我尝试使用 EJB 和 WAR 创建 EAR 项目,但遇到一些问题。 我从 Java EE 6 EAR Archetype 创建了主项目:
<dependency>
<groupId>org.codehaus.mojo.archetypes</groupId>
<artifactId>ear-javaee6</artifactId>
<version>1.5</version>
</dependency>
然后我从 Java EE 6 EJB JAR Archetype 创建了 EJB 模块:
<dependency>
<groupId>org.codehaus.mojo.archetypes</groupId>
<artifactId>ejb-javaee6</artifactId>
<version>1.5</version>
</dependency>
然后我从 Javax Faces WAR Archetype 创建了第二个模块:
<dependency>
<groupId>javax.faces</groupId>
<artifactId>javax.faces-war-archetype</artifactId>
<version>2.2</version>
</dependency>
然后我将依赖项添加到主 pom.xml 中:
<!-- Define the versions of your ear components here -->
<dependencies>
<dependency>
<groupId>QCforCC-main</groupId>
<artifactId>QCforCC-ejb</artifactId>
<version>1.0-SNAPSHOT</version>
<type>ejb</type>
</dependency>
<dependency>
<groupId>QCforCC-main</groupId>
<artifactId>QCforCC-war</artifactId>
<version>1.0-SNAPSHOT</version>
<type>war</type>
</dependency>
</dependencies>
然后我尝试使用 maven clean 和 install 来构建项目。 但我有一个错误:
[ERROR] The projects in the reactor contain a cyclic reference: Edge between 'Vertex{label='QCforCC-main:QCforCC-war:1.0-SNAPSHOT'}' and 'Vertex{label='QCforCC-main:QCforCC-ejb:1.0-SNAPSHOT'}' introduces to cycle in the graph QCforCC-main:QCforCC-ejb:1.0-SNAPSHOT --> QCforCC-main:QCforCC-war:1.0-SNAPSHOT --> QCforCC-main:QCforCC-ejb:1.0-SNAPSHOT - [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectCycleException
Process finished with exit code 1
在 EAR 中 pom.xml
我有:
<modules>
<module>QCforCC-ejb</module>
<module>QCforCC-war</module>
</modules>
<packaging>pom</packaging>
但是如果我改变<packaging>pom</packaging>
至<packaging>ear</packaging>
IDEA 在弹出窗口中显示错误:
Some problems were encountered while processing the POMs:
[WARNING] 'build.plugins.plugin.(groupId:artifactId)' must be unique but found duplicate declaration of plugin org.apache.maven.plugins:maven-ear-plugin @ line 41, column 21
[ERROR] 'packaging' with value 'ear' is invalid. Aggregator projects require 'pom' as packaging. @ line 12, column 16
最佳答案
我强烈建议您了解多模块构建的工作原理。 Sonatype 书有一个很棒的 chapter描述的很详细。
要使用 EJB 和 WAR 构建 EAR,您实际上需要三个 模块,分别用于 EJB、WAR 和 EAR。父 POM 将所有内容组合在一起,并具有 POM 包装类型。
因此父 pom.xml 应该如下所示:
<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>
<groupId>org.sonatype.mavenbook.multi</groupId>
<artifactId>simple-parent</artifactId>
<packaging>pom</packaging>
<version>1.0</version>
<name>Multi Chapter Simple Parent Project</name>
<modules>
<module>ejb-module</module>
<module>war-module</module>
<module>ear-module</module>
</modules>
</project>
然后,每个子 POM 将如下所示:
ejb-module/pom.xml:
<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>
<parent>
<groupId>org.sonatype.mavenbook.multi</groupId>
<artifactId>simple-parent</artifactId>
<version>1.0</version>
</parent>
<artifactId>ejb-module</artifactId>
<packaging>ejb</packaging>
</project>
war-module/pom.xml
<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>
<parent>
<groupId>org.sonatype.mavenbook.multi</groupId>
<artifactId>simple-parent</artifactId>
<version>1.0</version>
</parent>
<artifactId>war-module</artifactId>
<packaging>war</packaging>
<name>simple-webapp Maven Webapp</name>
<dependencies>
<dependency>
<groupId>org.sonatype.mavenbook.multi</groupId>
<artifactId>ejb-module</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
</project>
ear-module/pom.xml:
<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>
<parent>
<groupId>org.sonatype.mavenbook.multi</groupId>
<artifactId>simple-parent</artifactId>
<version>1.0</version>
</parent>
<artifactId>ear-module</artifactId>
<packaging>ear</packaging>
<name>EAR module</name>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-ear-plugin</artifactId>
<version>2.10.1</version>
<configuration>
<ejbModule>
<groupId>org.sonatype.mavenbook.multi</groupId>
<artifactId>ejb-module</artifactId>
<bundleFilename>ejb-module.jar</bundleFilename>
</ejbModule>
<webModule>
<groupId>org.sonatype.mavenbook.multi</groupId>
<artifactId>war-module</artifactId>
<contextRoot>/foo</contextRoot>
</webModule>
</configuration>
</plugin>
</plugins>
</build>
</project>
关于maven - 如何使用 Maven 构建带有 EJB 和 WAR 的 EAR 项目?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32990664/