Spring 如何创建MongoOperations Bean？

我正在尝试制作一个MongoOperations Bean，但无法使其运行。我有几个类将连接到数据库，我不想在每个数据库连接中添加以下代码

ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringMongoConfig2.class);
MongoOperations mongoOperation = (MongoOperations) ctx.getBean("mongoTemplate");

上述代码有效

我正在创建一个RESTWeb服务，我有几个类，每个类都需要写入MongoDb.Collection

我已经设置了一个Bean配置文件：

@Configuration
public class SpringMongoConfig2 {

    @Bean
    public MongoDbFactory mongoDbFactory2() throws Exception {
        return new SimpleMongoDbFactory(new MongoClient(), "myDatabase");
    }

    @Bean
    public MongoTemplate mongoTemplate2() throws Exception {

        MongoTemplate mongoTemplate = new MongoTemplate(mongoDbFactory2());

        return mongoTemplate;       
    }

    @Bean
    public MongoOperations mongoOperations2() throws Exception  {
        return mongoTemplate2();
    }

然后在InMongodBOperations类中，我尝试像这样自动连接它：

@Autowire MongoOperations mongoOperations2;

mongoOperations2.findAll(MongoLicense.class);

我的错误是它不能创建bean。有人能看出我做错了什么吗

下面是堆栈跟踪：

type Exception report

message Request processing failed; nested exception is java.lang.NullPointerException

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.NullPointerException
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:943)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:822)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
    no.nlf.rest.CorsFilter.doFilter(CorsFilter.java:27)
root cause

java.lang.NullPointerException
    no.nlf.dal.LicenseController.getAllLicenses(LicenseController.java:30)
    no.nlf.logic.LicenseLogic.getAllLicenses(LicenseLogic.java:18)
    no.nlf.rest.RestLicense.licenseList(RestLicense.java:26)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214)
    org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:748)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:822)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:807)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
    no.nlf.rest.CorsFilter.doFilter(CorsFilter.java:27)

---

在spring应用程序上下文中

<mongo:db-factory id="mongoDbFactory" host="db" port="27017" dbname="dbname" />


<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
    <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
</bean>

---

请发布堆栈跟踪显示，请说明您的

restclicense

、

LicenseLogic

和

LicenseController

是如何连接的。它们都是春豆吗？如何启动SpringWebCTX？您真的确定

SpringMongoConfig2

对web ctx是可访问的吗？它与其他类Restlicense og LicenseLogic无关。这一切都在LicenseController中。如果像我在开始时写的那样使用applicationContext.getBean（），效果很好，但是我有几个类将连接到数据库，并且我无法为每个类创建新的应用程序上下文。

@Autowired
MongoTemplate mt;