Spring和PostgreSQL引發java.lang.NullPointerException

我使用Spring，Hibernate和PostgreSQL。我想將對象保存在來自jsp頁面的數據庫中。但它會拋出NullPointerException。我使用序列發生器進行自動增量，並在PostgreSQL中創建了一個名爲emp_id_seq的序列。我打印對象發現問題，那就說明Spring和PostgreSQL引發java.lang.NullPointerException

Employee [id=null, firstName=vara, lastName=raj, address=abc, dob=Tue Jun 13 00:00:00 IST 2017, nic=154184125V, [email protected], companyId=1, departmentId=4]

錯誤

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982) 
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:661) 
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742) 
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
Root Cause 

java.lang.NullPointerException 
    org.postgresql.core.CachedQueryCreateAction.create(CachedQueryCreateAction.java:39) 
    org.postgresql.core.CachedQueryCreateAction.create(CachedQueryCreateAction.java:17) 
    org.postgresql.util.LruCache.borrow(LruCache.java:115) 
    org.postgresql.core.QueryExecutorBase.borrowQuery(QueryExecutorBase.java:266) 
    org.postgresql.jdbc.PgConnection.borrowQuery(PgConnection.java:143) 
    org.postgresql.jdbc.PgPreparedStatement.<init>(PgPreparedStatement.java:88) 
    org.postgresql.jdbc.PgConnection.prepareStatement(PgConnection.java:1256) 
    org.postgresql.jdbc.PgConnection.prepareStatement(PgConnection.java:1622) 
    org.postgresql.jdbc.PgConnection.prepareStatement(PgConnection.java:415) 
    org.apache.commons.dbcp2.DelegatingConnection.prepareStatement(DelegatingConnection.java:293) 
    org.apache.commons.dbcp2.DelegatingConnection.prepareStatement(DelegatingConnection.java:293) 
    org.hibernate.engine.jdbc.internal.StatementPreparerImpl$1.doPrepare(StatementPreparerImpl.java:87) 
    org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:172) 
    org.hibernate.engine.jdbc.internal.StatementPreparerImpl.prepareStatement(StatementPreparerImpl.java:72) 
    org.hibernate.id.SequenceGenerator.generateHolder(SequenceGenerator.java:114) 
    org.hibernate.id.SequenceHiLoGenerator.generate(SequenceHiLoGenerator.java:62) 
    org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:101) 
    org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192) 
    org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177) 
    org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:97) 
    org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73) 
    org.hibernate.internal.SessionImpl.fireSaveOrUpdate(SessionImpl.java:648) 
    org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:640) 
    org.hibernate.internal.SessionImpl.saveOrUpdate(SessionImpl.java:635) 
    com.pulseBeatMaster.dao.impl.EmployeeDaoImpl.saveOrUpdate(EmployeeDaoImpl.java:43) 
    com.pulseBeatMaster.dao.impl.EmployeeDaoImpl$$FastClassBySpringCGLIB$$dadeda1c.invoke(<generated>) 
    org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) 
    org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:738) 
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) 
    org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136) 
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:673) 
    com.pulseBeatMaster.dao.impl.EmployeeDaoImpl$$EnhancerBySpringCGLIB$$a0d1e9e8.saveOrUpdate(<generated>) 
    com.pulseBeatMaster.service.impl.EmployeeServiceImpl.saveOrUpdate(EmployeeServiceImpl.java:34) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    java.lang.reflect.Method.invoke(Method.java:498) 
    org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) 
    org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) 
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) 
    org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) 
    org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282) 
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) 
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) 
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) 
    com.sun.proxy.$Proxy64.saveOrUpdate(Unknown Source) 
    com.pulseBeatMaster.controller.EmployeeController.saveUser(EmployeeController.java:60) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    java.lang.reflect.Method.invoke(Method.java:498) 
    org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) 
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) 
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97) 
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) 
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) 
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) 
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) 
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) 
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) 
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:661) 
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) 
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742) 
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

Model類

@Entity 
@Table(name = "employee", schema = "schpulsebeat") 
public class Employee { 
    private Integer id; 
    private String firstName; 
    private String lastName; 
    private String address; 
    private Date dob; 
    private String nic; 
    private String email; 
    private Integer companyId; 
    private Integer departmentId; 

    public Employee() { 
     super(); 
    } 

    public Employee(Integer id, String firstName, String lastName, String address, Date dob, String nic, String email, 
      Integer companyId, Integer departmentId) { 
     super(); 
     this.id = id; 
     this.firstName = firstName; 
     this.lastName = lastName; 
     this.address = address; 
     this.dob = dob; 
     this.nic = nic; 
     this.email = email; 
     this.companyId = companyId; 
     this.departmentId = departmentId; 
    } 

     @Id 

//schpulsebeat is a schema. employee_id_seq is created as sequence in postgresql. 
     @SequenceGenerator(name="employee_id_seq",sequenceName="schpulsebeat.employee_id_seq",allocationSize=1) 
     @GeneratedValue(strategy=GenerationType.SEQUENCE,generator="employee_id_seq") 
     @Column(name="employee_id") 
     public Integer getId() { 
      return id; 
     } 

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

    @Column(name="first_name") 
    public String getFirstName() { 
     return firstName; 
    } 

    public void setFirstName(String firstName) { 
     this.firstName = firstName; 
    } 

    @Column(name="last_name") 
    public String getLastName() { 
     return lastName; 
    } 

    public void setLastName(String lastName) { 
     this.lastName = lastName; 
    } 

    @Column(name="address") 
    public String getAddress() { 
     return address; 
    } 

    public void setAddress(String address) { 
     this.address = address; 
    } 

    @Column(name="dob") 
    @DateTimeFormat(pattern = "yyyy-MM-dd") 
    public Date getDob() { 
     return dob; 
    } 

    public void setDob(Date dob) { 
     this.dob = dob; 
    } 

    @Column(name="nic") 
    public String getNic() { 
     return nic; 
    } 

    public void setNic(String nic) { 
     this.nic = nic; 
    } 

    @Column(name="email") 
    public String getEmail() { 
     return email; 
    } 

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

    @Column(name="company_id", nullable=true) 
    public Integer getCompanyId() { 
     return companyId; 
    } 

    public void setCompanyId(Integer companyId) { 
     this.companyId = companyId; 
    } 

    @Column(name="department_id", nullable=true) 
    public Integer getDepartmentId() { 
     return departmentId; 
    } 

    public void setDepartmentId(Integer departmentId) { 
     this.departmentId = departmentId; 
    } 

    @Override 
    public String toString() { 
     return "Employee [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", address=" + address 
       + ", dob=" + dob + ", nic=" + nic + ", email=" + email + ", companyId=" + companyId + ", departmentId=" 
       + departmentId + "]"; 
    } 



}

控制器

@RequestMapping(value = "/saveEmployee", method = RequestMethod.POST) 
    public ModelAndView saveUser(@ModelAttribute("employeeForm") Employee employee) { 

     //System.out.println("object data"+employee.toString()); 
     employeeService.saveOrUpdate(employee); 
     return new ModelAndView("redirect:/"); 
    }

jsp頁面（除去容易性所有的CSS樣式）

<spring:url value="/saveEmployee" var="saveURL"></spring:url> 


<form:form action="${saveURL}" method="POST" modelAttribute="employeeForm"> 

    <form:hidden path="id" /> 


     <form:select class="form-control" name="companyId"> 
      <form:option value="1">Lunah Labs</option> 
      <form:option value="2">XYZ conf</option> 
      <form:option value="3">New Tech Lead</option> 
      <form:option value="4">FINWIN</option> 
     </form:select> 


     <form:select class="form-control" name="departmentId"> 
      <form:option value="4">CIS</option> 
      <form:option value="5">Tech</option> 
      <form:option value="6">Electronic</option> 
      <form:option value="7">Event</option> 
     </form:select> 

     <form:input path="firstName"/> 

     <form:input path="lastName" /> 

     <form:input path="address" /> 

     <form:input path="dob" type="date" /> 

     <form:input path="nic" /> 

     <form:input path="email" /> 

     <button type="submit" >Submit</button> 

</form:form>

林去擔心

1）DOB字段

2）ID，其是生成

來源

2017-06-12 varman

您使用哪種posdb jdbc驅動程序版本？ –

IM使用' \t \t org.springframework.boot \t \t 彈簧引導啓動父 \t \t 1.5.3.RELEASE \t'所以它定義了最新版本@BohdanLevchenko – varman

-1

請給出EmployeeDaoImpl.java類的剩餘代碼。行號43上的EmployeeDaoImpl.java類發生主要異常。

來源

2017-06-12 18:04:02 Sharma

這是代碼，顯示'public void saveOrUpdate（Employee employee）{}} saveOrUpdate（employee）;}} \t} ' – varman

Spring和PostgreSQL引發java.lang.NullPointerException

回答

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