现象：用户进入EBS登陆界面、注销或者点击某些OAF 的self-service类型界面，会偶尔遇到问题。
点击here查看具体异常信息：
其中会有诸如一下内容：
oracle.jbo.JboException: JBO-29000: Unexpected exception caught: oracle.apps.fnd.framework.OAException, msg=Application: FND, Message Name: FND_GENERIC_MESSAGE. Tokens: MESSAGE = java.sql.SQLException: Io exception: Connection
Error Page
Exception Details.
oracle.apps.fnd.framework.OAException: Application: FND, Message Name: SQL_PLSQL_ERROR. Tokens: ROUTINE = AppsConnectionManager.appsInitialize(int,int,int,int,Connection):-1,-1,-1,0,oracle.jdbc.driver.T4CConnection@17a6ac0; REASON = java.sql.SQLRecoverableException:
IO Error: C ERRNO = 17002; at oracle.apps.fnd.framework.server.OAExceptionUtils.processAOLJErrorStack(OAExceptionUtils.java:1025)
原因：（报错的环境确实是RAC架构）
FND_JDBC_USABLE_CHECK is set to false
in the DBC file in RAC environment.
TheFND_JDBC_USABLE_CHECK parameter governs whether a pl/sql query is performedbefore giving a connection to a client. The pool checks whether a connection isusable before handing it to a
client.This always involves checking that the connection is not null and is notclosed. If
FND_JDBC_USABLE_CHECKis set to true, then it also verifies that the connection can be used to
perform asimple PL/SQL query. (This parameter may have to be set to "true" inorder to clean up
connectionsto a database that has been restarted.)
Settingit to TRUE checks whether each connection is working OK before you give it to auser.
解决方法：
Set s_fnd_jdbc_usable_check to true in context.xml file.Run Autoconfig.Retest the issue.
参考：metalink：
1. "YouHave Encountered An Unexpected Error" - JBO-30003 Error While Login ToOracle Applications With Database RAC Implemented (Doc ID )
2. Error On OA Framework Pages - oracle.apps.fnd.framework.OAException, FND_GENERIC_MESSAGE, JBO-25036 (Doc ID )
3. Configuring and Managing E-Business Application Tier for RAC (Doc ID )
Sql Server 中 Internal Query Processor Error：The query processor encountered an unexpected error
A server error occurred.
Please contact the administrator.
sonarqube 汉化 An error has occurred. Please contact your administrator
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