Java，Maven项目- Glassfish4中的CDI部署失败

Question

我正在一个Java项目中工作，在尝试部署到Glassfish4服务器时，我遇到了依赖注入的问题。

maven项目在顶级pom下由三个单独的模块组成，如下所示：

克罗诺斯：

• 耳朵
• ejb
• 网站

Kronos是父模块，web处理前端代码(JSF，ManagedBeans)，ejb有后端代码(ejb，JPA)，ear处理ear伪产物的生成和部署。文章末尾列出了实际的pom.xml文件。

在ejb模块中，我们有一个StaffDAO接口和一个StaffDAOImpl无状态bean (带注释的@javax.ejb.Stateless)。目前，这是代码中唯一的EJB，当然也是实现StaffDAO的唯一bean。

当尝试在web组件中的ManagedBean (@ManagedBean，@RequestScoped)中注入StaffDAO类型的@Inject注释时，当试图部署到Glassfish时，我们会得到以下错误：

    [glassfish 4.0] [SEVERE] [] [javax.enterprise.system.core] [tid: _ThreadID=35 _ThreadName=admin-listener(4)] [timeMillis: 1393775922183] [levelValue: 1000] [[
      Exception while loading the app : CDI deployment failure:WELD-001409 Ambiguous dependencies for type [StaffDAO] with qualifiers [@Default] at injection point [[BackedAnnotatedField] @Inject private managedbeans.DummyUserBean.staffDAO]. Possible dependencies [[Session bean [class persistence.dao.impl.StaffDAOImpl with qualifiers [@Any @Default]; local interfaces are [StaffDAO], Session bean [class persistence.dao.impl.StaffDAOImpl with qualifiers [@Any @Default]; local interfaces are [StaffDAO]]]
    org.jboss.weld.exceptions.DeploymentException: WELD-001409 Ambiguous dependencies for type [StaffDAO] with qualifiers [@Default] at injection point [[BackedAnnotatedField] @Inject private managedbeans.DummyUserBean.staffDAO]. Possible dependencies [[Session bean [class persistence.dao.impl.StaffDAOImpl with qualifiers [@Any @Default]; local interfaces are [StaffDAO], Session bean [class persistence.dao.impl.StaffDAOImpl with qualifiers [@Any @Default]; local interfaces are [StaffDAO]]]

相反，使用@EJB注释可以为我们提供：

[glassfish 4.0] [SEVERE] [NCLS-CORE-00026] [javax.enterprise.system.core] [tid: _ThreadID=34 _ThreadName=admin-listener(3)] [timeMillis: 1393776686187] [levelValue: 1000] [[
  Exception during lifecycle processing
java.lang.IllegalArgumentException: Cannot resolve reference [Remote ejb-ref name=managedbeans.DummyUserBean/staffDAO,Remote 3.x interface =persistence.dao.StaffDAO,ejb-link=null,lookup=,mappedName=,jndi-name=,refType=Session] because there are [2] ejbs in the application with interface persistence.dao.StaffDAO. 
Some of the possible causes: 
1. The EJB bean class was packaged in an ear lib library (or through any other library mechanism which makes the library visible to all component modules), this makes all the component modules include this bean class indirectly. 
2. The EJB bean class was packaged in a component module which references the EJB, either directly or indirectly through Manifest, WEB-INF/lib. 
The EJB bean class should only be packaged in the declaring ejb module and not the referencing modules. The referencing modules should only include EJB interfaces.

我相信，虽然我不确定，这是由于我们的伪制品生成中出现了一个错误，导致StaffDAOImpl EJB被打包了两次，但我对maven还不太熟悉，无法确认并修复它。任何帮助都将不胜感激。

代码：

StaffDAO：

public interface StaffDAO {...}

StaffDAOImpl：

import javax.ejb.Stateless;

@Stateless
public class StaffDAOImpl implements persistence.dao.StaffDAO {...}

DummyUserBean：

import javax.faces.bean.ManagedBean;
import javax.enterprise.context.RequestScoped;
import javax.inject.Inject;

@ManagedBean(name = "dummyUserBean")
@RequestScoped
public class DummyUserBean {

    @Inject
    private StaffDAO staffDAO;

    ...
}

pom.xml文件是：

克罗诺斯：

<?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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>kronos</groupId>
    <artifactId>kronos</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>ejb</module>
        <module>web</module>
        <module>ear</module>
    </modules>

    <dependencies>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>7.0</version>
        </dependency>
    </dependencies>

    <properties>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <build>
        <finalName>HelloGlassfish4</finalName>
    </build>
</project>

耳朵：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://maven.apache.org/POM/4.0.0"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>kronos</artifactId>
        <groupId>kronos</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>ear</artifactId>
    <packaging>ear</packaging>

    <dependencies>
        <dependency>
            <groupId>kronos</groupId>
            <artifactId>ejb</artifactId>
            <version>1.0-SNAPSHOT</version>
            <type>ejb</type>
        </dependency>

        <dependency>
            <groupId>kronos</groupId>
            <artifactId>web</artifactId>
            <version>1.0-SNAPSHOT</version>
            <type>war</type>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.glassfish.maven.plugin</groupId>
                <artifactId>maven-glassfish-plugin</artifactId>
                <version>2.1</version>
                <configuration>
                    <glassfishDirectory>${local.glassfish.home}</glassfishDirectory>
                    <user>${local.glassfish.user}</user>
                    <passwordFile>${local.glassfish.passfile}</passwordFile>
                    <domain>
                        <name>${local.glassfish.domain}</name>
                        <adminPort>${local.glassfish.adminPort}</adminPort>
                        <httpPort>${local.glassfish.httpPort}</httpPort>
                    </domain>
                    <components>
                        <component>
                            <name>${project.artifactId}</name>
                            <artifact>target/${project.build.finalName}.ear</artifact>
                        </component>
                    </components>
                    <debug>true</debug>
                    <terse>false</terse>
                    <echo>true</echo>
                </configuration>
            </plugin>

            <plugin>
                <artifactId>maven-ear-plugin</artifactId>
                <version>2.8</version>
                <configuration>
                    <modules>
                        <webModule>
                            <groupId>kronos</groupId>
                            <artifactId>web</artifactId>
                        </webModule>
                        <ejbModule>
                            <groupId>kronos</groupId>
                            <artifactId>ejb</artifactId>
                        </ejbModule>
                    </modules>
                    <defaultLibBundleDir>lib</defaultLibBundleDir>
                </configuration>
            </plugin>
        </plugins>
        <finalName>kronos</finalName>
    </build>
</project>

ejb：

<?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/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>kronos</artifactId>
        <groupId>kronos</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>ejb</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>3.6.7.Final</version>
        </dependency>

        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <version>9.2-1003-jdbc4</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.6</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
        </dependency>

        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-all</artifactId>
            <version>1.9.5</version>
        </dependency>

        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>16.0.1</version>
        </dependency>

        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>1.0.0.GA</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>4.1.0.Final</version>
        </dependency>

        <dependency>
            <groupId>joda-time</groupId>
            <artifactId>joda-time</artifactId>
            <version>2.3</version>
        </dependency>


    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.16</version>
                <configuration>
                    <skipTests>true</skipTests>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-ejb-plugin</artifactId>
                <version>2.3</version>
                <configuration>
                    <ejbVersion>3.2</ejbVersion>
                    <archive>
                        <manifest>
                            <addClasspath>true</addClasspath>
                        </manifest>
                    </archive>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

网站：

<?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/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>kronos</artifactId>
        <groupId>kronos</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>web</artifactId>
    <packaging>war</packaging>

    <dependencies>
        <dependency>
            <groupId>kronos</groupId>
            <artifactId>ejb</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>org.primefaces</groupId>
            <artifactId>primefaces</artifactId>
            <version>4.0</version>
            <type>jar</type>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <configuration>
                    <webXml>src\main\webapp\WEB-INF\web.xml</webXml>
                </configuration>
            </plugin>
        </plugins>
        <finalName>web</finalName>
    </build>
</project>

Answer 1

原来我的怀疑是正确的。因为web模块依赖于ejb模块，所以ejb类被添加到war存档中。正因为如此，当ear是从war和ejb构建的时，这些类最终被打包了两次，这就混淆了CDI。

我通过创建第四个maven模块来保存ejb和web模块所需的代码，并将其作为依赖项添加到这两个模块中，并打破了web对ejb的依赖。现在它很好用。