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public static void printJar(Object o) {
String className = o.getClass().getName();
String classNamePath = className.replace(".", "/") + ".class";
URL is = o.getClass().getClassLoader().getResource(classNamePath);
String ppath = is.getFile();
ppath = org.apache.commons.lang3.StringUtils.replace(ppath, "%20", " ");
logger.info("类所在的jar为");
logger.info(org.apache.commons.lang3.StringUtils.removeStart(ppath, "/"));
}连接MySQL错误create connection SQLException, url: jdbc:mysql://localhost:3306/*****?
具体报错如下：
2018-11-12 16:14:21.704 ERROR 9752 --- [eate-1537371824] com.alibaba.druid.pool.DruidDataSource : create connection SQLException, url: jdbc:mysql://localhost:3306/*****?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&useSSL=false, errorCode 1193, state HY000
java.sql.SQLException: Unknown system variable 'query_cache_size'
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3878)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2478)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2625)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2547)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2505)
at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1370)
at com.mysql.jdbc.ConnectionImpl.loadServerVariables(ConnectionImpl.java:3862)
at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3290)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2299)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2085)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:795)
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:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:400)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:327)
at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:156)
at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:218)
at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:150)
at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1560)
at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1623)
at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2468)
解决方法
本人是MySQL版本问题,用的是MySQL8.0,将MySQL驱动改成如下:5.1.6
<!--MySQL驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>修改后的连接信息如下:
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driverClassName: com.mysql.jdbc.Driver
druid:
first: #数据源1
url: jdbc:mysql://localhost:3306/数据库名称?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8
username: *****
password: *****
........................or 2020/05/28 加
spring:
http:
encoding:
charset: UTF-8
force: true
enabled: true
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driverClassName: com.mysql.jdbc.Driverplatform: mysql
url: jdbc:mysql://127.0.0.1:3306/数据库名称?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull&serverTimezone=GMT%2B8
username: XXXXXX
password: XXXXXX
#初始化链接数
initialSize: 5
#最小的空闲连接数
minIdle: 5
#最大活动连接数
maxActive: 20
#从池中取连接的最大等待时间，单位ms
maxWait: 60000
#每XXms运行一次空闲连接回收器
timeBetweenEvictionRunsMillis: 60000
#池中的连接空闲XX毫秒后被回收
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT1FROMDUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
filters: stat,wall,log4j
logSlowSql: true
以上为个人经验，希望能给大家一个参考，也希望大家多多支持。
