggregation function with [*] notation cannot be reused #1038

turcsanyip opened this issue May 5, 2025 · 0 comments

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@turcsanyip
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        String jsonPath = "max($.dataset[*].value)";

        String json1 = "{\"dataset\": [{\"value\": 1}, {\"value\": 3}, {\"value\": 2}]}";
        String json2 = "{\"dataset\": [{\"value\": 4}, {\"value\": 3}, {\"value\": 2}]}";

        JsonPath compiledJsonPath = JsonPath.compile(jsonPath);

        System.out.println(compiledJsonPath.read(json1).toString());
        System.out.println(compiledJsonPath.read(json2).toString());

The first evaluation is successful but the second fails:

Exception in thread "main" com.jayway.jsonpath.JsonPathException: Aggregation function attempted to calculate value using empty array
	at com.jayway.jsonpath.internal.function.numeric.AbstractAggregation.invoke(AbstractAggregation.java:59)
	at com.jayway.jsonpath.internal.path.FunctionPathToken.evaluate(FunctionPathToken.java:41)
	at com.jayway.jsonpath.internal.path.RootPathToken.evaluate(RootPathToken.java:66)
	at com.jayway.jsonpath.internal.path.CompiledPath.evaluate(CompiledPath.java:99)
	at com.jayway.jsonpath.internal.path.CompiledPath.evaluate(CompiledPath.java:107)
	at com.jayway.jsonpath.JsonPath.read(JsonPath.java:179)
	at com.jayway.jsonpath.JsonPath.read(JsonPath.java:393)
	at com.jayway.jsonpath.JsonPath.read(JsonPath.java:377)

The issue affects 2.8.0 and 2.9.0 and it seems it was introduced with a60e96d.

There is a workaround to use max($.dataset..value) json path instead but it is not really nice and cannot work if the field being aggregated exists at different levels in the input data. The [*] notation should also work as it did in 2.7.0.
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