Dealing with ResourceNotFoundException in AWS CloudWatch Evidently
Introduction: Welcome to another exciting technical article where we dive into the powerful capabilities of AWS CloudWatch Evidently. In this article, we will specifically explore a common exception called ResourceNotFoundException and learn how to deal with it effectively. Buckle up and let’s get started!
Understanding ResourceNotFoundException
When working with AWS CloudWatch Evidently, there might be times when you encounter the ResourceNotFoundException. This exception is thrown when you try to access or perform an operation on a resource that does not exist within AWS CloudWatch Evidently.
Resources in this context can include log groups, log streams, metric filters, or even entire CloudWatch Evidently environments.
Identifying the Cause
Before we delve into specific code examples of handling ResourceNotFoundException, it’s crucial to understand the common scenarios that can lead to this exception:
Nonexistent Resource: Attempting to access a resource that has been deleted or doesn’t exist in the first place.
Incorrect ARN or Identifier: Providing an incorrect Amazon Resource Name (ARN) or identifier while working with various CloudWatch Evidently APIs.
Missing Permissions: Lack of necessary permissions to perform the requested operation on a resource.
With this understanding, let’s explore how to handle this exception gracefully.
Error Handling Best Practices
To handle the ResourceNotFoundException effectively, follow these best practices:
Check the existence of a resource before performing operations on it
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try {
GetLogGroupRequest logGroupRequest = new GetLogGroupRequest()
.withLogGroupName("my-log-group");
GetLogGroupResult logGroupResult = cloudWatchEvidentlyClient.getLogGroup(logGroupRequest);
// Perform operations on the logGroupResult...
} catch (ResourceNotFoundException e) {
// Handle the exception - Log group doesn't exist.
}
Gracefully handle not found scenarios when retrieving AWS resources
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try {
// Retrieves a specific CloudWatch Evidently resource
GetLogStreamRequest logStreamRequest = new GetLogStreamRequest()
.withLogGroupName("my-log-group")
.withLogStreamName("my-log-stream");
GetLogStreamResult logStreamResult = cloudWatchEvidentlyClient.getLogStream(logStreamRequest);
// Perform operations on the logStreamResult...
} catch (ResourceNotFoundException e) {
// Handle the exception - Log stream doesn't exist.
}
Provide clear error messages and user feedback
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catch (ResourceNotFoundException e) {
// Handle the exception - Log group doesn't exist.
System.out.println("Oops! The requested log group was not found. Please provide a valid log group name.");
}
Verify permissions before attempting operations on resources
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try {
// Delete a specific metric filter
DeleteMetricFilterRequest metricFilterRequest = new DeleteMetricFilterRequest()
.withLogGroupName("my-log-group")
.withFilterName("my-metric-filter");
cloudWatchEvidentlyClient.deleteMetricFilter(metricFilterRequest);
// Successful deletion...
} catch (ResourceNotFoundException e) {
// Handle the exception - Metric filter doesn't exist.
} catch (AmazonServiceException e) {
// Handle insufficient permissions.
}
Conclusion
In this 15-minute read, we took a deep dive into the ResourceNotFoundException exception encountered when working with AWS CloudWatch Evidently. By diligently following the best practices outlined above, you can gracefully handle this exception and ensure a smooth experience when interacting with CloudWatch Evidently resources.
Remember to always check the existence of resources, provide informative error messages, and verify the necessary permissions. Doing so will save you valuable development time and enhance your application’s reliability.
So, continue exploring the powerful features of AWS CloudWatch Evidently and take your monitoring and logging capabilities to new heights!
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