Using gson to deserialize json in native image fails #2464
Comments
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It looks as if the native image transformation is somehow losing track of the fact that the class is a record? A couple of things you could try: in the app you could print these: System.out.printf("isClass: %s\n", MicrosoftASRResponse.class.isRecord());
System.out.printf("Gson isClass: %s\n", com.google.gson.internal.reflect.ReflectionHelper.isRecord(MicrosoftASRResponse.class));I would expect both to print |
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in the native image,print this |
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Thanks, that's very helpful! I think the problem is here: isRecord = Class.class.getMethod("isRecord");
getRecordComponents = Class.class.getMethod("getRecordComponents");
// Class java.lang.reflect.RecordComponent
Class<?> classRecordComponent = getRecordComponents.getReturnType().getComponentType();
getName = classRecordComponent.getMethod("getName");
getType = classRecordComponent.getMethod("getType");This code uses reflection to access methods in Class<?> classRecordComponent = getRecordComponents.getReturnType().getComponentType();Probably if we changed that to this: Class<?> classRecordComponent = Class.forName("java.lang.reflect.RecordComponent");then everything would work. Meanwhile, you should be able to use manual configuration to tell GraalVM to support this reflective access. I think it would be something like this in a |
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It's working ,Thanks |
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Excellent news! |
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@eamonnmcmanus Is this fix in any release version yet, if not, when will a new version be deployed to maven central? |
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I'm not sure why it's not working on my side. I am on serializing list of record into json and get the following exception |
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@muhrifqii, did you follow the advice given in the exception message above?
Here is an example from Gson's integration tests. However, in the latest GraalVM versions it seems there is now a single |
Gson version
2.10.1
Java / Android version
17.0.8
Used tools
Description
I used gson in springboot, and the code works normally in normal mode. But I packaged the program into a native image and ran it, and an exception occurred.
Expected behavior
Actual behavior
Reproduction steps
String Duration) {
}
2. Gson gson = new Gson()
3. var asrResponse = gson.fromJson(s, MicrosoftASRResponse.class);
4. my reflect-config.json is
5.
[ { "name": "com.mobvoi.noise.microsoft.model.MicrosoftASRResponse", "allDeclaredFields": true, "allDeclaredConstructors": true, "allDeclaredMethods": true, "allPublicMethods": true, "allDeclaredClasses": true, "unsafeAllocated": true } ]Exception stack trace
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