java JsonMappingException：找不到非具体 Map 类型的反序列化器
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时间：2020-11-03 04:19:20 来源:igfitidea点击:
JsonMappingException: Can not find a deserializer for non-concrete Map type
提问by Elad Benda
String str = commonClient.authorizedRequestBuilder(commonClient.webTarget
.path("/apps/get_current_version/default/"+appName+"/"+appName)
.queryParam("object_type", "app"))
.accept(MediaType.APPLICATION_JSON_TYPE)
.get()
.readEntity(String.class);
i get
我明白了
str = {"versions": {"ap": "Not Set", "am": "topic-test-publisher-1.0.16", "il": "topic-test-publisher-1.0.16", "row": "topic-test-publisher-1.0.49"}, "provider": "gce"}
Then i have changed to this code
然后我改成了这个代码
Version version = commonClient.authorizedRequestBuilder(commonClient.webTarget
.path("/apps/get_current_version/default/"+appName+"/"+appName)
.queryParam("object_type", "app"))
.accept(MediaType.APPLICATION_JSON_TYPE)
.get(ClientResponse.class)
.readEntity(new GenericType<Version>(){});
and got an exception:
并得到一个例外：
Caused by: com.fasterxml.Hymanson.databind.JsonMappingException: Can not find a deserializer for non-concrete Map type [map type; class javax.ws.rs.core.MultivaluedMap, [simple type, class java.lang.String] -> [collection type; class java.util.List, contains [simple type, class java.lang.Object]]]
at com.fasterxml.Hymanson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:269)
at com.fasterxml.Hymanson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244)
at com.fasterxml.Hymanson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142)
at com.fasterxml.Hymanson.databind.DeserializationContext.findContextualValueDeserializer(DeserializationContext.java:428)
at com.fasterxml.Hymanson.databind.deser.std.StdDeserializer.findDeserializer(StdDeserializer.java:947)
at com.fasterxml.Hymanson.databind.deser.BeanDeserializerBase.resolve(BeanDeserializerBase.java:439)
at com.fasterxml.Hymanson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:296)
at com.fasterxml.Hymanson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244)
at com.fasterxml.Hymanson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142)
at com.fasterxml.Hymanson.databind.DeserializationContext.findContextualValueDeserializer(DeserializationContext.java:428)
at com.fasterxml.Hymanson.databind.deser.std.StdDeserializer.findDeserializer(StdDeserializer.java:947)
at com.fasterxml.Hymanson.databind.deser.BeanDeserializerBase.resolve(BeanDeserializerBase.java:439)
at com.fasterxml.Hymanson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:296)
at com.fasterxml.Hymanson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244)
at com.fasterxml.Hymanson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142)
at com.fasterxml.Hymanson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:461)
at com.fasterxml.Hymanson.databind.ObjectReader._findRootDeserializer(ObjectReader.java:1749)
at com.fasterxml.Hymanson.databind.ObjectReader._bind(ObjectReader.java:1465)
at com.fasterxml.Hymanson.databind.ObjectReader.readValue(ObjectReader.java:912)
at com.fasterxml.Hymanson.jaxrs.base.ProviderBase.readFrom(ProviderBase.java:810)
at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.invokeReadFrom(ReaderInterceptorExecutor.java:256)
at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.aroundReadFrom(ReaderInterceptorExecutor.java:235)
at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:155)
at org.glassfish.jersey.message.internal.MessageBodyFactory.readFrom(MessageBodyFactory.java:1085)
at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:874)
at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:808)
at org.glassfish.jersey.client.ClientResponse.readEntity(ClientResponse.java:326)
at org.glassfish.jersey.client.JerseyInvocation.translate(JerseyInvocation.java:803)
... 32 more
Caused by: java.lang.IllegalArgumentException: Can not find a deserializer for non-concrete Map type [map type; class javax.ws.rs.core.MultivaluedMap, [simple type, class java.lang.String] -> [collection type; class java.util.List, contains [simple type, class java.lang.Object]]]
at com.fasterxml.Hymanson.databind.deser.BasicDeserializerFactory.createMapDeserializer(BasicDeserializerFactory.java:1158)
at com.fasterxml.Hymanson.databind.deser.DeserializerCache._createDeserializer2(DeserializerCache.java:380)
at com.fasterxml.Hymanson.databind.deser.DeserializerCache._createDeserializer(DeserializerCache.java:352)
at com.fasterxml.Hymanson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:264)
... 59 more
where:
在哪里：
@JsonIgnoreProperties(ignoreUnknown = true)
public class Version {
@JsonProperty("am")
public String am;
@JsonProperty("row")
public String row;
@Override
public String toString() {
return "VersionDto{" +
"am='" + am + '\'' +
", row='" + row + '\'' +
'}';
}
}
How can i deserialize it differently?
我怎样才能以不同的方式反序列化它？
UPDATE
更新
I have tried:
我努力了：
with
和
public class Version {
public Map<String, String> versions;
public String provider;
// getters, setters, etc
}
and
和
Version version = commonClient.authorizedRequestBuilder(commonClient.webTarget
.path("/apps/get_current_version/gce/waze-prod/default/"+appName+"/"+appName)
.queryParam("object_type", "app"))
.accept(MediaType.APPLICATION_JSON_TYPE)
.get(ClientResponse.class)
.readEntity(Version.class);
but got the same error
但得到了同样的错误
采纳答案by Elad Benda
I would say the object Versionneed to have a field named versionsof type Map<String, String>and another one named providerof type String, and you probably don't need the GenericTypething.
我会说对象Version需要有一个名为versionstype的字段Map<String, String>和另一个名为providertype的字段String，你可能不需要这个GenericType东西。
public class Version {
private Map<String, String> versions;
private String provider;
// getters, setters, etc
}
then
然后
Version version = commonClient.authorizedRequestBuilder(commonClient.webTarget)
// ...
.readEntity(Version.class);
version.getVersions().get("am"); // to get "am"
Tested with
测试过
import com.fasterxml.Hymanson.databind.ObjectMapper;
import java.io.IOException;
import java.util.Map;
public class Test {
public static void main(String[] args) throws IOException {
String str = "{\"versions\": {\"ap\": \"Not Set\", \"am\": \"topic-test-publisher-1.0.16\", \"il\": \"topic-test-publisher-1.0.16\", \"row\": \"topic-test-publisher-1.0.49\"}, \"provider\": \"gce\"}";
ObjectMapper objectMapper = new ObjectMapper();
Version v = objectMapper.readValue(str, Version.class);
System.out.println(v.versions.get("am"));
}
public static class Version {
public Map<String, String> versions;
public String provider;
}
}
Output: "topic-test-publisher-1.0.16"
输出：“topic-test-publisher-1.0.16”
