Jfinal 使用C3p0连接远程数据库时报错，连不上！前提是密码账号正确。

Question

[WARN]-[Thread: Task-Thread-for-com.mchange.v2.async.ThreadPerTaskAsynchronousRunner@113b108]-[com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run()]: com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask@11b7a14 -- Acquisition Attempt Failed!!! Clearing pending acquires. While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30). Last acquisition attempt exception: 

java.sql.SQLException: null,  message from server: "Host 'PHXJGCEYFF7C8GA' is not allowed to connect to this MySQL server"

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1073)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)

at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1136)

at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2395)

at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2428)

at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2213)

at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:797)

at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)

at sun.reflect.GeneratedConstructorAccessor2.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:389)

at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)

at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134)

at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)

at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)

at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)

at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)

at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)

at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)

at com.mchange.v2.async.ThreadPerTaskAsynchronousRunner$TaskThread.run(ThreadPerTaskAsynchronousRunner.java:255)

Answer 1

mysql配置里面有个ip的，默认是本机，你的把这个限制去掉重启！具体你可以google 

Answer 2

jdbcUrl = jdbc:mysql://192.168.0.105/jfinal_demo?characterEncoding=GBK&zeroDateTimeBehavior=convertToNull 链接URL 我只是改了一下ip，换成localhost或者127.0.0.1都行。

Answer 3

现在的问题是 可以链接本地MySql数据库， 但是连接其他电脑上的mysql就不行。

Answer 4

这是你的数据库连接问题，和C3p0没关系的吧

看一下你的数据库连接URL、用户名、密码

根据Exception，你这台电脑，不允许连接MySQL数据库

Answer 5

mysql配置里面有个ip的，默认是本机，你的把这个限制去掉重启！具体你可以google