tomcat故障合集

WEB集群-tomcat集群部署zrlog博客之后重启机器显示404

故障现象：👆

排查过程：

检查tomcat运行情况：（systemctl + 进程）

[root@sp3-web03 /app/tools/tomcat]# systemctl status tomcat
● tomcat.service - Tomcat java web container
   Loaded: loaded (/usr/lib/systemd/system/tomcat.service; enabled; vendor preset: disabled)
   Active: active (running) since Sun 2025-09-14 10:01:28 CST; 5h 13min ago
  Process: 729 ExecStart=/app/tools/tomcat/bin/startup.sh (code=exited, status=0/SUCCESS)
 Main PID: 779 (java)
    Tasks: 28
   Memory: 165.7M
   CGroup: /system.slice/tomcat.service
           └─779 /usr/bin/java -Djava.util.logging.config.file=/app/tools/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLo>
​
9月 14 10:01:28 sp3-web03 systemd[1]: Starting Tomcat java web container...
9月 14 10:01:28 sp3-web03 startup.sh[729]: Tomcat started.
9月 14 10:01:28 sp3-web03 systemd[1]: Started Tomcat java web container.
[root@sp3-web03 /app/tools/tomcat]# ps -ef | grep java 
root         779       1  0 11:36 ?        00:00:19 /usr/bin/java -Djava.util.logging.config.file=/app/tools/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.protocol.handler.pkgs=org.apache.catalina.webresources -Dorg.apache.catalina.security.SecurityListener.UMASK=0027 -Dignore.endorsed.dirs= -classpath /app/tools/tomcat/bin/bootstrap.jar:/app/tools/tomcat/bin/tomcat-juli.jar -Dcatalina.base=/app/tools/tomcat -Dcatalina.home=/app/tools/tomcat -Djava.io.tmpdir=/app/tools/tomcat/temp org.apache.catalina.startup.Bootstrap start
root        2536    2302  0 15:14 pts/1    00:00:00 grep java                                            
​

检查端口：

[root@sp3-web03 /app/tools/tomcat]# ss -tlnup | grep java
tcp    LISTEN  0       1         [::ffff:127.0.0.1]:8005                *:*      users:(("java",pid=779,fd=71))                                                 
tcp    LISTEN  0       100                        *:8080                *:*      users:(("java",pid=779,fd=57))     

没看到有什么问题：

重启tomcat

systemctl status tomcat

恢复：

故障原因：连不上远程数据库db01，强行停止了实例，11:37数据库服务器还没开

 14-Sep-2025 11:37:47.141 信息 [mysql-cj-abandoned-connection-cleanup] org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading 非法访问：此Web应用程序实例已停止。无法加载[]。为了调试以及终止导致非法访问的线程，将抛出以下堆栈跟踪。
    java.lang.IllegalStateException: 非法访问：此Web应用程序实例已停止。无法加载[]。为了调试以及终止导致非法访问的线程，将抛出以下堆栈跟踪。
        at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1392)
        at org.apache.catalina.loader.WebappClassLoaderBase.getResource(WebappClassLoaderBase.java:1045)
        at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.checkThreadContextClassLoader(AbandonedConnectionCleanupThread.java:117)
        at com.mysql.cj.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:84)
        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:750)

查看实例的mysql配置：zrlog数据库连接配置文件:

[root@web03 /app/tools/tomcat/webapps/ROOT]#   cat ./WEB-INF/db.properties

[root@sp3-web03 /app/tools/tomcat]# cat webapps/ROOT/./WEB-INF/db.properties
#This is a database configuration file
#Thu Sep 11 22:35:21 CST 2025
driverClass=com.mysql.cj.jdbc.Driver
user=zrlog
password=2
jdbcUrl=jdbc\:mysql\://10.0.0.51\:3306/zrlog?characterEncoding\=UTF-8&allowPublicKeyRetrieval\=true&useSSL\=false&serverTimezone\=GMT