Question

我试图为我的Mule应用程序实现错误处理策略，该应用程序将数据写入数据库。我有一个例子，当尝试插入具有重复标识符的记录时抛出异常：

ERROR 2014-03-17 16:02:15,990 [[processes].inputConnector.receiver.01] org.mule.exception.DefaultMessagingExceptionStrategy: 
********************************************************************************
Message               : Failed to route event via endpoint: DefaultOutboundEndpoint{endpointUri=jdbc://insertRecord, connector=JdbcConnector
{
  name=dbQueries
  lifecycle=start
  this=4c6f44a0
  numberOfConcurrentTransactedReceivers=4
  createMultipleTransactedReceivers=false
  connected=true
  supportedProtocols=[jdbc]
  serviceOverrides=<none>
}
,  name='endpoint.jdbc.insertRecord', mep=ONE_WAY, properties={queryTimeout=-1}, transactionConfig=Transaction{factory=null, action=INDIFFERENT, timeout=0}, deleteUnacceptedMessages=false, initialState=started, responseTimeout=10000, endpointEncoding=UTF-8, disableTransportTransformer=false}. Message payload is of type: HashMap
Code                  : MULE_ERROR--2
--------------------------------------------------------------------------------
Exception stack is:
1. The statement was aborted because it would have caused a duplicate key value in a unique or primary key constraint or unique index identified by 'SQL140317160209540' defined on 'TESTTABLE'. (org.apache.derby.iapi.error.StandardException)
  org.apache.derby.iapi.error.StandardException:-1 (null)
2. The statement was aborted because it would have caused a duplicate key value in a unique or primary key constraint or unique index identified by 'SQL140317160209540' defined on 'TESTTABLE'.(SQL Code: 30000, SQL State: + 23505) (org.apache.derby.impl.jdbc.EmbedSQLException)
  org.apache.derby.impl.jdbc.SQLExceptionFactory:-1 (null)
3. The statement was aborted because it would have caused a duplicate key value in a unique or primary key constraint or unique index identified by 'SQL140317160209540' defined on 'TESTTABLE'.(SQL Code: 30000, SQL State: + 23505) (java.sql.SQLIntegrityConstraintViolationException)
  org.apache.derby.impl.jdbc.SQLExceptionFactory40:-1 (null)
4. The statement was aborted because it would have caused a duplicate key value in a unique or primary key constraint or unique index identified by 'SQL140317160209540' defined on 'TESTTABLE'. Query: INSERT INTO TestTable (Id, Quantity) VALUES (?, ?) Parameters: [261000153085, 7](SQL Code: 30000, SQL State: + 23505) (java.sql.SQLException)
  org.apache.commons.dbutils.QueryRunner:540 (null)
5. Failed to route event via endpoint: DefaultOutboundEndpoint{endpointUri=jdbc://insertRecord, connector=JdbcConnector
{
  name=dbQueries
  lifecycle=start
  this=4c6f44a0
  numberOfConcurrentTransactedReceivers=4
  createMultipleTransactedReceivers=false
  connected=true
  supportedProtocols=[jdbc]
  serviceOverrides=<none>
}
,  name='endpoint.jdbc.insertRecord', mep=ONE_WAY, properties={queryTimeout=-1}, transactionConfig=Transaction{factory=null, action=INDIFFERENT, timeout=0}, deleteUnacceptedMessages=false, initialState=started, responseTimeout=10000, endpointEncoding=UTF-8, disableTransportTransformer=false}. Message payload is of type: HashMap (org.mule.api.transport.DispatchException)
  org.mule.transport.AbstractMessageDispatcher:109 (http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/transport/DispatchException.html)
--------------------------------------------------------------------------------
Root Exception stack trace:
ERROR 23505: The statement was aborted because it would have caused a duplicate key value in a unique or primary key constraint or unique index identified by 'SQL140317160209540' defined on 'TESTTABLE'.
    at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
    at org.apache.derby.impl.sql.execute.IndexChanger.insertAndCheckDups(Unknown Source)
    at org.apache.derby.impl.sql.execute.IndexChanger.doInsert(Unknown Source)
    + 3 more (set debug level logging or '-Dmule.verbose.exceptions=true' for everything)
********************************************************************************

我已经定义了一个选择异常策略来处理不同的异常，并使用以下方法来处理所概述的案例：

<catch-exception-strategy when="#[exception.causeMatches(org.apache.derby.*)]" doc:name="Catch Exception Strategy">         
     <logger level="ERROR" message="Database error." doc:name="Logger"/>
</catch-exception-strategy>

但是，异常总是被路由到默认策略而不是上面定义的catch策略。我认为这是我的问题所在＆＃39;当＆＃39;表达，我只是不确定如何解决它。任何帮助，将不胜感激。感谢

Answer 1

这是一种以正则表达式作为参数的方法。

尝试使用它，它应该可以工作。

<catch-exception-strategy when="#[exception.causeMatches('org.?apache.?derby.?.*')]" doc:name="Catch Exception Strategy">         
     <logger level="ERROR" message="Database error." doc:name="Logger"/>
</catch-exception-strategy>

希望这有帮助。

Answer 2

您需要一个方法causeMatches的String参数：

http://www.mulesoft.org/docs/site/current3/apidocs/org/mule/api/MessagingException.html

尝试使用引号：exception.causeMatches（＆＃39; org.apache.derby。*＆＃39;）

Answer 3

如果错误是

java.sql.SQLIntegrityConstraintViolationException: ORA-00001: unique constraint violated

这可以通过在代码中使用条件来帮助处理，如图所示使用错误中的重要关键字：

catch (SQLException e) { 
    if(e.getMessage().contains("unique constraint")) {        
        System.out.println("PID Repeated. Enter a different PID");
    } 
    return -1; 
}

没有为指定的异常调用Mule - Catch Exception策略

3 个答案: