那些遇到过的问题

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 for OneToOne annotation

spl*_*dli -1 java hibernate

我做了一个登录jsp，我正在使用Hibernate OneToOne注释，对于useradmin和wafat，如果wafat中有PK（useradmin）记录，则类useradmin用于登录很好，但是当wafat中没有PK（useradmin）记录时，我得到了这个错误~ java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

这是我的ERD~

在此处输入图片说明

这是来自wafat表的记录，

在此处输入图片说明

这是来自用户表的记录，

在此处输入图片说明

这是 useradmin 类，

package org.ppbni.splatter.model;

import java.io.Serializable;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Entity;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.OneToOne;
import javax.persistence.CascadeType;

@SuppressWarnings("serial")
@Entity
@Table(name="user")
public class UserAdmin implements Serializable{

@Id
@GeneratedValue
@Column(name="no_dana", unique=true, nullable=false)
private String no_dana;

@Column(name="npp")
private String npp;

@Column(name="password")
private String password;

@OneToOne(mappedBy="useradmin", cascade=CascadeType.ALL)
@PrimaryKeyJoinColumn
private Wafat wafat;

/**Setter and Getter Methods**/

}
Run Code Online (Sandbox Code Playgroud)

这是我的wafat课，

package org.ppbni.splatter.model;

import java.io.Serializable;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Id;
import javax.persistence.Entity;
import javax.persistence.JoinColumn;
import javax.persistence.MapsId;
import javax.persistence.OneToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

@SuppressWarnings("serial")
@Entity
@Table(name="wafat")
public class Wafat implements Serializable{

@Id
@Column(name="kode_wafat", unique=true, nullable=false)
private String kode_wafat;

@Id
@JoinColumn(name="no_dana")
private String no_dana;

@Temporal(TemporalType.TIMESTAMP)
@Column(name="tgl_wafat")

@Column(name="usia_wafat")
private Date tgl_wafat;

@Column(name="usia_wafat")
private int usia_wafat;

@Temporal(TemporalType.TIMESTAMP)
@Column(name="tgl_makam")
private Date tgl_makam;

@Column(name="tempat_makam")
private String tempat_makam;

@OneToOne
@MapsId
@JoinColumn(name="no_dana")
private UserAdmin useradmin;

/**Setter and Getter Methods**/
}
Run Code Online (Sandbox Code Playgroud)

这是 ny 登录控制器，

@RequestMapping(value="/afterlogin.html", method = RequestMethod.GET)
public String directIndex(ModelMap model) {
    User user = (User)SecurityContextHolder.getContext().getAuthentication().getPrincipal();
    String sessionUser = user.getUsername();

    try {
        UserAdmin dataUser = userService.get(sessionUser);
        String userAuth = dataUser.getAuthority();
        System.out.println(userAuth);
        if(userAuth.equals("ROLE_ANGGOTA") || userAuth.equals("ROLE_PENGURUS")){
            return "redirect:/user/index.html";
        }
        else if(userAuth.equals("ROLE_ADMIN")){
            return "redirect:/admin/index.html";
        }
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    return null;
}
Run Code Online (Sandbox Code Playgroud)

这是错误~ 

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at org.ppbni.splatter.dao.impl.UserDaoImpl.get(UserDaoImpl.java:33)
at org.ppbni.splatter.service.impl.UserServiceImpl.get(UserServiceImpl.java:21)
at org.ppbni.splatter.web.controller.LoginController.directIndex(LoginController.java:39)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
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.doGet(FrameworkServlet.java:827)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:183)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Run Code Online (Sandbox Code Playgroud)

这是我的道的一部分，

@SuppressWarnings("unchecked")
@Override
public UserAdmin get(String no_dana)throws Exception{

    DetachedCriteria criteria = DetachedCriteria.forClass(UserAdmin.class).add(Restrictions.eq("no_dana", no_dana));
    List<UserAdmin> userList = getHibernateTemplate().findByCriteria(criteria);
    return userList.get(0);

}
Run Code Online (Sandbox Code Playgroud)

任何帮助都会很高兴:)

Tho*_*mas 5

由于您正在添加Restrictions.eq("no_dana", no_dana)您的标准，因此没有用户匹配该限制。因此，调用userList.get(0)将导致上述异常：这意味着您尝试访问零索引（大小 0）中的第一个索引 (0)，这显然无法正常工作。

要解决这个问题，您需要检查userList例如 viauserList.isEmpty()或的大小userList.size() > 0。

如果没有用户，你会做什么取决于你的应用程序的其余部分：

  • 您可以返回，null在这种情况下，这意味着尚未找到该用户，您需要采取相应措施
  • 您可以直接抛出异常，最好是一些命名异常UserNotFoundException等，然后您可以在调用者中处理该异常或将其一直传递给控制器​​并向用户显示适当的消息
  • 创建一个新用户（可能不会，您肯定希望控制创建哪些用户以及何时创建）
  • 做其他事情（任何适合您的情况）

更新

看来你的映射是错误的。从编辑它看起来像UserAdmin并且Wafat应该使用no_dana. 因此，我建议作为连接列Wafat成为关系的拥有方no_dana。这意味着wafatinUserAdmin应该用@OneToOne(mappedBy="useradmin", cascade=CascadeType.ALL). 如果可以有没有 wafat 的用户，您可能还想添加optional=true。

这样，当没有Wafat引用UserAdmin实例wafat时，加载该字段时该字段应为空UserAdmin。

顺便说一句，@PrimaryKeyJoinColumn应该删除。

归档时间：

查看次数：

9338 次

最近记录：

9 年，10 月 前
相关归档
为什么java.io.File没有close()方法？ 113
如何从Java中的索引获取枚举值？ 90
什么是最有用和最完整的Java备忘单？ 86
Hibernate条件:没有映射关联的连接表 69
我应该使用java.util.Date还是切换到java.time.LocalDate 50
通过反射访问字段xxx以获取持久属性时出错 6
GlassFishV3 Hibernate库问题 5
我可以在我的应用程序中使用不同的文件名而不是hibernate.cfg.xml 3
HQL多对多查询 3
通过JPA在一个Java对象中联接两个表 3
难疑归档
使用'for'循环迭代字典 2901
需要一个没有任何子弹的无序列表 2408
深度克隆对象 2135
如何在不手动指定编码的情况下在C#中获得字符串的一致字节表示？ 2121
如何将package.json中的每个依赖项更新为最新版本？ 1871
打印Java数组最简单的方法是什么？ 1852
Apache Camel究竟是什么？ 1310
如何克隆仅Git存储库的子目录？ 1298
如何使用sed替换换行符(\n)？ 1295
从JS数组中删除重复值 1225