[jira] [Commented] (OLINGO-50) Exceptions are not throw

["Stephan Klevenz (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OLINGO-50?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13808882#comment-13808882 ] 

Stephan Klevenz commented on OLINGO-50:
---------------------------------------

For error cases OData does define this error response which is not sufficient for development use cases.

Olingo hasn't implemented any log and trace functionality and that is just because of Olingo doesn't want a dependency to a specific L&T api. 

However, Olingo supports the developer use case in a different way and we just miss the documentation for it.

Here is a short explantaion:

private final class ScenarioDebugCallback implements ODataDebugCallback {
  @Override
  public boolean isDebugEnabled() {
    return true;
  }
}

In your service factory (ODataServiceFactory) implement the following method:

public <T extends ODataCallback> T getCallback(final Class<? extends ODataCallback> callbackInterface) {
  return (T) (callbackInterface.isAssignableFrom(ScenarioErrorCallback.class) ? new ScenarioErrorCallback() : callbackInterface.isAssignableFrom(ODataDebugCallback.class) ? new ScenarioDebugCallback() : super.getCallback(callbackInterface));
} 

If this is in place then add odata-debug=json as additional query parameter to the URL in the browser. Now the server will return an extensive json object conteining detailed error information.


> Exceptions are not throw
> ------------------------
>
>                 Key: OLINGO-50
>                 URL: https://issues.apache.org/jira/browse/OLINGO-50
>             Project: Olingo
>          Issue Type: Bug
>    Affects Versions: 1.0.0
>            Reporter: Thiago Assis
>
> I cant see the stack trace of the generated exception, is not generated in te application server log and the browser returns 
> <?xml version='1.0' encoding='UTF-8'?><error xmlns="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata"><code/><message xml:lang="en-US">An exception occurred.</message></error>
> This happen when i request the URL: http://localhost:8888/odata/



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