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part07의 게시판 프로젝트들에도 적용 (#41)
web.xml 기반의 ex06-board에도 적용해서 동작을 확인했다.
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4 files changed

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‎part07/ex06-board/src/main/java/org/fp024/servlet/listener/JDBCDriverCleaner.java‎

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package org.fp024.servlet.listener;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletContextEvent;
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import javax.servlet.ServletContextListener;
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import java.sql.DriverManager;
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import java.sql.SQLException;
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import java.util.Collections;
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import lombok.extern.slf4j.Slf4j;
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@Slf4j
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public class JDBCDriverCleaner implements ServletContextListener {
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protected void deregisterJdbcDrivers(ServletContext servletContext) {
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Collections.list(DriverManager.getDrivers())
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.forEach(
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driver -> {
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ClassLoader driverClassLoader = driver.getClass().getClassLoader();
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ClassLoader contextClassLoader = servletContext.getClassLoader();
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ClassLoader parentClassLoader =
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contextClassLoader != null ? contextClassLoader.getParent() : null;
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LOGGER.debug(
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"### {} 드라이버의 클래스 로더: {}",
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driver.getClass().getCanonicalName(),
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driverClassLoader != null
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? driverClassLoader.getClass().getCanonicalName()
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: "Bootstrap ClassLoader");
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LOGGER.debug(
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"### 현재 서블릿 컨텍스트의 클래스 로더: {}",
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contextClassLoader != null
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? contextClassLoader.getClass().getCanonicalName()
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: "Bootstrap ClassLoader");
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LOGGER.debug(
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"### 현재 서블릿 컨텍스트의 부모 클래스 로더: {}",
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parentClassLoader != null
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? parentClassLoader.getClass().getCanonicalName()
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: "Bootstrap ClassLoader");
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if (driverClassLoader == contextClassLoader
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|| driverClassLoader == parentClassLoader) {
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try {
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DriverManager.deregisterDriver(driver);
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LOGGER.info("### {} 드라이버 등록 해제", driver.getClass().getCanonicalName());
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} catch (SQLException ex) {
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LOGGER.warn("### {} 드라이버 등록 해제 실패", driver.getClass().getCanonicalName(), ex);
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}
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}
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});
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}
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@Override
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public void contextDestroyed(ServletContextEvent event) {
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LOGGER.trace("contextDestroyed() 실행...");
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deregisterJdbcDrivers(event.getServletContext());
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}
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}

‎part07/ex06-board/src/main/webapp/WEB-INF/web-linux.xml‎

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xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
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version="4.0">
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<!-- JDBC 드라이버 해제 리스너, 맨 마지막에 실행되도록 최상단에 둔다.-->
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<listener>
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<listener-class>org.fp024.servlet.listener.JDBCDriverCleaner</listener-class>
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</listener>
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<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
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<context-param>
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<param-name>contextConfigLocation</param-name>

‎part07/ex06-board/src/main/webapp/WEB-INF/web.xml‎

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xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
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version="4.0">
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<!-- JDBC 드라이버 해제 리스너, 맨 마지막에 실행되도록 최상단에 둔다.-->
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<listener>
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<listener-class>org.fp024.servlet.listener.JDBCDriverCleaner</listener-class>
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</listener>
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<!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
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<context-param>
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<param-name>contextConfigLocation</param-name>

‎part07/jex06-board/src/main/java/org/fp024/servlet/listener/JDBCDriverCleaner.java‎

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package org.fp024.servlet.listener;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletContextEvent;
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import javax.servlet.ServletContextListener;
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import javax.servlet.annotation.WebListener;
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import java.sql.DriverManager;
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import java.sql.SQLException;
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import java.util.Collections;
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import lombok.extern.slf4j.Slf4j;
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@Slf4j
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@WebListener
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public class JDBCDriverCleaner implements ServletContextListener {
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protected void deregisterJdbcDrivers(ServletContext servletContext) {
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Collections.list(DriverManager.getDrivers())
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.forEach(
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driver -> {
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ClassLoader driverClassLoader = driver.getClass().getClassLoader();
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ClassLoader contextClassLoader = servletContext.getClassLoader();
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ClassLoader parentClassLoader =
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contextClassLoader != null ? contextClassLoader.getParent() : null;
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LOGGER.debug(
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"### {} 드라이버의 클래스 로더: {}",
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driver.getClass().getCanonicalName(),
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driverClassLoader != null
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? driverClassLoader.getClass().getCanonicalName()
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: "Bootstrap ClassLoader");
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LOGGER.debug(
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"### 현재 서블릿 컨텍스트의 클래스 로더: {}",
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contextClassLoader != null
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? contextClassLoader.getClass().getCanonicalName()
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: "Bootstrap ClassLoader");
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LOGGER.debug(
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"### 현재 서블릿 컨텍스트의 부모 클래스 로더: {}",
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parentClassLoader != null
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? parentClassLoader.getClass().getCanonicalName()
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: "Bootstrap ClassLoader");
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if (driverClassLoader == contextClassLoader
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|| driverClassLoader == parentClassLoader) {
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try {
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DriverManager.deregisterDriver(driver);
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LOGGER.info("### {} 드라이버 등록 해제", driver.getClass().getCanonicalName());
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} catch (SQLException ex) {
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LOGGER.warn("### {} 드라이버 등록 해제 실패", driver.getClass().getCanonicalName(), ex);
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}
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}
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});
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}
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@Override
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public void contextDestroyed(ServletContextEvent event) {
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LOGGER.trace("contextDestroyed() 실행...");
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deregisterJdbcDrivers(event.getServletContext());
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}
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}

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