cErrorHandler
cErrorHandler Standard properties
These properties are used to configure cErrorHandler running in the Standard Job framework.
The Standard
cErrorHandler component belongs to the Exception Handling family.
Basic settings
Default Handler |
This error handler does not support a dead letter queue and will |
 |
Set Maximum Redeliveries: select |
 |
Set Redelivery Delay: select this |
 |
Set Retry Attempted Log Level: |
 |
Asynchronized Delayed Redelivery: |
 |
More Configurations by Code: |
Dead Letter |
This handler supports attempting to redeliver the message exchange |
 |
Dead Letter Uri: select this Other parameters share the same meaning as those of the default |
Logging Handler |
This handler logs the exceptions. |
 |
Set Logger Name: select this |
 |
Set Log Level: select this check |
Usage
Usage rule |
cErrorHandler is used separately |
Limitation |
 n/a |
Logging the exception thrown during a client/server talk
This scenario applies only to Talend Open Studio for ESB, Talend Data Services Platform and Talend Data Fabric.
In this scenario, a Jetty server is started before a client browser requests access to it.
Then an exception is thrown at the server side and logged by cErrorHandler.
Dropping and linking the components
-
Drop the following components from the Palette onto the
workspace: cMessagingEndpoint, cErrorHandler and cProcessor, labelled as Jetty_Server, Error_Handler
and Throw_Exception respectively. -
Link cMessagingEndpoint and cProcessor using a Row >
Route connection.
Configuring the components
-
Double-click cErrorHandler to open its Basic settings view in the Component tab.
-
Select Logging Handler to log the exceptions that are
thrown. -
Double-click cMessagingEndpoint to open its Basic settings view in the Component tab.
-
In the Uri field, enter
jetty:http://localhost:8889/service
to specify the Jetty
server. -
Click Advanced settings for
further setup. -
In the Dependencies table, click the [+] button to add a line and select
jetty
from the Camel
component list. -
Double-click cProcessor to
open its Basic settings view in the
Component tab. -
In the Code box, enter
throw new Exception("server
to throw an exception.
side error") - Press Ctrl+S to save your Route.
Viewing code and executing the Route
-
Click the Code tab at the bottom of the design workspace
to check the generated code.As shown above, the route startsfrom
the endpointJetty_Server
and throws the exception ofserver side error
via
cProcessor_1
. -
Press F6 to execute the Route.
The Jetty server has started.
-
Launch an Internet browser and enter
http://localhost:8889/service
(the Jetty server URI
configured above) in the address bar to access the server.As shown above, the request failed due to the server error. -
Go to the Studio and check the results in the Run
tab.As shown above, cErrorHandler has logged the exception
at the level of ERROR.