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当我在控制器文件中运行这部分 (@RequestMapping("/SearchStaff")) 时，就会出现问题。我可以成功显示我的搜索表单（SearchStaff 下面的请求映射）。

这个问题似乎与 Hibernate 没有任何关系。正如我评论过 Hibernate 的东西，但我仍然明白。

如果我注释掉这一行

message = staffDAO.searchForStaff(search);

在我的控制器文件中，它通过了。但我认为 searchForStaff 函数没有任何问题。这是一个非常简单的函数，只返回字符串“test”并运行 system.out.println(“test”)。

你能帮忙吗？谢谢

但这是我得到的错误：

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:894)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

root cause

java.lang.NullPointerException
    org.flinders.staffdirectory.controllers.SearchController.showSearchResults(SearchController.java:25)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:601)
    org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:219)
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:100)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:604)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:565)
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

我的 spring-servlet xml

<?xml version="1.0" encoding="UTF-8"?>
<beans
    xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <context:component-scan base-package="org.flinders.staffdirectory.controllers" />

    <mvc:annotation-driven />
    <mvc:resources mapping="/resources/**" location="/resources/" />

    <tx:annotation-driven />

    <bean
        id="propertyConfigurer"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"
        p:location="/WEB-INF/spring.properties" />
    <bean
        id="dataSource"
        class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"
        p:driverClassName="${jdbc.driverClassName}"
        p:url="${jdbc.databaseurl}"
        p:username="${jdbc.username}"
        p:password="${jdbc.password}" />
    <bean
        id="sessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"
        p:dataSource-ref="dataSource"
        p:configLocation="${hibernate.config}"
        p:packagesToScan="org.flinders.staffdirectory"/>
    <bean
        id="transactionManager"
        class="org.springframework.orm.hibernate4.HibernateTransactionManager"
        p:sessionFactory-ref="sessionFactory" />

    <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver"
        p:viewClass="org.springframework.web.servlet.view.tiles2.TilesView" />
    <bean id="tilesConfigurer" class="org.springframework.web.servlet.view.tiles2.TilesConfigurer"
        p:definitions="/WEB-INF/tiles.xml" />

    <bean
        id="staffDAO"
        class="org.flinders.staffdirectory.dao.StaffDAO"
        p:sessionFactory-ref="sessionFactory" />
    <!-- <bean
        id="staffService"
        class="org.flinders.staffdirectory.services.StaffServiceImpl"
        p:staffDAO-ref="staffDAO" />-->
</beans>

这是我的控制器文件

package org.flinders.staffdirectory.controllers;

import java.util.List;

//import org.flinders.staffdirectory.models.database.SearchResult;
import org.flinders.staffdirectory.models.misc.Search;
import org.flinders.staffdirectory.dao.StaffDAO;

//import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class SearchController {
    //@Autowired
    private StaffDAO staffDAO;
    private String message;

    @RequestMapping("/SearchStaff")
    public ModelAndView showSearchResults(@ModelAttribute Search search) {

        //List<SearchResult> searchResults =
        message = staffDAO.searchForStaff(search);

        //System.out.println(search.getSurname());
        return new ModelAndView("search/SearchForm", "Search", new Search());
        //return new ModelAndView("search/SearchResults", "searchResults", searchResults);
    }

    @RequestMapping("/SearchForm")
    public ModelAndView showSearchForm() {
        return new ModelAndView("search/SearchForm", "search", new Search());
    }
}

我的道课

package org.flinders.staffdirectory.dao;

import java.util.List;

import org.hibernate.SessionFactory;

//import org.springframework.beans.factory.annotation.Autowired;

import org.flinders.staffdirectory.models.database.SearchResult;
import org.flinders.staffdirectory.models.misc.Search;

public class StaffDAO {
    //@Autowired
    private SessionFactory sessionFactory;

    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }

    public String searchForStaff(Search search) {
        /*String SQL = "select distinct telsumm_id as id, telsumm_parent_id as parentId, telsumm_name_title as title, (case when substr(telsumm_surname, length(telsumm_surname) - 1, 1) = ',' then substr(telsumm_surname, 1, length(telsumm_surname) - 1) else telsumm_surname end) as surname, telsumm_preferred_name as firstname, nvl(telsumm_tele_number, '-') as telephoneNumber, nvl(telsumm_role, '-') as role, telsumm_display_department as department, lower(telsumm_entity_type) as entityType from teldirt.teld_summary where (telsumm_search_surname is not null) and not (nvl(telsumm_tele_directory,'xxx') IN ('N','S','D')) and not (telsumm_tele_number IS NULL AND telsumm_alias IS NULL) and (telsumm_alias_list = 'Y' OR (telsumm_tele_directory IN ('A','B'))) and ((nvl(telsumm_system_id_end,sysdate+1) > SYSDATE and telsumm_entity_type = 'P') or (telsumm_entity_type = 'N')) and (telsumm_search_department NOT like 'SPONSOR%')";

        if (search.getSurname().length() > 0) {
            SQL += " and (telsumm_search_surname like '" + search.getSurname().toUpperCase() + "%')";
        }
        if (search.getSurnameLike().length() > 0) {
            SQL += " and (telsumm_search_soundex like soundex(('%" + search.getSurnameLike().toUpperCase() + "%'))";
        }
        if (search.getFirstname().length() > 0) {
            SQL += " and (telsumm_search_preferred_name like '" + search.getFirstname().toUpperCase() + "%' or telsumm_search_first_name like '" + search.getFirstname() + "%')";
        }
        if (search.getTelephoneNumber().length() > 0) {
            SQL += " and (telsumm_tele_number like '" + search.getTelephoneNumber() + "%')";
        }
        if (search.getDepartment().length() > 0) {
            SQL += " and (telsumm_search_department like '" + search.getDepartment().toUpperCase() + "%')";
        }
        if (search.getRole().length() > 0) {
            SQL += " and (telsumm_search_role like '" + search.getRole().toUpperCase() + "%')";
        }
        SQL += " order by surname, firstname";

        List<Object[]> list = (List<Object[]>) sessionFactory.getCurrentSession().createQuery(SQL).list();

        for(int j=0;j<list.size();j++){
            Object [] obj= (Object[])list.get(j);
            for(int i=0;i<obj.length;i++)
                System.out.println(obj[i]);
        }*/
                System.out.println("test");
             return "test";
    }
}

我的 pom.xml

<project
    xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>org.flinders.staffdirectory</groupId>

    <artifactId>directory-maven</artifactId>

    <packaging>war</packaging>

    <version>0.0.1-SNAPSHOT</version>

    <name>directory-maven Maven Webapp</name>

    <url>http://maven.apache.org</url>

    <properties>
        <org.springframework.version>3.1.3.RELEASE</org.springframework.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>4.1.8.Final</version>
        </dependency>

        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <dependency>
            <groupId>com.oracle</groupId>
            <artifactId>ojdbc6</artifactId>
            <version>11.2.0.3</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.5.8</version>
        </dependency>

        <dependency>
            <groupId>org.apache.tiles</groupId>
            <artifactId>tiles-jsp</artifactId>
            <version>2.2.2</version>
        </dependency>

        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>directory-maven</finalName>
    </build>
</project>
4

1 回答 1

1

StaffDAO 为 null 。您注释掉其自动装配的任何原因。

我还看到private SessionFactory sessionFactory;Autowired 也被评论了。请尝试删除这些评论。

//@Autowired

于 2012-12-06T05:13:21.857 回答