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[Java] Unsupported major.minor version 52.0 Error ํ”„๋กœ์ ํŠธ ์„ธํŒ… ๋„์ค‘ java.lang.UnsupportedClassVersionError: org/springframework/util/StopWatch : Unsupported major.minor version 52.0 (unable to load class org.springframework.util.StopWatch) ๋ผ๋Š” ์—๋Ÿฌ๊ฐ€ ๋ฐœ์ƒํ•˜์˜€์Šต๋‹ˆ๋‹ค. version 52.0์€ jar ํŒŒ์ผ์˜ ๋นŒ๋“œ jdk ๋ฒ„์ „์„ ๋‚˜ํƒ€๋ƒ…๋‹ˆ๋‹ค. ์ˆซ์ž ๋ณ„ ์ž๋ฐ” ๋ฒ„์ „ Java SE 13 = 57 (0x39hex) Java SE 12 = 56 (0x38 hex) Java SE 11 = 55 (0x37 hex) Java SE 10 = 54 (0x36 hex) Java SE 9 = 53 (0x35 hex) Java SE 8 = 52 .. 2022. 6. 10.
[Java] javax.net.ssl.SSLHandshakeException: connection during handshake ์˜ค๋ฅ˜ ๋‚ด์šฉ javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake ์›์ธ ์„œ๋ฒ„์™€ ํด๋ผ์ด์–ธํŠธ์˜ SSL/TLS ๋ฒ„์ „์ด ๋งž์ง€ ์•Š์•„ ๋ฐœ์ƒ ๊ณผ๊ฑฐ Tomcat jdk 1.6๋ฒ„์ „ ์‚ฌ์šฉํ–ˆ์„๋•Œ ์„œ๋ฒ„ arguments์— '-Dhttps.protocols=TLSv1'๋ฅผ ์ถ”๊ฐ€ํ–ˆ์—ˆ์Šต๋‹ˆ๋‹ค. ๋ฐฉ์•ˆ System.setProperty("https.protocols", "TLSv1.2"); ์ฝ”๋“œ์— ์ถ”๊ฐ€ ํ˜„์žฌ๋Š” Tomcat jdk 1.8์„ ์‚ฌ์šฉํ•˜์—ฌ '-Dhttps.protocols=TLSv1'๋ฅผ ์‚ญ์ œํ•ด์ฃผ์—ˆ๋”๋‹ˆ ์ •์ƒ ๋™์ž‘ํ•˜์˜€์Šต๋‹ˆ๋‹ค. ์ฐธ๊ณ : https://sagittariusof85s.tistory.com/158 2022. 3. 23.
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