Spring不会读取applicationContext.xml文件

Question

I've been reading a ton of examples in StackOverflow on the subject of ApplicationContextProvider, but I can't find a single one that addresses my problem. I have an xml file that I don't believe is being read in and initializing the beans that I note in it. I have the following class:

package com.tacticalenterprisesltd.spring;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class ApplicationContextProvider implements ApplicationContextAware
{
    @Autowired
    private static ApplicationContext context;

    public ApplicationContext getApplicationContext()
    {
        return context;
    }

    @Override
    public void setApplicationContext(ApplicationContext ac) throws BeansException {
        System.out.println("ApplicationContext Initialized");
        context = ac;
    }       
}

My applicationContext.xml file:

<?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:p="http://www.springframework.org/schema/p"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:task="http://www.springframework.org/schema/task" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.2.xsd">

    <mvc:annotation-driven />
    <tx:annotation-driven />
    <context:component-scan base-package="com.tacticalenterprisesltd" />
    <bean id="applicationContextProvider" class="com.tacticalenterprisesltd.spring.ApplicationContextProvider" />
    <bean id="springDatabase" class="com.tacticalenterprisesltd.spring.SpringDatabase" />

</beans>

JedSpringTestApplication:

package com.tacticalenterprisesltd.jedspringtest;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@ComponentScan(basePackages = {"com.tacticalenterprisesltd"})
public class JedSpringTestApplication {

    public static void main(String[] args) {
        SpringApplication.run(JedSpringTestApplication.class, args);

    }
}

and finally, PersonelSearch class:

package com.tacticalenterprisesltd.jedspringtest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import com.tacticalenterprisesltd.Field;
import com.tacticalenterprisesltd.Query;
import com.tacticalenterprisesltd.WhereCondition;
import com.tacticalenterprisesltd.spring.ApplicationContextProvider;
import com.tacticalenterprisesltd.spring.SpringDatabase;

@Controller
public class PersonnelSearch 
{
    @Autowired
    ApplicationContextProvider applicationContextProvider ;

    @RequestMapping("/search")
    public String search(@RequestParam(value="lastname", required=true) String lastname, Model model) {
        model.addAttribute("lastname", lastname);
        SpringDatabase sd = (SpringDatabase)applicationContextProvider .getApplicationContext().getBean("springDatabase", com.tacticalenterprisesltd.spring.SpringDatabase.class);
        Query query = new Query(Query.Type.SELECT, "employees");
        Field field1 = new Field("employees", "id", Field.Type.INT);
        Field field2 = new Field("employees", "first_name", Field.Type.STRING);
        Field field3 = new Field("employees", "last_name", Field.Type.INT);
        Field field4 = new Field("employees", "email", Field.Type.INT);
        Field[] fields = new Field[4];
        fields[0] = field1;
        fields[1] = field2;
        fields[2] = field3;
        fields[3] = field4;
        query.setFields(fields);
        WhereCondition where = new WhereCondition(field3, lastname, "=");
        WhereCondition[] conditions = new WhereCondition[1];
        conditions[0] = where;
        query.setWhereConditions(conditions);
        sd.setQuery(query);
        String[][] strData = sd.executeSelect();
        String out = "";
        for(int i = 0; i < strData.length; i++)
        {
            out += " | ";
            for(int j = 0; j < strData[0].length; j++)
            {
                out += strData[i][j] + " | ";
            }
            out += "\n";
        }
        System.out.println("Table Results:\n" + out);
        return out;
    }
}

When I run this as a Spring Boot application I get:

Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'personnelSearch': Unsatisfied dependency expressed through field 'applicationContextProvider'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.tacticalenterprisesltd.spring.ApplicationContextProvider' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
***************************
APPLICATION FAILED TO START
***************************

    Description:

Field applicationContextProvider in com.tacticalenterprisesltd.jedspringtest.PersonnelSearch required a bean of type 'com.tacticalenterprisesltd.spring.ApplicationContextProvider' that could not be found.


Action:

Consider defining a bean of type 'com.tacticalenterprisesltd.spring.ApplicationContextProvider' in your configuration.

I'm thinking that the applicationContext.xml file is not being read in, otherwise the beans that are noted inside it would be available when the application loads. Please advise.

Answer 1

You haven't @Autowired your Application context.

You need to do it like this:

@Component
public class ApplicationContextProvider
{
    @Autowired
    private ApplicationContext context;

    public ApplicationContext getApplicationContext()
    {
        return context;
    }

}

Answer 2

Either change the name of the variable from acp to applicationContextProvider in the PersonnelSearch class OR add @Qualifier("applicationContextProvider") after @Autowired in PersonnelSearch for acp variable.

eg

@Controller
public class PersonnelSearch 
{
    @Autowired
    ApplicationContextProvider applicationContextProvider;

OR

@Controller
public class PersonnelSearch 
    {
        @Autowired
        @Qualifier("applicationContextProvider")
        ApplicationContextProvider acp;

Also, add @ComponentScan(basePackages = {"com.tacticalenterprisesltd"}) on JedSpringTestApplication as:

package com.tacticalenterprisesltd.jedspringtest;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@ComponentScan(basePackages = {"com.tacticalenterprisesltd"})
public class JedSpringTestApplication {

    public static void main(String[] args) {
        SpringApplication.run(JedSpringTestApplication.class, args);

    }
}