Hibernate java.sql.SQLException:通过tomcat连接时没有数据库选择异常
我得到以下例外:Hibernate java.sql.SQLException:通过tomcat连接时没有数据库选择异常,hibernate,mariadb,Hibernate,Mariadb,我得到以下例外: Caused by: java.sql.SQLException: No database selected at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:996) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887) at com.mysql.jdbc.MysqlIO.checkErro
Caused by: java.sql.SQLException: No database selected
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:996)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2530)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1907)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2030)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:82)
... 52 more
我将CentOS 7与MariaDB(tomcat8/java8)一起使用。我更改了maria db的my.cnf中的默认端口,然后->发生了此异常。我使用hibernate,并且已经在hibernate.cfg.xml中更改了端口
是否可以通过其他端口连接到mysql?而不是3306,或者不建议这样做
我已恢复到端口3306(默认),然后出现以下异常:
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 17,287 milliseconds ago. The last packet sent successfully to the server was 1 milliseconds ago.
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)
谢谢解决了 tomcat重启脚本(服务)就是问题所在。可能是服务器的重新启动不干净,连接池大小超出限制 手动执行shutdown.sh和startup.sh-问题“已解决”
谢谢大家! 看起来您的jdbc url不正确(连接字符串中缺少数据库名称)。它应该类似于jdbc:mysql://localhost/.jdbc url正确,数据库设置在localhost:3306/…之后。。。。我在catalina.out中发现以下错误:SQL错误:0,SQLState:08003 jdbc连接池可能有问题吗?