when i add maven fast json in my class path ,it cant work. about druidry

[shizhengchao]

when i add maven fast json in my class path ,it cant work.

[shizhengchao]

where is DruidResponse class of the example, and i replace it as JSONObject, it cant also work .

List<JSONObject> responses = client.query(query, JSONObject.class);

Caused by: com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "timestamp" (class org.json.JSONObject), not marked as ignorable (0 known properties: ])
at [Source: (org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$UnCloseableInputStream); line: 1, column: 16] (through reference chain: java.util.ArrayList[0]->org.json.JSONObject["timestamp"])
at com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:61)
at com.fasterxml.jackson.databind.DeserializationContext.handleUnknownProperty(DeserializationContext.java:823)
at com.fasterxml.jackson.databind.deser.std.StdDeserializer.handleUnknownProperty(StdDeserializer.java:1153)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownProperty(BeanDeserializerBase.java:1589)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.handleUnknownVanilla(BeanDeserializerBase.java:1567)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.vanillaDeserialize(BeanDeserializer.java:294)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:151)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:286)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:245)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:27)
at com.fasterxml.jackson.databind.ObjectReader._bind(ObjectReader.java:1574)
at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:965)
at org.glassfish.jersey.jackson.internal.jackson.jaxrs.base.ProviderBase.readFrom(ProviderBase.java:838)
at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.invokeReadFrom(ReaderInterceptorExecutor.java:257)
at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.aroundReadFrom(ReaderInterceptorExecutor.java:236)
at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:156)
at org.glassfish.jersey.message.internal.MessageBodyFactory.readFrom(MessageBodyFactory.java:1091)
at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:874)

[shizhengchao]

if i add the maven in my class path,

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.58</version>
        </dependency>

i get the exception:

Caused by: com.alibaba.fastjson.JSONException: expect '[', but {, pos 1, line 1, column 2{"error":"Could not resolve type id 'TOPN' into a subtype of [simple type, class org.apache.druid.query.Query]: known type ids = [Query, dataSourceMetadata, groupBy, scan, search, segmentMetadata, select, timeBoundary, timeseries, topN]\n at [Source: HttpInputOverHTTP@77d8b899[c=778,q=0,[0]=null,s=STREAM]; line: 1, column: 745]"}
	at com.alibaba.fastjson.parser.DefaultJSONParser.parseArray(DefaultJSONParser.java:722)
	at com.alibaba.fastjson.serializer.CollectionCodec.deserialze(CollectionCodec.java:126)
	at com.alibaba.fastjson.parser.DefaultJSONParser.parseObject(DefaultJSONParser.java:689)
	at com.alibaba.fastjson.JSON.parseObject(JSON.java:378)
	at com.alibaba.fastjson.JSON.parseObject(JSON.java:443)
	at com.alibaba.fastjson.JSON.parseObject(JSON.java:551)
	at com.alibaba.fastjson.support.jaxrs.FastJsonProvider.readFrom(FastJsonProvider.java:413)
	... 16 more

[abhi195]

Hi @shizhengchao
The DruidResponse that is shown in Readme example is not actual class implemented in Druidry. That's just example for showing how can you map the response of the query to an object. You have to write you own mapping Class based on which query you are doing and than use that Class to map to query response.

Or simply you can use String result = client.query(query);. Here result will be a valid JSON string and you can map this string to JSONObject and use it.

[abhi-zapr]

Hey @shizhengchao

Is your issue resolved ? Let us know and we will close the issue.

[shizhengchao]

i found the reason of the issue :
because of the 'com.alibaba.fastjson', When serializing a class to json, the enum type defaults to output name。For example the when enum QueryType.TOPN serializing, it's TOPN, not topN。

[shizhengchao]

Hey @shizhengchao

Is your issue resolved ? Let us know and we will close the issue.

yes, i resolved, thank you