[02/16/18 18:15:19] [SSH] Checking java version of java
[02/16/18 18:15:19] [SSH] java -version returned 1.7.0_80.
[02/16/18 18:15:19] [SSH] Checking java version of /usr/bin/java
[02/16/18 18:15:19] [SSH] /usr/bin/java -version returned 1.7.0_80.
[02/16/18 18:15:19] [SSH] Checking java version of /usr/java/default/bin/java
[02/16/18 18:15:19] [SSH] /usr/java/default/bin/java -version returned 1.7.0_80.
[02/16/18 18:15:19] [SSH] Checking java version of /usr/java/latest/bin/java
[02/16/18 18:15:20] [SSH] /usr/java/latest/bin/java -version returned 1.7.0_80.
[02/16/18 18:15:20] [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

[02/16/18 18:15:20] [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

[02/16/18 18:15:20] [SSH] Checking java version of /var/lib/jenkins/jdk/bin/java
Couldn't figure out the Java version of /var/lib/jenkins/jdk/bin/java
bash: /var/lib/jenkins/jdk/bin/java: No such file or directory

Linux f3130c658338 3.10.0-514.21.2.el7.x86_64 #1 SMP Tue Jun 20 12:24:47 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
java.io.IOException: Could not find any known supported java version in [java, /usr/bin/java, /usr/java/default/bin/java, /usr/java/latest/bin/java, /usr/local/bin/java, /usr/local/java/bin/java, /var/lib/jenkins/jdk/bin/java], and we also failed to install JDK as a fallback
	at hudson.plugins.sshslaves.SSHLauncher.resolveJava(SSHLauncher.java:943)
	at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:826)
	at hudson.plugins.sshslaves.SSHLauncher$2.call(SSHLauncher.java:810)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
...
...