Exception while dropping database in JavaFX - mysql

private void delete() throws ClassNotFoundException, SQLException {
Class.forName("com.mysql.jdbc.Driver");
connect = DriverManager
.getConnection("jdbc:mysql://localhost:3306/delete?"
+ "user=root&password=virus");
statement = connect.createStatement();
preparedStatement = connect
.prepareStatement("DROP DATABASE delete");
preparedStatement.executeUpdate();
preparedStatement = connect
.prepareStatement("CREATE DATABASE delete");
preparedStatement.executeUpdate();
}
This is my code to delete a database in javafx. But when i ran this code it gives me an exception. Is details are -
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'delete' at line 1
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1053)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4120)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4052)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2503)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2664)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2794)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2458)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2375)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2359)
at deleteaccount.DeleteAccount.delete(DeleteAccount.java:106)
at deleteaccount.DeleteAccount.access$000(DeleteAccount.java:26)
at deleteaccount.DeleteAccount$1.handle(DeleteAccount.java:86)
at deleteaccount.DeleteAccount$1.handle(DeleteAccount.java:82)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:69)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:217)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:170)
Why this exception occur ? How can I solve it ?

Related

jdbc: Could not create connection to database server

I'm trying to connect with my Mysql database using java. I made a fresh Windows 7 install and also installed the newest versions of the JDK (12), Netbeans (11.1) and Mysql (8.0.17). The jdbc library has the version 8.0.17.
Code:
try {
Connection con = DriverManager.getConnection("jdbc:mysql://"
+ "127.0.0.1:3306/raspiOne?"
+ "useTimezone=true&serverTimezone=UTC"
+ "user=root&"
+ "password=labor01"
+ "&useSSL=false");
}
catch (SQLException ex) {
System.out.println("SQLException: " + ex.getMessage());
System.out.println("SQLState: " + ex.getSQLState());
System.out.println("VendorError: " + ex.getErrorCode());
Logger.getLogger(Databasetest.class.getName()).log(Level.SEVERE, null, ex);
}
The exception:
SQLException: Could not create connection to database server.
SQLState: 08001
VendorError: 0
Aug. 05, 2019 3:24:16 NACHM. raspberryone.TestingGrounds.Databasetest connect
SEVERE: null
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
at com.mysql.jdbc.Util.getInstance(Util.java:387)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:917)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:896)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:885)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2330)
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 java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:410)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:328)
at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:677)
at java.sql/java.sql.DriverManager.getConnection(DriverManager.java:251)
at raspberryone.TestingGrounds.Databasetest.connect(Databasetest.java:21)
at raspberryone.RaspberryOne.main(RaspberryOne.java:92)
Caused by: java.lang.NullPointerException
at com.mysql.jdbc.ConnectionImpl.getServerCharset(ConnectionImpl.java:2997)
at com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1936)
at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1865)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1228)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2253)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2284)
... 15 more
You forgot & after timezone
+ "&user=root&"

AWS RDS How to set up a MySQL Database

I have a Java application running on successfully on Amazon Web Services Elastic Beanstalk.
I am trying to set up MySQL. I have created a DB Instance as you can see:
Question 1:
How do I connect my Java App to the Database?
I have the following code (after viewing this):
#Bean
public DataSource dataSource() {
// Openshift
// String host = System.getenv("OPENSHIFT_MYSQL_DB_HOST");
// String port = System.getenv("OPENSHIFT_MYSQL_DB_PORT");
// String username = System.getenv("OPENSHIFT_MYSQL_DB_USERNAME");
// String password = System.getenv("OPENSHIFT_MYSQL_DB_PASSWORD");
// AWS
String host = System.getenv("RDS_HOSTNAME");
String port = System.getenv("RDS_PORT");
String username = System.getenv("RDS_USERNAME");
String password = System.getenv("RDS_PASSWORD");
String dbname = System.getenv("RDS_DB_NAME");
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName(environment.getRequiredProperty("jdbc.driverClassName"));
if (host == null) {
dataSource.setUrl(environment.getRequiredProperty("jdbc.url"));
dataSource.setUsername(environment.getRequiredProperty("jdbc.username"));
dataSource.setPassword(environment.getRequiredProperty("jdbc.password"));
} else {
//dataSource.setUrl("jdbc:mysql://" + host + ":" + port + "/");
// Openshift
//dataSource.setUrl("jdbc:mysql://" + host + ":" + port + "/" + environment.getRequiredProperty("jdbc.dbname"));
// AWS
dataSource.setUrl("jdbc:mysql://" + host + ":" + port + "/" + dbname);
dataSource.setUsername(username);
dataSource.setPassword(password);
System.out.println("jdbc:mysql://" + host + ":" + port + "/" + dbname+", username: "+username+", password: "+password);
}
return dataSource;
}
(p.s. the commented out code works on OpenShifts server)
But I get the following:
org.springframework.web.util.NestedServletException: Request
processing failed; nested exception is
org.springframework.transaction.CannotCreateTransactionException:
Could not open JPA EntityManager for transaction; nested exception is
org.hibernate.exception.JDBCConnectionException: Unable to acquire
JDBC Connection
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
Question 2:
From an existing database, in MySQL Workbench, I have exported sql scripts to create a schema and tables, and then populate them. How do I import this into the AWS RDS MySQL database?
More info:
Server Logs:
-------------------------------------
/var/log/tomcat8/localhost.2017-02-21.log
-------------------------------------
21-Feb-2017 14:42:51.133 INFO [localhost-startStop-1] org.apache.catalina.core.ApplicationContext.log 1 Spring WebApplicationInitializers detected on classpath
21-Feb-2017 14:42:51.737 INFO [localhost-startStop-1] org.apache.catalina.core.ApplicationContext.log Initializing Spring FrameworkServlet 'rest'
21-Feb-2017 14:57:36.680 SEVERE [http-nio-8080-exec-7] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [rest] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection] with root cause
java.net.ConnectException: Connection refused (Connection refused)
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 java.net.Socket.connect(Socket.java:538)
at java.net.Socket.<init>(Socket.java:434)
at java.net.Socket.<init>(Socket.java:244)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:258)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:306)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2504)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2541)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2323)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:832)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
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:408)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:417)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:344)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:208)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:153)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:144)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:155)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:120)
at org.hibernate.engine.jdbc.connections.internal.DatasourceConnectionProviderImpl.getConnection(DatasourceConnectionProviderImpl.java:122)
at org.hibernate.internal.NonContextualJdbcConnectionAccess.obtainConnection(NonContextualJdbcConnectionAccess.java:35)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.acquireConnectionIfNeeded(LogicalConnectionManagedImpl.java:99)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.getPhysicalConnection(LogicalConnectionManagedImpl.java:129)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.getConnectionForTransactionManagement(LogicalConnectionManagedImpl.java:247)
at org.hibernate.resource.jdbc.internal.LogicalConnectionManagedImpl.begin(LogicalConnectionManagedImpl.java:254)
at org.hibernate.resource.transaction.backend.jdbc.internal.JdbcResourceLocalTransactionCoordinatorImpl$TransactionDriverControlImpl.begin(JdbcResourceLocalTransactionCoordinatorImpl.java:203)
at org.hibernate.engine.transaction.internal.TransactionImpl.begin(TransactionImpl.java:56)
at org.springframework.orm.jpa.DefaultJpaDialect.beginTransaction(DefaultJpaDialect.java:67)
at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:380)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373)
at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:427)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:276)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
at com.sun.proxy.$Proxy55.findAll(Unknown Source)
at com.jobs.spring.controller.CategoryRESTService.findAllCategorys(CategoryRESTService.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:114)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:676)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:509)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1104)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1520)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1476)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
21-Feb-2017 15:09:21.090 INFO [localhost-startStop-2] org.apache.catalina.core.ApplicationContext.log Destroying Spring FrameworkServlet 'rest'
21-Feb-2017 15:09:38.729 INFO [localhost-startStop-1] org.apache.catalina.core.ApplicationContext.log 1 Spring WebApplicationInitializers detected on classpath
21-Feb-2017 15:09:39.329 INFO [localhost-startStop-1] org.apache.catalina.core.ApplicationContext.log Initializing Spring FrameworkServlet 'rest'
UPDATE
I also added rules to open it for everyone, but still get the same error:
The problem has to do with your database and the security group.
Hover to the "i" icon next to the Cluster Endpoint.
A popup will appear with the security groups.
Hit the first default link and you will be redirected to the security groups configuration.
Then you have to edit the security group and add an inbound rule in order to include your local ip.
Keep in mind that this will work only if your rds is on a public subnet.
This link is pretty helpful for troubleshooting.
More information on security groups

Error No. 2004. Cant create TCP/IP socket (10106)

I use XAMPP.
I can connect mysql via admin and phpmyadmin, but when i start to use java and connect to mysql the connection error.
I try to connect via SQLyog and i got these:
Host: localhost
username: root
password: "thepassword"
port: 3306
Error No. 25
Unknown mysql server host 'localhost'(2)
Then, I try to replace localhost with
Host: 127.0.0.1
username: root
password: "thepassword"
port: 3306
Error No. 2004
Cant create TCP/IP socket (10106)
Here's the class
public static Connection getKoneksi(String host, String port, String username, String password, String db ){
String konString = "jdbc:mysql://" + host + ":" + port + "/" + db;
Connection conn = null;
try{
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(konString, username, password);
System.out.println("Koneksi berhasil");
}catch(Exception ex){
ex.printStackTrace();
JOptionPane.showMessageDialog(null, ex.getMessage());
conn = null;
}
return conn;
}
How I use it
conn = (com.mysql.jdbc.Connection) dbConn.getKoneksi("127.0.0.1", "3306","gumelarme","passohpass","dbpr");
-print stack trace
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:408)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1117)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:355)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2461)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2498)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2283)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:822)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
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:408)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:404)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:317)
at java.sql.DriverManager.getConnection(DriverManager.java:664)
at java.sql.DriverManager.getConnection(DriverManager.java:247)
at Organizer.dbConn.getKoneksi(dbConn.java:22)
at Organizer.PR.<init>(PR.java:24)
at Organizer.PR$5.run(PR.java:254)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:744)
at java.awt.EventQueue.access$400(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:697)
at java.awt.EventQueue$3.run(EventQueue.java:691)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:714)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.net.SocketException: Unrecognized Windows Sockets error: 10106: create
at java.net.Socket.createImpl(Socket.java:460)
at java.net.Socket.<init>(Socket.java:431)
at java.net.Socket.<init>(Socket.java:244)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:305)
... 31 more

MariaDB CommunicationsException: Communications link failure

There seems to be enough of questions relating to CommunicationsException were posted on Stackoverflow. But none of them helps me out of a difficult position.
I installed MariaDB 5.5 in my CentOS 7 server, and configured everything so that I can connect to the DB server remotely through a MySQL Workbench or Data Source Explorer in eclipse. A screen capture of the succeed connections is like below.
However, when I try to connect the DB Server via JDBC, it continues to fail with the Exception "com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure".
The test class is shown as following.
package com.pratice;
import java.sql.*;
public class DatabaseConn {
public static void main(String[] args) throws Exception{
Connection conn = null;
ResultSet rs = null;
Statement stmt = null;
String url = "jdbc:mysql://59.12.140.121:6330/myPrjs";//?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true
String username = "user";
String password = "password";
String driver = "com.mysql.jdbc.Driver";
try{
Class.forName(driver);
conn = DriverManager.getConnection(url, username, password);
stmt = conn.createStatement();
rs = stmt.executeQuery("SELECT 1");
while(rs.next()){
System.out.print(rs.getObject(1) + "\t" + rs.getObject(2));
}
}finally{
if(rs!=null) {
rs.close();
}
if(stmt!=null) {
stmt.close();
}
if (conn != null) {
conn.close();
}
}
}
}
When I run DatabaseConn, I got the error messages.
Exception in thread "main" 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:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1127)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:356)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2502)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2539)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2321)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:832)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:417)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:344)
at java.sql.DriverManager.getConnection(DriverManager.java:571)
at java.sql.DriverManager.getConnection(DriverManager.java:215)
at com.webjsp.pratice.DatabaseConn.main(DatabaseConn.java:18)
Caused by: java.net.SocketException: Bad address: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at java.net.Socket.connect(Socket.java:528)
at java.net.Socket.<init>(Socket.java:425)
at java.net.Socket.<init>(Socket.java:241)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:258)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:306)
... 15 more
I cannot solve this problem so I searched on the internet, and I found a checklist at here . But now that I can connect to my DB server via IDEs, I don't know what could be wrong.
I also tried to use org.mariadb.jdbc.driver instead of mysql driver, I got error messages too.
Exception in thread "main" java.sql.SQLNonTransientConnectionException: Could not connect to 59.12.140.121:6330 : Bad address: connect
at org.mariadb.jdbc.internal.SQLExceptionMapper.get(SQLExceptionMapper.java:136)
at org.mariadb.jdbc.internal.SQLExceptionMapper.throwException(SQLExceptionMapper.java:106)
at org.mariadb.jdbc.Driver.connect(Driver.java:115)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at DatabaseConn.main(DatabaseConn.java:16)
Caused by: org.mariadb.jdbc.internal.common.QueryException: Could not connect to 59.12.140.121:6330
: Bad address: connect
at org.mariadb.jdbc.internal.mysql.MySQLProtocol.connect(MySQLProtocol.java:714)
at org.mariadb.jdbc.internal.mysql.MySQLProtocol.<init>(MySQLProtocol.java:280)
at org.mariadb.jdbc.Driver.connect(Driver.java:111)
... 3 more
Caused by: java.net.SocketException: Bad address: connect
at java.net.DualStackPlainSocketImpl.connect0(Native Method)
at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at org.mariadb.jdbc.internal.mysql.MySQLProtocol.connect(MySQLProtocol.java:387)
at org.mariadb.jdbc.internal.mysql.MySQLProtocol.connect(MySQLProtocol.java:709)
... 5 more
Could anyone tell me how can I solve this problem, or give me some hints that why does it happening? Thank you so much.
The key point to figure the problem out is at "java.net.SocketException: Bad address: connect".
The problem was caused by firewall rules at the client side (My Windows PC). I enabled Ahnlab V3 Internet Security Personal Firewall on my client PC. The outbound rules only allow certain types of outgoing socket by default. When I tried to connect to my remote server with a workbench, there was no problem. But when I tried to connect to the server by running the java Class, the local firewall kept the socket, so the connection requests did not even go through my network card! I add a new outbound rule which allows mysql outbound connection, and then my program runs normally.
Hope this will help anyone who encounters the same problem.

mysql update error for below queries

I am using follwing query to update.
my update function and connection string is in jar file.
I am using JSP useBean to call function from jar file.
I am able to run select queries on databse.
only getting problem in updating .
why I am getting this error now earlier it was working fine.
queries
String sql="INSERT INTO tm_visitor(VDT,VID,VISITOR_TEXT,COMPANY_TEXT,CONTACT,PERSON_TO_MEET,DEPARTMENT_TEXT,FLOOR)SELECT REPLACE(LEFT(NOW(), 10), '-', ''), LPAD(COALESCE(MAX(VID) + 1, 000001),6,'0'),?,?,?,?,?,? FROM tm_visitor";
query2
String sql2="INSERT INTO tm_belonging(BID,BELONGING_TYPE,BELONGING_TEXT)VALUES(LAST_INSERT_ID(),?,?)";
error:
Error in DBConnect com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Y
ou have an error in your SQL syntax; check the manual that corresponds to your M
ySQL server version for the right syntax to use near '?,?,?,?,?,? FROM tm_visito
r' at line 1
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in
your SQL syntax; check the manual that corresponds to your MySQL server version
for the right syntax to use near '?,?,?,?,?,? FROM tm_visitor' at line 1
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou
rce)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at com.mysql.jdbc.Util.getInstance(Util.java:381)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1030)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3536)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3468)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1957)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2107)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2642)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1634)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1553)
at com.vms.util.MyDBConnect.exeUpdate(Unknown Source)
at org.apache.jsp.applicationservices.fileshare.vm.apps.admin.visitorSub
mit_jsp._jspService(visitorSubmit_jsp.java:148)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:377)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
13)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:857)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ss(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:48
9)
at java.lang.Thread.run(Unknown Source)
Error in DBConnect com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Y
ou have an error in your SQL syntax; check the manual that corresponds to your M
ySQL server version for the right syntax to use near '?,?)' at line 1
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in
your SQL syntax; check the manual that corresponds to your MySQL server version
for the right syntax to use near '?,?)' at line 1
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou
rce)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at com.mysql.jdbc.Util.getInstance(Util.java:381)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1030)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3536)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3468)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1957)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2107)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2642)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1634)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1553)
at com.vms.util.MyDBConnect.exeUpdate(Unknown Source)
at org.apache.jsp.applicationservices.fileshare.vm.apps.admin.visitorSub
mit_jsp._jspService(visitorSubmit_jsp.java:151)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:377)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:3
13)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:857)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ss(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:48
9)
at java.lang.Thread.run(Unknown Source)
EDIT
JSP CODE:
<jsp:useBean id="mdc" class="com.vms.util.MyDBConnect"/>
boolean status=false;
String VisitorName="",Company="",Contact="",WhomeToMeet="",Department="",DepartmentFloor="";
String Belonging="",BType="",Belonging2="",BType2="",Belonging3="",BType3="";
String Btype="",Belong="";
try
{
VisitorName=(String)request.getParameter("VisitorName");
out.println(","+VisitorName);
Company=(String)request.getParameter("Company");
out.println(","+Company);
Contact=(String)request.getParameter("Contact");
out.println(","+Contact);
WhomeToMeet=(String)request.getParameter("WhomeToMeet");
out.println(","+WhomeToMeet);
Department=(String)request.getParameter("Department");
out.println(","+Department);
DepartmentFloor=(String)request.getParameter("DepartmentFloor");
out.println(","+DepartmentFloor);
BType=(String)request.getParameter("BType0");
out.println(","+BType);
Belonging=(String)request.getParameter("Belonging0");
out.println(","+Belonging);
String sql="INSERT INTO tm_visitor(VDT,VID,VISITOR_TEXT,COMPANY_TEXT,CONTACT,PERSON_TO_MEET,DEPARTMENT_TEXT,FLOOR)SELECT REPLACE(LEFT(NOW(), 10), '-', ''), LPAD(COALESCE(MAX(VID) + 1, 000001),6,'0'),?,?,?,?,?,? FROM tm_visitor";
//System.out.println(sql);
String sql2="INSERT INTO tm_belonging(BID,BELONGING_TYPE,BELONGING_TEXT)VALUES(LAST_INSERT_ID(),?,?)";
//System.out.println(sql2);
mdc.exeUpdate(sql);
mdc.exeUpdate(sql2);
}
catch(Exception e)
{
e.printStackTrace();
//System.out.println("eRROR>>\n"+e);
}
Whenever yo use an ? in your statement, means that it will be "replaced" by a parameter.
You have to bind those paramters when executing the query.
Using standard JDBC syntax, it will be something like :
PreparedStatement prepStmt = connection.prepareStatement(sql);
prepStmt.setString(1, paramValue1);
prepStmt.setInt(2, paramValue2);
....
prepStmt.setInt(n, paramValueN);
prepStmt.execute();
Hope it helps