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When allowCredentials is true, allowedOrigins cannot contain the special value “*“ since that canno

Caused by: java.lang.IllegalArgumentException: When allowCredentials is true,allowedOrigins cannot contain the special value "*" since that cannot be set on the"Access-Control-Allow-Origin" response h

#bug
mysql: Character set ‘utf8‘ is not a compiled character set and is not specified in the ‘C:\Program

mysql: Character set 'utf8' is not a compiled character set and is not specified in the 'C:\Program Files\MySQL\MySQL Server 5.7\share\charsets\Index.xml' file

#mysql#bug
kettle-连接mysql数据库

kettle-连接mysql数据库

错误连接数据库 [xxx] : org.pentaho.di.core.exception.KettleDatabaseException: Error occurred while try

Error connecting to database: (using class oracle.jdbc.driver.OracleDriver)Listener refused the connection with the following error:ORA-12505, TNS:listener does not currently know of SID given in conn

#数据库#oracle
Failed to configure a DataSource: ‘url‘ attribute is not specified and no embedded datasource could

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could

#java#spring boot#bug
kettle-连接mysql数据库

kettle-连接mysql数据库

错误连接数据库 [xxx] : org.pentaho.di.core.exception.KettleDatabaseException: Error occurred while try

Error connecting to database: (using class oracle.jdbc.driver.OracleDriver)Listener refused the connection with the following error:ORA-12505, TNS:listener does not currently know of SID given in conn

#数据库#oracle
IntelliJ IDEA 2020.3.1 配置虚拟机参数信息

目录步骤1. 选择 Edit Configurations步骤2. 点击modify options步骤3.点步骤4.步骤5.步骤1. 选择 Edit Configurations步骤2. 点击modify options步骤3.点步骤4.步骤5.

#java#jvm#intellij idea
CentOS 7安装Mysql5.7数据库--yum方式(详细安装)

步骤一:删除之前的mysql残留如果你之前有安装过mysql请先阅读一下这篇文章: 卸载清理如果是第一次安装mysql请从步骤二开始阅读步骤二:升级一下系统版本和内核版本因为的的CentOS从官网下载的,可能比较老,安装其他软件的时候总是出现一些奇怪的问题,所以推荐升级。执行命令yum -y update稍微等待一下就好步骤三:下载并安装MySQL官方的 Yum Repositorywget -i

#linux#mysql#centos
说说你对线程安全的理解

说说你对线程安全的理解不是线程安全、应该是内存安全,堆是共享内存,可以被所有线程访问当多个线程访问一个对象时,如果不进行额外的同步控制或者其他的协调操作,调用这个对象的行为都可以获得正确的结果,我们就说这个对象是线程安全的堆是线程和进程共有的空间,分去全局堆和局部堆,全局堆就是所有没有分配的空间,局部堆就是用户分配的空间。堆在操作系统堆进程初始化的时候分配,运行过程中也可以向系统要额外的堆,但是用

#java#面试
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