Nashorn JSON.parse() - java.lang.OutOfMemoryError: Java heap space - JDK8u60

Question

Nashron Release notes claims they fixed the JSON parser bugs, but I am still able to produce a (different) bug on new patch 8u60. This time it is OutOfMemoryError.

Refer the attached JSON [1] (it is typically a Category & Subcategory relation). When I try to invoke JSON.parse() it is failing.

[1] http://jsfiddle.net/manivannandsekaran/rfftavkz/

1. I tried to increase the heap size, didn't help, instead of getting the OOM Exception quickly, it delayed bit.
2. When I replace all the integer key with Alpahnumberic, the entire parsing time is super fast. [2]

[2] https://jsfiddle.net/manivannandsekaran/8yw3ojmu/

It is almost 4 months we waited to get the original bug fixed, now again the new path introduced a another bug (it is really frustrating, I am not sure how these bugs are get escaped from regression). Is there any workaround available? Is it possible to override default JSON parser with other well known JSON parsers (like GSON or Jackson).

Here the stack trace of failure from JJS.

jjs> load("catsubcat/test.js")
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
        at jdk.nashorn.internal.runtime.arrays.IntArrayData.toObjectArray(IntArrayData.java:138)
        at jdk.nashorn.internal.runtime.arrays.IntArrayData.convertToObject(IntArrayData.java:180)
        at jdk.nashorn.internal.runtime.arrays.IntArrayData.convert(IntArrayData.java:192)
        at jdk.nashorn.internal.runtime.arrays.IntArrayData.set(IntArrayData.java:243)
        at jdk.nashorn.internal.runtime.arrays.ArrayFilter.set(ArrayFilter.java:99)
        at jdk.nashorn.internal.runtime.arrays.DeletedRangeArrayFilter.set(DeletedRangeArrayFilter.java:144)
        at jdk.nashorn.internal.parser.JSONParser.addArrayElement(JSONParser.java:246)
        at jdk.nashorn.internal.parser.JSONParser.parseObject(JSONParser.java:210)
        at jdk.nashorn.internal.parser.JSONParser.parseLiteral(JSONParser.java:165)
        at jdk.nashorn.internal.parser.JSONParser.parseObject(JSONParser.java:207)
        at jdk.nashorn.internal.parser.JSONParser.parseLiteral(JSONParser.java:165)
        at jdk.nashorn.internal.parser.JSONParser.parseObject(JSONParser.java:207)
        at jdk.nashorn.internal.parser.JSONParser.parseLiteral(JSONParser.java:165)
        at jdk.nashorn.internal.parser.JSONParser.parse(JSONParser.java:148)
        at jdk.nashorn.internal.runtime.JSONFunctions.parse(JSONFunctions.java:80)
        at jdk.nashorn.internal.objects.NativeJSON.parse(NativeJSON.java:105)
        at java.lang.invoke.LambdaForm$DMH/1880587981.invokeStatic_L3_L(LambdaForm$DMH)
        at java.lang.invoke.LambdaForm$BMH/1095293768.reinvoke(LambdaForm$BMH)
        at java.lang.invoke.LambdaForm$MH/1411892748.exactInvoker(LambdaForm$MH)
        at java.lang.invoke.LambdaForm$MH/22805895.linkToCallSite(LambdaForm$MH)
        at jdk.nashorn.internal.scripts.Script$5$test.:program(file:catsubcat/test.js:1)
        at java.lang.invoke.LambdaForm$DMH/1323165413.invokeStatic_LL_L(LambdaForm$DMH)
        at java.lang.invoke.LambdaForm$MH/653687670.invokeExact_MT(LambdaForm$MH)
        at jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:640)
        at jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:228)
        at jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:393)
        at jdk.nashorn.internal.runtime.Context.evaluateSource(Context.java:1219)
        at jdk.nashorn.internal.runtime.Context.load(Context.java:841)
        at jdk.nashorn.internal.objects.Global.load(Global.java:1536)
        at java.lang.invoke.LambdaForm$DMH/1323165413.invokeStatic_LL_L(LambdaForm$DMH)
        at java.lang.invoke.LambdaForm$BMH/1413378318.reinvoke(LambdaForm$BMH)
        at java.lang.invoke.LambdaForm$reinvoker/40472007.dontInline(LambdaForm$reinvoker)

Answer 1

The problem is just that Nashorn switches to sparse array representation too late. I filed a bug for this: https://bugs.openjdk.java.net/browse/JDK-8137281