如何使用Maven構建和部署遠程EJB？

Question

我想使用Maven構建和部署遠程EJB。後來，我希望能夠將這個EJB注入並使用到一個單獨的WAR項目中。

所以我想我需要一個定義接口的jar文件，並在兩個項目（ejb和war）中使用jar。

我有這樣的接口，在Maven項目叫example:api，打包成JAR：

package example; 

import javax.ejb.Remote; 

@Remote 
public interface Bean { 

    void process(); 
} 

我實現另一個叫example:ejb Maven項目上面的接口，封裝成EJB：

package example; 

import javax.ejb.Stateless; 

@Stateless 
public class Ejb implements Bean { 

    @Override 
    public void process() { 
    } 
} 

ejb項目使用maven-ejb-plugin：

<plugin> 
    <groupId>org.apache.maven.plugins</groupId> 
    <artifactId>maven-ejb-plugin</artifactId> 
    <version>2.3</version> 
    <configuration> 
     <ejbVersion>3.1</ejbVersion> 
    </configuration> 
</plugin> 

而且這兩個項目取決於javaee-api：

<dependency> 
    <groupId>javax</groupId> 
    <artifactId>javaee-api</artifactId> 
    <version>6.0</version> 
    <scope>provided</scope> 
</dependency> 

我們把它們放在一起，我做了第三Maven項目，叫做example:ear，打包爲ear：

<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>example</groupId> 
    <artifactId>ear</artifactId> 
    <version>0.0.1-SNAPSHOT</version> 
    <packaging>ear</packaging> 
    <name>ear</name> 

    <dependencies> 
     <dependency> 
      <groupId>example</groupId> 
      <artifactId>api</artifactId> 
      <version>0.0.1-SNAPSHOT</version> 
      <type>jar</type> 
     </dependency> 
     <dependency> 
      <groupId>example</groupId> 
      <artifactId>ejb</artifactId> 
      <version>0.0.1-SNAPSHOT</version> 
      <type>ejb</type> 
     </dependency> 
    </dependencies> 

    <build> 
     <finalName>${project.artifactId}</finalName> 
     <plugins> 
      <plugin> 
       <groupId>org.apache.maven.plugins</groupId> 
       <artifactId>maven-ear-plugin</artifactId> 
       <configuration> 
        <modules> 
         <ejbModule> 
          <groupId>example</groupId> 
          <artifactId>ejb</artifactId> 
         </ejbModule> 
         <jarModule> 
          <groupId>example</groupId> 
          <artifactId>api</artifactId> 
         </jarModule> 
        </modules> 
       </configuration> 
      </plugin> 
     </plugins> 
    </build> 
</project> 

的問題是，我可以」不要部署這個耳朵項目。我收到以下錯誤：

09:39:39,702 INFO [org.jboss.as.server.deployment.scanner] (DeploymentScanner-threads - 2) JBAS015003: Found ear.ear in deployment directory. To trigger deployment create a file called ear.ear.dodeploy 
09:39:39,713 INFO [org.jboss.as.server.deployment] (MSC service thread 1-6) JBAS015876: Starting deployment of "ear.ear" 
09:39:39,773 INFO [org.jboss.as.server.deployment] (MSC service thread 1-1) JBAS015876: Starting deployment of "ejb-0.0.1-SNAPSHOT.jar" 
09:39:39,793 WARN [org.jboss.modules] (MSC service thread 1-8) Failed to define class example.Ejb in Module "deployment.ear.ear.ejb-0.0.1-SNAPSHOT.jar:main" from Service Module Loader: java.lang.LinkageError: Failed to link example/Ejb (Module "deployment.ear.ear.ejb-0.0.1-SNAPSHOT.jar:main" from Service Module Loader) 
    at org.jboss.modules.ModuleClassLoader.defineClass(ModuleClassLoader.java:396) 
[...] 
Caused by: java.lang.NoClassDefFoundError: example/Bean 
    at java.lang.ClassLoader.defineClass1(Native Method) [rt.jar:1.7.0_03] 
[...] 
Caused by: java.lang.ClassNotFoundException: example.Bean from [Module "deployment.ear.ear.ejb-0.0.1-SNAPSHOT.jar:main" from Service Module Loader] 
    at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190) 

我正在使用JBoss AS 7.1.1，如果它有任何區別。

你知道我在做什麼錯嗎？

Answer 1

我改變的maven-ear-plugin配置：

<plugin> 
    <groupId>org.apache.maven.plugins</groupId> 
    <artifactId>maven-ear-plugin</artifactId> 
    <version>2.6</version> 
    <configuration> 
     <version>6</version> 
     <defaultLibBundleDir>lib</defaultLibBundleDir> 
    </configuration> 
</plugin> 

這樣，它的工作原理。