I'm rather new to Spring and I'm working with an old 3.2.4.RELEASE version of it inside a Jetty container. I'm getting a rather odd error when I try to use component-scanner indicating that the #Configuration class I've set up is not an enhanced class:
Caused by: java.lang.IllegalArgumentException: class com.datasource.DBConfiguration$$EnhancerByCGLIB$$8a295c55 is not an enhanced class
at org.springframework.cglib.proxy.Enhancer.setCallbacksHelper(Enhancer.java:621) ~[spring-core-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.cglib.proxy.Enhancer.registerStaticCallbacks(Enhancer.java:594) ~[spring-core-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer.createClass(ConfigurationClassEnhancer.java:120) ~[spring-context-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer.enhance(ConfigurationClassEnhancer.java:92) ~[spring-context-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:356) ~[spring-context-3.2.4.RELEASE.jar:3.2.4.RELEASE]
... 78 common frames omitted
My spring beans file is on the classpath and looks like the following
<?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"
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-3.2.xsd">
<context:component-scan base-package="com.datasource" /></beans>
The configuration class that I'm trying to setup looks like the following:
#Configuration
public class DBConfiguration {
#Bean
public DataAccessInterface getDataAccessInterface(){
return new DBDatasource();
}
}
The class that I want to inject the DBDatasource into looks like the following:
#Service
public class DBService {
private DataAccessInterface dai;
#Autowired
public DBService(DataAccessInterface dai){
this.dai = dai;
}
}
What does the exception mean when it says that it is not an enhanced class? Am I not using component scan and the configuration annotation properly?
Please include
#ComponentScan(basePackages = "com.example", includeFilters = {#Filter(filterType = ANNOTATION, value = CONFIGURATION)}, excludeFilters = {#Filter(filterType = ASSIGNABLE_TYPE, value = DBConfiguration)})
Related
I have the following 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:context="http://www.springframework.org/schema/context"
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-4.1.xsd">
<bean class="com.app.config.AppConfig"></bean>
</beans>
And the following config class:
package com.app.config;
#Configuration
#ComponentScan("com.app")
public class AppConfig {
// actual beans definition
#Bean
...
#Bean
...
#Bean
...
}
But if I run the app then Spring will not load the AppConfig cause I get NullPointerExceptions on #Autowired dependencies. So it is like Spring doesn't load the JavaConfig #Bean definitions inside the AppConfig class but treats the class as a simple #Component and not a #Configuration component which can in turn contain bean definitions.
Everything works only when I add the <context:component-scan> definition inside the applicationContext.xml instead of the #ComponentScan annotation inside AppConfig, like this:
<?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"
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-4.1.xsd">
<bean class="com.app.config.AppConfig"></bean>
<context:component-scan base-package="com.app" />
</beans>
And AppConfig becomes simply:
package com.app.config;
#Configuration // no more #ComponentScan (it's inside applicationContext.xml)
public class AppConfig {
// actual beans definition
#Bean
...
#Bean
...
#Bean
...
}
Now, why does Spring doesn't see the #Configuration annotation when it loads the AppConfig bean from applicationContext.xml if applicationContext.xml doesn't have <context:component-scan>?
I guess you are missing annotation-config in your xml. Include the below in your appcontext.xml. This is required to process your annotation. Thanks.
<context:annotation-config/>
I receive NullPoin Exception while calling any method of a Spring Bean, as it seems it is not injected in the container. And I can' t understand why.
Th particularity is that the Controller is using JSF and the Beans are Spring Bean: may be is this the problem? Or just configuration mistake?
The (simplified) code and config is:
Context.xml (called from root context)
<?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:aop="http://www.springframework.org/schema/aop"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xmlns:plugin="http://www.springframework.org/schema/plugin"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.0.xsd
http://www.springframework.org/schema/plugin http://www.springframework.org/schema/plugin/spring-plugin.xsd">
<!--===========LANGUAGE_TO_LOCALE SERVICE CONFIG BEGIN===========-->
<bean
id="languagesCountryLocaleHelper"
class="com.i18n.MyControllerHelper"
scope="request" />
</beans>
JSF COntroller:
#RequestScoped
#Named
public class MyController {
#Autowired
private MyControllerHelper helper;
public void doSomething() {
helper.doSomething ();
}
}
MyControllerHelper:
#Component
public class MyControllerHelper {
public void doSomething() {
// do something useful
}
}
So, this is the simplified case.. do you have any idea on where my error can be?
Thank you in advance!
#Autowired
private MyControllerHelper helper = new MyControllerHelper();
change to this
#Autowired
private MyControllerHelper languagesCountryLocaleHelper;
I solved the problem injecting MyControllerHelper through:
helper = AppContext.getBean(MyControllerHelper.class);
After that, the bean is instantiated and injected and at cascade all the other beans after it.
I suppose it was due by the fact as JSF Controller the Controller instance Object was in a different container now automatically aware of Spring Beans.
I have problems with two services that i autowired in a validator class. The services works ok because in my controller are autowired. I've an applicationContext.xml file and MyApp-servlet.xml file. My base package is es.unican.meteo and i have problems with the package es.unican.meteo.validator. The package es.unican.meteo.controller and es.unican.meteo.service can autowire the services properly.
applicationContext.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:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd">
....
some beans
...
</beans>
Myapp-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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">
<!-- Enabling Spring beans auto-discovery -->
<context:component-scan base-package="es.unican.meteo" />
<!-- Enabling Spring MVC configuration through annotations -->
<mvc:annotation-driven />
Class ResetPasswordValidator:
package es.unican.meteo.validator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.Errors;
import org.springframework.validation.Validator;
import es.unican.meteo.model.User;
import es.unican.meteo.service.MessageService;
import es.unican.meteo.service.UserService;
public class ResetPasswordValidation implements Validator{
#Autowired
private UserService userService;
#Autowired
private MessageService messageService;
public boolean supports(Class<?> clazz) {
return User.class.equals(clazz);
}
public void validate(Object target, Errors errors) {
User user = (User)target;
if(userService.getUserByEmail(user.getEmail())==null){
errors.rejectValue("email", messageService.getMessage("app.error.nonexistentemail"));
}
}
}
I can see the controllers, services and autowired elements in the Spring elements. It seems like spring is not detecting the autowired properties in the package validator. Any ideas?
Edit: Log of the ResetPasswordValidation (Autowire fields)
12:48:50,697 DEBUG main support.DefaultListableBeanFactory:217 - Creating shared instance of singleton bean 'resetPasswordValidation'
12:48:50,697 DEBUG main support.DefaultListableBeanFactory:430 - Creating instance of bean 'resetPasswordValidation'
12:48:50,701 DEBUG main annotation.InjectionMetadata:60 - Found injected element on class [es.unican.meteo.validator.ResetPasswordValidation]: AutowiredFieldElement for private es.unican.meteo.service.UserService es.unican.meteo.validator.ResetPasswordValidation.userService
12:48:50,702 DEBUG main annotation.InjectionMetadata:60 - Found injected element on class [es.unican.meteo.validator.ResetPasswordValidation]: AutowiredFieldElement for private es.unican.meteo.service.MessageService es.unican.meteo.validator.ResetPasswordValidation.messageService
12:48:50,702 DEBUG main support.DefaultListableBeanFactory:504 - Eagerly caching bean 'resetPasswordValidation' to allow for resolving potential circular references
12:48:50,707 DEBUG main annotation.InjectionMetadata:85 - Processing injected method of bean 'resetPasswordValidation': AutowiredFieldElement for private es.unican.meteo.service.UserService es.unican.meteo.validator.ResetPasswordValidation.userService
Make sure you annotate the class so Spring picks it up as a bean. Autowiring can only occur on beans/classes managed by the DI container.
Adding #Component will cause the class to be picked up by Spring's component scanning, causing ResetPasswordValidation to become a bean. At this point, it should be eligible to have fields autowired.
#Component
public class ResetPasswordValidation implements Validator
As explained here and here it is quite clear how to do it but still can't seem to make it work.
I simply like to use the #Value annotation in order to inject a property to a spring bean. I created a basic spring MVC project with one controller and one bean.
Here is my application context:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:util="http://www.springframework.org/schema/util" xmlns:beans="http://www.springframework.org/schema/beans"
xsi:schemaLocation="
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.1.xsd
http://www.springframework.org/schema/oxm http://www.springframework.org/schema/oxm/spring-oxm-3.1.xsd">
<!-- Root Context: defines shared resources visible to all other web components -->
<context:component-scan base-package="me.co.fatsecret" />
<!-- Properties -->
<bean id="props"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:fatProperties.properties" />
</bean>
</beans>
I have one bean called Configuration:
package me.co.fatsecret;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
#Component
public class Configuration {
/*--- Members ---*/
#Value("${api_key}")
protected String API_KEY;
#Value("${api_secret}")
protected String API_SECRET;
#Value("${api_url}")
protected String API_URL;
/*--- Constructors ---*/
public Configuration() {
}
/*--- Getters & Setters ---*/
public String getAPI_KEY() {
return API_KEY;
}
public void setAPI_KEY(String aPI_KEY) {
API_KEY = aPI_KEY;
}
public String getAPI_SECRET() {
return API_SECRET;
}
public void setAPI_SECRET(String aPI_SECRET) {
API_SECRET = aPI_SECRET;
}
public String getAPI_URL() {
return API_URL;
}
public void setAPI_URL(String aPI_URL) {
API_URL = aPI_URL;
}
}
Now I have only one controller, injected with this Configuration class and as I call this controller I see that the values in the Configuration class are not populated right.
My properties file is located under the resources folder (src/main/resources) and is a part of my classpath (done by default since this is a maven project). Here it is:
api_url=http://platform.fatsecret.com/js?
api_key=SomeKey
api_secret=SomeSecret
The file name is fatProperties.properties.
As I debug my server when calling the controller I see that the content of the Configuration class is:
${api_key}
${api_secret}
${api_url}
This is the actual value of the Strings, wich means that the vales from the properties file are not getting injected for some reason.
Am I missing something here?
UPDATE1: I replaced the PropertyPlaceholderConfigurer bean with:
<context:property-placeholder location="classpath:fatProperties.properties"/>
Getting the same result
Ok, got it!
I'm using a spring MVC project, which means I have a separated context for my web layer (the controllers). The "Configuration" bean which hods the properties using the #Value annotation is injected to a controller. My property-placeholder is defined within my root-context hence it cannot be seen from my controller. To resolve the issue I simply added the property-placeholder definition to my DispatcherServlet context and it works like a charm :)
Add this to your application context file:
<context:property-placeholder location="classpath:fatProperties.properties" />
Try
#Value("#{props['api_key']}")
private String apiKey;
Is it correct that one can create spring beans using just the #Component annotation as long as context component scanning is configured?
Using spring 3.0.5 with Java 6.
My test case is:
#ContextConfiguration(locations={"classpath:spring-bean.xml"})
public class ServerServiceUnitTest extends AbstractJUnit4SpringContextTests {
#Autowired
private ServerService serverService;
#Test
public void test_server_service() throws Exception {
serverService.doSomething();
//additional test code here
}
}
The spring-bean.xml file contains:
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<context:annotation-config/>
</beans>
My class I want to be a bean is:
#Component("ServerService")
public class ServerServiceImpl implements ServerService {
private static final String SERVER_NAME = "test.nowhere.com";
//method definitions.....'
}
Should that not be sufficient for spring to instantiate the ServerService bean and do the autowiring?
The error I get is:
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [serversystem.ServerService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {#org.springframework.beans.factory.annotation.Autowired(required=true)}
I'm sure I'm missing something simple.
You have not defined in your spring-beans.xml the <context:component-scan> element:
<context:component-scan base-package="the.package.with.your.service"/>
The inclusion of
<context:annotation-config/>
only allows you to use #Required, #Autowired, and #Inject annotations for configuration. By specifying the <context:component-scan>, you are telling Spring where to look for #Component annotations.
if you are using annotated controllers and other features
you should include
<mvc:annotation-driven/>
you should use
<context:component-scan base-package="spring3.example.controllers"/>
to specify the package in which controller classes are stored.