throw org.sql2o.Sql2oException: Could not acquire a connection from DataSource - Communications link failure exception

[Zhiyuan Ma]

in my codes,

try (Connection con = sql2o.beginTransaction()) {
    con.createQuery(del).executeUpdate();
    log.debug("delete record aid:" + tid);

    Query insertq = con.createQuery(insert);

    for (Item item : li) {
        insertq.addParameter("aid", tid)
                .addParameter("type", type)
                .addParameter("kw", item.kw)
                .addParameter("rate", item.rate)
                .addParameter("cid", item.cid)
                .addParameter("year", item.year)
                .addParameter("sort", item.sort)
                .addParameter("date", LocalDate.now())
                .addToBatch();
    }
    insertq.executeBatch();
    con.commit();
    log.debug("insert record aid = " + tid + " ,size = " + li.size());
}

sometimes, it throws an exception:

Exception in thread "main" org.sql2o.Sql2oException: Could not acquire a connection from DataSource - Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
    at org.sql2o.Connection.createConnection(Connection.java:291)
    at org.sql2o.Connection.<init>(Connection.java:51)
    at org.sql2o.Sql2o.beginTransaction(Sql2o.java:301)
    at org.sql2o.Sql2o.beginTransaction(Sql2o.java:320)
    at com.bftv.recsys.recItems.KeywordsDbWriter.toDB(KeywordsDbWriter.java:84)
    at com.bftv.recsys.recItems.KeywordsDbWriter.file2DB(KeywordsDbWriter.java:62)
    at com.bftv.recsys.recItems.KeywordsDbWriter.main(KeywordsDbWriter.java:36)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:989)
    at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:341)
    at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2251)
    at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2284)
    at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2083)
    at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:806)
    at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
    at sun.reflect.GeneratedConstructorAccessor6.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
    at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:410)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:328)
    at java.sql.DriverManager.getConnection(DriverManager.java:664)
    at java.sql.DriverManager.getConnection(DriverManager.java:208)
    at org.sql2o.GenericDatasource.getConnection(GenericDatasource.java:62)
    at org.sql2o.Connection.createConnection(Connection.java:288)
    ... 6 more
Caused by: java.net.NoRouteToHostException: 无法指定被请求的地址 (Address not available)
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:211)
    at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300)


some one know why?

[Lars Aaberg]

This looks like a problem with the connection to your mysql server...

Found this stack overflow topic.

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