环境搭建 项目属性没有JavaBuildPath连接mysql报错

hyh

用的Myeclipse 按照教程导入项目前一切正常。导入项目后右击项目属性后没有Java Build Path 跳过此步骤后继续运行报错

ruyi574812039

是不在企业内网无法连接互联网的环境搭建？
如果是这样,建议搞一个非maven版本吧...

admin

非maven版本也提供了

hyh

admin 发表于 2018-9-6 10:06
非maven版本也提供了

用了非maven版本后 连接数据库还是错误  配置文件改了 数据库也建了 表也导了
[2018-09-06 14:44:28] [INFO] [com.alibaba.druid.pool.DruidDataSource:928] {dataSource-91} inited
[2018-09-06 14:44:28] [ERROR] [com.alibaba.druid.pool.DruidDataSource:2469] create connection SQLException, url: jdbc:mysql://localhost:3306/jeecg?useUnicode=true&characterEncoding=UTF-8, errorCode 0, state 08001
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
        at sun.reflect.GeneratedConstructorAccessor38.newInstance(Unknown Source)
        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:411)
        at com.mysql.jdbc.Util.getInstance(Util.java:386)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1015)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2575)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2311)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
        at sun.reflect.GeneratedConstructorAccessor35.newInstance(Unknown Source)
        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:411)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:347)
        at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:149)
        at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:218)
        at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:143)
        at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1515)
        at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1578)
        at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2466)
Caused by: java.lang.NullPointerException
        at com.mysql.jdbc.ConnectionImpl.getServerCharacterEncoding(ConnectionImpl.java:3286)
        at com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1987)
        at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1913)
        at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1290)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2493)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2526)