示例
protected void finalize() throws Throwable {
Connection conn = null;
try {
conn = getConnection();
conn.close();
}
catch (SQLException exc) {
LogUtility.log(exc);
}
finally {
if (conn != null) {
try {
conn.close();
}
catch (SQLException exc) {
LogUtility.log(exc);
}
}
super .finalize();
}
}

private Connection getConnection() {
return _connection;
}

private transient Connection _connection = null;
解决方案
使用显式调用的 cleanup 方法来代替 finalize() 方法。
public void free() {
Connection conn = null;
try {
conn = getConnection();
conn.close();
}
catch (SQLException exc) {
LogUtility.log(exc);
}
finally {
if (conn != null) {
try {
conn.close();
}
catch (SQLException exc) {
LogUtility.log(exc);
}
}
}
}

private Connection getConnection() {
return _connection;
}

private transient Connection _connection = null;