HikariCP 连接过多

我有一个Java Servlet，我想将连接池与jdbc一起使用（数据库：mysql）。

所以这就是我正在做的事情：

（此类是公共最终类 DBConnector）

private static final HikariDataSource dataSource = new HikariDataSource();
private static final HikariDataSource dataSource2 = new HikariDataSource();
private static final HikariDataSource dataSource3 = new HikariDataSource();

static {
    dataSource.setDriverClassName("com.mysql.jdbc.Driver");
    dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/contentdb");
    dataSource.setUsername("root2");
    dataSource.setPassword("password");
    dataSource.setMaximumPoolSize(400);
    dataSource.setMinimumIdle(5);
    dataSource.setLeakDetectionThreshold(15000);
    dataSource.setConnectionTestQuery("SELECT 1");
    dataSource.setConnectionTimeout(1000);

    dataSource2.setDriverClassName("com.mysql.jdbc.Driver");
    dataSource2.setJdbcUrl("jdbc:mysql://localhost:3306/userdb");
    dataSource2.setUsername("root");
    dataSource2.setPassword("password");
    dataSource2.setMaximumPoolSize(300);
    dataSource2.setMinimumIdle(5);
    dataSource2.setLeakDetectionThreshold(15000);
    dataSource2.setConnectionTestQuery("SELECT 1");
    dataSource2.setConnectionTimeout(1000);

    dataSource3.setDriverClassName("com.mysql.jdbc.Driver");
    dataSource3.setJdbcUrl("jdbc:mysql://localhost:3306/analysedb");
    dataSource3.setUsername("root2");
    dataSource3.setPassword("password");
    dataSource3.setMaximumPoolSize(200);
    dataSource3.setMinimumIdle(5);
    dataSource3.setLeakDetectionThreshold(15000);
    dataSource3.setConnectionTestQuery("SELECT 1");
    dataSource3.setConnectionTimeout(1000);

}

private DBConnector() {
    //
}

public static Connection getConnection(int dataBase) throws SQLException {
    if (dataBase == 0) {
        return dataSource.getConnection();
    } else if (dataBase == 1) {
        return dataSource2.getConnection();
    } else {
        return dataSource3.getConnection();
    }
}

当我想称呼它时：

Connection con = null;
    PreparedStatement query = null;
    ResultSet result = null;
    try {
        con = DBConnector.getConnection(0);
    }catch(SQLException ex){
    }finally{
       if (result != null) {
            try {
                result.close();
            } catch (SQLException logOrIgnore) {
            }
        }
        if (query != null) {
            try {
                query.close();
            } catch (SQLException logOrIgnore) {
            }
        }
        if (con != null) {
            try {
                con.close();
            } catch (SQLException logOrIgnore) {
            }
        }
    }

但是当我点击我的应用程序时，过了一会儿它开始挂起，我得到这些错误：

java.sql.SQLException: Timeout after 1001ms of waiting for a connection.
at com.zaxxer.hikari.pool.HikariPool.getConnection(HikariPool.java:208)
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:108)
at main.java.db.DBConnector.getConnection(DBConnector.java:60)
at main.java.ressources.SingleItemData.getVotes(SingleItemData.java:1088)
at main.java.item.methods.GET.content.GetStreamContent.getStreamContent(GetStreamContent.java:126)
at main.java.RestService.doGet(RestService.java:254)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)

由以下原因引起：com.mysql.jdbc.exceptions.jdbc4.CommunicationsException： Communications link failure

我将 mysql max_conncetions设置为 1000。“显示进程列表”查询向我显示了很多休眠进程。这些是闲置的吗？

我真的有点卡在这里。不知道哪个设置导致了这个问题。所以我的问题是 - 是什么原因导致这个错误？我做错了什么？任何帮助赞赏。

编辑：设置Mysql（本地主机）：

[mysqld]

user=mysql

port=3306

socket      =/Applications/XAMPP/xamppfiles/var/mysql/mysql.sock

key_buffer=16M

max_allowed_packet=1M

table_open_cache=64

sort_buffer_size=512K

net_buffer_length=8K

read_buffer_size=256K

read_rnd_buffer_size=512K

myisam_sort_buffer_size=8M

max_connections = 1000

wait_timeout = 28800

interactive_timeout = 28800

HikariCP：HikariCP-java6-2.2.5.jar

MySQL Connector：mysql-connector-java-5.1.25-bin.jar