TOMCAT 关闭报错：Tomcat did not stop in time. PID file was not removed

# ./shutdown.sh 
Using CATALINA_BASE:   /opt/openkm-6.3.1-community/tomcat
Using CATALINA_HOME:   /opt/openkm-6.3.1-community/tomcat
Using CATALINA_TMPDIR: /opt/openkm-6.3.1-community/tomcat/temp
Using JRE_HOME:        /opt/openkm-6.3.1-community/java
Using CLASSPATH:       /opt/openkm-6.3.1-community/tomcat/bin/bootstrap.jar:/opt/openkm-6.3.1-community/tomcat/bin/tomcat-juli.jar
Using CATALINA_PID:    /opt/openkm-6.3.1-community/tomcat/catalina.pid
Tomcat did not stop in time. PID file was not removed. To aid diagnostics a thread dump has been written to standard out.
# 
# ./shutdown.sh 
Us