- #MAMP FOR WINDOWS SPRINGBOOT DRIVER#
- #MAMP FOR WINDOWS SPRINGBOOT SOFTWARE#
- #MAMP FOR WINDOWS SPRINGBOOT CODE#
- #MAMP FOR WINDOWS SPRINGBOOT PASSWORD#
#MAMP FOR WINDOWS SPRINGBOOT PASSWORD#
Try to replace "localhost" with the loopback address 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" # Redhat enterprise and CentOSĬheck your query string. If iptables are misconfigured they may allow tcp packets to be sent to mysql port, but block tcp packets from coming back on the same connection.
#MAMP FOR WINDOWS SPRINGBOOT SOFTWARE#
Make sure the Firewall, or Anti-virus software isn't blocking MySQL service. On Linux, this could also be achieved by running (or placing it inside /etc/profile: export _JAVA_OPTIONS="4Stack=true"Ĭheck Operating System proxy settings, firewalls and anti-virus programs Run java with the option 4Stack=true to force java to use IPv4 instead of IPv6. In the connection string use 127.0.0.1 instead of localhost to avoid localhost being translated to :::1 This could be avoided by using one of two approaches: Since MySQL recognizes 127.0.0.1 ( IPv4) but not :::1 ( IPv6) Make sure Java isn't translating 'localhost' to instead of If there is a skip-networking line in your MySQL config file, make it comment by adding # sign at the beginning of that line.Ĭhange "wait_timeout" and "interactive_timeout"Īdd these lines to the MySQL config file: = *number* Uncomment bind-address attribute or change it to one of the following IPs: bind-address="127.0.0.1" Windows: C:\**ProgramData**\MySQL\MySQL Server 5.6\my.ini (Notice it's ProgramData, not Program Files) Linux: /etc/mysql/my.cnf or /etc/my.cnf (depending on the Linux distribution and MySQL package used) Tip: For the solutions that you need to change the MySQL settings, you can refer to the following files: Here are the solutions that I found on the internet and for each of them, there is at least on person who his problem has been solved with that solution. So I suggest you to try all the solutions one by one and don't give up!
Maybe the problem is because of the wrong query string or too many connections to the database. It seems this error can occur generally when there is a problem in connecting to the server. While I was seeking the internet to find the solution for this error, I figured out that there are many solutions that worked for at least one person, but others say that it doesn't work for them! why there are many approaches to this error?
I'll try to tell you about different approaches and sum them up here.
#MAMP FOR WINDOWS SPRINGBOOT 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. I spent several days to solve this problem.
My error was this: .jdbc4.CommunicationsException: Communications link failure I have had the same problem in two of my programs. I made sure that the user had access to my database. I've set the classpath, made sure my.cnf had the skip network option commented out.
#MAMP FOR WINDOWS SPRINGBOOT DRIVER#
The driver has not received any packets from the server.Ĭom.4.CommunicationsException: Communications link failureĪt 0(Native Method)Īt (NativeConstructorAccessorImpl.java:39)Īt (DelegatingConstructorAccessorImpl.java:27)Īt .newInstance(Constructor.java:513)Īt .handleNewInstance(Util.java:411)Īt .createCommunicationsException(SQLError.java:1116)Īt .(MysqlIO.java:344)Īt .coreConnect(ConnectionImpl.java:2333)Īt .connectOneTryOnly(ConnectionImpl.java:2370)Īt .createNewIO(ConnectionImpl.java:2154)Īt .(ConnectionImpl.java:792)Īt 4Connection.(JDBC4Connection.java:47)Īt .getInstance(ConnectionImpl.java:381)Īt .connect(NonRegisteringDriver.java:305)Īt (DriverManager.java:582)Īt (DriverManager.java:185)Ĭaused by: : Connection refusedĪt (Native Method)Īt (PlainSocketImpl.java:351)Īt (PlainSocketImpl.java:213)Īt (PlainSocketImpl.java:200)Īt (SocksSocketImpl.java:366)Īt (Socket.java:529)Īt (Socket.java:478)Īt .connect(StandardSocketFactory.java:257)Īt .(MysqlIO.java:294) The last packet sent successfully to the server was 0 milliseconds ago. ("Database Connection Terminated") Īnd the errors : Cannot connect to database server String url = "jdbc:mysql://localhost:3306/myDatabaseName" Ĭlass.forName("").newInstance() Ĭonn = DriverManager.getConnection(url, userName, password) I'm trying to connect to the local MySQL server but I keep getting an error.
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