基本分析：
mvn dependency:analyze

可能出现类似这样的信息
[INFO] [dependency:analyze]
[WARNING] Used undeclared dependencies found:
[WARNING] org.sonatype.mavenbook.ch08:simple-model:jar:1.0:compile
未申明依赖，比如当我们依赖于hibernate，会同时依赖slflog，但是我们并没有显示的申明依赖，而是因为hibernate被动的依赖。建议每个依赖都要进行申明式依赖
[WARNING] Unused declared dependencies found:
[WARNING] org.apache.velocity:velocity:jar:1.5:compile
[WARNING] javax.servlet:jstl:jar:1.1.2:compile
[WARNING] taglibs:standard:jar:1.1.2:compile
[WARNING] junit:junit:jar:3.8.1:test


dependency:tree
这个目标更加直观的，以树结构显示
[INFO] [dependency:tree]
[INFO] org.sonatype.mavenbook.ch08:simple-model:jar:1.0
[INFO] +- org.hibernate:hibernate-annotations:jar:3.3.0.ga:compile
如这里的javax.persistence:persistence-api（\-）标志，表示非申明式引入。

[INFO] | \- javax.persistence:persistence-api:jar:1.0:compile
[INFO] +- org.hibernate:hibernate:jar:3.2.5.ga:compile
[INFO] | +- net.sf.ehcache:ehcache:jar:1.2.3:compile
[INFO] | +- commons-logging:commons-logging:jar:1.0.4:compile
[INFO] | +- asm:asm-attrs:jar:1.5.3:compile
[INFO] | +- dom4j:dom4j:jar:1.6.1:compile
[INFO] | +- antlr:antlr:jar:2.7.6:compile
[INFO] | +- cglib:cglib:jar:2.1_3:compile
[INFO] | +- asm:asm:jar:1.5.3:compile
[INFO] | \- commons-collections:commons-collections:jar:2.1.1:compile
[INFO] \- junit:junit:jar:3.8.1:test