Setet one

book-rent/src/main/java/com/example/demo/BookRentApplication.java

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+package com.example.demo;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class BookRentApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(BookRentApplication.class, args);
+	}
+
+}

book-rent/src/main/java/com/example/demo/ServletInitializer.java

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+package com.example.demo;
+
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
+
+public class ServletInitializer extends SpringBootServletInitializer {
+
+	@Override
+	protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
+		return application.sources(BookRentApplication.class);
+	}
+
+}

book-rent/src/main/resources/application.properties

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+spring.application.name=book-rent
+
+# --- MySQL (CREATE DATABASE.sql \u3067\u4f5c\u6210\u3057\u305f book_manage) ---
+spring.datasource.url=jdbc:mysql://localhost:3306/book_manage?serverTimezone=Asia/Tokyo&characterEncoding=UTF-8
+spring.datasource.username=bookuser
+spring.datasource.password=Book2026
+
+# \u30c6\u30fc\u30d6\u30eb\u306fSQL\u3067\u4f5c\u6210\u6e08\u307f\u3002JPA\u3067\u306f\u5909\u66f4\u3057\u306a\u3044
+spring.jpa.hibernate.ddl-auto=none
+spring.jpa.open-in-view=false
+spring.jpa.properties.hibernate.jdbc.time_zone=Asia/Tokyo
+
+spring.thymeleaf.cache=false
+server.servlet.session.timeout=30m

book-rent/src/test/java/com/example/demo/BookRentApplicationTests.java

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+package com.example.demo;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class BookRentApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}