Oracle Database，又名Oracle RDBMS，或简称Oracle。是甲骨文公司的一款关系数据库管理系统。它是在数据库领域一直处于领先地位的产品。可以说Oracle数据库系统是目前世界上流行的关系数据库管理系统，系统可移植性好、使用方便、功能强，适用于各类大、中、小、微机环境。它是一种高效率、可靠性好的 适应高吞吐量的数据库解决方案。
启动 Tomcat 报错连接 Oracle 数据库错误，具体错误信息如下：
java.sql.SQLException: ORA-01017: invalid username/password; logon denied at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:111) at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:330) at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:282) at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:277) at oracle.jdbc.driver.T4CTTIoauthenticate.receiveOauth(T4CTTIoauthenticate.java:790) at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:361) at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:438) at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:164) at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:34) at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:752) at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:134) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182) at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171) at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137) at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014) at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32) at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810) at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)
1.首先确认 oracle 数据库账号密码输入是否正确
2.如果密码丢失，具体解决方案如下：
1）打开 sqlnet.ora 文件，查看 SQLNET.AUTHENTICATION_SERVICES 参数，如果 SQLNET.AUTHENTICATION_SERVICES= (NONE) 将其改为 SQLNET.AUTHENTICATION_SERVICES= (NTS) 2）在 SQL*Plus 中执行命令如下： SQL>conn/as sysdba (认证登录) SQL>alter user system identified by yoodb123; (按 Enter 回车键 system 账号密码改为 yoodb123 )
注意：scott 用户如果没有解锁也会报 ORA-01017: invalid username/password; logon denied 错误，使用system用户登录，执行 alter user scott account unlock 语句，但是解锁之后还是出错如下：
请输入用户名: scott 输入口令: ERROR: ORA-01017: invalid username/password; logon denied
使用上述1和2步骤即可解决此问题，就可以用scott用户正常登陆
