No candidate found for Autowired bean

Question

At a customer, I'm working on an application that requires auditing. These auditing records should be viewable in a web page and I'm modifying the currently existing data to do just that. Maven compiles the code without errors, but when calling the webpage to display the audit records, I receive the following exception

04-Jan-2017 15:22:25.133 WARNING [http-nio-7443-exec-7] org.glassfish.jersey.server.spring.AutowiredInjectResolver.getBeanFromSpringContext No qualifying bean of type 'my.company.app.audit.service.IAuditService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
04-Jan-2017 15:22:25.167 WARNING [http-nio-7443-exec-7] org.glassfish.jersey.internal.Errors.logErrors The following warnings have been detected: WARNING: Unknown HK2 failure detected:
MultiException stack 1 of 3
org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'my.company.app.audit.service.IAuditService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

MultiException stack 2 of 3
java.lang.IllegalArgumentException: While attempting to resolve the dependencies of my.company.app.audit.rest.resources.AuditResource errors were found

MultiException stack 3 of 3
java.lang.IllegalStateException: Unable to perform operation: resolve on my.company.app.audit.rest.resources.AuditResource

The application class

package my.company.app.audit;

public class AuditApplication extends ResourceConfig {
    public AuditApplication() {
        register(AuditResource.class);
    }
}

The Resource class

package my.company.app.audit.rest.resources;

@Path(AUDIT_RESOURCE_LINK)
@Produces({ MediaType.APPLICATION_JSON })
public class AuditResource extends AbstractResource {
    @Autowired
    private IAuditService auditService;  // Commenting out this line results in the exception no longer popping up
}

The Service class

package my.company.app.audit.service;

import org.springframework.stereotype.Service;

@Service
public class AuditService implements IAuditService {
}

Audit application specific config: audit-config.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:jpa="http://www.springframework.org/schema/data/jpa"
   xmlns:aop="http://www.springframework.org/schema/aop"
   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.xsd
   http://www.springframework.org/schema/data/jpa
   http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
   http://www.springframework.org/schema/aop
   http://www.springframework.org/schema/aop/spring-aop.xsd">

    <context:annotation-config/>

    <context:component-scan base-package="my.company.app.audit"/>

    <jpa:repositories base-package="my.company.app.audit" transaction-manager-ref="txManager"/>

    <aop:aspectj-autoproxy/>

</beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0" metadata-complete="true">

    <display-name>foo web_audit</display-name>

    <!--  SESSION -->
    <session-config>
        <session-timeout>30</session-timeout>
        <cookie-config>
            <name>WEB_AUDIT</name>
            <path>/</path>
            <http-only>true</http-only>
            <secure>true</secure>
        </cookie-config>
    </session-config>

    <!-- SPRING -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            classpath:applicationContext.xml,
            classpath:foo-json-serialization-beans.xml,
            classpath:foo-dao-jpa-beans.xml,
            classpath:foo-dao-jpa-vendor-adapter-beans.xml,
            classpath:spring/foo-jpa-services-common.xml,
            classpath:audit-config.xml,
            classpath:iam-config.xml
        </param-value>
    </context-param>
    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>

    <!-- FILTER -->
    <filter>
        <filter-name>securityHeadersFilter</filter-name>
        <filter-class>my.company.fooshared.web.filter.SecurityHeadersFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>securityHeadersFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <filter>
        <filter-name>SSOFilter</filter-name>
        <filter-class>my.company.fooshared.webaccess.filter.WebAccessFilter</filter-class>
        <init-param>
            <param-name>acsUrl</param-name>
            <param-value>/acs</param-value>
        </init-param>
        <init-param>
            <param-name>logoutUrl</param-name>
            <param-value>/logout</param-value>
        </init-param>
        <init-param>
            <param-name>authRequestUrl</param-name>
            <param-value>/authRequest</param-value>
        </init-param>       
        <init-param>
            <param-name>spProviderId</param-name>
            <param-value>screeningutility-ci.browse.companynet.sipn.company.com</param-value>
        </init-param>
        <init-param>
            <param-name>idProviderSSOUrl</param-name>
            <param-value>https://idp.companynet.sipn.company.com/idp/profile/SAML2/POST/SSO</param-value>
        </init-param>
        <init-param>
            <param-name>cacertPath</param-name>
            <param-value>/var/lib/tomcat/cacert/</param-value>
        </init-param>
        <init-param>
            <param-name>keystoreFile</param-name>
            <param-value>/var/lib/tomcat/jks/suchannel.jks</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>SSOFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- JERSEY -->
    <servlet>
        <servlet-name>Jersey2Dispatcher</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>javax.ws.rs.Application</param-name>
            <param-value>my.company.app.audit.AuditApplication</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Jersey2Dispatcher</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>

    <error-page>
        <location>/error.html</location>
    </error-page>

</web-app>

I took a resembling module as example to build my code on. That other module works fine, so I must be missing something... Any suggestion is welcome.

When adding default constructors and setting breakpoints inside them, I notice that the constructor of the AuditService class is never called.

Answer 1

Autowiring the class itself instead of the implemented interface solved this issue. I have no explanation of why the interface didn't work.

Edit

I have probably found the cause of the issue.

While modifying the code, I introduced some new modules in maven. Those new modules are child-modules of the module that initially contained the code.

Old situation:        New siuation:
audit-module           audit-module
|- src                |- persistence
|- target             |  |- src
|- pom.xml            |  |- target
                      |  |- pom.xml
                      |- service
                      |  |- src
                      |  |- target
                      |  |- pom.xml
                      |- web
                      |  |- src
                      |  |- target
                      |  |- pom.xml
                      |- pom.xml

But other modules that were relying on the old audit-module were not updated and thus were refering to the parent of the new modules. This is likely the cause that the AuditService class was not loaded properly by Spring