Java REST API: Can not deserialize instance of Object out of START_ARRAY token -

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i have rest api written using java , jersey. below related code of web api.

 @get     @path("/getallphase1")     @produces(mediatype.application_json)       public list<phase1bean> getallphase1()     {         phase1interface phase1interface = new phase1impl();         list<phase1bean> allphase1 = phase1interface.getallphase1();         return allphase1;     }

in web application's rest client, wrote below code.

client client = clientbuilder.newclient();          client.target("http://localhost:8080/xxx/rest")             .path("phase1/getallphase1")             .request(mediatype.application_json)             .get(phase1bean.class);

unfortunatly generates below error

exception in thread "main" javax.ws.rs.client.responseprocessingexception: com.fasterxml.jackson.databind.jsonmappingexception: can not deserialize instance of bean.phase1bean out of start_array token  @ [source: org.glassfish.jersey.message.internal.readerinterceptorexecutor$uncloseableinputstream@2fb3536e; line: 1, column: 1]     @ org.glassfish.jersey.client.jerseyinvocation.translate(jerseyinvocation.java:806)     @ org.glassfish.jersey.client.jerseyinvocation.access$700(jerseyinvocation.java:92)     @ org.glassfish.jersey.client.jerseyinvocation$2.call(jerseyinvocation.java:700)     @ org.glassfish.jersey.internal.errors.process(errors.java:315)     @ org.glassfish.jersey.internal.errors.process(errors.java:297)     @ org.glassfish.jersey.internal.errors.process(errors.java:228)     @ org.glassfish.jersey.process.internal.requestscope.runinscope(requestscope.java:444)     @ org.glassfish.jersey.client.jerseyinvocation.invoke(jerseyinvocation.java:696)     @ org.glassfish.jersey.client.jerseyinvocation$builder.method(jerseyinvocation.java:420)     @ org.glassfish.jersey.client.jerseyinvocation$builder.get(jerseyinvocation.java:316)     @ jerseyclientget.main(jerseyclientget.java:32) caused by: com.fasterxml.jackson.databind.jsonmappingexception: can not deserialize instance of bean.phase1bean out of start_array token  @ [source: org.glassfish.jersey.message.internal.readerinterceptorexecutor$uncloseableinputstream@2fb3536e; line: 1, column: 1]     @ com.fasterxml.jackson.databind.jsonmappingexception.from(jsonmappingexception.java:164)     @ com.fasterxml.jackson.databind.deserializationcontext.mappingexception(deserializationcontext.java:691)     @ com.fasterxml.jackson.databind.deserializationcontext.mappingexception(deserializationcontext.java:685)     @ com.fasterxml.jackson.databind.deser.beandeserializerbase.deserializefromarray(beandeserializerbase.java:1215)     @ com.fasterxml.jackson.databind.deser.beandeserializer._deserializeother(beandeserializer.java:151)     @ com.fasterxml.jackson.databind.deser.beandeserializer.deserialize(beandeserializer.java:126)     @ com.fasterxml.jackson.databind.objectreader._bind(objectreader.java:1233)     @ com.fasterxml.jackson.databind.objectreader.readvalue(objectreader.java:677)     @ com.fasterxml.jackson.jaxrs.base.providerbase.readfrom(providerbase.java:777)     @ org.glassfish.jersey.message.internal.readerinterceptorexecutor$terminalreaderinterceptor.invokereadfrom(readerinterceptorexecutor.java:256)     @ org.glassfish.jersey.message.internal.readerinterceptorexecutor$terminalreaderinterceptor.aroundreadfrom(readerinterceptorexecutor.java:235)     @ org.glassfish.jersey.message.internal.readerinterceptorexecutor.proceed(readerinterceptorexecutor.java:155)     @ org.glassfish.jersey.message.internal.messagebodyfactory.readfrom(messagebodyfactory.java:1085)     @ org.glassfish.jersey.message.internal.inboundmessagecontext.readentity(inboundmessagecontext.java:874)     @ org.glassfish.jersey.message.internal.inboundmessagecontext.readentity(inboundmessagecontext.java:808)     @ org.glassfish.jersey.client.clientresponse.readentity(clientresponse.java:326)     @ org.glassfish.jersey.client.jerseyinvocation.translate(jerseyinvocation.java:803)     ... 10 more java result: 1

how can solve issue?

your method returning list, rather single phase1bean object - hence "start_array" token mentioned in error message. can change client .get() method receive list, , extract phase1bean items there.

client.target("http://localhost:8080/xxx/rest")         .path("phase1/getallphase1")         .request(mediatype.application_json)         .get(new generictype<list<phase1bean>>(){});

an alternative wrap list in object (phase1beanresponse, example), containing list , possibly other metadata related items.


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