ORA-12519, TNS:no appropriate service handler found

When the concurrency is large, the following error occurs:

org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.GenericJDBCException: Could not open connection

 

ORA-12519, TNS:no appropriate service handler found
The Connection descriptor used by the client was:

 

Solution:

1.-- The number of connections allowed by the database
select value from v$parameter where name = 'processes'; determine if it is too small.

2. View the connection pool configuration

 <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="oracle.jdbc.OracleDriver"/>
        <property name="url" value="jdbc:oracle:thin:@xxxxxxxxxxxxxx"/>
        <property name="username" value="xxx"/>
        <property name="password" value="xxx"/>
        <property name="initialSize" value="20"/>
        <property name="maxActive" value="200"/><!--最大200个连接-->
        <property name="maxIdle" value="100"/><!--空闲时保持100个连接-->
        <property name="maxWait" value="3000"/>
        <property name="defaultAutoCommit" value="true"/>
        <property name="removeAbandoned" value="true"/>
    </bean>