问题
I am trying to write Java program to access a remote mySQL database using ssh tunneling.
Below is my code:
int lport = 5656;
int rport = 3306;
String rhost = "111.222.333.444";
String host = "111.222.333.444";
String user = "username";
String password = "password1234";
String dbUser = "mySQLuser";
String dbPass = "mySQLpassword1234";
String schema = "test_db";
Connection conn = null;
try {
Properties config = new Properties();
config.put("StrictHostKeyChecking", "no");
JSch jsch = new JSch();
jschSession = jsch.getSession(user, host, 22);
jschSession.setPassword(password);
jschSession.setConfig(config);
jschSession.connect();
logger.info("Connected");
int assigned_port = jschSession.setPortForwardingL(lport, rhost, rport);
logger.info("localhost:" + assigned_port + " -> " + rhost + ":" + rport);
logger.info("Port Forwarded");
Class.forName("com.mysql.jdbc.Driver").newInstance();
String url = "jdbc:mysql://localhost:" + rport + "/" + schema;
conn = DriverManager.getConnection(url, dbUser, dbPass);
logger.info("Database connection established");
Statement stmt = conn.createStatement();
String sql = "SELECT * FROM TEST_TABLE";
ResultSet rs = stmt.executeQuery(sql);
while(rs.next()) {
logger.info(rs.getInt(1) + " " + rs.getString(2));
}
rs.close();
stmt.close();
logger.info("DONE");
} catch (Exception e) {
e.printStackTrace();
logger.error(e.getMessage());
if (jschSession != null && jschSession.isConnected()) {
System.out.println("Closing SSH Connection during error");
logger.error("Closing SSH Connection during error");
jschSession.disconnect();
}
} finally {
if (conn != null && !conn.isClosed()) {
System.out.println("Closing Database Connection");
logger.info("Closing Database Connection");
conn.close();
}
if (jschSession != null && jschSession.isConnected()) {
System.out.println("Closing SSH Connection");
logger.info("Closing SSH Connection");
//jschSession.disconnect();
}
}
I am pretty sure that all the usernames and passwords are correct.
However, when I am trying to run the above code, it always fail in the following line:
conn = DriverManager.getConnection(url, dbUser, dbPass);
with the following exception:
INFO | jvm 1 | 2013/02/20 17:25:24 | java.sql.SQLException: Access denied for user 'mySQLuser'@'localhost' (using password: YES)
INFO | jvm 1 | 2013/02/20 17:25:24 | at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:946)
INFO | jvm 1 | 2013/02/20 17:25:24 | at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985)
INFO | jvm 1 | 2013/02/20 17:25:24 | at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:885)
INFO | jvm 1 | 2013/02/20 17:25:24 | at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3421)
INFO | jvm 1 | 2013/02/20 17:25:24 | at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1247)
INFO | jvm 1 | 2013/02/20 17:25:24 | at com.mysql.jdbc.Connection.createNewIO(Connection.java:2775)
INFO | jvm 1 | 2013/02/20 17:25:24 | at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
INFO | jvm 1 | 2013/02/20 17:25:24 | at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
INFO | jvm 1 | 2013/02/20 17:25:24 | at java.sql.DriverManager.getConnection(DriverManager.java:582)
INFO | jvm 1 | 2013/02/20 17:25:24 | at java.sql.DriverManager.getConnection(DriverManager.java:185)
INFO | jvm 1 | 2013/02/20 17:25:24 | at com.prject.testing.Test.<init>(Test.java:97)
INFO | jvm 1 | 2013/02/20 17:25:24 | at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
INFO | jvm 1 | 2013/02/20 17:25:24 | at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
INFO | jvm 1 | 2013/02/20 17:25:24 | at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
INFO | jvm 1 | 2013/02/20 17:25:24 | at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:76)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$4.run(AbstractAutowireCapableBeanFactory.java:997)
INFO | jvm 1 | 2013/02/20 17:25:24 | at java.security.AccessController.doPrivileged(Native Method)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:995)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:955)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:487)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:874)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:816)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:731)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:485)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:92)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:284)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1118)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:605)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:926)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:477)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:638)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:595)
INFO | jvm 1 | 2013/02/20 17:25:24 | at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:652)
I have also checked the mySQL, the "host" for the user "mySQLuser" has already set as "%" in the "User" table.
Could anyone give me some suggestions?
Update:
Adopting the suggestion from @bmorris591,
I have changed String url = "jdbc:mysql://localhost:" + rport + "/" + schema; into String url = "jdbc:mysql://localhost:" + lport + "/" + schema;
However, there is a new exception appear:
java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1997)
at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:573)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1044)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2775)
at com.mysql.jdbc.Connection.<init>(Connection.java:1555)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at com.project.testing.Test.<init>(Test.java:98)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:147)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:76)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$4.run(AbstractAutowireCapableBeanFactory.java:997)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:995)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:955)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:487)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:874)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:816)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:731)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:485)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:92)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:284)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1118)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:605)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:926)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:477)
at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:638)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:595)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:652)
at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:514)
at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:455)
at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:138)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at sun.reflect.GeneratedMethodAccessor120.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:270)
at org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:269)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
at org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:302)
at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:163)
at org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:117)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1200)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1026)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4421)
and still the error happened in this line of code:
conn = DriverManager.getConnection(url, dbUser, dbPass);
The error messages make me quite confuse,
Could any give me some more suggestions?
回答1:
It would seem to be that the error is on this line:
String url = "jdbc:mysql://localhost:" + rport + "/" + schema;
Given than rport is 3306, i.e. the mySQL port on the remote machine, you are connecting to
"jdbc:mysql://localhost:3306/" + schema;
Which is your local machine. You need to connect to:
String url = "jdbc:mysql://localhost:" + lport + "/" + schema;
Which would be the port on the local machine that forwards to 3306 on the remote machine.
回答2:
"mySQLuser"@"%" let's you connect from any remote host. You should have "mySQLuser"@"localhost" to be able to log in locally, which is the case when tunneling via SSH.
A default MySQL installation has an anonymous-user account with host of localhost, so when logging in locally, that is considered a more "specific" user. That is, without "mySQLuser"@"localhost" account, you are considered as the anonymous-user account.
来源：https://stackoverflow.com/questions/14976504/ssh-tunneling-to-remote-access-mysql-database