Team要使用EJB了，不再使用以前比较山寨的CGI+Google Protocol; 同时构建工具也变成了Maven。这几天做了些实验，想写一个最简单的Hello World。有一个EJB的Service，再有一个Client去使用这个服务。

几天下来有点小崩溃，相对EJB 3的教程来说，配置实在太麻烦，有太多的属性、参数、版本要做了。好在最后取得了成功，记在这里做个小结。

1. 工具的安装

Maven 3

从Apache的网站上下载，然后把${MAVEN_HOME}/bin目录加到系统的PATH下。

JBoss AS

我这里下载的是JBoss AS 7.1.1.Final压缩包。这里的版本非常重要，它和之后开发的其他包有依赖关系。

假设JBoss被解压到${JBOSS_HOME}下。

NOTE: 解压之后一定在JBoss的bin下运行add-user.bat，安装一个管理用户。这个很重要。

2. 写一个EJB的服务

写一个简单EJB服务很简单，我们可以有Maven的archetype生成一个工程的框架。

mvn archetype:generate -DgroupId=org.yli.learn -DartifactId=server -Dpackaging=ejb -Dversion=1.0 -Dpackage=org.yli.learn.server

1	mvn archetype:generate -DgroupId=org.yli.learn -DartifactId=server -Dpackaging=ejb -Dversion=1.0 -Dpackage=org.yli.learn.server

一路回车之后，就得到了一个Server的工程文件夹结构。但删掉默认生成的App.java和AppTest.java.

然后在org.yli.learn.server中，加入两个类。一个是接口SayHello，一个是EJB Bean类SayHelloBean.

package org.yli.learn.server;

public interface SayHello {

    String sayHello(String name);

}

package org.yli.learn.server;

public interface SayHello {

String sayHello(String name);

}

package org.yli.learn10.server;

import javax.ejb.Remote;
import javax.ejb.Stateless;

@Stateless
@Remote(SayHello.class)
public class SayHelloBean implements SayHello {

    public String sayHello(String name) {
        return &quot;Hello, &quot; + name + &quot;!&quot;;
    }

}

package org.yli.learn10.server;

import javax.ejb.Remote;

import javax.ejb.Stateless;

@Stateless

@Remote(SayHello.class)

public class SayHelloBean implements SayHello {

public String sayHello(String name) {

return "Hello, " + name + "!";

}

里面用到一些EJB 3的Annonation，大家自己查查书吧。

下一步就是修改pom.xml文件了，这里我们只要加入一些编译的依赖就行。

&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
&lt;project xmlns=&quot;http://maven.apache.org/POM/4.0.0&quot;
         xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot;
         xsi:schemaLocation=&quot;http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd&quot;&gt;
    &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;

    &lt;groupId&gt;org.yli.learn10&lt;/groupId&gt;
    &lt;artifactId&gt;server-side&lt;/artifactId&gt;
    &lt;version&gt;1.0&lt;/version&gt;
    &lt;packaging&gt;ejb&lt;/packaging&gt; &lt;!-- 注意: 这里是ejb类型的，为了使Cargo可以直接部署 --&gt;

    &lt;name&gt;JBoss AS Learn Server Side&lt;/name&gt;

   &lt;!-- 这里用到了依赖管理，为了统一依赖之间的版本 --&gt;
    &lt;dependencyManagement&gt;
        &lt;dependencies&gt;
            &lt;dependency&gt;
                &lt;groupId&gt;org.jboss.spec&lt;/groupId&gt;
                &lt;artifactId&gt;jboss-javaee-6.0&lt;/artifactId&gt;
                &lt;version&gt;3.0.0.Final&lt;/version&gt;
                &lt;type&gt;pom&lt;/type&gt;
                &lt;scope&gt;import&lt;/scope&gt;
            &lt;/dependency&gt;
        &lt;/dependencies&gt;
    &lt;/dependencyManagement&gt;

    &lt;dependencies&gt;
        &lt;dependency&gt;
            &lt;groupId&gt;org.jboss.spec.javax.annotation&lt;/groupId&gt;
            &lt;artifactId&gt;jboss-annotations-api_1.1_spec&lt;/artifactId&gt;
            &lt;scope&gt;provided&lt;/scope&gt;
        &lt;/dependency&gt;

        &lt;dependency&gt;
            &lt;groupId&gt;org.jboss.spec.javax.ejb&lt;/groupId&gt;
            &lt;artifactId&gt;jboss-ejb-api_3.1_spec&lt;/artifactId&gt;
            &lt;scope&gt;provided&lt;/scope&gt;
        &lt;/dependency&gt;
    &lt;/dependencies&gt;

    &lt;build&gt;
        &lt;!-- 最终部署到Jboss container里的app name --&gt;
        &lt;finalName&gt;yli_learn_ejb_server_app&lt;/finalName&gt;

        &lt;plugins&gt;
            &lt;plugin&gt;
                &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;
                &lt;version&gt;2.3.1&lt;/version&gt;
                &lt;configuration&gt;
                    &lt;source&gt;1.6&lt;/source&gt;
                    &lt;target&gt;1.6&lt;/target&gt;
                &lt;/configuration&gt;
            &lt;/plugin&gt;

            &lt;plugin&gt;
                &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt;
                &lt;artifactId&gt;maven-ejb-plugin&lt;/artifactId&gt;
                &lt;version&gt;2.3&lt;/version&gt;
                &lt;configuration&gt;
                    &lt;ejbVersion&gt;3.1&lt;/ejbVersion&gt;
                    &lt;generateClient&gt;true&lt;/generateClient&gt;
                &lt;/configuration&gt;
            &lt;/plugin&gt;

        &lt;/plugins&gt;

    &lt;/build&gt;

&lt;/project&gt;

<?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">

<groupId>org.yli.learn10</groupId>

<artifactId>server-side</artifactId>

<name>JBoss AS Learn Server Side</name>

<groupId>org.jboss.spec</groupId>

<artifactId>jboss-javaee-6.0</artifactId>

<version>3.0.0.Final</version>

<scope>import</scope>

</dependency>

</dependencies>

</dependencyManagement>

<groupId>org.jboss.spec.javax.annotation</groupId>

<artifactId>jboss-annotations-api_1.1_spec</artifactId>

<scope>provided</scope>

</dependency>

<groupId>org.jboss.spec.javax.ejb</groupId>

<artifactId>jboss-ejb-api_3.1_spec</artifactId>

<scope>provided</scope>

</dependency>

</dependencies>

<build>

<finalName>yli_learn_ejb_server_app</finalName>

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

</configuration>

</plugin>

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

<artifactId>maven-ejb-plugin</artifactId>

</configuration>

</plugin>

</plugins>

</build>

</project>

然后你可以编译安装了。

mvn clean install

1	mvn clean install

3. EJB Bean的部署

我选择了Cargo来部署Bean到JBoss里，好像有一个plugin叫jboss-as的，也可以做一样的事情。

我们只要在pom.xml加上：

...
&lt;build&gt;
&lt;plugins&gt;
...
&lt;plugin&gt;
                &lt;groupId&gt;org.codehaus.cargo&lt;/groupId&gt;
                &lt;artifactId&gt;cargo-maven2-plugin&lt;/artifactId&gt;
                &lt;version&gt;1.2.1&lt;/version&gt;

                &lt;configuration&gt;
                    &lt;container&gt;
                        &lt;containerId&gt;jboss71x&lt;/containerId&gt;
                        &lt;!-- Jboss 的安装目录 --&gt;
                        &lt;home&gt;E:/my_code/jboss-as-7.1.1.Final&lt;/home&gt;
                    &lt;/container&gt;

                    &lt;configuration&gt;
                        &lt;type&gt;existing&lt;/type&gt;
                        &lt;!-- Jboss下standalone目录，其实就是部署的目录 --&gt;
                        &lt;home&gt;E:/my_code/jboss-as-7.1.1.Final/standalone&lt;/home&gt;
                    &lt;/configuration&gt;

                    &lt;deployer&gt;
                        &lt;deployables&gt;
                            &lt;deployable&gt;
                                &lt;!-- 告诉cargo要部署哪个artifact --&gt;
                                &lt;groupId&gt;org.yli.learn&lt;/groupId&gt;
                                &lt;artifactId&gt;server&lt;/artifactId&gt;
                            &lt;/deployable&gt;
                        &lt;/deployables&gt;
                    &lt;/deployer&gt;

                &lt;/configuration&gt;

            &lt;/plugin&gt;
...
&lt;/plugins&gt;
&lt;/build&gt;

...

<build>

...

<groupId>org.codehaus.cargo</groupId>

<artifactId>cargo-maven2-plugin</artifactId>

<containerId>jboss71x</containerId>

<home>E:/my_code/jboss-as-7.1.1.Final</home>

</container>

<type>existing</type>

<home>E:/my_code/jboss-as-7.1.1.Final/standalone</home>

</configuration>

<groupId>org.yli.learn</groupId>

<artifactId>server</artifactId>

</deployable>

</deployables>

</deployer>

</configuration>

</plugin>

...

</plugins>

</build>

然后就可以用mvn的goal来部署和运行JBoss了

部署: mvn cargo:deployer-deploy
运行: mvn cargo:run或cargo:start

好了，这样我们写好的EJB就部署到了JBoss的容器中。

4. EJB的Client

这部分的配置有点让我的崩溃，花的时间也最多。

基本步骤也是先用maven建立一个框架，比如我们的工程是org.yli.learn:client:jar:1.0，包名是org.yli.learn.client.

我们在包里有一个Client，它会去向JBoss获取service并使用。

package org.yli.learn10.client;

import org.jboss.sasl.JBossSaslProvider;
import org.yli.learn10.server.SayHello;
import org.yli.learn10.server.SayHelloBean;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import java.security.Security;
import java.util.Hashtable;

public class Client {

    static {
        Security.addProvider(new JBossSaslProvider());
    }

    public static void main(String[] args) throws NamingException {
        final Hashtable jndiProperties = new Hashtable();
        jndiProperties.put(Context.URL_PKG_PREFIXES, &quot;org.jboss.ejb.client.naming&quot;);

        final Context context = new InitialContext(jndiProperties);

        SayHello sayHello = (SayHello) context.lookup(&quot;ejb:/yli_learn_ejb_server_app//&quot;
                        + SayHelloBean.class.getSimpleName() + &quot;!&quot; + SayHello.class.getName());

        System.out.println(sayHello.sayHello(&quot;Jason&quot;));
    }

}

package org.yli.learn10.client;

import org.jboss.sasl.JBossSaslProvider;

import org.yli.learn10.server.SayHello;

import org.yli.learn10.server.SayHelloBean;

import javax.naming.Context;

import javax.naming.InitialContext;

import javax.naming.NamingException;

import java.security.Security;

import java.util.Hashtable;

public class Client {

static {

Security.addProvider(new JBossSaslProvider());

}

public static void main(String[] args) throws NamingException {

final Hashtable jndiProperties = new Hashtable();

jndiProperties.put(Context.URL_PKG_PREFIXES, "org.jboss.ejb.client.naming");

final Context context = new InitialContext(jndiProperties);

SayHello sayHello = (SayHello) context.lookup("ejb:/yli_learn_ejb_server_app//"

+ SayHelloBean.class.getSimpleName() + "!" + SayHello.class.getName());

System.out.println(sayHello.sayHello("Jason"));

}

POM文件里有相关的依赖

&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;
&lt;project xmlns=&quot;http://maven.apache.org/POM/4.0.0&quot;
         xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot;
         xsi:schemaLocation=&quot;http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd&quot;&gt;
    &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt;
    &lt;artifactId&gt;client&lt;/artifactId&gt;
    &lt;groupId&gt;org.yli.learn10&lt;/groupId&gt;
    &lt;version&gt;1.0&lt;/version&gt;

    &lt;name&gt;JBoss AS Learn Client&lt;/name&gt;

    &lt;properties&gt;
        &lt;project.build.sourceEncoding&gt;UTF-8&lt;/project.build.sourceEncoding&gt;
    &lt;/properties&gt;

    &lt;dependencyManagement&gt;
        &lt;dependencies&gt;
            &lt;dependency&gt;
                &lt;groupId&gt;org.jboss.spec&lt;/groupId&gt;
                &lt;artifactId&gt;jboss-javaee-6.0&lt;/artifactId&gt;
                &lt;version&gt;3.0.0.Final&lt;/version&gt;
                &lt;type&gt;pom&lt;/type&gt;
                &lt;scope&gt;import&lt;/scope&gt;
            &lt;/dependency&gt;
        &lt;/dependencies&gt;
    &lt;/dependencyManagement&gt;

    &lt;dependencies&gt;
        &lt;dependency&gt;
            &lt;groupId&gt;org.jboss.spec.javax.transaction&lt;/groupId&gt;
            &lt;artifactId&gt;jboss-transaction-api_1.1_spec&lt;/artifactId&gt;
            &lt;scope&gt;runtime&lt;/scope&gt;
        &lt;/dependency&gt;

        &lt;dependency&gt;
            &lt;groupId&gt;org.jboss.spec.javax.ejb&lt;/groupId&gt;
            &lt;artifactId&gt;jboss-ejb-api_3.1_spec&lt;/artifactId&gt;
            &lt;scope&gt;runtime&lt;/scope&gt;
        &lt;/dependency&gt;

        &lt;dependency&gt;
            &lt;groupId&gt;org.jboss.xnio&lt;/groupId&gt;
            &lt;artifactId&gt;xnio-api&lt;/artifactId&gt;
            &lt;version&gt;3.0.3.GA&lt;/version&gt;
            &lt;scope&gt;runtime&lt;/scope&gt;
        &lt;/dependency&gt;

        &lt;dependency&gt;
            &lt;groupId&gt;org.jboss.xnio&lt;/groupId&gt;
            &lt;artifactId&gt;xnio-nio&lt;/artifactId&gt;
            &lt;version&gt;3.0.2.GA&lt;/version&gt;
            &lt;scope&gt;runtime&lt;/scope&gt;
        &lt;/dependency&gt;

        &lt;!-- The client needs JBoss remoting to access the server --&gt;
        &lt;dependency&gt;
            &lt;groupId&gt;org.jboss.remoting3&lt;/groupId&gt;
            &lt;artifactId&gt;jboss-remoting&lt;/artifactId&gt;
            &lt;version&gt;3.2.2.GA&lt;/version&gt;
            &lt;scope&gt;runtime&lt;/scope&gt;
        &lt;/dependency&gt;

        &lt;!-- Remote EJB accesses can be secured --&gt;
        &lt;dependency&gt;
            &lt;groupId&gt;org.jboss.sasl&lt;/groupId&gt;
            &lt;artifactId&gt;jboss-sasl&lt;/artifactId&gt;
            &lt;version&gt;1.0.0.Final&lt;/version&gt;
        &lt;/dependency&gt;

        &lt;!-- data serialization for invoking remote EJBs --&gt;
        &lt;dependency&gt;
            &lt;groupId&gt;org.jboss.marshalling&lt;/groupId&gt;
            &lt;artifactId&gt;jboss-marshalling-river&lt;/artifactId&gt;
            &lt;version&gt;1.3.9.GA&lt;/version&gt;
            &lt;scope&gt;runtime&lt;/scope&gt;
        &lt;/dependency&gt;

        &lt;!-- jboss-ejb-client的依赖很重要，而且版本一定要对 --&gt;
        &lt;dependency&gt;
            &lt;groupId&gt;org.jboss&lt;/groupId&gt;
            &lt;artifactId&gt;jboss-ejb-client&lt;/artifactId&gt;
            &lt;version&gt;1.0.5.Final&lt;/version&gt;
        &lt;/dependency&gt;

        &lt;dependency&gt;
            &lt;groupId&gt;org.yli.learn10&lt;/groupId&gt;
            &lt;artifactId&gt;server-side&lt;/artifactId&gt;
            &lt;version&gt;${project.version}&lt;/version&gt;
        &lt;/dependency&gt;

    &lt;/dependencies&gt;

    &lt;build&gt;
        &lt;plugins&gt;

            &lt;plugin&gt;
                &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt;
                &lt;version&gt;2.3.1&lt;/version&gt;
                &lt;configuration&gt;
                    &lt;source&gt;1.6&lt;/source&gt;
                    &lt;target&gt;1.6&lt;/target&gt;
                &lt;/configuration&gt;
            &lt;/plugin&gt;

            &lt;plugin&gt;
                &lt;groupId&gt;org.codehaus.mojo&lt;/groupId&gt;
                &lt;artifactId&gt;exec-maven-plugin&lt;/artifactId&gt;
                &lt;version&gt;1.2.1&lt;/version&gt;
                &lt;executions&gt;
                    &lt;execution&gt;
                        &lt;goals&gt;
                            &lt;goal&gt;exec&lt;/goal&gt;
                        &lt;/goals&gt;
                    &lt;/execution&gt;
                &lt;/executions&gt;
                &lt;configuration&gt;
                    &lt;executable&gt;java&lt;/executable&gt;
                    &lt;workingDirectory&gt;${project.build.directory}/exec-working-directory&lt;/workingDirectory&gt;
                    &lt;arguments&gt;
                        &lt;!-- automatically creates the classpath using all project dependencies,
                                             also adding the project build directory --&gt;
                        &lt;argument&gt;-classpath&lt;/argument&gt;
                        &lt;classpath&gt;
                        &lt;/classpath&gt;
                        &lt;argument&gt;org.yli.learn.client.Client&lt;/argument&gt;
                    &lt;/arguments&gt;
                &lt;/configuration&gt;
            &lt;/plugin&gt;

            &lt;plugin&gt;
                &lt;artifactId&gt;maven-assembly-plugin&lt;/artifactId&gt;
                &lt;configuration&gt;
                    &lt;descriptorRefs&gt;
                        &lt;descriptorRef&gt;jar-with-dependencies&lt;/descriptorRef&gt;
                    &lt;/descriptorRefs&gt;
                    &lt;archive&gt;
                        &lt;manifest&gt;
                            &lt;mainClass&gt;org.yli.learn.client.Client&lt;/mainClass&gt;
                        &lt;/manifest&gt;
                    &lt;/archive&gt;
                &lt;/configuration&gt;
            &lt;/plugin&gt;
        &lt;/plugins&gt;
    &lt;/build&gt;
&lt;/project&gt;

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<?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">

<artifactId>client</artifactId>

<groupId>org.yli.learn10</groupId>

<name>JBoss AS Learn Client</name>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

</properties>

<groupId>org.jboss.spec</groupId>

<artifactId>jboss-javaee-6.0</artifactId>

<version>3.0.0.Final</version>

<scope>import</scope>

</dependency>

</dependencies>

</dependencyManagement>

<groupId>org.jboss.spec.javax.transaction</groupId>

<artifactId>jboss-transaction-api_1.1_spec</artifactId>

<scope>runtime</scope>

</dependency>

<groupId>org.jboss.spec.javax.ejb</groupId>

<artifactId>jboss-ejb-api_3.1_spec</artifactId>

<scope>runtime</scope>

</dependency>

<groupId>org.jboss.xnio</groupId>

<scope>runtime</scope>

</dependency>

<groupId>org.jboss.xnio</groupId>

<scope>runtime</scope>

</dependency>

<groupId>org.jboss.remoting3</groupId>

<artifactId>jboss-remoting</artifactId>

<scope>runtime</scope>

</dependency>

<groupId>org.jboss.sasl</groupId>

<artifactId>jboss-sasl</artifactId>

<version>1.0.0.Final</version>

</dependency>

<groupId>org.jboss.marshalling</groupId>

<artifactId>jboss-marshalling-river</artifactId>

<scope>runtime</scope>

</dependency>

<groupId>org.jboss</groupId>

<artifactId>jboss-ejb-client</artifactId>

<version>1.0.5.Final</version>

</dependency>

<groupId>org.yli.learn10</groupId>

<artifactId>server-side</artifactId>

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

</dependency>

</dependencies>

<build>

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

</configuration>

</plugin>

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

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

<goals>

</goals>

</execution>

</executions>

<workingDirectory>${project.build.directory}/exec-working-directory</workingDirectory>

<!-- automatically creates the classpath using all project dependencies,

also adding the project build directory -->

<argument>-classpath</argument>

</classpath>

<argument>org.yli.learn.client.Client</argument>

</arguments>

</configuration>

</plugin>

<artifactId>maven-assembly-plugin</artifactId>

<descriptorRef>jar-with-dependencies</descriptorRef>

</descriptorRefs>

<mainClass>org.yli.learn.client.Client</mainClass>

</manifest>

</archive>

</configuration>

</plugin>

</plugins>

</build>

</project>

然后你可以用mvn clean package来编译打包了。

很重要的一点，就是要添加一个properties文件。在src/main下面，建立一个resources的文件夹，然后在里面新建文件jboss-ejb-client.properties. 我这里使用的是一些默认的选项，具体文档在JBoss的Confluence里有介绍。

remote.connectionprovider.create.options.org.xnio.Options.SSL_ENABLED=false

remote.connections=default

remote.connection.default.host=localhost
remote.connection.default.port = 4447
remote.connection.default.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS=false

remote.connection.two.host=localhost
remote.connection.two.port = 4447
remote.connection.two.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS=false

# 后面两句非常重要！记得我之前要大家建立一个Jboss的用户吗？
remote.connection.default.username=abc
remote.connection.default.password=123456

remote.connectionprovider.create.options.org.xnio.Options.SSL_ENABLED=false

remote.connections=default

remote.connection.default.host=localhost

remote.connection.default.port = 4447

remote.connection.default.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS=false

remote.connection.two.host=localhost

remote.connection.two.port = 4447

remote.connection.two.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS=false

# 后面两句非常重要！记得我之前要大家建立一个Jboss的用户吗？

remote.connection.default.username=abc

remote.connection.default.password=123456

好了，可以用mvn exec:exec来运行了！

你可以顺利看到Hello, Jason!

真太不容易了！但现在的感觉很爽啊！ 😀

Month: 2012年4月

当使用Maven遇到”resolution will not be reattempted until the update interval of MyRepo has elapsed”的解决办法

JBoss+Maven+Cargo开发EJB的Hello World!

1. 工具的安装

Maven 3

JBoss AS

2. 写一个EJB的服务

3. EJB Bean的部署

4. EJB的Client

关于Perl语言基本知识的学习总结

变量

流程控制

条件控制

循环控制

函数

包（Package）

总结

又要去“拥抱变化”了！