How to monitor Tomcat log exceptions

This article introduces several methods to monitor Tomcat log exceptions to help you discover and solve problems in a timely manner and ensure the stable operation of the application.

1. Use ELK stack to achieve centralized monitoring

It is recommended to use the ELK (Elasticsearch, Logstash, Kibana) stack for efficient log monitoring.

1. Data acquisition (Filebeat): Configure Filebeat to collect warning (WARN) and error (ERROR) levels in Tomcat log files (such as catalina.out).
2. Logstash: Logstash preprocesses collected logs, such as filtering, parsing, and conversion.
3. Data storage (Elasticsearch): Elasticsearch stores processed log data and creates indexes as needed.
4. Data visualization (Kibana): Kibana provides intuitive charts and dashboards to display log data in real time, making it convenient for abnormal monitoring.
5. Alarm mechanism (Zabbix): Integrate monitoring tools such as Zabbix, detect the number of error logs in Elasticsearch through custom scripts, set alarm thresholds, and issue alarms in a timely manner.

2. Custom script monitoring

Write shell scripts to check Tomcat log files regularly (such as catalina.out), look for specific error messages (such as memory overflow or connection pooling errors), and automatically restart the Tomcat service when an exception is found.

3. Log analysis tool assists monitoring

Some log analysis tools can simplify the monitoring process:

• WebLog Expert (Windows): A Windows platform tool designed specifically for analyzing Tomcat logs.
• Awstats: A powerful server log analysis tool that analyzes Tomcat access logs and error logs and generates detailed statistical reports.

4. Adjust log level

Modify Tomcat's logging.properties file, adjust the log level (INFO, WARNING, ERROR, etc.), and record more detailed error information to facilitate troubleshooting.

5. Real-time monitoring and alarm (Linux)

In Linux system, use the nohup command to start Tomcat, output the logs to the specified file, and combine the tail -f and grep commands to monitor the error information in a separate error log file.

6. Professional log management platform

Some professional log management platforms (such as EventLog Analyzer) provide more comprehensive log audit, analysis and management functions, supporting Tomcat log monitoring and alarms.

Choosing the right monitoring method depends on your actual needs and technical level. By combining the above methods, you can establish a complete Tomcat log exception monitoring system to ensure the stability and reliability of your application.

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