在 ubuntu 18.04 中安裝 OpenJDK OpenJ9 后，我丟失了可執行文件

Question

我最近從https://launchpad.net/~rpardini/+archive/ubuntu/adoptopenjdk在我的 Ubuntu 18.04 機器上安裝了 OpenJ9 jvm 並在我的終端中收到了這個通知：

    ** 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.

我試過運行 Spring Tool Suit，到目前為止沒有出現問題。

我應該擔心這個嗎？ 如果我能做些什么來修復這些丟失的文件，請教我。 我對 jvm 的工作原理知之甚少。 先感謝您。

Answer 1

除非您需要 jinfo、jstat 或 jstatd，否則您可以安全地忽略來自 update-alternatives 的那些警告（OpenJ9 不提供這些命令）。 我打開了一個問題 [1] 建議手冊頁應該只包含在提供的命令中。

請注意，在較新版本的 OpenJ9 中添加了 jcmd 和 jmap。

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