java.lang.IllegalArgumentException: retries must be greater than 0

This error suggests that there is a configuration issue in your Spring Cloud Gateway setup, specifically with the retry logic for one of the routes. The retries value, which is part of the route configuration, is either not set or is set to zero, and it must be a positive number.

Here’s how you can address the issue:

1. Check the Route Configuration

The error likely comes from a route definition where the retry configuration is not set correctly. Review the route definitions in your application.yml or application.properties to ensure the retry configuration is valid.

In Spring Cloud Gateway, you can define retries for a route like this:

spring: cloud: gateway: routes: - id: example_route uri: http://example.com predicates: - Path=/somepath/** filters: - name: Retry args: retries: 3 # Must be greater than 0

Make sure the retries argument is greater than 0.

2. Verify Retry Filter Configuration

If you're using the Retry filter in your route configuration, ensure that the retries value is specified and greater than 0. For example:

spring: cloud: gateway: routes: - id: some_route uri: http://example.com filters: - name: Retry args: retries: 3 statuses: 500,502 # Retry on specific HTTP status codes methods: GET, POST # Retry on specific HTTP methods

Important: The retries field must be an integer greater than 0.

3. Check for Empty or Missing Retry Arguments

Sometimes, missing configuration or empty retry arguments in a route definition can cause this error. Double-check that you haven't defined the Retry filter without the necessary arguments.

4. Review Spring Cloud Gateway Version

The issue might be related to the version of Spring Cloud Gateway you are using. Make sure that the version is compatible with other Spring components. If you're using an older version, consider upgrading to a more recent release of Spring Cloud Gateway.

For example, in your pom.xml or build.gradle, ensure you're using a compatible version of spring-cloud-starter-gateway.

<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-gateway</artifactId> <version>3.x.x</version> <!-- Ensure this is the correct version --> </dependency>

5. Look at the Stack Trace

Sometimes the error message is propagated from a specific route definition or filter. Check the full stack trace for additional clues as to where the error originates.

6. Example Retry Configuration

Here's an example of a route configuration with retry enabled:

spring: cloud: gateway: routes: - id: retry_route uri: http://example.com predicates: - Path=/retry/** filters: - name: Retry args: retries: 3 # Must be > 0 statuses: 500,502 # Retry for 500 and 502 HTTP statuses methods: GET, POST # Retry on GET and POST requests

In this configuration, the route retry_route will retry 3 times for HTTP status 500 or 502, and only for GET and POST methods.