Sample Log Files

Download sample log files to test all features of Log4j Analyzer. Includes multi-file correlation demos, format examples, and performance test files.

Download App First

Multi-File Correlation Demo

Three synchronized log files demonstrating timestamp-based correlation across different services

application-demo.log

9.1 KB•~150 entries

Main application service logs showing lifecycle, API requests, errors, and scheduled tasks

Features:

•Payment gateway errors
•Search highlighting demos
•Text format with dot milliseconds

Preview:

2025-09-30 10:00:00.123 [main] INFO  com.example.Application - Application starting up
2025-09-30 10:00:05.789 [http-thread-1] INFO  com.example.api.UserController - Processing GET /api/users
2025-09-30 10:00:22.456 [worker-3] ERROR com.example.payment.Gateway - Payment timeout after 30s

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api-service.log

5.7 KB•~80 entries

API Gateway logs showing request routing, upstream timeouts, and rate limiting

Features:

•Correlated timestamps
•Gateway-level errors
•Retry mechanisms

Preview:

2025-09-30 10:00:05.789 [gateway-1] INFO  com.api.Gateway - Routing request to /api/users
2025-09-30 10:00:22.450 [gateway-2] WARN  com.api.Gateway - Upstream timeout detected
2025-09-30 10:00:22.465 [gateway-2] INFO  com.api.Gateway - Retrying failed request

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database-service.log

7.4 KB•~95 entries

Database service logs showing queries, connection pooling, and backups

Features:

•Connection pool management
•Query execution logs
•Backup operations

Preview:

2025-09-30 10:00:01.234 [main] INFO  com.db.Pool - Initializing connection pool (size: 10)
2025-09-30 10:00:06.012 [worker-1] DEBUG com.db.Query - Executing: SELECT * FROM users
2025-09-30 10:00:22.300 [worker-2] ERROR com.db.Connection - Connection timeout after 5s

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Format Demonstration

Examples of different log formats supported by Log4j Analyzer

text-format.log

1.0 KB•~15 entries

Standard Log4j text format with comma milliseconds and thread names

Features:

•Text format parsing
•Thread names
•Exception stack traces

Preview:

2025-09-30 10:00:00,123 [main] INFO  com.example.App - Starting application
2025-09-30 10:00:01,456 [worker-1] DEBUG com.example.Service - Processing request
2025-09-30 10:00:02,789 [worker-1] ERROR com.example.Service - Failed to process

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xml-format.xml

2.0 KB•~12 entries

XML Log4j format with structured event data and full metadata

Features:

•XML parsing
•Structured events
•Complete metadata

Preview:

<log4j:event logger="com.example.App" timestamp="1696071600123" level="INFO">
  <log4j:message>Application started</log4j:message>
  <log4j:properties>
    <log4j:data name="thread" value="main"/>
  </log4j:properties>
</log4j:event>

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plain-text.log

424 B•~8 entries

Non-parseable plain text file demonstrating fallback mode

Features:

•Plain text fallback
•Graceful degradation
•Basic text display

Preview:

Application Server Log
====================
Server started at 10:00:00
User request received
Processing complete

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Performance & Features

Files for testing performance, live monitoring, and advanced features

large-dataset.log

612 KB•5000+ entries

Large file demonstrating pagination performance and responsive UI

Features:

•60fps performance
•Pagination testing
•Search with high volume

Preview:

2025-09-30 10:00:00.001 [worker-1] INFO  com.example.Service - Processing request #1
2025-09-30 10:00:00.023 [worker-2] INFO  com.example.Service - Processing request #2
... (5000+ entries demonstrating pagination performance)

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active-service.log

801 B•~12 entries

File for testing live tail and real-time monitoring features

Features:

•Live tail demo
•File change detection
•Real-time updates

Preview:

2025-09-30 10:00:00.123 [worker] INFO  com.example.ActiveService - Service started
2025-09-30 10:00:01.456 [worker] INFO  com.example.ActiveService - Request processed
(Append new entries to see live tail in action)

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Usage Tips

Get the most out of these sample files with these testing tips

Multi-File Analysis

Open all three correlation files (application-demo, api-service, database-service) together. Click on the payment error around 10:00:22 to see timestamp synchronization across services.

Search Demo

Use regex pattern "ERROR.*timeout|WARN.*degraded" to find all timeout and degraded service messages across files with highlighting.

Live Tail Testing

Open active-service.log and append new entries to see real-time monitoring in action. The app automatically detects file changes.

Performance Test

Open large-dataset.log and use search/filtering to see how pagination maintains 60fps performance with thousands of entries.

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