为什么Maven要浪费超过12秒的时间？

简单地说，我得到了这个结果

$ time mvn generate-sources ; date
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building connect-ui 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-antrun-plugin:1.8:run (default) @ connect-ui ---
[INFO] Executing tasks

<Ant task that does a copy followed by a search and replace.>

[INFO] Executed tasks
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.637 s
[INFO] Finished at: 2015-05-19T18:14:14+02:00
[INFO] Final Memory: 9M/311M
[INFO] ------------------------------------------------------------------------

real    0m13.057s
user    0m15.760s
sys 0m0.246s
Tue May 19 18:14:26 CEST 2015

    real    0m13.036s
    user    0m15.807s
    sys 0m0.292s

使用-X（或--debug）运行没有什么区别-Maven仍然说

构建成功

，然后有一段等待期（没有进一步的输出）

为了好玩，我还尝试了mvn清洁测试：

time mvn -X clean ; date
Apache Maven 3.2.3 (33f8c3e1027c3ddde99d3cdebad2656a31e8fdf4; 2014-08-11T22:58:10+02:00)
Maven home: /usr/local/Cellar/maven/3.2.3/libexec
Java version: 1.8.0_11, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.10.3", arch: "x86_64", family: "mac"
[INFO] Error stacktraces are turned on.
...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.299 s
[INFO] Finished at: 2015-05-19T18:22:44+02:00
[INFO] Final Memory: 7M/291M
[INFO] ------------------------------------------------------------------------

real    0m12.805s
user    0m14.739s
sys 0m0.196s
Tue May 19 18:22:56 CEST 2015

---

您是否尝试过在调试模式下运行，以获取有关它正在执行的操作的更多信息？我现在尝试过。没有区别。问题已更新。@ChristianJonassen额外的12秒是在Maven打印“构建成功”之前还是之后发生的？@matts它发生在之后。您能使用“strace”查看进程执行时到底发生了什么吗？

time mvn -X clean ; date
Apache Maven 3.2.3 (33f8c3e1027c3ddde99d3cdebad2656a31e8fdf4; 2014-08-11T22:58:10+02:00)
Maven home: /usr/local/Cellar/maven/3.2.3/libexec
Java version: 1.8.0_11, vendor: Oracle Corporation
Java home: /Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.10.3", arch: "x86_64", family: "mac"
[INFO] Error stacktraces are turned on.
...
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.299 s
[INFO] Finished at: 2015-05-19T18:22:44+02:00
[INFO] Final Memory: 7M/291M
[INFO] ------------------------------------------------------------------------

real    0m12.805s
user    0m14.739s
sys 0m0.196s
Tue May 19 18:22:56 CEST 2015