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hibernate2

LazyInitializationException: could not initialize proxy - no Session Error ๐Ÿ“Ž org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: ... entity.Folder.children could not initialize proxy - no Session ๊ฐœ์ธ์ ์œผ๋กœ ์ง„ํ–‰์ค‘์ธ ํ”„๋กœ์ ํŠธ์—์„œ JPA ์—ฐ๊ด€๊ด€๊ณ„ ํ…Œ์ด๋ธ”์˜ ์กฐํšŒ & ์‚ญ์ œ ํ•˜๋Š” ๊ณผ์ •์—์„œ ์œ„์™€ ๊ฐ™์€ ์—๋Ÿฌ๊ฐ€ ๋ฐœ์ƒํ–ˆ์Šต๋‹ˆ๋‹ค. ๊ด€๋ จ๋œ ์ฝ”๋“œ๋ฅผ ๊ฐ„๋‹จํžˆ ๋‚˜ํƒ€๋‚ด๋ฉด ๋‹ค์Œ๊ณผ ๊ฐ™์Šต๋‹ˆ๋‹ค. (ํฌ์ŠคํŒ…์—์„œ ํ‹€๋ฆฐ ๋‚ด์šฉ์ด ์žˆ๋‹ค๋ฉด ํ”ผ๋“œ๋ฐฑ ์ฃผ์‹œ๋ฉด ๊ฐ์‚ฌํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค. ๐Ÿ™Œ) Folder ์—”ํ‹ฐํ‹ฐ @Entity class Folder( ... @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name = "parent_id") @.. 2022. 6. 1.
Java ๊ด€๋ จ ๋ฉด์ ‘ ์ค€๋น„ 1 DataSource ์ˆœ์ˆ˜ jdbc๋กœ ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค์— ์ ‘๊ทผ์„ ํ•˜๋ฉด, ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค์— ์ ‘๊ทผํ•  ๋•Œ๋งˆ๋‹ค connection์„ ๋งบ๊ณ  ๋Š๋Š” ์ž‘์—…์„ ํ•œ๋‹ค. ์ด connection์„ ๋งบ๊ณ  ๋Š๋Š” ์ž‘์—…์„ ์ค„์ด๊ธฐ ์œ„ํ•ด ๋ฏธ๋ฆฌ connection์„ ์ƒ์„ฑํ•ด ๋‘๊ณ , ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค์— ์ ‘๊ทผํ•˜๊ณ ์ž ํ•˜๋Š” ์‚ฌ์šฉ์ž์—๊ฒŒ ๋ฏธ๋ฆฌ ์ƒ์„ฑ๋œ connection์„ ์ œ๊ณตํ•˜๊ณ  ๋Œ๋ ค๋ฐ›๋Š”๋‹ค. ์ด connection๋“ค์„ ๋ชจ์•„๋‘๋Š” ์žฅ์†Œ๋ฅผ connection pool์ด๋ผ ํ•˜๋ฉฐ, โ€‹Datasource๋Š” java ์—์„œ connection pool์„ ์ง€์›ํ•˜๊ธฐ ์œ„ํ•œ ์ธํ„ฐํŽ˜์ด์Šค์ด๋‹ค. โ€‹ โ€‹ โ€‹ JPA(Java Persistence API) ์ž๋ฐ” ํ”Œ๋žซํผ SE์™€ ์ž๋ฐ” ํ”Œ๋žซํผ EE๋ฅผ ์‚ฌ์šฉํ•˜๋Š” ์‘์šฉํ”„๋กœ๊ทธ๋žจ์—์„œ ๊ด€๊ณ„ํ˜• ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค์˜ ๊ด€๋ฆฌ๋ฅผ ํ‘œํ˜„ํ•˜๋Š” ์ž๋ฐ” API์ด๋‹ค. JPA๋ž€ DB ํ…Œ์ด๋ธ”๊ณผ.. 2020. 3. 26.
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