小编mce*_*ilg的帖子

使用JDBC连接到mysql数据库时出现此错误.

Database.getConnection() Error -->The server time zone value 'EEST' is
unrecognized or represents more than one time zone. You must configure
either the server or JDBC driver (via the serverTimezone configuration 
property) to use a more specifc time zone value if you want to utilize
time zone support.

那是我的连接代码.

public static Connection getConnection(){
    try {
        Class.forName("com.mysql.jdbc.Driver");

        Connection con = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/management", "root", "root");
        return con;
    } catch (ClassNotFoundException | SQLException e) {
        // TODO Auto-generated catch block
        System.out.println("Database.getConnection() Error -->" …

我有一个这样的加载缓存：

MyCacheLoader loader=new MyCacheLoader();
MyRemovalListener listener=new MyRemovalListener();
LoadingCache<String, String> myCache = CacheBuilder.newBuilder()
                .concurrencyLevel(10)
                .weakKeys()
                .maximumSize(2)
                .expireAfterWrite(120, TimeUnit.SECONDS)
                .removalListener(listener)
                .build(loader);

但是当我做这样的事情来测试时：

System.out.println(myCache.get("100"));
System.out.println(myCache.get("103"));
System.out.println(myCache.get("110"));
System.out.println(myCache).get("111"));
Thread.sleep(230000);
System.out.println(myCache.size());

我仍然得到 2 而不是零。为什么 ？超过 120 秒后，如果我没有错的话，我的大小应该为零吗？

我的缓存加载器

public class MyCacheLoader extends CacheLoader<String,String>     {
    @Override
    public String load(String key) throws Exception {
        return key;
    }
}

我的移除监听器

public class MyRemovalListener implements RemovalListener<String,String> {

    Logger logger = LoggerFactory.getLogger(MyRemovalListener.class);
    @Override
    public void onRemoval(RemovalNotification<String, String> removalNotification) {
        logger.info("Message with message Id ("+
                removalNotification.getKey()+ ") is removed.");
        System.out.println("Message with …