Projects

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PTS UI && SERVICE

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DCTR SERVICE CI

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HMBS BRE SERVICE

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RECERTIFICATION SERVICE

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HUD11708 SERVICE

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BATCH JOB

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Challenges

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Virtual thread block the other thread

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1. jps -l # to list java process, find springboot Application.class process 2.0 jcmd 12345 help
2. jcmd 12345 Thread.print

3. jcmd 12345 VM.flags # inspect JVM flags
4. jcmd 12345 GC.heap_info

5. jcmd PID VM.command_line # inspect JVM arguments

Use JFR

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1. jcmd 12345 JFR.start name=debug duration=60s filename=C:\temp\debug.jfr 1.1 jcmd JFR.check 1.2 jcmd JFR.stop name=xxx
2. jmc

BRE performance: stream dao layer for large query, separate query to avoid large CTE, virtual thread

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Production defect: WAF rule

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DB Unique index constraint bug for efficient code

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Drool syntax: && cannot skip second part, comma can skip second part

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Not code related: not coding error, need to push back to not coding error

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jdk25 bugs:

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2. jackson 3, cannot use primitive boolean in payload

sb4 bugs:

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1. queryForObject always throw EmptyResultDataAccessException if set fetchSize globally, we should use for each preparedStatement for each query

improve query performance

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1. reduce the size of CTE (common table expression)
2. landing on index (most of time)
3. improve table join