How can I create a MongoOperations Bean? - spring

Question

I'm trying to make a MongoOperations Bean, but can't get it to work. I have several classes that will connect to a database, and I don't want to add the following code to every connection to the database.
ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringMongoConfig2.class);
MongoOperations mongoOperation = (MongoOperations) ctx.getBean("mongoTemplate");
The above code works..
I'm making a REST web service, and I have several classes that each need to write to a MongoDb.Collection.
I have set up a Bean configuration file:
#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();
}
And then in the in mongodboperations class I try to Autowire it like this:
#Autowire MongoOperations mongoOperations2;
mongoOperations2.findAll(MongoLicense.class);
My error is that it cant create the bean. Can anyone see what I'm doing wrong?
Below is stack trace:
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)

Answer 1

in spring application context
<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>
and then in your classes
#Autowired
MongoTemplate mt;