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執行mvn dependency:tree後，我得到了以下的輸出：爲什麼排除了Maven依賴關係？
[INFO] stpr:stpr:war:1.0
[INFO] +- org.jboss.spec:jboss-javaee-6.0:pom:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.annotation:jboss-annotations-api_1.1_spec:jar:
1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.resource:jboss-connector-api_1.5_spec:jar:1.0.
0.Final:provided
[INFO] | +- org.jboss.spec.javax.ejb:jboss-ejb-api_3.1_spec:jar:1.0.0.Final:pro
vided
[INFO] | | \- javax.xml:jaxrpc-api:jar:1.1:provided
[INFO] | +- org.jboss.spec.javax.el:jboss-el-api_2.2_spec:jar:1.0.0.Final:provi
ded
[INFO] | +- org.jboss.spec.javax.interceptor:jboss-interceptors-api_1.1_spec:ja
r:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.security.jacc:jboss-jacc-api_1.4_spec:jar:1.0.
0.Final:provided
[INFO] | +- org.jboss.spec.javax.enterprise.deploy:jboss-jad-api_1.2_spec:jar:1
.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.security.auth.message:jboss-jaspi-api_1.0_spec
:jar:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.xml.registry:jboss-jaxr-api_1.0_spec:jar:1.0.0
.Final:provided
[INFO] | +- org.jboss.spec.javax.jms:jboss-jms-api_1.1_spec:jar:1.0.0.Final:pro
vided
[INFO] | +- org.jboss.spec.javax.servlet.jsp:jboss-jsp-api_2.2_spec:jar:1.0.0.F
inal:provided
[INFO] | +- org.jboss.spec.javax.servlet:jboss-servlet-api_3.0_spec:jar:1.0.0.F
inal:provided
[INFO] | +- org.jboss.spec.javax.transaction:jboss-transaction-api_1.1_spec:jar
:1.0.0.Final:provided
[INFO] | +- org.jboss.spec.javax.xml.bind:jboss-jaxb-api_2.2_spec:jar:1.0.0.Fin
al:provided
[INFO] | +- org.jboss.spec.javax.xml.rpc:jboss-jaxrpc-api_1.1_spec:jar:1.0.0.Fi
nal:provided
[INFO] | +- org.jboss.spec.javax.xml.soap:jboss-saaj-api_1.3_spec:jar:1.0.0.Fin
al:provided
[INFO] | +- org.jboss.spec.javax.xml.ws:jboss-jaxws-api_2.2_spec:jar:1.0.0.Fina
l:provided
[INFO] | +- javax.activation:activation:jar:1.1:provided
[INFO] | +- javax.enterprise:cdi-api:jar:1.0-SP4:provided
[INFO] | +- com.sun.faces:jsf-api:jar:2.0.3-b05:provided
[INFO] | +- javax.inject:javax.inject:jar:1:provided
[INFO] | +- javax.jws:jsr181-api:jar:1.0-MR1:provided
[INFO] | +- javax.mail:mail:jar:1.4.2:provided
[INFO] | +- javax.servlet:jstl:jar:1.2:provided
[INFO] | +- org.hibernate.javax.persistence:hibernate-jpa-2.0-api:jar:1.0.0.Fin
al:provided
[INFO] | +- org.jboss.resteasy:jaxrs-api:jar:2.1.0.GA:provided
[INFO] | +- stax:stax-api:jar:1.0.1:provided
[INFO] | \- javax.validation:validation-api:jar:1.0.0.GA:provided
[INFO] \- javax.transaction:javax.transaction-api:jar:1.2-b03:compile
我的問題是，爲什麼javax.transaction-api:jar:1.2-b03:compile被排除在外？我沒有明確指定任何排除。怎麼了？
的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>
<groupId>gr</groupId>
<artifactId>ar</artifactId>
<packaging>war</packaging>
<version>1.0</version>
<name>nm</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.6</maven.compiler.source>
<maven.compiler.target>1.6</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.jboss.spec</groupId>
<artifactId>jboss-javaee-6.0</artifactId>
<version>1.0.0.Final</version>
<type>pom</type>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.transaction</groupId>
<artifactId>javax.transaction-api</artifactId>
<version>1.2-b03</version>
</dependency>
</dependencies>
<profiles>
<!-- profiles here -->
</profiles>
</project>