What methods and tools do you use to analyze log files for problems and errors?

The following methods and tools are commonly used for analyzing log files in Java projects:

• Viewing logs through text editors or command-line utilities — for example, tail, grep, less for quick searching and viewing.
• Using specialized log analysis tools: such as ELK Stack (Elasticsearch, Logstash, Kibana) for centralized collection, indexing, and visualization of logs.
• Logging with libraries: Log4j, SLF4J, Logback — allow structuring logs, adding logging levels (ERROR, WARN, INFO, DEBUG), which facilitates filtering.
• Searching by keywords and error patterns — using regular expressions or built-in filters.

Example of using grep to find errors in logs:

grep "ERROR" application.log

It is also important to analyze the error context, timestamps, and event sequences to identify the root cause.