Java “司机”；com.mysql.jdbc.Driver“；不支持url"；空"；

Eclipse引发了以下异常

java.sql.SQLException: Driver "com.mysql.jdbc.Driver" does not support the url "null"

以下是my context.xml：

<?xml version="1.0" encoding="UTF-8"?>
<Context path="/advancedweb">
<Realm className="org.apache.catalina.realm.JDBCRealm" debug="99"
    driverName="com.mysql.jdbc.Driver"
    connectionUrl="jdbc:mysql://localhost:3306/saketramdurbha_test"
    connectionName="root" connectionPassword="pass"
    userTable="adminspass" userNameCol="Username" userCredCol="Password"
    userRoleTable="adminsrole" roleNameCol="Rolename" />
</Context>

---

连接URL

应该是

<?xml version="1.0" encoding="UTF-8"?>
<Context path="/advancedweb">
<Realm className="org.apache.catalina.realm.JDBCRealm" debug="99"
    driverName="com.mysql.jdbc.Driver"
    connectionURL="jdbc:mysql://localhost:3306/saketramdurbha_test"
    connectionName="root" connectionPassword="pass"
    userTable="adminspass" userNameCol="Username" userCredCol="Password"
    userRoleTable="adminsrole" roleNameCol="Rolename" />
</Context>