java - 意外字符 ('a'(代码 97)) : expected a valid value (number, 字符串、数组、对象、 'true'、 'false' 或 'null')

Question

我刚刚尝试调用index.jsp它使用 http POST 将 json 发送到我的 rest 项目。
但这给我带来了这个错误:
我无法弄清楚问题出在哪里
任何提示？我对此没有想法。

org.apache.catalina.core.StandardWrapperValve invokeGRAVE: Servlet.service() for servlet [jersey-serlvet] in context with path [/HibernateTutorialWeb] threw exception [org.codehaus.jackson.JsonParseException: Unexpected character ('a' (code 97)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')at [Source: org.apache.catalina.connector.CoyoteInputStream@24097548; line: 1, column: 2]] with root causeorg.codehaus.jackson.JsonParseException: Unexpected character ('a' (code 97)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')at [Source: org.apache.catalina.connector.CoyoteInputStream@24097548; line: 1, column: 2]at org.codehaus.jackson.JsonParser._constructError(JsonParser.java:1213)at org.codehaus.jackson.impl.JsonParserMinimalBase._reportError(JsonParserMinimalBase.java:375)at org.codehaus.jackson.impl.JsonParserMinimalBase._reportUnexpectedChar(JsonParserMinimalBase.java:306)at org.codehaus.jackson.impl.Utf8StreamParser._handleUnexpectedValue(Utf8StreamParser.java:1536)at org.codehaus.jackson.impl.Utf8StreamParser._nextTokenNotInObject(Utf8StreamParser.java:432)at org.codehaus.jackson.impl.Utf8StreamParser.nextToken(Utf8StreamParser.java:318)at org.codehaus.jackson.map.ObjectMapper._initForReading(ObjectMapper.java:2168)at org.codehaus.jackson.map.ObjectMapper._readValue(ObjectMapper.java:2106)at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1004)at org.codehaus.jackson.jaxrs.JacksonJsonProvider.readFrom(JacksonJsonProvider.java:410)at com.sun.jersey.json.impl.provider.entity.JacksonProviderProxy.readFrom(JacksonProviderProxy.java:139)at com.sun.jersey.spi.container.ContainerRequest.getEntity(ContainerRequest.java:474)at com.sun.jersey.server.impl.model.method.dispatch.EntityParamDispatchProvider$EntityInjectable.getValue(EntityParamDispatchProvider.java:123)at com.sun.jersey.server.impl.inject.InjectableValuesProvider.getInjectableValues(InjectableValuesProvider.java:46)at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$EntityParamInInvoker.getParams(AbstractResourceMethodDispatchProvider.java:153)at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:203)at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469)at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400)at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349)at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339)at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699)at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Unknown Source)

index.jsp :

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
        <title>Send jSon - put method</title>

    </head>
    <body>
    <script>
    //var people = {"address": "Address 12", "name": "twelve", "id": 12,"surname": "twelve"};
    var people={"address": "hello"};
    function sendobject(){
      $.ajax({
            type: "POST",
            url: "http://localhost:8080/HibernateTutorialWeb/rest/person/post",
            data: people,
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function(data){alert(data);},
            failure: function(errMsg) {
                alert(errMsg);
            }
      });
    }
    </script>
        <input type="button" onclick="sendobject()" value="invia"> </input>
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
    </body>
</<html>

人员服务。 java

package com.ws.service;

import java.util.List;

import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.ResponseBuilder;

import com.dao.*;
import com.model.*;

@Path("/person")
public class PersonService {

    // try hello data
    // http://localhost:8080/HibernateTutorialWeb/rest/person/hello/mario
    @GET
    @Path("/hello/{param}")
    public Response getMsg(@PathParam("param") String msg) {

        String output = "Jersey say hello : " + msg;

        return Response.status(200).entity(output).build();
    }

    // http://localhost:8080/HibernateTutorialWeb/rest/person/2
    @GET
    @Path("{id}")
    @Produces(MediaType.APPLICATION_JSON)
    public Person getPersonById(@PathParam("id") int id) {
        return new PersonDao().getPersonById(id);
        // error for type of response incorrect
        /*
         * public ResponseBuilder getPersonById(@PathParam("id") int id){
         * PersonDao pDao = new PersonDao (); if(pDao.getPersonById(id) != null)
         * {return Response.status(200).entity(new
         * PersonDao().getPersonById(id));} else{ return
         * Response.status(200).entity("Utente id: "+ id + ", Rimosso"); }
         */
    }

    // //http://localhost:8080/HibernateTutorialWeb/rest/person/getAllJson
    @GET
    @Path("/getAllJson")
    @Produces(MediaType.APPLICATION_JSON)
    public List<Person> getAllJson() {
        return new PersonDao().getAllPerson();
    }

    @GET
    @Path("/xml/{id}")
    @Produces(MediaType.APPLICATION_XML)
    public Person getPersonByIdXML(@PathParam("id") int id) {
        return new PersonDao().getPersonById(id);
    }

    @POST
    @Path("/post")
    @Produces(MediaType.APPLICATION_JSON)
    @Consumes(MediaType.APPLICATION_JSON)
    public Response createUtenteJSON(Person person) {
        new PersonDao().saveOrUpdate(person);
        String result = "Person saved : " + person;
        return Response.status(201).entity(result).build();
    }

    @PUT
    @Consumes(MediaType.APPLICATION_JSON)
    public Response updateUtente(Person person) {
        if (person.getId() != 0) {
            new PersonDao().saveOrUpdate(person);
            return Response.ok(person, MediaType.APPLICATION_JSON).build();
        } else {
            return Response.status(Response.Status.BAD_REQUEST)
                    .entity("Specificare l'id dell'utente").build();
        }
    }

    @DELETE
    @Path("{id}")
    public Response removePerson(@PathParam("id") Integer id) {
        new PersonDao().deletePerson(id);
        return Response.status(200).entity("Utente id: " + id + ", Rimosso")
                .build();
    }

}

PersonDao.java

package com.dao;

import java.util.ArrayList;
import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;

import com.model.Person;
import com.util.SessionFactoryUtil;

public class PersonDao {

    public void saveOrUpdate(Person person) {
        Transaction trns = null;
        Session session = SessionFactoryUtil.getSessionFactory().openSession();

        try {
            trns = session.beginTransaction();
            if (person.getId() != 0) {
                //if exists update obj
                session.update(person);
            } else {
                session.save(person);
            }
            session.getTransaction().commit();
        } catch (RuntimeException e) {
            if (trns != null) {
                trns.rollback();
            }
            e.printStackTrace();
        } finally {
            session.flush();
            session.close();
        }
    }

    public void deletePerson(int id) {
        Transaction trns = null;
        Session session = SessionFactoryUtil.getSessionFactory().openSession();
        try {
            trns = session.beginTransaction();
            Person person = (Person) session.load(Person.class, new Integer(id));
            
            System.out.println("Deleted person :"+person.toString());
            
            session.delete(person);
            
            session.getTransaction().commit();
        } catch (RuntimeException e) {
            if (trns != null) {
                trns.rollback();
            }
            e.printStackTrace();
        } finally {
            session.flush();
            session.close();
        }

    }

    public List<Person> getAllPerson() {
        List<Person> people = new ArrayList<Person>();
        Transaction trns = null;
        Session session = SessionFactoryUtil.getSessionFactory().openSession();
        try {
            trns = session.beginTransaction();
            people = session.createQuery("from Person").list();
            
            //session.getTransaction().commit();
        } catch (RuntimeException e) {
            if (trns != null) {
                trns.rollback();
            }
        } finally {
            session.flush();
            session.close();
        }
        System.out.println("People list : \n");
        for(int i=0;i<people.size();i++){
            System.out.println(people.get(i));
        }
        return people;
    }

    public Person getPersonById(int id) {
        Person person = null;
        Transaction trns = null;
        Session session = SessionFactoryUtil.getSessionFactory().openSession();
        try {
            trns = session.beginTransaction();
            String queryString = "FROM Person WHERE id = :id";
            Query query = session.createQuery(queryString);
            query.setInteger("id", id);
            person = (Person) query.uniqueResult();
        } catch (RuntimeException e) {
            e.printStackTrace();
        } finally {
            session.flush();
            session.close();
        }
        return person;
    }

}

更新:
在 index.jsp 上

var people = JSON.parse({"address": "Indirizzo 12", "name": "dodici", "id": 12,"surname": "dodici"});

现在错误是这样的:

    HTTP Status 500 - java.io.EOFException: No content to map to Object due to end of input

type Exception report

message java.io.EOFException: No content to map to Object due to end of input

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: java.io.EOFException: No content to map to Object due to end of input
    com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:420)
    com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
    com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.io.EOFException: No content to map to Object due to end of input
    org.codehaus.jackson.map.ObjectMapper._initForReading(ObjectMapper.java:2173)
    org.codehaus.jackson.map.ObjectMapper._readValue(ObjectMapper.java:2106)
    org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1004)
    org.codehaus.jackson.jaxrs.JacksonJsonProvider.readFrom(JacksonJsonProvider.java:410)
    com.sun.jersey.json.impl.provider.entity.JacksonProviderProxy.readFrom(JacksonProviderProxy.java:139)
    com.sun.jersey.spi.container.ContainerRequest.getEntity(ContainerRequest.java:474)
    com.sun.jersey.server.impl.model.method.dispatch.EntityParamDispatchProvider$EntityInjectable.getValue(EntityParamDispatchProvider.java:123)
    com.sun.jersey.server.impl.inject.InjectableValuesProvider.getInjectableValues(InjectableValuesProvider.java:46)
    com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$EntityParamInInvoker.getParams(AbstractResourceMethodDispatchProvider.java:153)
    com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:203)
    com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
    com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
    com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
    com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
    com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
    com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1469)
    com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1400)
    com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1349)
    com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1339)
    com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:416)
    com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
    com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:699)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

Answer 1

尝试更改Object至JSON线:

var people={"address": "ciao"};

到:

var people=JSON.stringify(eval({"address": "ciao"}));

确保 Person类具有您传递给它的相同参数构造函数。

根据您在评论中的图像堆栈跟踪异常，错误发生在 Hibernate异常(exception) StaleStateException意思是:

Thrown when a version number or timestamp check failed, indicating that the Session contained stale data (when using long transactions with versioning). Also occurs if we try delete or update a row that does not exist

这可以通过从数据库中更新对象来解决，例如 hibernate 中的刷新方法，然后提交会将对象持久保存在数据库中。

您可以使用合并方法和提交，但在这里您将覆盖当前数据。

使用锁也可以解决改变状态。