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I am running a Centos7 system for Tomcat. Everything was working properly using Tomcat 8.5 and OpenJDK but the dev wants to use Oracle JDK. So, I yum autoremove the JDK files and then downloaded the RPMs from Oracle for JDK-9.0.1 and JRE-9.0.1. Right now, I can't seem to get Tomcat working again.

● tomcat.service - Apache Tomcat Web Application Container
Loaded: loaded (/etc/systemd/system/tomcat.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Wed 2017-10-18 11:33:07 PDT; 10s ago
Process: 6525 ExecStop=/bin/kill -15 $MAINPID (code=exited, status=1/FAILURE)
Process: 6513 ExecStart=/opt/tomcat/bin/startup.sh (code=exited, status=0/SUCCESS)
Main PID: 1055 (code=exited, status=143)

Oct 18 11:33:07 tomcat_base1 systemd[1]: Starting Apache Tomcat Web Application Container...
Oct 18 11:33:07 tomcat_base1 startup.sh[6513]: Existing PID file found during start.
Oct 18 11:33:07 tomcat_base1 startup.sh[6513]: Removing/clearing stale PID file.
Oct 18 11:33:07 tomcat_base1 systemd[1]: tomcat.service: control process exited, code=exited status=1
Oct 18 11:33:07 tomcat_base1 systemd[1]: Failed to start Apache Tomcat Web Application Container.
Oct 18 11:33:07 tomcat_base1 systemd[1]: Unit tomcat.service entered failed state.
Oct 18 11:33:07 tomcat_base1 systemd[1]: tomcat.service failed.

It looks like the new Java installed properly:

java 9.0.1
Java(TM) SE Runtime Environment (build 9.0.1+11)
Java HotSpot(TM) 64-Bit Server VM (build 9.0.1+11, mixed mode)
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I'd suggest you a robust way of binding Tomcat to specific version of JDK. Under tomcat_location_dir/bin subdir you can find setenv.sh file. Modify it by adding line:

JAVA_HOME=/path/to/desired/jdk_home

Then (re)start tomcat service. This will only affect this instance of tomcat. BTW that's the recommended way of setup specific tomcat environment.

Important: make sure you have JDK version not just JRE if in doubt doubt, just download the suitable tar/zip from http://www.oracle.com/technetwork/java/javase/downloads/jdk9-downloads-3848520.html then unpack it to /path/to/desired/jdk_home mentioned above

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