Importing Spring Beans from jar

Question

I've been reading questions like this about importing beans from a project containded in a jar file. But what I have in my project (let's call Project A) is just a mvc-config.xml in WEB-INF folder, and application-config.xml in src/main/resources/spring folder (both cometh from the Spring Web Maven template).

I'm defining beans, services and repositories through annotations, in the very classes, and until now, I didn't need any other configuration, like defining beans in mvc-config.xml. This file is, until now, quite spartan, as shown below. But when I pack this project in a jar, imported it in another project (let's call Project B) and try to autowire Dao implementations (in Project B), an error

Severe: Context initialization failed
java.lang.NoClassDefFoundError: com/mycompany/dao/EntityDao

is thrown. Note that this specific class was defined through an interface implementation, which was being autowired in native project very well.

Are these problems occouring because I didn't managed to correctly import Project A in Project B, or do I need to do another kind of arrangement in order to use @Repository, @Entity and other Spring stuff from Project A? What should I do to use that services from Project A in Project B? Thanks!

• Project B mvc-config.xml

   <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd 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"> <context:component-scan base-package="com.mycompany"/> <mvc:annotation-driven /> <context:annotation-config/> <mvc:default-servlet-handler/> <import resource="classpath*:/WEB-INF/mvc-config.xml" /> <import resource="classpath*:/spring/application-config.xml" /> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/view/"/> <property name="suffix" value=".jsp"/> </bean> 

• Stack tracing for thrown error:

 Severe: Context initialization failed java.lang.NoClassDefFoundError: com/mycompany/EntityDao at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2521) at java.lang.Class.getDeclaredMethods(Class.java:1845) at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:571) at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:489) at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:473) at org.springframework.util.ReflectionUtils.getUniqueDeclaredMethods(ReflectionUtils.java:534) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:663) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:593) at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1394) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:385) at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:354) at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:97) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:609) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4206) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4705) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057) at org.apache.catalina.core.StandardHost.start(StandardHost.java:840) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463) at org.apache.catalina.core.StandardService.start(StandardService.java:525) at org.apache.catalina.core.StandardServer.start(StandardServer.java:754) at org.apache.catalina.startup.Catalina.start(Catalina.java:595) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414) Caused by: java.lang.ClassNotFoundException: com.mycompany.EntityDao at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526) ... 33 more 

Answer 1

You seem to be on a wrong path here, first of all your project has a mvc-config.xml file which implies that it is a web project project, i have never seen a web project used inside another web project, if you packed project A as jar make sure it contains WEB-INF folder. than make sure that project A jar is available at runtime. Is this a maven project and how you are trying to run this?