Tomcat fails to be started due to class errors

Symptoms

• Non-Plesk Tomcat was previously installed, used and removed

• Plesk Tomcat was installed via Plesk > Tools & Settings > Updates and Upgrades > Add/Remove Components > Web hosting > Support for Tomcat Java Servlets > Continue

• Tomcat service cannot be started due to the following error:

  # service tomcat status

  ● tomcat.service – Apache Tomcat Web Application Container
  Active: failed (Result: exit-code) since Wed 2017-12-20 21:27:38 UTC; 6s ago

  ip-203-0-113-2.server.hostname server[1995]: at java.net.URLClassLoader$1.run(URLClassLoader.java:201)
  ip-203-0-113-2.server.hostname server[1995]: at java.security.AccessController.doPrivileged(Native Method)
  <..>
  ip-203-0-113-2.server.hostname server[1995]: at java.lang.ClassLoader.loadClass(ClassLoader.java:270)
  ip-203-0-113-2.server.hostname systemd[1]: tomcat.service: main process exited, code=exited, status=1/FAILURE
  ip-203-0-113-2.server.hostname systemd[1]: Unit tomcat.service entered failed state.
  ip-203-0-113-2.server.hostname systemd[1]: tomcat.service failed.

Cause

Files that contain required classes are missing.

Resolution

For CentOS:

1. Connect to the server via SSH;

2. Check the existence of the following files on the server:

   # ls -la /usr/share/tomcat/bin/bootstrap.jar
   -rw-r–r– 1 root tomcat 29207 Oct 30 17:22 /usr/share/tomcat/bin/bootstrap.jar

   # ls -la /usr/share/tomcat/bin/tomcat-juli.jar
   -rw-r–r– 1 root root 38548 Oct 30 17:22 /usr/share/tomcat/bin/tomcat-juli.jar

   # ls -la /usr/share/java/commons-daemon.jar
   -rw-r–r– 1 root root 23754 Jun 10 2014 /usr/share/java/commons-daemon.jar

3. If some of them are missing, download them from attachments and move to the required folders.