报错： Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has timed out. 数据库连接超时
解决方法一：
[oracle@data ~]$ sqlplus / as sysdba——连接到数据库
SQL*Plus: Release 11.2.0.4.0 Production on Mon May 8 16:37:56 2017
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> select count(*) from v$process;——当前连接数
COUNT(*)
----------
128
SQL> select value from v$parameter where name = 'processes';——最大连接数
VALUE
--------------------------------------------------------------------------------
1000
如果最大连接数小鱼当前连接数的话，那么修改最大连接数。
alter system set processes = 300 scope = spfile;
修改后重启数据库
shutdown immediate;
startup;
exit退出
方法二：
修改配置文件中checkoutTime