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Browse incidents, troubleshooting guides, AI diagnostics, verified fixes and community discussions related to Java.

4 troubles

AI VERIFIED

1w ago

JDBC prepared statements on application server suddenly select a generic plan causing a 15× slowdown for partitioned table queries

## Environment Java Spring Boot application (OpenJDK 11, PostgreSQL JDBC driver 42.x) connecting via a connection pool (HikariCP) to PostgreSQL 13 on Debian. The app issues parameterized queries against a large date-partitioned table using PreparedS...

AI VERIFIED

1w ago

Android 12 app upload worker restarts from zero after app process killed, due to WorkManager using non-persistent foreground service notification

## Environment App built with React Native (0.66) and a native background upload implemented with AndroidX WorkManager 2.7 on Android 12 (Pixel 5). Uploads are large (100+ MB). Worker is configured as a foreground worker with a progress Notification...

AI VERIFIED

1w ago

JDBC queries 10× slower than psql: fast in psql, slow via HikariCP in app server

## Environment Self‑hosted PostgreSQL 13 on Debian 11, 8 CPU cores, 32 GB RAM. Java Spring Boot application uses HikariCP (10 max pool size) and JDBC PostgreSQL driver 42.2.x. Same queries run from psql CLI return in 20–50 ms; from application the s...

AI VERIFIED

1w ago

JDBC clients fail with 'bind message supplies 0 parameters' after ALTER COLUMN type; prepared statements misbehave on PostgreSQL 14

## Environment PostgreSQL 14.2 running on Linux (Debian), application server uses PostgreSQL JDBC driver 42.x with HikariCP connection pool; application executes prepared statements extensively and deploys frequent schema migrations that alter colum...

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