我试图配置pom.xml文件为我Spring 3和Hibernate 3.6应用。相关部分pom.xml如下所示：

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.9</version>
    </dependency>

    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>3.6.3.Final</version>
    </dependency>
    <dependency>
        <groupId>org.javassist</groupId>
        <artifactId>javassist</artifactId>
        <version>3.17.1-GA</version>
    </dependency>
    <dependency>
        <groupId>asm</groupId>
        <artifactId>asm-all</artifactId>
        <version>2.2</version>
    </dependency>
    <dependency>
        <groupId>antlr</groupId>
        <artifactId>antlr</artifactId>
        <version>2.7.7</version>
    </dependency>

但是，如果我不将javassist.jar库直接包含到我的buildpath中External jar，我会不断获取java.lang.ClassNotFoundException。我有什么问题pom.xml吗，因为在构建项目时不会下载此依赖项？