com.google.gwt.dev.shell.jetty.JDBCUnloader Maven / Gradle / Ivy
/*
* Copyright 2010 Google Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.google.gwt.dev.shell.jetty;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Enumeration;
/**
* Workaround hack for the unfortunate architecture of JDBC drivers.
*
* If code loaded by WebAppClassLoader loads a JDBC driver, then it will pin the
* class loader across server refresh because java.sql.DriverManager is a system
* class and it maintains a static reference to any loaded drivers.
*/
public class JDBCUnloader {
public static void unload() {
Enumeration drivers = DriverManager.getDrivers();
try {
while (drivers.hasMoreElements()) {
Driver driver = drivers.nextElement();
DriverManager.deregisterDriver(driver);
}
} catch (SQLException e) {
throw new RuntimeException("Error unloading the JDBC Drivers", e);
}
}
private JDBCUnloader() {
}
}