Spring Boot Cannot Reach PostgreSQL in Docker When Using Localhost Connection String
Developers configuring Spring Boot to connect to PostgreSQL running in Docker frequently hit authentication failures because localhost inside a container refers to the container itself, not the host machine. This common Docker networking misunderstanding blocks local development setup. The fix is well-documented but Spring Boot error messages do not surface the root cause clearly.
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Problem descriptions, scores, analysis, and solution blueprints may be updated as new community data becomes available.