Błąd podczas połączenia się z bazą MySQL

0

Mam taki problem :

<ConnectionProperties>
 <PropertyCategory name="Connection/Authentication">
  <Property name="user" required="No" default="" sortOrder="-2147483647" since="all versions">
    The user to connect as
  </Property>
  <Property name="password" required="No" default="" sortOrder="-2147483646" since="all versions">
    The password to use when connecting
  </Property>
  <Property name="socketFactory" required="No" default="com.mysql.jdbc.StandardSocketFactory" sortOrder="4" since="3.0.3">
    The name of the class that the driver should use for creating socket connections to the server. This class must implement the interface 'com.mysql.jdbc.SocketFactory' and have public no-args constructor.
  </Property>
  <Property name="connectTimeout" required="No" default="0" sortOrder="9" since="3.0.1">
    Timeout for socket connect (in milliseconds), with 0 being no timeout. Only works on JDK-1.4 or newer. Defaults to '0'.
  </Property>
  <Property name="socketTimeout" required="No" default="0" sortOrder="10" since="3.0.1">
    Timeout on network socket operations (0, the default means no timeout).
  </Property>
  <Property name="connectionLifecycleInterceptors" required="No" default="" sortOrder="2147483647" since="5.1.4">
    A comma-delimited list of classes that implement "com.mysql.jdbc.ConnectionLifecycleInterceptor" that should notified of connection lifecycle events (creation, destruction, commit, rollback, setCatalog and setAutoCommit) and potentially alter the execution of these commands. ConnectionLifecycleInterceptors are "stackable", more than one interceptor may be specified via the configuration property as a comma-delimited list, with the interceptors executed in order from left to right.
  </Property>
  <Property name="useConfigs" required="No" default="" sortOrder="2147483647" since="3.1.5">
    Load the comma-delimited list of configuration properties before parsing the URL or applying user-specified properties. These configurations are explained in the 'Configurations' of the documentation.
  </Property>
  <Property name="authenticationPlugins" required="No" default="" sortOrder="alpha" since="5.1.19">
    Comma-delimited list of classes that implement com.mysql.jdbc.AuthenticationPlugin and which will be used for authentication unless disabled by "disabledAuthenticationPlugins" property.
  </Property>
  <Property name="defaultAuthenticationPlugin" required="No" default="com.mysql.jdbc.authentication.MysqlNativePasswordPlugin" sortOrder="alpha" since="5.1.19">
    Name of a class implementing com.mysql.jdbc.AuthenticationPlugin which will be used as the default authentication plugin (see below). It is an error to use a class which is not listed in "authenticationPlugins" nor it is one of the built-in plugins. It is an error to set as default a plugin which was disabled with "disabledAuthenticationPlugins" property. It is an error to set this value to null or the empty string (i.e. there must be at least a valid default authentication plugin specified for the connection, meeting all constraints listed above).
  </Property>
  <Property name="disabledAuthenticationPlugins" required="No" default="" sortOrder="alpha" since="5.1.19">
    Comma-delimited list of classes implementing com.mysql.jdbc.AuthenticationPlugin or mechanisms, i.e. "mysql_native_password". The authentication plugins or mechanisms listed will not be used for authentication which will fail if it requires one of them. It is an error to disable the default authentication plugin (either the one named by "defaultAuthenticationPlugin" property or the hard-coded one if "defaultAuthenticationPlugin" property is not set).
  </Property>
  <Property name="disconnectOnExpiredPasswords" required="No" default="true" sortOrder="alpha" since="5.1.23">
    If "disconnectOnExpiredPasswords" is set to "false" and password is expired then server enters "sandbox" mode and sends ERR(08001, ER_MUST_CHANGE_PASSWORD) for all commands that are not needed to set a new password until a new password is set.
  </Property>
  <Property name="interactiveClient" required="No" default="false" sortOrder="alpha" since="3.1.0">
    Set the CLIENT_INTERACTIVE flag, which tells MySQL to timeout connections based on INTERACTIVE_TIMEOUT instead of WAIT_TIMEOUT
  </Property>
  <Property name="localSocketAddress" required="No" default="" sortOrder="alpha" since="5.0.5">
    Hostname or IP address given to explicitly configure the interface that the driver will bind the client side of the TCP/IP connection to when connecting.
  </Property>
  <Property name="propertiesTransform" required="No" default="" sortOrder="alpha" since="3.1.4">
    An implementation of com.mysql.jdbc.ConnectionPropertiesTransform that the driver will use to modify URL properties passed to the driver before attempting a connection
  </Property>
  <Property name="useCompression" required="No" default="false" sortOrder="alpha" since="3.0.17">
    Use zlib compression when communicating with the server (true/false)? Defaults to 'false'.
  </Property>
 </PropertyCategory>
 <PropertyCategory name="Networking">
  <Property name="maxAllowedPacket" required="No" default="-1" sortOrder="alpha" since="5.1.8">
    Maximum allowed packet size to send to server. If not set, the value of system variable 'max_allowed_packet' will be used to initialize this upon connecting. This value will not take effect if set larger than the value of 'max_allowed_packet'.
  </Property>
  <Property name="tcpKeepAlive" required="No" default="true" sortOrder="alpha" since="5.0.7">
    If connecting using TCP/IP, should the driver set SO_KEEPALIVE?
  </Property>
  <Property name="tcpNoDelay" required="No" default="true" sortOrder="alpha" since="5.0.7">
    If connecting using TCP/IP, should the driver set SO_TCP_NODELAY (disabling the Nagle Algorithm)?
  </Property>
  <Property name="tcpRcvBuf" required="No" default="0" sortOrder="alpha" since="5.0.7">
    If connecting using TCP/IP, should the driver set SO_RCV_BUF to the given value? The default value of '0', means use the platform default value for this property)
  </Property>
  <Property name="tcpSndBuf" required="No" default="0" sortOrder="alpha" since="5.0.7">
    If connecting using TCP/IP, should the driver set SO_SND_BUF to the given value? The default value of '0', means use the platform default value for this property)
  </Property>
  <Property name="tcpTrafficClass" required="No" default="0" sortOrder="alpha" since="5.0.7">
    If connecting using TCP/IP, should the driver set traffic class or type-of-service fields ?See the documentation for java.net.Socket.setTrafficClass() for more information.
  </Property>
 </PropertyCategory>
 <PropertyCategory name="High Availability and Clustering">
  <Property name="autoReconnect" required="No" default="false" sortOrder="0" since="1.1">
    Should the driver try to re-establish stale and/or dead connections? If enabled the driver will throw an exception for a queries issued on a stale or dead connection, which belong to the current transaction, but will attempt reconnect before the next query issued on the connection in a new transaction. The use of this feature is not recommended, because it has side effects related to session state and data consistency when applications don't handle SQLExceptions properly, and is only designed to be used when you are unable to configure your application to handle SQLExceptions resulting from dead and stale connections properly. Alternatively, as a last option, investigate setting the MySQL server variable "wait_timeout" to a high value, rather than the default of 8 hours.
  </Property>
  <Property name="autoReconnectForPools" required="No" default="false" sortOrder="1" since="3.1.3">
    Use a reconnection strategy appropriate for connection pools (defaults to 'false')
  </Property>
  <Property name="failOverReadOnly" required="No" default="true" sortOrder="2" since="3.0.12">
    When failing over in autoReconnect mode, should the connection be set to 'read-only'?
  </Property>
  <Property name="maxReconnects" required="No" default="3" sortOrder="4" since="1.1">
    Maximum number of reconnects to attempt if autoReconnect is true, default is '3'.
  </Property>
  <Property name="reconnectAtTxEnd" required="No" default="false" sortOrder="4" since="3.0.10">
    If autoReconnect is set to true, should the driver attempt reconnections at the end of every transaction?
  </Property>
  <Property name="retriesAllDown" required="No" default="120" sortOrder="4" since="5.1.6">
    When using loadbalancing, the number of times the driver should cycle through available hosts, attempting to connect.  Between cycles, the driver will pause for 250ms if no servers are available.
  </Property>
  <Property name="initialTimeout" required="No" default="2" sortOrder="5" since="1.1">
    If autoReconnect is enabled, the initial time to wait between re-connect attempts (in seconds, defaults to '2').
  </Property>
  <Property name="roundRobinLoadBalance" required="No" default="false" sortOrder="5" since="3.1.2">
    When autoReconnect is enabled, and failoverReadonly is false, should we pick hosts to connect to on a round-robin basis?
  </Property>
  <Property name="queriesBeforeRetryMaster" required="No" default="50" sortOrder="7" since="3.0.2">
    Number of queries to issue before falling back to master when failed over (when using multi-host failover). Whichever condition is met first, 'queriesBeforeRetryMaster' or 'secondsBeforeRetryMaster' will cause an attempt to be made to reconnect to the master. Defaults to 50.
  </Property>
  <Property name="secondsBeforeRetryMaster" required="No" default="30" sortOrder="8" since="3.0.2">
    How long should the driver wait, when failed over, before attempting 
  </Property>
  <Property name="selfDestructOnPingMaxOperations" required="No" default="0" sortOrder="2147483647" since="5.1.6">
    =If set to a non-zero value, the driver will report close the connection and report failure when Connection.ping() or Connection.isValid(int) is called if the connection's count of commands sent to the server exceeds this value.
  </Property>
  <Property name="selfDestructOnPingSecondsLifetime" required="No" default="0" sortOrder="2147483647" since="5.1.6">
    If set to a non-zero value, the driver will report close the connection and report failure when Connection.ping() or Connection.isValid(int) is called if the connection's lifetime exceeds this value.
  </Property>
  <Property name="resourceId" required="No" default="" sortOrder="alpha" since="5.0.1">
    A globally unique name that identifies the resource that this datasource or connection is connected to, used for XAResource.isSameRM() when the driver can't determine this value based on hostnames used in the URL
  </Property>
 </PropertyCategory>
 <PropertyCategory name="Security">
  <Property name="allowMultiQueries" required="No" default="false" sortOrder="1" since="3.1.1">
    Allow the use of ';' to delimit multiple queries during one statement (true/false), defaults to 'false', and does not affect the addBatch() and executeBatch() methods, which instead rely on rewriteBatchStatements.
  </Property>
  <Property name="useSSL" required="No" default="false" sortOrder="2" since="3.0.2">
    Use SSL when communicating with the server (true/false), defaults to 'false'
  </Property>
  <Property name="requireSSL" required="No" default="false" sortOrder="3" since="3.1.0">
    Require SSL connection if useSSL=true? (defaults to 'false').
  </Property>
  <Property name="verifyServerCertificate" required="No" default="true" sortOrder="4" since="5.1.6">
    If "useSSL" is set to "true", should the driver verify the server's certificate? When using this feature, the keystore parameters should be specified by the "clientCertificateKeyStore*" properties, rather than system properties.
  </Property>
  <Property name="clientCertificateKeyStoreUrl" required="No" default="" sortOrder="5" since="5.1.0">
    URL to the client certificate KeyStore (if not specified, use defaults)
  </Property>
  <Property name="clientCertificateKeyStoreType" required="No" default="JKS" sortOrder="6" since="5.1.0">
    KeyStore type for client certificates (NULL or empty means use the default, which is "JKS". Standard keystore types supported by the JVM are "JKS" and "PKCS12", your environment may have more available depending on what security products are installed and available to the JVM.
  </Property>
  <Property name="clientCertificateKeyStorePassword" required="No" default="" sortOrder="7" since="5.1.0">
    Password for the client certificates KeyStore
  </Property>
  <Property name="trustCertificateKeyStoreUrl" required="No" default="" sortOrder="8" since="5.1.0">
    URL to the trusted root certificate KeyStore (if not specified, use defaults)
  </Property>
  <Property name="trustCertificateKeyStoreType" required="No" default="JKS" sortOrder="9" since="5.1.0">
    KeyStore type for trusted root certificates (NULL or empty means use the default, which is "JKS". Standard keystore types supported by the JVM are "JKS" and "PKCS12", your environment may have more available depending on what security products are installed and available to the JVM.
  </Property>
  <Property name="trustCertificateKeyStorePassword" required="No" default="" sortOrder="10" since="5.1.0">
    Password for the trusted root certificates KeyStore
  </Property>
  <Property name="allowLoadLocalInfile" required="No" default="true" sortOrder="2147483647" since="3.0.3">
    Should the driver allow use of 'LOAD DATA LOCAL INFILE...' (defaults to 'true').
  </Property>
  <Property name="allowUrlInLocalInfile" required="No" default="false" sortOrder="2147483647" since="3.1.4">
    Should the driver allow URLs in 'LOAD DATA LOCAL INFILE' statements?
  </Property>
  <Property name="paranoid" required="No" default="false" sortOrder="alpha" since="3.0.1">
    Take measures to prevent exposure sensitive information in error messages and clear data structures holding sensitive data when possible? (defaults to 'false')
  </Property>
  <Property name="passwordCharacterEncoding" required="No" default="" sortOrder="alpha" since="5.1.7">
    What character encoding is used for passwords? Leaving this set to the default value (null), uses the platform character set, which works for ISO8859_1 (i.e. "latin1") passwords. For passwords in other character encodings, the encoding will have to be specified with this property, as it's not possible for the driver to auto-detect this.
  </Property>
 </PropertyCategory>
 <PropertyCategory name="Performance Extensions">
  <Property name="callableStmtCacheSize" required="No" default="100" sortOrder="5" since="3.1.2">
    If 'cacheCallableStmts' is enabled, how many callable statements should be cached?
  </Property>

Mój kod połączenia się z bazą danych:

import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.*;
public class JDBCExample {
 
  public static void main(String[] args) {
 
 
	try {
		Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
	} catch (ClassNotFoundException e) {
		System.out.println("Where is your MySQL JDBC Driver?");
		e.printStackTrace();
		return;
	}
 
	System.out.println("MySQL JDBC Driver Registered!");
	Connection connection = null;
 
	try {
		connection = DriverManager
		.getConnection("jdbc::/mysql/localhost","baza","hasło");
 
	} catch (SQLException e) {
		System.out.println("Connection Failed! Check output console");
		e.printStackTrace();
		return;
	}
 
	if (connection != null) {
		System.out.println("You made it, take control your database now!");
	} else {
		System.out.println("Failed to make connection!");
	}
  }
}

Dodam , że dodałem bibliotekę : mysql-connector-java-5.1.25-bin.jar

Pozdrawiam

0

sprawdz

Class.forName("com.mysql.jdbc.Driver");

oraz

.getConnection("jdbc:mysql://localhost/mysql","user","password"); 
0

Niestety nie pomogło;/

0

A co wypisuje

e.printStackTrace();
0

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(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1121)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:357)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2479)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2516)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2301)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:346)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at MailDB.DBConnect.<init>(DBConnect.java:21)
at MailDB.main.main(main.java:11)
Caused by: java.net.ConnectException: Connection refused: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(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 java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:259)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:307)
... 16 more
java.lang.NullPointerException
at MailDB.DBConnect.getData(DBConnect.java:35)
at MailDB.main.main(main.java:12)

0

I ma ktoś jakiś pomysł ?

0

jak wyglada sciezka do bazy danych ?

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