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我最近从https://launchpad.net/~rpardini/+archive/ubuntu/adoptopenjdk在我的 Ubuntu 18.04 机器上安装了 OpenJ9 jvm，并在我的终端中收到了以下通知：

    ** Missing executable /usr/lib/jvm/adoptopenjdk-11-jdk- 
    openj9/bin/jcmd even though man page /usr/lib/jvm/adoptopenjdk- 
    11-jdk-openj9/man/man1/jcmd.1.gz exists.
    ** This is probably a bug in AdoptOpenJDK and should be reported 
    upstream.
    ** Missing executable /usr/lib/jvm/adoptopenjdk-11-jdk- 
    openj9/bin/jinfo even though man page /usr/lib/jvm/adoptopenjdk- 
    11-jdk-openj9/man/man1/jinfo.1.gz exists.
    ** This is probably a bug in AdoptOpenJDK and should be reported 
    upstream.
    ** Missing executable /usr/lib/jvm/adoptopenjdk-11-jdk-                                
    openj9/bin/jmap even though man page /usr/lib/jvm/adoptopenjdk- 
    11-jdk-openj9/man/man1/jmap.1.gz exists.
    ** This is probably a bug in AdoptOpenJDK and should be reported 
    upstream.
    ** Missing executable /usr/lib/jvm/adoptopenjdk-11-jdk-                                                                                                                                                                                                                                                                                
    openj9/bin/jstat even though man page /usr/lib/jvm/adoptopenjdk- 
    11-jdk-openj9/man/man1/jstat.1.gz exists.
    ** This is probably a bug in AdoptOpenJDK and should be reported 
    upstream.
    ** Missing executable /usr/lib/jvm/adoptopenjdk-11-jdk- 
    openj9/bin/jstatd even though man page 
    /usr/lib/jvm/adoptopenjdk-11-jdk-openj9/man/man1/jstatd.1.gz 
    exists.
    ** This is probably a bug in AdoptOpenJDK and should be reported 
    upstream.

我试过运行 Spring Tool Suite，到目前为止没有出现任何问题。

我应该担心这个吗？如果我能做些什么来修复这些丢失的文件，请教我。我对 jvm 的工作原理知之甚少。先感谢您。

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1 回答 1

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除非您需要 jinfo、jstat 或 jstatd，否则您可以放心地忽略来自 update-alternatives 的警告（OpenJ9 不提供这些命令）。我打开了一个问题 [1]，建议仅应为提供的命令包含手册页。

请注意，jcmd 和 jmap 已添加到 OpenJ9 的更新版本中。

[1] https://github.com/eclipse/openj9/issues/8732

于 2020-03-03T17:03:23.397 回答