问题
I've got a mule flow that queries an Oracle database, every once in awhile the Oracle database will get taken offline for maintenance but when it comes back up Mule will not try to re-establish a connection until I either restart the Mule service or re-deploy the flow.
In Mule Studio I saw there was a re-connection strategy... so I could just set it to retry forever like this...
<jdbc:connector name="JDBC" dataSource-ref="Oracle_Data_Source" validateConnections="true" queryTimeout="-1" pollingFrequency="0" doc:name="JDBC">
<reconnect-forever frequency="60000"/>
</jdbc:connector>
However, if Mule isn't able to connect to Oracle for an hour I'd sure like to get an email notification.
I figured I'd set the retry count to 60 times and try every minute so if Oracle was still down the connection will fail so that Mule catches the error and sends me an email...
However, when I tested this (flow below) the flow will fail after the number of retries is reached but the catch exception strategy doesn't get triggered.
<?xml version="1.0" encoding="UTF-8"?>
<mule xmlns:smtp="http://www.mulesoft.org/schema/mule/smtp" xmlns:jdbc="http://www.mulesoft.org/schema/mule/jdbc" xmlns="http://www.mulesoft.org/schema/mule/core" xmlns:doc="http://www.mulesoft.org/schema/mule/documentation"
xmlns:spring="http://www.springframework.org/schema/beans" version="CE-3.4.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-current.xsd
http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
http://www.mulesoft.org/schema/mule/jdbc http://www.mulesoft.org/schema/mule/jdbc/current/mule-jdbc.xsd
http://www.mulesoft.org/schema/mule/smtp http://www.mulesoft.org/schema/mule/smtp/current/mule-smtp.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder location="properties" />
<jdbc:oracle-data-source name="Oracle_Data_Source" user="${oracle.user}" password="${oracle.password}" url="${oracle.url}" transactionIsolation="UNSPECIFIED" doc:name="Oracle Data Source"/>
<jdbc:connector name="JDBC" dataSource-ref="Oracle_Data_Source" validateConnections="true" queryTimeout="-1" pollingFrequency="6000" doc:name="JDBC" >
<reconnect frequency="6000" count="5"/>
</jdbc:connector>
<flow name="oracle_to_formsFlow1" doc:name="oracle_to_formsFlow1" initialState="started">
<jdbc:inbound-endpoint queryTimeout="-1" pollingFrequency="1000" connector-ref="JDBC" doc:name="Database" queryKey="test">
<jdbc:query key="test" value="SELECT * FROM MULE_TRANSACTIONS"/>
</jdbc:inbound-endpoint>
<smtp:outbound-endpoint host="${smtp.server}" responseTimeout="10000" doc:name="SMTP" from="${smtp.from}" subject="Mule Test" to="${smtp.to}"/>
<catch-exception-strategy doc:name="Catch Exception Strategy">
<smtp:outbound-endpoint host="${smtp.server}" responseTimeout="10000" doc:name="SMTP" from="${smtp.from}" subject="Mule Error" to="${smtp.to}"/>
</catch-exception-strategy>
</flow>
Here's what happens...
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ Starting app 'oracle_to_forms' +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
INFO 2014-03-12 10:00:07,980 [main] org.mule.util.queue.TransactionalQueueManager: Starting ResourceManager
INFO 2014-03-12 10:00:07,986 [main] org.mule.util.queue.TransactionalQueueManager: Started ResourceManager
INFO 2014-03-12 10:00:07,988 [main] org.mule.transport.email.SmtpConnector: Connected: SmtpConnector
{
name=connector.smtp.mule.default
lifecycle=initialise
this=33d15244
numberOfConcurrentTransactedReceivers=4
createMultipleTransactedReceivers=true
connected=true
supportedProtocols=[smtp]
serviceOverrides=<none>
}
INFO 2014-03-12 10:00:07,989 [main] org.mule.transport.email.SmtpConnector: Starting: SmtpConnector
{
name=connector.smtp.mule.default
lifecycle=initialise
this=33d15244
numberOfConcurrentTransactedReceivers=4
createMultipleTransactedReceivers=true
connected=true
supportedProtocols=[smtp]
serviceOverrides=<none>
}
INFO 2014-03-12 10:00:07,989 [main] org.mule.lifecycle.AbstractLifecycleManager: Starting connector: connector.smtp.mule.default
ERROR 2014-03-12 10:00:09,147 [main] org.mule.retry.notifiers.ConnectNotifier: Failed to connect/reconnect: JdbcConnector
{
name=JDBC
lifecycle=initialise
this=2888efde
numberOfConcurrentTransactedReceivers=4
createMultipleTransactedReceivers=false
connected=false
supportedProtocols=[jdbc]
serviceOverrides=<none>
}
. Root Exception was: Cannot get connection for URL jdbc:oracle:thin:@//oradb:1741/ORACLEDB : IO Error: The Network Adapter could not establish the connection(SQL Code: 0, SQL State: + null). Type: class java.sql.SQLException
INFO 2014-03-12 10:00:09,147 [main] org.mule.retry.policies.SimpleRetryPolicy: Waiting for 6000ms before reconnecting. Failed attempt 1 of 5
ERROR 2014-03-12 10:00:16,152 [main] org.mule.retry.notifiers.ConnectNotifier: Failed to connect/reconnect: JdbcConnector
{
name=JDBC
lifecycle=initialise
this=2888efde
numberOfConcurrentTransactedReceivers=4
createMultipleTransactedReceivers=false
connected=false
supportedProtocols=[jdbc]
serviceOverrides=<none>
}
. Root Exception was: Cannot get connection for URL jdbc:oracle:thin:@//oradb:1741/ORACLEDB : IO Error: The Network Adapter could not establish the connection(SQL Code: 0, SQL State: + null). Type: class java.sql.SQLException
INFO 2014-03-12 10:00:16,153 [main] org.mule.retry.policies.SimpleRetryPolicy: Waiting for 6000ms before reconnecting. Failed attempt 2 of 5
ERROR 2014-03-12 10:00:23,158 [main] org.mule.retry.notifiers.ConnectNotifier: Failed to connect/reconnect: JdbcConnector
{
name=JDBC
lifecycle=initialise
this=2888efde
numberOfConcurrentTransactedReceivers=4
createMultipleTransactedReceivers=false
connected=false
supportedProtocols=[jdbc]
serviceOverrides=<none>
} . Root Exception was: Cannot get connection for URL jdbc:oracle:thin:@//oradb:1741/ORACLEDB : IO Error: The Network Adapter could not establish the connection(SQL Code: 0, SQL State: + null). Type: class java.sql.SQLException
INFO 2014-03-12 10:00:23,158 [main] org.mule.retry.policies.SimpleRetryPolicy: Waiting for 6000ms before reconnecting. Failed attempt 3 of 5
ERROR 2014-03-12 10:00:30,162 [main] org.mule.retry.notifiers.ConnectNotifier: Failed to connect/reconnect: JdbcConnector
{
name=JDBC
lifecycle=initialise
this=2888efde
numberOfConcurrentTransactedReceivers=4
createMultipleTransactedReceivers=false
connected=false
supportedProtocols=[jdbc]
serviceOverrides=<none>
}
. Root Exception was: Cannot get connection for URL jdbc:oracle:thin:@//oradb:1741/ORACLEDB : IO Error: The Network Adapter could not establish the connection(SQL Code: 0, SQL State: + null). Type: class java.sql.SQLException
INFO 2014-03-12 10:00:30,163 [main] org.mule.retry.policies.SimpleRetryPolicy: Waiting for 6000ms before reconnecting. Failed attempt 4 of 5
ERROR 2014-03-12 10:00:37,168 [main] org.mule.retry.notifiers.ConnectNotifier: Failed to connect/reconnect: JdbcConnector
{
name=JDBC
lifecycle=initialise
this=2888efde
numberOfConcurrentTransactedReceivers=4
createMultipleTransactedReceivers=false
connected=false
supportedProtocols=[jdbc]
serviceOverrides=<none>
}
. Root Exception was: Cannot get connection for URL jdbc:oracle:thin:@//oradb:1741/ORACLEDB : IO Error: The Network Adapter could not establish the connection(SQL Code: 0, SQL State: + null). Type: class java.sql.SQLException
INFO 2014-03-12 10:00:37,168 [main] org.mule.retry.policies.SimpleRetryPolicy: Waiting for 6000ms before reconnecting. Failed attempt 5 of 5
ERROR 2014-03-12 10:00:44,173 [main] org.mule.retry.notifiers.ConnectNotifier: Failed to connect/reconnect: JdbcConnector
{
name=JDBC
lifecycle=initialise
this=2888efde
numberOfConcurrentTransactedReceivers=4
createMultipleTransactedReceivers=false
connected=false
supportedProtocols=[jdbc]
serviceOverrides=<none>
}
. Root Exception was: Cannot get connection for URL jdbc:oracle:thin:@//oradb:1741/ORACLEDB : IO Error: The Network Adapter could not establish the connection(SQL Code: 0, SQL State: + null). Type: class java.sql.SQLException
ERROR 2014-03-12 10:00:44,178 [main] org.mule.module.launcher.application.DefaultMuleApplication: null
java.sql.SQLException: Cannot get connection for URL jdbc:oracle:thin:@//oradb:1741/ORACLEDB : IO Error: The Network Adapter could not establish the connection
at org.enhydra.jdbc.standard.StandardDataSource.getConnection(StandardDataSource.java:216)
at org.enhydra.jdbc.standard.StandardDataSource.getConnection(StandardDataSource.java:144)
at org.mule.transport.jdbc.JdbcConnector.getConnection(JdbcConnector.java:254)
at org.mule.transport.jdbc.JdbcConnector.doConnect(JdbcConnector.java:377)
at org.mule.transport.AbstractConnector$5.doWork(AbstractConnector.java:1556)
at org.mule.retry.policies.AbstractPolicyTemplate.execute(AbstractPolicyTemplate.java:67)
at org.mule.transport.AbstractConnector.connect(AbstractConnector.java:1616)
at org.mule.transport.AbstractConnector.start(AbstractConnector.java:428)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.mule.lifecycle.phases.DefaultLifecyclePhase.applyLifecycle(DefaultLifecyclePhase.java:225)
at org.mule.lifecycle.RegistryLifecycleManager$RegistryLifecycleCallback.onTransition(RegistryLifecycleManager.java:276)
at org.mule.lifecycle.RegistryLifecycleManager.invokePhase(RegistryLifecycleManager.java:155)
at org.mule.lifecycle.RegistryLifecycleManager.fireLifecycle(RegistryLifecycleManager.java:126)
at org.mule.registry.AbstractRegistryBroker.fireLifecycle(AbstractRegistryBroker.java:80)
at org.mule.registry.MuleRegistryHelper.fireLifecycle(MuleRegistryHelper.java:120)
at org.mule.lifecycle.MuleContextLifecycleManager$MuleContextLifecycleCallback.onTransition(MuleContextLifecycleManager.java:94)
at org.mule.lifecycle.MuleContextLifecycleManager$MuleContextLifecycleCallback.onTransition(MuleContextLifecycleManager.java:90)
at org.mule.lifecycle.MuleContextLifecycleManager.invokePhase(MuleContextLifecycleManager.java:72)
at org.mule.lifecycle.MuleContextLifecycleManager.fireLifecycle(MuleContextLifecycleManager.java:64)
at org.mule.DefaultMuleContext.start(DefaultMuleContext.java:255)
at org.mule.module.launcher.application.DefaultMuleApplication.start(DefaultMuleApplication.java:147)
at org.mule.module.launcher.application.ApplicationWrapper.start(ApplicationWrapper.java:107)
at org.mule.module.launcher.DefaultMuleDeployer.deploy(DefaultMuleDeployer.java:48)
at org.mule.tooling.server.application.ApplicationDeployer.run(ApplicationDeployer.java:58)
at org.mule.tooling.server.application.ApplicationDeployer.main(ApplicationDeployer.java:91)
INFO 2014-03-12 10:00:44,180 [main] org.mule.module.launcher.application.DefaultMuleApplication:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ Disposing app 'oracle_to_forms' +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
INFO 2014-03-12 10:00:44,180 [main] org.mule.lifecycle.AbstractLifecycleManager: Disposing RegistryBroker
INFO 2014-03-12 10:00:44,191 [main] org.mule.config.spring.MuleApplicationContext: Closing org.mule.config.spring.MuleApplicationContext@6027b534: startup date [Wed Mar 12 10:00:05 PDT 2014]; root of context hierarchy
INFO 2014-03-12 10:00:44,193 [main] org.mule.construct.FlowConstructLifecycleManager: Disposing flow: oracle_to_formsFlow1
INFO 2014-03-12 10:00:44,194 [main] org.mule.processor.SedaStageLifecycleManager: Disposing service: oracle_to_formsFlow1.stage1
INFO 2014-03-12 10:00:44,195 [main] org.mule.lifecycle.AbstractLifecycleManager: Disposing connector: JDBC
INFO 2014-03-12 10:00:44,195 [main] org.mule.lifecycle.AbstractLifecycleManager: Disposing model: _muleSystemModel
INFO 2014-03-12 10:00:44,379 [main] org.mule.DefaultMuleContext:
**********************************************************************
* Application "oracle_to_forms" shut down normally on: 3/12/14 *
* 10:00 AM *
* Up for: 0 days, 0 hours, 0 mins, 36.400 sec *
**********************************************************************
Exception in thread "main" org.mule.module.launcher.DeploymentStartException: SQLException: Cannot get connection for URL jdbc:oracle:thin:@//oradb:1741/ORACLEDB : IO Error: The Network Adapter could not establish the connection
at org.mule.module.launcher.application.DefaultMuleApplication.start(DefaultMuleApplication.java:170)
at org.mule.module.launcher.application.ApplicationWrapper.start(ApplicationWrapper.java:107)
at org.mule.module.launcher.DefaultMuleDeployer.deploy(DefaultMuleDeployer.java:48)
at org.mule.tooling.server.application.ApplicationDeployer.run(ApplicationDeployer.java:58)
at org.mule.tooling.server.application.ApplicationDeployer.main(ApplicationDeployer.java:91)
Caused by: org.mule.retry.RetryPolicyExhaustedException: Cannot get connection for URL jdbc:oracle:thin:@//oradb:1741/ORACLEDB : IO Error: The Network Adapter could not establish the connection (java.sql.SQLException)
at org.mule.retry.policies.AbstractPolicyTemplate.execute(AbstractPolicyTemplate.java:105)
at org.mule.transport.AbstractConnector.connect(AbstractConnector.java:1616)
at org.mule.transport.AbstractConnector.start(AbstractConnector.java:428)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.mule.lifecycle.phases.DefaultLifecyclePhase.applyLifecycle(DefaultLifecyclePhase.java:225)
at org.mule.lifecycle.RegistryLifecycleManager$RegistryLifecycleCallback.onTransition(RegistryLifecycleManager.java:276)
at org.mule.lifecycle.RegistryLifecycleManager.invokePhase(RegistryLifecycleManager.java:155)
at org.mule.lifecycle.RegistryLifecycleManager.fireLifecycle(RegistryLifecycleManager.java:126)
at org.mule.registry.AbstractRegistryBroker.fireLifecycle(AbstractRegistryBroker.java:80)
at org.mule.registry.MuleRegistryHelper.fireLifecycle(MuleRegistryHelper.java:120)
at org.mule.lifecycle.MuleContextLifecycleManager$MuleContextLifecycleCallback.onTransition(MuleContextLifecycleManager.java:94)
at org.mule.lifecycle.MuleContextLifecycleManager$MuleContextLifecycleCallback.onTransition(MuleContextLifecycleManager.java:90)
at org.mule.lifecycle.MuleContextLifecycleManager.invokePhase(MuleContextLifecycleManager.java:72)
at org.mule.lifecycle.MuleContextLifecycleManager.fireLifecycle(MuleContextLifecycleManager.java:64)
at org.mule.DefaultMuleContext.start(DefaultMuleContext.java:255)
at org.mule.module.launcher.application.DefaultMuleApplication.start(DefaultMuleApplication.java:147)
... 4 more
Caused by: org.mule.transport.ConnectException: Cannot get connection for URL jdbc:oracle:thin:@//oradb:1741/ORACLEDB : IO Error: The Network Adapter could not establish the connection (java.sql.SQLException)
at org.mule.transport.jdbc.JdbcConnector.getConnection(JdbcConnector.java:258)
at org.mule.transport.jdbc.JdbcConnector.doConnect(JdbcConnector.java:377)
at org.mule.transport.AbstractConnector$5.doWork(AbstractConnector.java:1556)
at org.mule.retry.policies.AbstractPolicyTemplate.execute(AbstractPolicyTemplate.java:67)
... 22 more
Caused by: java.sql.SQLException: Cannot get connection for URL jdbc:oracle:thin:@//oradb:1741/ORACLEDB : IO Error: The Network Adapter could not establish the connection
at org.enhydra.jdbc.standard.StandardDataSource.getConnection(StandardDataSource.java:216)
at org.enhydra.jdbc.standard.StandardDataSource.getConnection(StandardDataSource.java:144)
at org.mule.transport.jdbc.JdbcConnector.getConnection(JdbcConnector.java:254)
... 25 more
回答1:
If a connector is disconnected, its inbound endpoints are stopped. That's why what you try to do can not work.
What you need to do is to point your monitoring tool to your Mule instance's JMX tree and monitor the state of the JDBC connector, raising an alarm if it's not connected and started for more than an hour.
Alternatively, if you want Mule to self-monitor (generally speaking == not always wise), you can create a flow that fires regularly with a Quartz inbound endpoint or a poller and that will check the status of the JDBC connector directly in the registry, emailing you case of trouble.
回答2:
Try setting blocking="false" in the reconnection strategy.
回答3:
Try adding a custom default exception strategy to your mule config. As this is a connector level exception <catch-exception-strategy> of flow might not be helpful.
The following link provides more information on Custom Default Exception Strategy.
Mule Custom Default Exception Strategy
Refer to the Custom Default Exception Strategies section
Hope this helps.
来源：https://stackoverflow.com/questions/22359294/mule-catch-exception-strategy-doesnt-trigger-on-oracle-jdbc-io-error