Spring Boot App Fails on Azure App Service – Root Cause and Fix
A Spring Boot application working perfectly on local or VM environments but failing after deployment to Azure App Service is a very common production issue. In many cases: The app starts locally without errors The build succeeds Deployment completes successfully ❌ But the application fails to start or crashes on Azure App Service This blog explains: Why Spring Boot apps fail on Azure App Service The most common root causes Proven fixes used in real production projects đź”´ Common Symptoms You may observe one or more of the following: App Service shows “Application Error” Continuous restarts HTTP 502 / 503 errors App works locally but not on Azure Logs show startup failure or no logs at all 🧠Root Causes (Most Important Section) 1️⃣ Incorrect Java Version on Azure App Service Azure App Service does not always use the same Java version as your local machine. Example: Local: Java 17 Azure App Service: Java 8 or 11 ➡️ This...