[07/14/18?23:49:44]?[SSH]?Checking?java?version?of?java
Couldn't?figure?out?the?Java?version?of?java
bash:?java:?command?not?found

[07/14/18?23:49:44]?[SSH]?Checking?java?version?of?/usr/bin/java
Couldn't?figure?out?the?Java?version?of?/usr/bin/java
bash:?/usr/bin/java:?No?such?file?or?directory

[07/14/18?23:49:44]?[SSH]?Checking?java?version?of?/usr/java/default/bin/java
Couldn't?figure?out?the?Java?version?of?/usr/java/default/bin/java
bash:?/usr/java/default/bin/java:?No?such?file?or?directory

[07/14/18?23:49:45]?[SSH]?Checking?java?version?of?/usr/java/latest/bin/java
Couldn't?figure?out?the?Java?version?of?/usr/java/latest/bin/java
bash:?/usr/java/latest/bin/java:?No?such?file?or?directory

[07/14/18?23:49:45]?[SSH]?Checking?java?version?of?/usr/local/bin/java
Couldn't?figure?out?the?Java?version?of?/usr/local/bin/java
bash:?/usr/local/bin/java:?No?such?file?or?directory

[07/14/18?23:49:45]?[SSH]?Checking?java?version?of?/usr/local/java/bin/java
Couldn't?figure?out?the?Java?version?of?/usr/local/java/bin/java
bash:?/usr/local/java/bin/java:?No?such?file?or?directory

[07/14/18?23:49:45]?[SSH]?Checking?java?version?of?/root/.jenkins/jdk/bin/java
Couldn't?figure?out?the?Java?version?of?/root/.jenkins/jdk/bin/java
bash:?/root/.jenkins/jdk/bin/java:?No?such?file?or?directory

Linux?wxiaohui-ubuntu?4.4.0-31-generic?#50~14.04.1-Ubuntu?SMP?Wed?Jul?13?01:07:32?UTC?2016?x86_64?x86_64?x86_64?GNU/Linux
Installing?JDK?jdk-8u144-oth-JPR
Downloading?JDK?from?http://download.oracle.com/otn/java/jdk/8u144-b01/090f390dda5b47b9b721c7dfaa008135/jdk-8u144-linux-x64.tar.gzOracle?now?requires?Oracle?account?to?download?previous?versions?of?JDK.?Please?specify?your?Oracle?account?username/password.java.io.IOException:?Could?not?find?any?known?supported?java?version?(a?minimum?level?of?8?is?required)?in?[java,?/usr/bin/java,?/usr/java/default/bin/java,?/usr/java/latest/bin/java,?/usr/local/bin/java,?/usr/local/java/bin/java,?/root/.jenkins/jdk/bin/java],?and?we?also?failed?to?install?JDK?as?a?fallback
	at?hudson.plugins.sshslaves.SSHLauncher.resolveJava(SSHLauncher.java:954)
	at?hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:836)
	at?hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:820)
	at?java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at?java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at?java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at?java.lang.Thread.run(Thread.java:748)
Caused?by:?hudson.AbortException:?Unable?to?install?JDK?unless?a?valid?Oracle?account?username/password?is?provided?in?the?system?configuration.
	at?hudson.tools.JDKInstaller.locate(JDKInstaller.java:539)
	at?hudson.plugins.sshslaves.SSHLauncher.attemptToInstallJDK(SSHLauncher.java:1075)
	at?hudson.plugins.sshslaves.SSHLauncher.resolveJava(SSHLauncher.java:951)
	...?6?more
[07/14/18?23:49:48]?Launch?failed?-?cleaning?up?connection
[07/14/18?23:49:48]?[SSH]?連接關閉。

提示找不到 java 命令的錯誤， 但是我 linux 上的確安裝了 JDK 而且也配置了環境變量，任意目錄下都可以使用 java 命令，

root@wxiaohui-ubuntu:~# java -version

java version "1.8.0_171"

Java(TM) SE Runtime Environment (build 1.8.0_171-b11)

Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)

root@wxiaohui-ubuntu:~#?

不知道這里為什么會提示找不到 java

求解答