seam 属性配置与installed="false"的冲突
问题
在测试和运行环境使用不同的事务配置，默认不需要指定事务（使用jta），测试时需要使用jpa 事务，这时就必须在components.xml中显示配置jpa事务，如果测试和运行时都使用同一components.xml，可以通过maven属性控制
transaction:entity-transaction组件的installed。
<transaction:entity-transaction entity-manager="#{entityManager}" installed="${entity-transaction.installed}"></transaction:entity-transaction>
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在web-inf\components.xml中配置的组件即使installed="false"，它里面的属性也会被使用。
如下配置指定了默认的seam事务(org.jboss.seam.transaction.Transaction类，不是。。EntityTransaction类），当创建Transaction类实例后会把entity-manager属性向实例中反射设置，这样会抛出Transaction类没有entityManager属性的异常。
<transaction:entity-transaction entity-manager="#{entityManager}" installed="false"></transaction:entity-transaction>
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解决生成两个不同环境的components.xml文件，一个中定义entity-transaction，一个中不定义，这样就不会把不可用组件的属性使用了。
<transaction:entity-transaction entity-manager="#{entityManager}" ></transaction:entity-transaction>
要解决如何指定使用哪个components.xml文件。
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在src/main/下建立webapptest文件夹下面只建立WEB-INF/components.xml
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<plugin>
??? ??? ??? ??? ??? ??? <groupId>org.apache.maven.plugins</groupId>
??? ??? ??? ??? ??? ??? <artifactId>maven-war-plugin</artifactId>
??? ??? ??? ??? ??? ??? <configuration>
??? ??? ??? ??? ??? ??? ??? <webResources>
??? ??? ??? ??? ??? ??? ??? ??? <resource>
??? ??? ??? ??? ??? ??? ??? ??? ??? <!-- this is relative to the pom.xml directory -->
??? ??? ??? ??? ??? ??? ??? ??? ??? <directory>src/main/webapp</directory>
??? ??? ??? ??? ??? ??? ??? ??? ??? <filtering>true</filtering>
??? ??? ??? ??? ??? ??? ??? ??? ??? <includes>
??? ??? ??? ??? ??? ??? ??? ??? ??? ??? <include>**/web.xml</include>
??? ??? ??? ??? ??? ??? ??? ??? ??? ??? <include>**/footer.xhtml</include>
??? ??? ??? ??? ??? ??? ??? ??? ??? </includes>
??? ??? ??????? ??? ??? ??? ??? ??? <excludes>
??? ??? ??????? ??? ??? ??? ??? ??? ??? <exclude>**/*.scc</exclude>
??? ??? ??????? ??? ??? ??? ??? ??? </excludes>
??? ??? ??? ??? ??? ??? ??? ??? </resource>
??? ??? ??? ??? ??? ??? ??? ??? <resource>
??? ??? ??? ??? ??? ??? ??? ??? ??? <!-- this is relative to the pom.xml directory -->
??? ??? ??? ??? ??? ??? ??? ??? ??? <directory>src/main/webapptest</directory>
??? ??? ??? ??? ??? ??? ??? ??? ??? <filtering>true</filtering>
??? ??? ??? ??? ??? ??? ??? ??? ??? <includes>
??? ??? ??? ??? ??? ??? ??? ??? ??? ??? <include>**/components.xml</include>
??? ??? ??? ??? ??? ??? ??? ??? ??? </includes>
??? ??? ??????? ??? ??? ??? ??? ??? <excludes>
??? ??? ??????? ??? ??? ??? ??? ??? ??? <exclude>**/*.scc</exclude>
??? ??? ??????? ??? ??? ??? ??? ??? </excludes>
??? ??? ??? ??? ??? ??? ??? ??? </resource>
??? ??? ??? ??? ??? ??? ??? </webResources>
??? ??? ??? ??? ??? ??? </configuration>
??? ??? ??? ??? ??? </plugin>
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