mvn 依赖：树并没有真正显示所有依赖项[重复]

Question

我在编译一个包含许多依赖项的 jar 时遇到了问题，特别是 snakeyaml 的重叠版本（我们需要 1.11，一些依赖项正在拉入 1.9）。我们运行了mvn dependency:tree，但我们没有在任何输出中看到有问题的次要版本。进一步检查，是jruby-complete，然后拉入snakeyaml。为什么mvn dependency:tree 没有向我们展示这一级别的向下钻取：

[INFO] |     |  +- org.apache.hbase:hbase-it:jar:0.98.6-cdh5.2.5:compile
[INFO] |     |  |  +- (org.apache.hbase:hbase-common:jar:0.98.6-cdh5.2.5:compile - omitted for duplicate)
[INFO] |     |  |  +- (org.apache.hbase:hbase-protocol:jar:0.98.6-cdh5.2.5:compile - omitted for duplicate)
[INFO] |     |  |  +- (org.apache.hbase:hbase-client:jar:0.98.6-cdh5.2.5:compile - omitted for duplicate)
[INFO] |     |  |  +- org.apache.hbase:hbase-shell:jar:0.98.6-cdh5.2.5:compile
[INFO] |     |  |  |  +- (org.apache.hbase:hbase-common:jar:0.98.6-cdh5.2.5:compile - omitted for duplicate)
[INFO] |     |  |  |  +- (org.apache.hbase:hbase-protocol:jar:0.98.6-cdh5.2.5:compile - omitted for duplicate)
[INFO] |     |  |  |  +- (org.apache.hbase:hbase-client:jar:0.98.6-cdh5.2.5:compile - omitted for duplicate)
[INFO] |     |  |  |  +- (org.apache.hbase:hbase-prefix-tree:jar:0.98.6-cdh5.2.5:runtime - omitted for duplicate)
[INFO] |     |  |  |  +- (org.apache.hbase:hbase-server:jar:0.98.6-cdh5.2.5:compile - omitted for duplicate)
[INFO] |     |  |  |  +- (org.apache.hbase:hbase-hadoop-compat:jar:0.98.6-cdh5.2.5:compile - omitted for duplicate)
[INFO] |     |  |  |  +- (org.apache.hbase:hbase-hadoop2-compat:jar:0.98.6-cdh5.2.5:compile - omitted for duplicate)
[INFO] |     |  |  |  +- (com.yammer.metrics:metrics-core:jar:2.2.0:compile - omitted for duplicate)
[INFO] |     |  |  |  +- (commons-logging:commons-logging:jar:1.1.1:compile - omitted for conflict with 1.2)
[INFO] |     |  |  |  +- org.jruby:jruby-complete:jar:1.6.8:compile
                              >>>>>>> WHY ARE THERE NO DEPENDENCIES HERE? >>>>>>>>>
[INFO] |     |  |  |  +- (org.cloudera.htrace:htrace-core:jar:2.04:compile - omitted for duplicate)
[INFO] |     |  |  |  +- (org.apache.hadoop:hadoop-common:jar:2.5.0-cdh5.2.5:compile - omitted for duplicate)

为什么the dependencies of jruby-complete 没有在树中列出？ mvn dependency:tree 是否只有 gfo 到一定深度？这里有什么规则？如果mvn dependency:tree 简单地向我们展示了它的snakeyaml 依赖关系，我们可以节省几个小时的复杂调试时间。

Answer 1

我相信this forum topic 会回答你的问题。如果依赖关系已经存在于树中的较高级别，则依赖关系树 mojo 会修剪较低级别的依赖关系。这意味着所有 jruby-complete 的依赖项（如果有的话）都列在树中较浅的深度。您可以使用verbose flag (-Dverbose) 来显示省略的依赖项。