如何解决此错误TransactionException：提交失败？

Question

我有一个像这样的帖子请求ajax：

$.ajax({
           "url":serverPath+"/taxiws/clients",
           "type": "POST",
           contentType: "application/json",
            dataType: "text",
           "data": JSON.stringify(obj),
           "success": function(data) {
               console.log("success!!!");
            $("#LoadingBackgroundPopup").hide();
            window.location.href="reservationclient.html";

},"error": function(error) {
console.log(error);
}
});

方法在网络服务中发布：

@RequestMapping(method = RequestMethod.POST, headers = "Accept=application/json")
    public ResponseEntity<String> createFromJson(@RequestBody String json, UriComponentsBuilder uriBuilder) {
        HttpHeaders headers = new HttpHeaders();
        headers.add("Content-Type", "application/json");
        System.out.println("hello post");
        try {
            Client client = Client.fromJsonToClient(json);
            BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
            String hashedPassword = passwordEncoder.encode(client.getPassword());

            client.setPassword(hashedPassword);
            System.out.println("Passowrd hashé    "+hashedPassword);
            client.persist();
            RequestMapping a = (RequestMapping) getClass().getAnnotation(RequestMapping.class);
            headers.add("Location",uriBuilder.path(a.value()[0]+"/"+client.getIdclient().toString()).build().toUriString());
            return new ResponseEntity<String>(headers, HttpStatus.CREATED);
        } catch (Exception e) {
            return new ResponseEntity<String>("{\"ERROR\":"+e.getMessage()+"\"}", headers, HttpStatus.INTERNAL_SERVER_ERROR);
        }
    }

但是当我执行这个问题时，我发现了这个问题：

!JavaScript LOG: {"ERROR":org.hibernate.TransactionException: commit failed; nested exception is javax.persistence.PersistenceException: org.hibernate.TransactionException: commit failed"} 

我添加了这个命令行e.getStackTrace（）;在我的网络服务中，我发现了这个问题：

2016-04-14 11:56:57,043 [http-bio-8080-exec-5] ERROR org.springframework.transaction.aspectj.AnnotationTransactionAspect - Application exception overridden by rollback exception
org.springframework.orm.jpa.JpaSystemException: org.hibernate.exception.ConstraintViolationException: could not execute statement; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: could not execute statement
    at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:321)
    at org.springframework.orm.jpa.aspectj.JpaExceptionTranslatorAspect.ajc$afterThrowing$org_springframework_orm_jpa_aspectj_JpaExceptionTranslatorAspect$1$18a1ac9(JpaExceptionTranslatorAspect.aj:33)
    at com.binov.webservice.web.Client.persist_aroundBody26(Client.java:243)
    at com.binov.webservice.web.Client$AjcClosure27.run(Client.java:1)
    at org.springframework.transaction.aspectj.AbstractTransactionAspect.ajc$around$org_springframework_transaction_aspectj_AbstractTransactionAspect$1$2a73e96cproceed(AbstractTransactionAspect.aj:59)
    at org.springframework.transaction.aspectj.AbstractTransactionAspect$AbstractTransactionAspect$1.proceedWithInvocation(AbstractTransactionAspect.aj:65)
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
    at org.springframework.transaction.aspectj.AbstractTransactionAspect.ajc$around$org_springframework_transaction_aspectj_AbstractTransactionAspect$1$2a73e96c(AbstractTransactionAspect.aj:63)
    at com.binov.webservice.web.Client.persist(Client.java:241)
    at com.binov.webservice.ClientController.createFromJson(ClientController.java:69)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    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.filters.CorsFilter.handleSimpleCORS(CorsFilter.java:302)
    at org.apache.catalina.filters.CorsFilter.doFilter(CorsFilter.java:170)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    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:504)
    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:421)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1074)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:314)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:745)
Caused by: javax.persistence.PersistenceException: org.hibernate.exception.ConstraintViolationException: could not execute statement
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1763)
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1677)
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1683)
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1187)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:241)
    at com.sun.proxy.$Proxy36.persist(Unknown Source)
    ... 57 more
Caused by: org.hibernate.exception.ConstraintViolationException: could not execute statement
    at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:129)
    at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:211)
    at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:96)
    at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:58)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3032)
    at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3558)
    at org.hibernate.action.internal.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:98)
    at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:490)
    at org.hibernate.engine.spi.ActionQueue.addResolvedEntityInsertAction(ActionQueue.java:195)
    at org.hibernate.engine.spi.ActionQueue.addInsertAction(ActionQueue.java:179)
    at org.hibernate.engine.spi.ActionQueue.addAction(ActionQueue.java:214)
    at org.hibernate.event.internal.AbstractSaveEventListener.addInsertAction(AbstractSaveEventListener.java:324)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:288)
    at org.hibernate.event.internal.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:194)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:125)
    at org.hibernate.jpa.event.internal.core.JpaPersistEventListener.saveWithGeneratedId(JpaPersistEventListener.java:84)
    at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:206)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:149)
    at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:75)
    at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:811)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:784)
    at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:789)
    at org.hibernate.jpa.spi.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:1181)
    ... 63 more
Caused by: org.postgresql.util.PSQLException: ERROR: null value in column "idclient" violates not-null constraint
  Détail : Failing row contains (null, 04-04-2016, dd@mail.com, dd, $2a$10$FXBRGcoZ3uFAD649LDgfMucLXveFDAF1NyrlCvdY6gjpUgpa/gfkO, dd, client, 1234567890, dd).
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2103)
    at org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1836)
    at org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:512)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:388)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.executeUpdate(AbstractJdbc2Statement.java:334)
    at org.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105)
    at org.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:105)
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:208)
    ... 84 more

my classe client.java

   package com.binov.webservice.web;
import flexjson.JSONDeserializer;
import flexjson.JSONSerializer;

import java.util.Collection;
import java.util.List;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.EntityManager;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.PersistenceContext;
import javax.persistence.Table;

import org.apache.commons.lang3.builder.ReflectionToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
import org.springframework.beans.factory.annotation.Configurable;
import org.springframework.transaction.annotation.Transactional;



@Entity
@Table(schema = "public",name = "client")
@Configurable
public class Client {

    @Column(name = "datenaissance", length = 255)
    private String datenaissance;

    @Column(name = "email", length = 255)
    private String email;

    @Column(name = "nom", length = 255)
    private String nom;

    @Column(name = "password", length = 255)
    private String password;

    @Column(name = "prenom", length = 255)
    private String prenom;

    @Column(name = "role", length = 255)
    private String role;

    @Column(name = "telephone", length = 255)
    private String telephone;

    @Column(name = "username", length = 255)
    private String username;

    public String getDatenaissance() {
        return datenaissance;
    }

    public void setDatenaissance(String datenaissance) {
        this.datenaissance = datenaissance;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getNom() {
        return nom;
    }

    public void setNom(String nom) {
        this.nom = nom;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getPrenom() {
        return prenom;
    }

    public void setPrenom(String prenom) {
        this.prenom = prenom;
    }

    public String getRole() {
        return role;
    }

    public void setRole(String role) {
        this.role = role;
    }

    public String getTelephone() {
        return telephone;
    }

    public void setTelephone(String telephone) {
        this.telephone = telephone;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "idclient")
    private Integer idclient;

    public Integer getIdclient() {
        return this.idclient;
    }

    public void setIdclient(Integer id) {
        this.idclient = id;
    }

    @PersistenceContext
    transient EntityManager entityManager;

    public static final List<String> fieldNames4OrderClauseFilter = java.util.Arrays.asList("");

    public static final EntityManager entityManager() {
        EntityManager em = new Client().entityManager;
        if (em == null) throw new IllegalStateException("Entity manager has not been injected (is the Spring Aspects JAR configured as an AJC/AJDT aspects library?)");
        return em;
    }

    public String toJson() {
        return new JSONSerializer()
        .exclude("*.class").serialize(this);
    }

    public String toJson(String[] fields) {
        return new JSONSerializer()
        .include(fields).exclude("*.class").serialize(this);
    }

    public static Client fromJsonToClient(String json) {
        return new JSONDeserializer<Client>()
        .use(null, Client.class).deserialize(json);
    }

    public static String toJsonArray(Collection<Client> collection) {
        return new JSONSerializer()
        .exclude("*.class").serialize(collection);
    }

    public static String toJsonArray(Collection<Client> collection, String[] fields) {
        return new JSONSerializer()
        .include(fields).exclude("*.class").serialize(collection);
    }

    public static Collection<Client> fromJsonArrayToClients(String json) {
        return new JSONDeserializer<List<Client>>()
        .use("values", Client.class).deserialize(json);
    }




    public static long countClients() {
        return entityManager().createQuery("SELECT COUNT(o) FROM Client o", Long.class).getSingleResult();
    }

    public static List<Client> findAllClients() {
        return entityManager().createQuery("SELECT o FROM Client o", Client.class).getResultList();
    }

    public static List<Client> findAllClients(String sortFieldName, String sortOrder) {
        String jpaQuery = "SELECT o FROM Client o";
        if (fieldNames4OrderClauseFilter.contains(sortFieldName)) {
            jpaQuery = jpaQuery + " ORDER BY " + sortFieldName;
            if ("ASC".equalsIgnoreCase(sortOrder) || "DESC".equalsIgnoreCase(sortOrder)) {
                jpaQuery = jpaQuery + " " + sortOrder;
            }
        }
        return entityManager().createQuery(jpaQuery, Client.class).getResultList();
    }

    // find a client with her username and password

//      public static List<Client> findClientByUsernamePassword(String username,String password)
//      {
//          // TODO Auto-generated method stub
//          if((username==null) && (password==null))return null;

//      return entityManager().createQuery("SELECT o FROM Client o where o.username=:username and o.password=:password", Client.class).setParameter("username", username).setParameter("password", password).getSingleResult();
//      }

        //find a cient by username  
        public static List<Client> findClientByUsernamePassword(String username)
        {
            // TODO Auto-generated method stub
            if((username==null))return null;
            return (List<Client>) entityManager().createQuery("SELECT o FROM Client o WHERE o.username=:username",Client.class).setParameter("username", username).getResultList(); 

        }


        public static List<Client> findClientByUsernamePassword(String username2,String password2) {
            // TODO Auto-generated method stub
            return entityManager().createQuery("SELECT o FROM Client o where o.username=:username and o.password=:password", Client.class).setParameter("username", username2).setParameter("password", password2).getResultList();
        }





    public static Client findClient(Integer idclient) {
        if (idclient == null) return null;
        return entityManager().find(Client.class, idclient);
    }

    public static List<Client> findClientEntries(int firstResult, int maxResults) {
        return entityManager().createQuery("SELECT o FROM Client o", Client.class).setFirstResult(firstResult).setMaxResults(maxResults).getResultList();
    }

    public static List<Client> findClientEntries(int firstResult, int maxResults, String sortFieldName, String sortOrder) {
        String jpaQuery = "SELECT o FROM Client o";
        if (fieldNames4OrderClauseFilter.contains(sortFieldName)) {
            jpaQuery = jpaQuery + " ORDER BY " + sortFieldName;
            if ("ASC".equalsIgnoreCase(sortOrder) || "DESC".equalsIgnoreCase(sortOrder)) {
                jpaQuery = jpaQuery + " " + sortOrder;
            }
        }
        return entityManager().createQuery(jpaQuery, Client.class).setFirstResult(firstResult).setMaxResults(maxResults).getResultList();
    }

    @Transactional
    public void persist() {
        if (this.entityManager == null) this.entityManager = entityManager();
        this.entityManager.persist(this);
    }

    @Transactional
    public void remove() {
        if (this.entityManager == null) this.entityManager = entityManager();
        if (this.entityManager.contains(this)) {
            this.entityManager.remove(this);
        } else {
            Client attached = Client.findClient(this.idclient);
            this.entityManager.remove(attached);
        }
    }

    @Transactional
    public void flush() {
        if (this.entityManager == null) this.entityManager = entityManager();
        this.entityManager.flush();
    }

    @Transactional
    public void clear() {
        if (this.entityManager == null) this.entityManager = entityManager();
        this.entityManager.clear();
    }

    @Transactional
    public Client merge() {
        if (this.entityManager == null) this.entityManager = entityManager();
        Client merged = this.entityManager.merge(this);
        this.entityManager.flush();
        return merged;
    }

//  public String toString() {
//        return ReflectionToStringBuilder.toString(this, ToStringStyle.SHORT_PREFIX_STYLE);
//    }

    public String toString() {
        return new ReflectionToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE).setExcludeFieldNames("Client").toString();
    }


}

拜托，我该如何解决这个问题？