Wsrtjtyk

I have a problem with a multi-module project with spring mvc.

I have a project divided into a parent with two submodules "rest" and "core", "rest" will contain the controllers and "core" the objects that I will go to manipoalre with the rest
I wrote the parent's pom file like this:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <artifactId>parent</artifactId>

  <packaging>pom</packaging>

  <description>parent module for hive multi module implementation</description>

  <groupId>com.hive.api</groupId>

  <version>0.0.1-SNAPSHOT</version>

  <name>HIVE</name>

  <modules>

    <module>rest</module>

    <module>core</module>

  </modules>



 <build>

    <finalName>${project.name}</finalName>

    <plugins>

        <plugin>

            <artifactId>maven-eclipse-plugin</artifactId>

            <version>2.9</version>

            <configuration>

                <additionalProjectnatures>

                    <projectnature>org.springframework.ide.eclipse.core.springnature</projectnature>

                </additionalProjectnatures>

                <additionalBuildcommands>

                    <buildcommand>org.springframework.ide.eclipse.core.springbuilder</buildcommand>

                </additionalBuildcommands>

                <downloadSources>true</downloadSources>

                <downloadJavadocs>true</downloadJavadocs>

            </configuration>

        </plugin>



        <plugin>

            <groupId>org.codehaus.mojo</groupId>

            <artifactId>exec-maven-plugin</artifactId>

            <version>1.2.1</version>

            <configuration>

                <mainClass>org.test.int1.Main</mainClass>

            </configuration>

        </plugin>

    </plugins>

 </build>

</project>

the rest pom is:

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <artifactId>rest</artifactId>

    <name>rest</name> 

    <packaging>war</packaging>

    <properties>

        <java-version>1.8</java-version>

        <org.springframework-version>5.0.4.RELEASE</org.springframework-version>

        <org.aspectj-version>1.6.10</org.aspectj-version>

        <org.slf4j-version>1.6.6</org.slf4j-version>

    </properties>

    <dependencies>

        <!-- Spring -->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-context</artifactId>

            <version>${org.springframework-version}</version>

            <exclusions>

                <!-- Exclude Commons Logging in favor of SLF4j -->

                <exclusion>

                    <groupId>commons-logging</groupId>

                    <artifactId>commons-logging</artifactId>

                </exclusion>

            </exclusions>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-webmvc</artifactId>

            <version>${org.springframework-version}</version>

        </dependency>



        <!-- AspectJ -->

        <dependency>

            <groupId>org.aspectj</groupId>

            <artifactId>aspectjrt</artifactId>

            <version>${org.aspectj-version}</version>

        </dependency>



        <!-- Logging -->

        <dependency>

            <groupId>org.slf4j</groupId>

            <artifactId>slf4j-api</artifactId>

            <version>${org.slf4j-version}</version>

        </dependency>

        <dependency>

            <groupId>org.slf4j</groupId>

            <artifactId>jcl-over-slf4j</artifactId>

            <version>${org.slf4j-version}</version>

            <scope>runtime</scope>

        </dependency>

        <dependency>

            <groupId>org.slf4j</groupId>

            <artifactId>slf4j-log4j12</artifactId>

            <version>${org.slf4j-version}</version>

            <scope>runtime</scope>

        </dependency>

        <dependency>

            <groupId>log4j</groupId>

            <artifactId>log4j</artifactId>

            <version>1.2.15</version>

            <exclusions>

                <exclusion>

                    <groupId>javax.mail</groupId>

                    <artifactId>mail</artifactId>

                </exclusion>

                <exclusion>

                    <groupId>javax.jms</groupId>

                    <artifactId>jms</artifactId>

                </exclusion>

                <exclusion>

                    <groupId>com.sun.jdmk</groupId>

                    <artifactId>jmxtools</artifactId>

                </exclusion>

                <exclusion>

                    <groupId>com.sun.jmx</groupId>

                    <artifactId>jmxri</artifactId>

                </exclusion>

            </exclusions>

            <scope>runtime</scope>

        </dependency>



        <!-- @Inject -->

        <dependency>

            <groupId>javax.inject</groupId>

            <artifactId>javax.inject</artifactId>

            <version>1</version>

        </dependency>



        <!-- Servlet -->



        <dependency>

            <groupId>javax.servlet.jsp</groupId>

            <artifactId>jsp-api</artifactId>

            <version>2.1</version>

            <scope>provided</scope>

        </dependency>

        <dependency>

            <groupId>javax.servlet</groupId>

            <artifactId>jstl</artifactId>

            <version>1.2</version>

        </dependency>

        <dependency>

            <groupId>javax.servlet</groupId>

            <artifactId>javax.servlet-api</artifactId>

            <version>4.0.0</version>

            <scope>provided</scope>

        </dependency>



        <!-- Test -->

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.12</version>

            <scope>test</scope>

            <exclusions>

                <exclusion>

                    <groupId>org.hamcrest</groupId>

                    <artifactId>hamcrest-core</artifactId>

                </exclusion>

            </exclusions>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-test</artifactId>

            <version>${org.springframework-version}</version>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.hamcrest</groupId>

            <artifactId>hamcrest-all</artifactId>

            <version>1.3</version>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.mockito</groupId>

            <artifactId>mockito-core</artifactId>

            <version>2.18.0</version>

            <exclusions>

                <exclusion>

                    <groupId>org.hamcrest</groupId>

                    <artifactId>hamcrest-core</artifactId>

                </exclusion>

            </exclusions>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>com.jayway.jsonpath</groupId>

            <artifactId>json-path-assert</artifactId>

            <version>2.2.0</version>

            <scope>test</scope>

            <exclusions>

                <exclusion>

                    <groupId>org.hamcrest</groupId>

                    <artifactId>hamcrest-core</artifactId>

                </exclusion>

                <exclusion>

                    <groupId>org.slf4j</groupId>

                    <artifactId>slf4j-api</artifactId>

                </exclusion>

            </exclusions>

        </dependency>



        <!-- Jackson -->

        <dependency>

            <groupId>org.codehaus.jackson</groupId>

            <artifactId>jackson-mapper-asl</artifactId>

            <version>1.9.13</version>

        </dependency>

        <dependency>

            <groupId>com.fasterxml.jackson.core</groupId>

            <artifactId>jackson-databind</artifactId>

            <version>2.9.4</version>

        </dependency>

        <!-- Hibernate -->

        <dependency>

            <groupId>org.hibernate</groupId>

            <artifactId>hibernate-core</artifactId>

            <version>5.2.16.Final</version>

        </dependency>

        <dependency>

            <groupId>org.hibernate.javax.persistence</groupId>

            <artifactId>hibernate-jpa-2.1-api</artifactId>

            <version>1.0.0.Final</version>

        </dependency>

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <version>5.1.28</version>

        </dependency>

        <dependency>

            <groupId>commons-dbcp</groupId>

            <artifactId>commons-dbcp</artifactId>

            <version>1.4</version>

        </dependency>



        <!-- Lombok --> 

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <version>1.18.4</version>

            <scope>provided</scope>

        </dependency>  



        <!-- Spring Security -->

        <dependency>

            <groupId>org.springframework.security</groupId>

            <artifactId>spring-security-web</artifactId>

            <version>5.0.4.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>org.springframework.security</groupId>

            <artifactId>spring-security-config</artifactId>

            <version>5.0.4.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>io.jsonwebtoken</groupId>

            <artifactId>jjwt</artifactId>

            <version>0.9.0</version>

        </dependency>



        <dependency>

            <groupId>javax.validation</groupId>

            <artifactId>validation-api</artifactId>

            <version>1.1.0.Final</version>

        </dependency>

        <dependency>

            <groupId>org.hibernate</groupId>

            <artifactId>hibernate-validator</artifactId>

            <version>5.4.1.Final</version>

        </dependency>

        <dependency>

            <groupId>com.hive.api</groupId>

            <artifactId>core</artifactId>

            <version>{project.parent.version}</version>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <artifactId>maven-eclipse-plugin</artifactId>

                <version>2.9</version>

                <configuration>

                    <additionalProjectnatures>

                        <projectnature>org.springframework.ide.eclipse.core.springnature</projectnature>

                    </additionalProjectnatures>

                    <additionalBuildcommands>

                        <buildcommand>org.springframework.ide.eclipse.core.springbuilder</buildcommand>

                    </additionalBuildcommands>

                    <downloadSources>true</downloadSources>

                    <downloadJavadocs>true</downloadJavadocs>

                </configuration>

            </plugin>



            <plugin>

                <groupId>org.codehaus.mojo</groupId>

                <artifactId>exec-maven-plugin</artifactId>

                <version>1.2.1</version>

                <configuration>

                    <mainClass>org.test.int1.Main</mainClass>

                </configuration>

            </plugin>

        </plugins>

    </build>

    <parent>

        <groupId>com.hive.api</groupId>

        <artifactId>parent</artifactId>

        <version>0.0.1-SNAPSHOT</version>

    </parent>

</project>

and the core pom:

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <artifactId>core</artifactId>

    <name>core</name>

    <packaging>jar</packaging>

    <properties>

        <java-version>1.8</java-version>

        <org.springframework-version>5.0.4.RELEASE</org.springframework-version>

        <org.aspectj-version>1.6.10</org.aspectj-version>

        <org.slf4j-version>1.6.6</org.slf4j-version>

    </properties>

    <dependencies>

        <!-- Spring -->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-context</artifactId>

            <version>${org.springframework-version}</version>

            <exclusions>

                <!-- Exclude Commons Logging in favor of SLF4j -->

                <exclusion>

                    <groupId>commons-logging</groupId>

                    <artifactId>commons-logging</artifactId>

                 </exclusion>

            </exclusions>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-webmvc</artifactId>

            <version>${org.springframework-version}</version>

        </dependency>



        <!-- AspectJ -->

        <dependency>

            <groupId>org.aspectj</groupId>

            <artifactId>aspectjrt</artifactId>

            <version>${org.aspectj-version}</version>

        </dependency>   



        <!-- Logging -->

        <dependency>

            <groupId>org.slf4j</groupId>

            <artifactId>slf4j-api</artifactId>

            <version>${org.slf4j-version}</version>

        </dependency>

        <dependency>

            <groupId>org.slf4j</groupId>

            <artifactId>jcl-over-slf4j</artifactId>

            <version>${org.slf4j-version}</version>

            <scope>runtime</scope>

        </dependency>

        <dependency>

            <groupId>org.slf4j</groupId>

            <artifactId>slf4j-log4j12</artifactId>

            <version>${org.slf4j-version}</version>

            <scope>runtime</scope>

        </dependency>

        <dependency>

            <groupId>log4j</groupId>

            <artifactId>log4j</artifactId>

            <version>1.2.15</version>

            <exclusions>

                <exclusion>

                    <groupId>javax.mail</groupId>

                    <artifactId>mail</artifactId>

                </exclusion>

                <exclusion>

                    <groupId>javax.jms</groupId>

                    <artifactId>jms</artifactId>

                </exclusion>

                <exclusion>

                    <groupId>com.sun.jdmk</groupId>

                    <artifactId>jmxtools</artifactId>

                </exclusion>

                <exclusion>

                    <groupId>com.sun.jmx</groupId>

                    <artifactId>jmxri</artifactId>

                </exclusion>

            </exclusions>

            <scope>runtime</scope>

        </dependency>



        <!-- @Inject -->

        <dependency>

            <groupId>javax.inject</groupId>

            <artifactId>javax.inject</artifactId>

            <version>1</version>

        </dependency>



        <!-- Servlet -->

        <dependency>

            <groupId>javax.servlet</groupId>

            <artifactId>servlet-api</artifactId>

            <version>2.5</version>

            <scope>provided</scope>

        </dependency>

        <dependency>

            <groupId>javax.servlet.jsp</groupId>

            <artifactId>jsp-api</artifactId>

            <version>2.1</version>

            <scope>provided</scope>

        </dependency>

        <dependency>

            <groupId>javax.servlet</groupId>

            <artifactId>jstl</artifactId>

            <version>1.2</version>

        </dependency>



        <!-- Test -->

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.7</version>

            <scope>test</scope>

        </dependency>   



        <!-- Jackson -->

        <dependency>

            <groupId>org.codehaus.jackson</groupId>

            <artifactId>jackson-mapper-asl</artifactId>

            <version>1.9.13</version>

        </dependency>

        <dependency>

            <groupId>com.fasterxml.jackson.core</groupId>

            <artifactId>jackson-databind</artifactId>

            <version>2.9.4</version>

        </dependency>



        <!-- Hibernate -->

        <dependency>

            <groupId>org.hibernate</groupId>

            <artifactId>hibernate-core</artifactId>

            <version>5.2.16.Final</version>

        </dependency>

        <dependency>

            <groupId>org.hibernate.javax.persistence</groupId>

            <artifactId>hibernate-jpa-2.1-api</artifactId>

            <version>1.0.0.Final</version>

        </dependency>

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <version>5.1.28</version>

        </dependency>

        <dependency>

            <groupId>commons-dbcp</groupId>

            <artifactId>commons-dbcp</artifactId>

            <version>1.4</version>

        </dependency>



        <!-- Lombok --> 

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <version>1.18.4</version>

            <scope>provided</scope>

        </dependency>     

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <artifactId>maven-eclipse-plugin</artifactId>

                <version>2.9</version>

                <configuration>

                    <additionalProjectnatures>

                        <projectnature>org.springframework.ide.eclipse.core.springnature</projectnature>

                    </additionalProjectnatures>

                    <additionalBuildcommands>

                        <buildcommand>org.springframework.ide.eclipse.core.springbuilder</buildcommand>

                    </additionalBuildcommands>

                    <downloadSources>true</downloadSources>

                    <downloadJavadocs>true</downloadJavadocs>

                </configuration>

            </plugin>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-compiler-plugin</artifactId>

                <version>2.5.1</version>

                <configuration>

                    <source>1.6</source>

                    <target>1.6</target>

                    <compilerArgument>-Xlint:all</compilerArgument>

                    <showWarnings>true</showWarnings>

                    <showDeprecation>true</showDeprecation>

                </configuration>

            </plugin>

            <plugin>

                <groupId>org.codehaus.mojo</groupId>

                <artifactId>exec-maven-plugin</artifactId>

                <version>1.2.1</version>

                <configuration>

                    <mainClass>org.test.int1.Main</mainClass>

                </configuration>

            </plugin>

        </plugins>

    </build>

    <parent>

        <groupId>com.hive.api</groupId>

        <artifactId>parent</artifactId>

        <version>0.0.1-SNAPSHOT</version>

    </parent>

</project>

When I try to launch the tomcat server I get the following error:

    ERROR: org.springframework.web.servlet.DispatcherServlet - Context initialization failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping': Invocation of init method failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [com.hive.rest.controller.AuthenticationController] from ClassLoader [WebappClassLoader

  context: /rest

  delegate: false

  repositories:

    /WEB-INF/classes/

----------> Parent Classloader:

java.net.URLClassLoader@5ca881b5

]

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1710)

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:583)

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502)

    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312)

    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)

    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310)

    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200)

    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760)

    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868)

    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)

    at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:676)

    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:642)

    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:690)

    at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:558)

    at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:499)

    at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:172)

    at javax.servlet.GenericServlet.init(GenericServlet.java:158)

    at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1230)

    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1174)

    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1066)

    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5370)

    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5668)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1700)

    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1690)

    at java.util.concurrent.FutureTask.run(FutureTask.java:266)

    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

    at java.lang.Thread.run(Thread.java:748)

Caused by: java.lang.IllegalStateException: Failed to introspect Class [com.hive.rest.controller.AuthenticationController] from ClassLoader [WebappClassLoader

  context: /rest

  delegate: false

  repositories:

    /WEB-INF/classes/

----------> Parent Classloader:

java.net.URLClassLoader@5ca881b5

]

    at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:659)

    at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:556)

    at org.springframework.core.MethodIntrospector.selectMethods(MethodIntrospector.java:69)

    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.detectHandlerMethods(AbstractHandlerMethodMapping.java:235)

    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.initHandlerMethods(AbstractHandlerMethodMapping.java:218)

    at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.afterPropertiesSet(AbstractHandlerMethodMapping.java:188)

    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.afterPropertiesSet(RequestMappingHandlerMapping.java:129)

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1769)

    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1706)

    ... 28 more

Caused by: java.lang.NoClassDefFoundError: com/hive/core/User

    at java.lang.Class.getDeclaredMethods0(Native Method)

    at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)

    at java.lang.Class.getDeclaredMethods(Class.java:1975)

    at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:641)

    ... 36 more

Caused by: java.lang.ClassNotFoundException: com.hive.core.User

    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1907)

    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1750)

    ... 40 more

I do not understand where the error is, I think the configuration of the pom files is correct.

Inside the core module, inside the "com.hive.core" package there is a User class that is called by the AuthorizationController controller that is located inside the "com.hive.rest.controller" package inside the form rest

I assume User object is being created by Spring for DI.

Something wrong with the way packages is being defined.

Thumb Rule : Root package of module would be consider as default for scanning beans/components definition i.e. all stereotype annotations and all @Configuration

Your package declaration :

Parent : com.hive.api
Core : com.hive.core
Rest : com.hive.rest

When you would be starting the REST module then com.hive.rest would be scanned for beans and beans defined in core module will not be instantiated.

So either you need to define the bean(User) in a config file(@Configuration) in rest module if it seems feasible or else change default component scanning via adding @ComponentScan(basePackages = "com.hive") in config file of rest modole.

Above theory is applied for only spring managed beans.

While it is perfectly fine to manually create(new User()) the object in rest modole as long as that is available in classpath.

Hope this helps.