Mysql jdbc connection
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" max_allowed_packet" is a variable in MySQL config file that indicates the maximum packet size, not the maximum number of packets.
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MYSQL JDBC CONNECTION PASSWORD
Try to replace "localhost" with your port, like 127.0.0.1.Īlso try to add port number to your connection string, like: String connectionString = "jdbc:mysql://localhost:3306/my_database?user=root&password=Pass&useUnicode=true&characterEncoding=UTF-8" ĭon't forget to change username and password to the username and password of your MySQL server. All the connection string should be continues without any space characters. Make sure you don't have spaces in your string. String connectionString = "jdbc:mysql://localhost/" + dbName + "?user=" + dbUserName + "&password=" + dbPassword + "&useUnicode=true&characterEncoding=UTF-8" your connection string should be some thing like this: dbName = "my_database" Make sure the Fire wall, or Anti virus soft wares don't block MySQL service.Ĭheck your query string.
MYSQL JDBC CONNECTION CODE
Finally I changed my code and found out what was the problem. I have tested many approaches that have been mentioned in different web sites, but non of them worked.
MYSQL JDBC CONNECTION DRIVER
The driver has not received any packets from the server. The last packet sent successfully to the server was 0 milliseconds ago. My error was this: .jdbc4.CommunicationsException: Communications link failure 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.Īt 0(Native Method)Īt (NativeConstructorAccessorImpl.java:62)Īt (DelegatingConstructorAccessorImpl.java:45)Īt .newInstance(Constructor.java:423)Īt .(ExceptionFactory.java:54)Īt .(ExceptionFactory.java:73)Īt .(TimeUtil.java:118)Īt .(MysqlaSession.java:293)Īt .(ConnectionImpl.java:2399)Īt .(ConnectionImpl.java:1739)Īt .(ConnectionImpl.I have had the same problem in two of my programs. 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.Īt .(SQLError.java:545)Īt .(SQLError.java:513)Īt .(SQLError.java:505)Īt .(SQLError.java:479)Īt .(SQLError.java:489)Īt .(SQLExceptionsMapping.java:69)Īt .(ConnectionImpl.java:1606)Īt .jdbc.ConnectionImpl.(ConnectionImpl.java:633)Īt .(ConnectionImpl.java:347)Īt .(NonRegisteringDriver.java:219)Īt (DriverManager.java:664)Īt (DriverManager.java:247)Īt 0(Native Method)Īt (NativeMethodAccessorImpl.java:62)Īt (DelegatingMethodAccessorImpl.java:43)Īt .invoke(Method.java:498)Īt .(AppMain.java:147)Ĭaused by: .: The server time zone value 'MSK' is unrecognized or represents more than one time zone. : The server time zone value 'MSK' is unrecognized or represents more than one time zone. package com.company Ĭlass.forName(".jdbc.Driver") Ĭonnection con = DriverManager.getConnection("jdbc:mysql://:3306/straider_exam","045682268_exam", "4848")