创建EJB bean - Removable

package pl.jaceklaskowski.javaee;

import javax.ejb.Remote;

@Remote

public interface RemovableRemote {

   public void remove(String message);

}

package pl.jaceklaskowski.javaee;

import javax.ejb.Stateless;

@Stateless(mappedName="Removable")

public class RemovableBean implements RemovableRemote {

    public void remove(String msg) {

        System.out.println(msg);

    }

}

创建远程客户机——RemovableClient

根据GlassFish——How do I access a Remote EJB from a stand-alone java client?中针对bean操作的远程访问说明，我们将创建RemovableClient 。

首先，我们将通过Libraries > Add Library...定义子项目ejb3-remove-stateless-ejb3（客户机将使用这个子项目类别） 的依赖关系。

添加了依赖关系后，您将在本地库中看到一条错误消息，表示依赖关系是无效的。

（单击查看大图）

要解决这个问题，我们需要构建一个EJB bean——也就是Removable，构建ejb3-remove-stateless-ejb3 项目，然后将库放入m2本地库中。构建方法为选择ejb3-remove-stateless-ejb3 项目，右键单击鼠标并从下拉菜单中选择Build选项。

正确执行这个命令并重新加载ejb3-remove-stateless-client客户机项目（菜单Reload Project）将解决这一问题。

下一步是创建客户机类——pl.jaceklaskowski.javaee.RemovableClient。这一步非常的简单，因此不多做说明。客户机的简单性源于GlassFish库——appserv-rt.jar，其中包含了JNDI配置。我们还需注意如何使用EJB bean的名称——Removable——它是通过@Stateless annotation mappedName属性在bean类别中定义的。

package pl.jaceklaskowski.javaee;

import javax.naming.Context;

import javax.naming.InitialContext;

public class RemovableClient {

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

        Context ctx = new InitialContext();

        RemovableRemote removable = (RemovableRemote) ctx.lookup("Removable");

        removable.remove("Look at the server's log");

    }

}

这时，我们需要添加项目依赖关系，即属于GlassFish服务器——appserv-rt.jar的库以及system中的javaee.jar system（根据System Dependencies）。通过变量glassfish.home查看安装GlassFish的文件系统的依赖关系，默认位置为c:/apps/glassfish。

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

<project>

    <parent>

        <artifactId>ejb3-remove-stateless</artifactId>

        <groupId>pl.jaceklaskowski.javaee</groupId>

        <version>1.0</version>

    </parent>

    <modelVersion>4.0.0</modelVersion>

    <groupId>pl.jaceklaskowski.javaee</groupId>

    <artifactId>ejb3-remove-stateless-client</artifactId>

    <name>ejb3-remove-stateless-client</name>

    <version>1.0</version>

    <properties>

        <glassfish.home>c:/apps/glassfish</glassfish.home>

    </properties>

    <dependencies>

        <dependency>

            <groupId>glassfish</groupId>

            <artifactId>appserv-rt.jar</artifactId>

            <version>LATEST</version>

            <scope>system</scope>

            <systemPath>${glassfish.home}/lib/appserv-rt.jar</systemPath>

        </dependency>

        <dependency>

            <groupId>glassfish</groupId>

            <artifactId>javaee.jar</artifactId>

            <version>LATEST</version>

            <scope>system</scope>

            <systemPath>${glassfish.home}/lib/javaee.jar</systemPath>

        </dependency>

        <dependency>

            <groupId>pl.jaceklaskowski.javaee</groupId>

            <artifactId>ejb3-remove-stateless-ejb3</artifactId>

            <version>1.0</version>

        </dependency>

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.2</version>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

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

                <artifactId>maven-surefire-plugin</artifactId>

                <configuration>

                    <includes>

                        <include>none</include>

                    </includes>

                </configuration>

                <executions>

                    <execution>

                        <id>run RemovableClientTest</id>

                        <phase>integration-test</phase>

                        <configuration>

                            <includes>

                                <include>**/RemovableClientTest.java</include>

                            </includes>

                        </configuration>

                        <goals>

                            <goal>test</goal>

                        </goals>

                    </execution>

                </executions>

            </plugin>

        </plugins>

    </build>

</project>

模块配置的一个有趣的部分是maven-surefire-plugin的配置，默认情况下它只执行符合none模式的测试，以这种方式进行配置（在本例中none模式意味着不会执行任何测试，因为所有测试都不符合模式，但是执行单个的RemovableClientTest会更加准确），并且只在完成集成测试阶段期间执行。

不管客户机类的可访问性如何，我们将从m2级别执行自动启动，此过程需要借助一个测试——RemovableClientTest（pl.jaceklaskowski.javaee.RemovableClientTest 类别），该测试是通过Test Packages文件夹构建的。

package pl.jaceklaskowski.javaee;

import javax.naming.Context;

import javax.naming.InitialContext;

import org.junit.Test;

public class RemovableClientTest {

    @Test

    public void runRemoteClient() throws Exception {

        Context ctx = new InitialContext();

        RemovableRemote removable = (RemovableRemote) ctx.lookup("Removable");

        removable.remove("Look at the server's log");

    }

}

这种类型的测试在默认情况下不会启动（请参考pom.xml文件中的maven-surefire-plugin配置），因为在启动测试之前，需要在GlassFish应用服务器上先启动bean（如果修改了测试实现方式，则不能够创建项目并且也不能在服务器上安装bean）。

启动

要启动项目，首先要在GlassFish服务器上安装Removable bean ，然后启动RemovableClientTest。

$ asadmin.bat start-domain domain1

Starting Domain domain1, please wait.

Log redirected to c:\apps\glassfish\domains\domain1\logs\server.log.

Redirecting output to C:/apps/glassfish/domains/domain1/logs/server.log

Domain domain1 is ready to receive client requests. Additional services are being started in background.

Domain [domain1] is running [Sun Java System Application Server 9.1 (build b58d-fcs)]

with its configuration and logs at: [c:\apps\glassfish\domains].

Admin Console is available at [http://localhost:4848].

Use the same port [4848] for "asadmin" commands.

User web applications are available at these URLs:

[http://localhost:8080 https://localhost:8181 ].

Following web-contexts are available:

[/web1  /__wstx-services ].

Standard JMX Clients (like JConsole) can connect to JMXServiceURL:

[service:jmx:rmi:///jndi/rmi://dev:8686/jmxrmi] for domain management purposes.

Domain listens on at least following ports for connections:

[8080 8181 4848 3700 3820 3920 8686 ].

Domain does not support application server clusters and other standalone instances.

$ asadmin.bat deploy --user admin ejb3-remove-stateless-ejb3/target/ejb3-remove-stateless-ejb3-1.0.jar

Command deploy executed successfully.

...

------------------------------------------------------------------------

Reactor Summary:

------------------------------------------------------------------------

ejb3-remove-stateless ................................. SUCCESS [1.500s]

ejb3-remove-stateless-ejb3 ............................ SUCCESS [0.610s]

ejb3-remove-stateless-client .......................... SUCCESS [0.921s]

------------------------------------------------------------------------

------------------------------------------------------------------------

BUILD SUCCESSFUL

------------------------------------------------------------------------

...

...

-------------------------------------------------------

 T E S T S

-------------------------------------------------------

Running pl.jaceklaskowski.javaee.RemovableClientTest

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.203 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

------------------------------------------------------------------------

BUILD SUCCESSFUL

------------------------------------------------------------------------

...

[#|2007-09-03T22:41:59.750+0200|INFO|sun-appserver9.1|javax.enterprise.system.stream.out|_ThreadID=16;_ThreadName=p:

thread-pool-1; w: 8;|

Look at the server's log|#]

相关链接

• Tworzenie aplikacji EJB 3.0 z GlassFish v2, Apache Maven 2 i NetBeans IDE 6.0"（最初为波兰语文章）
• 作者Jacek Laskowski撰写的其他文章（波兰语）