Java 无法使用通过Tomcat部署的Spring应用程序访问本地MySQL数据库_Java_Mysql_Spring_Hibernate_Tomcat

Java 无法使用通过Tomcat部署的Spring应用程序访问本地MySQL数据库

java mysql spring hibernate tomcat

Java 无法使用通过Tomcat部署的Spring应用程序访问本地MySQL数据库,java,mysql,spring,hibernate,tomcat,Java,Mysql,Spring,Hibernate,Tomcat,我正在尝试使用Spring和Hibernate创建一个web应用程序，并通过Tomcat8进行部署。我已经在我的机器上本地安装了MySQL和Tomcat8，并且能够将web应用程序部署到机器上。由于应用程序/tomcat无法连接到数据库，应用程序无法启动下面是安装教程（使用Hibernate 4）：当我尝试部署应用程序时，我收到以下错误，我将其缩写为发生的第一个错误： 2015-07-27 20:42:46.768 INFO 77092 --- [n(11)-127.0.0.1] o.h.

我正在尝试使用Spring和Hibernate创建一个web应用程序，并通过Tomcat8进行部署。我已经在我的机器上本地安装了MySQL和Tomcat8，并且能够将web应用程序部署到机器上。由于应用程序/tomcat无法连接到数据库，应用程序无法启动

下面是安装教程（使用Hibernate 4）：

当我尝试部署应用程序时，我收到以下错误，我将其缩写为发生的第一个错误：

2015-07-27 20:42:46.768  INFO 77092 --- [n(11)-127.0.0.1] o.h.s.j.c.i.ConnectionProviderInitiator  : HHH000130: Instantiating explicit connection provider: org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider
2015-07-27 20:42:46.794  WARN 77092 --- [n(11)-127.0.0.1] o.h.e.jdbc.internal.JdbcServicesImpl     : HHH000342: Could not obtain connection to query metadata : Communications link failure
27-Jul-2015 20:42:46.793 SEVERE [RMI TCP Connection(11)-127.0.0.1] org.apache.tomcat.jdbc.pool.ConnectionPool.init Unable to create initial connections of pool.

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.

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:400)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1038)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:339)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2247)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2280)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2079)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:794)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
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:400)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:399)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:325)
at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:307)
at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:200)
at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:699)
at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:633)
at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:484)
at org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:142)
at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:115)
at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:102)
at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:126)
at org.hibernate.ejb.connection.InjectedDataSourceConnectionProvider.getConnection(InjectedDataSourceConnectionProvider.java:70)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl$ConnectionProviderJdbcConnectionAccess.obtainConnection(JdbcServicesImpl.java:242)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:117)
at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:85)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:184)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:156)
at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1827)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1785)
at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:96)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:915)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:900)
at org.springframework.orm.jpa.vendor.SpringHibernateEjbPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateEjbPersistenceProvider.java:51)
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:343)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:318)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1633)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:956)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:747)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
at org.springframework.boot.context.web.SpringBootServletInitializer.run(SpringBootServletInitializer.java:119)
at org.springframework.boot.context.web.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:110)
at org.springframework.boot.context.web.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:69)
at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:175)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5156)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1648)
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:483)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:463)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:413)
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:483)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1466)
at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1307)
at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1399)
at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:828)
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:483)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:323)
at sun.rmi.transport.Transport$1.run(Transport.java:178)
at sun.rmi.transport.Transport$1.run(Transport.java:175)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:174)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:557)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:812)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:671)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
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 com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:214)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:298)
... 95 more

MySQL超时：

mysql -u root -p
Enter password: 

mysql> USE myDatabase
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> SHOW TABLES;
+--------------------------+
| Tables_in_gofeisda_fionn |
+--------------------------+
| User                     |
+--------------------------+
1 row in set (0.00 sec)

mysql> show global variables like '%timeout%';
+---------------------------------+-------------------+
| Variable_name                   | Value             |
+---------------------------------+-------------------+
| connect_timeout                 | 10                |
| delayed_insert_timeout          | 300               |
| innodb_flush_log_at_timeout     | 1                 |
| innodb_lock_wait_timeout        | 50                |
| innodb_rollback_on_timeout      | OFF               |
| interactive_timeout             | 28800             |
| lock_wait_timeout               | 31536000          |
| net_read_timeout                | 30                |
| net_write_timeout               | 60                |
| rpl_stop_slave_timeout          | 31536000          |
| slave_net_timeout               | 3600              |
| slow_launch_time                | 2                 |
| wait_timeout                    | 28800             |
+---------------------------------+-------------------+
13 rows in set (0.00 sec)

mysql> show global variables like '%network%';
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| skip_networking | OFF   |
+-----------------+-------+
1 row in set (0.00 sec)

mysql> select user();
+----------------+
| user()         |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.01 sec)

检查MySQL超时：

mysql -u root -p
Enter password: 

mysql> USE myDatabase
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> SHOW TABLES;
+--------------------------+
| Tables_in_gofeisda_fionn |
+--------------------------+
| User                     |
+--------------------------+
1 row in set (0.00 sec)

mysql> show global variables like '%timeout%';
+---------------------------------+-------------------+
| Variable_name                   | Value             |
+---------------------------------+-------------------+
| connect_timeout                 | 10                |
| delayed_insert_timeout          | 300               |
| innodb_flush_log_at_timeout     | 1                 |
| innodb_lock_wait_timeout        | 50                |
| innodb_rollback_on_timeout      | OFF               |
| interactive_timeout             | 28800             |
| lock_wait_timeout               | 31536000          |
| net_read_timeout                | 30                |
| net_write_timeout               | 60                |
| rpl_stop_slave_timeout          | 31536000          |
| slave_net_timeout               | 3600              |
| slow_launch_time                | 2                 |
| wait_timeout                    | 28800             |
+---------------------------------+-------------------+
13 rows in set (0.00 sec)

mysql> show global variables like '%network%';
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| skip_networking | OFF   |
+-----------------+-------+
1 row in set (0.00 sec)

mysql> select user();
+----------------+
| user()         |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.01 sec)

检查MySQL主机：

mysql -u root -p
Enter password: 

mysql> USE myDatabase
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> SHOW TABLES;
+--------------------------+
| Tables_in_gofeisda_fionn |
+--------------------------+
| User                     |
+--------------------------+
1 row in set (0.00 sec)

mysql> show global variables like '%timeout%';
+---------------------------------+-------------------+
| Variable_name                   | Value             |
+---------------------------------+-------------------+
| connect_timeout                 | 10                |
| delayed_insert_timeout          | 300               |
| innodb_flush_log_at_timeout     | 1                 |
| innodb_lock_wait_timeout        | 50                |
| innodb_rollback_on_timeout      | OFF               |
| interactive_timeout             | 28800             |
| lock_wait_timeout               | 31536000          |
| net_read_timeout                | 30                |
| net_write_timeout               | 60                |
| rpl_stop_slave_timeout          | 31536000          |
| slave_net_timeout               | 3600              |
| slow_launch_time                | 2                 |
| wait_timeout                    | 28800             |
+---------------------------------+-------------------+
13 rows in set (0.00 sec)

mysql> show global variables like '%network%';
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| skip_networking | OFF   |
+-----------------+-------+
1 row in set (0.00 sec)

mysql> select user();
+----------------+
| user()         |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.01 sec)

检查MySQL端口

mysql> show variables like '%port%';
+---------------------+-------+
| Variable_name       | Value |
+---------------------+-------+
| innodb_support_xa   | ON    |
| large_files_support | ON    |
| port                | 3307  |
| report_host         |       |
| report_password     |       |
| report_port         | 3307  |
| report_user         |       |
+---------------------+-------+
7 rows in set (0.01 sec)

$ ping localhost
PING localhost (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.058 ms
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.054 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.202 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.071 ms
64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.119 ms
64 bytes from 127.0.0.1: icmp_seq=5 ttl=64 time=0.222 ms
^C
--- localhost ping statistics ---
6 packets transmitted, 6 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.054/0.121/0.222/0.068 ms

$ ping localhost:3307
PING localhost:3307 (198.105.254.228): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
Request timeout for icmp_seq 5
^C
--- localhost:3307 ping statistics ---
7 packets transmitted, 0 packets received, 100.0% packet loss

选中跳过联网

mysql> show global variables like '%skip%';
+------------------------+-------+
| Variable_name          | Value |
+------------------------+-------+
| skip_external_locking  | ON    |
| skip_name_resolve      | OFF   |
| skip_networking        | OFF   |
| skip_show_database     | OFF   |
| slave_skip_errors      | OFF   |
| sql_slave_skip_counter | 0     |
+------------------------+-------+
6 rows in set (0.00 sec)

Ping检查 127.0.0.1

$ ping 127.0.0.1
PING 127.0.0.1 (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.079 ms
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.194 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.200 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.166 ms
64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.171 ms
64 bytes from 127.0.0.1: icmp_seq=5 ttl=64 time=0.216 ms
^C
--- 127.0.0.1 ping statistics ---
6 packets transmitted, 6 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.079/0.171/0.216/0.045 ms

localhost

mysql> show variables like '%port%';
+---------------------+-------+
| Variable_name       | Value |
+---------------------+-------+
| innodb_support_xa   | ON    |
| large_files_support | ON    |
| port                | 3307  |
| report_host         |       |
| report_password     |       |
| report_port         | 3307  |
| report_user         |       |
+---------------------+-------+
7 rows in set (0.01 sec)

$ ping localhost
PING localhost (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.058 ms
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.054 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.202 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.071 ms
64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.119 ms
64 bytes from 127.0.0.1: icmp_seq=5 ttl=64 time=0.222 ms
^C
--- localhost ping statistics ---
6 packets transmitted, 6 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.054/0.121/0.222/0.068 ms

$ ping localhost:3307
PING localhost:3307 (198.105.254.228): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
Request timeout for icmp_seq 5
^C
--- localhost:3307 ping statistics ---
7 packets transmitted, 0 packets received, 100.0% packet loss

localhost MySQL端口

mysql> show variables like '%port%';
+---------------------+-------+
| Variable_name       | Value |
+---------------------+-------+
| innodb_support_xa   | ON    |
| large_files_support | ON    |
| port                | 3307  |
| report_host         |       |
| report_password     |       |
| report_port         | 3307  |
| report_user         |       |
+---------------------+-------+
7 rows in set (0.01 sec)

$ ping localhost
PING localhost (127.0.0.1): 56 data bytes
64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.058 ms
64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.054 ms
64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.202 ms
64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.071 ms
64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.119 ms
64 bytes from 127.0.0.1: icmp_seq=5 ttl=64 time=0.222 ms
^C
--- localhost ping statistics ---
6 packets transmitted, 6 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.054/0.121/0.222/0.068 ms

$ ping localhost:3307
PING localhost:3307 (198.105.254.228): 56 data bytes
Request timeout for icmp_seq 0
Request timeout for icmp_seq 1
Request timeout for icmp_seq 2
Request timeout for icmp_seq 3
Request timeout for icmp_seq 4
Request timeout for icmp_seq 5
^C
--- localhost:3307 ping statistics ---
7 packets transmitted, 0 packets received, 100.0% packet loss

我还需要什么来确保数据库/tomcat/应用程序设置正确

更新1:

mysql -u root -p
Enter password: 

mysql> USE myDatabase
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> SHOW TABLES;
+--------------------------+
| Tables_in_gofeisda_fionn |
+--------------------------+
| User                     |
+--------------------------+
1 row in set (0.00 sec)

mysql> show global variables like '%timeout%';
+---------------------------------+-------------------+
| Variable_name                   | Value             |
+---------------------------------+-------------------+
| connect_timeout                 | 10                |
| delayed_insert_timeout          | 300               |
| innodb_flush_log_at_timeout     | 1                 |
| innodb_lock_wait_timeout        | 50                |
| innodb_rollback_on_timeout      | OFF               |
| interactive_timeout             | 28800             |
| lock_wait_timeout               | 31536000          |
| net_read_timeout                | 30                |
| net_write_timeout               | 60                |
| rpl_stop_slave_timeout          | 31536000          |
| slave_net_timeout               | 3600              |
| slow_launch_time                | 2                 |
| wait_timeout                    | 28800             |
+---------------------------------+-------------------+
13 rows in set (0.00 sec)

mysql> show global variables like '%network%';
+-----------------+-------+
| Variable_name   | Value |
+-----------------+-------+
| skip_networking | OFF   |
+-----------------+-------+
1 row in set (0.00 sec)

mysql> select user();
+----------------+
| user()         |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.01 sec)

遵循此处概述的说明：

我使用127.0.0.1将bind address参数添加到配置文件中，并将端口设置为3306。我认为这不起作用，因为重新启动MySQL后，端口仍然设置为3307

让我们从第一原则来看这一点

您正在使用的JDBC URL，表示您正在尝试连接到“localhost:3307”

java.net.ConnectException:Connection-densed

表示数据库没有侦听客户端试图使用的IP地址和端口号上的请求

那为什么会出问题呢

可能是数据库根本没有运行，但您可能已经消除了这一点。（您可以从命令行运行
```
mysql
```
客户端？）
可能是您（或某人）错误地将
```
localhost
```
配置为解析为
```
127.0.0.1
```
以外的内容。（有些人做疯狂的事…）
但我认为最可能的解释是MySQL没有监听127.0.0.1请求

确保这一点的一种方法是启动数据库，然后运行“netstat-an | grep LISTEN | grep tcp”。这将显示当前正在“侦听”的所有IP地址和端口号。确保包含您尝试使用的地址/端口组合

（请注意，IPv4地址

0.0.0.0

表示任何地址。它是一个通配符。）

一旦您弄清楚服务器正在监听什么，您就可以决定是更改JDBCURL以匹配它，还是让服务器监听您想要使用的IP/端口

其他人则认为用户名和密码有问题。这些建议都是骗人的。如果这就是问题所在，那么例外情况就不同了。

它对我有效

确保您的MySql服务器已启动，如果未启动，请转到控制面板->服务并搜索Mysql80并启动它。

我已解决此问题更新

my.cnf

文件搜索：

跳过联网

并将其更新为：

#跳过网络

最后重新启动

Mysql

您是否在Mysql配置文件my.cnf中取消了bind address指令的注释？既然您在控制台上连接了用户root，您是否尝试在配置中将其用作连接用户和密码？另外，您是否在Mysql上创建了用户pankaj？你试过在mysql控制台上连接它吗？在OS X上my.cnf会在哪里？我创建了一个my.cnf，并在这里填写了说明，然后重新启动了mysql服务。我在命令行中仔细检查了MySQL，它正在运行。我可以使用“mysql-u root-p”登录。我仔细检查了localhost，它被设置为127.0.0.1。运行netstat命令时，第一个清单正在监听127.0.0.1:3307。当我停止MySQL服务时，它不再列出。当我重新启动它时，它会再次列出。奇怪的是，我添加了/etc/my.cnf，其中只有“绑定地址=127.0.0.1”和“端口=3306”。这不应该将侦听端口设置为3306吗？