Resolving the Connection Refused Error in Spring Boot and ElasticSearch Integration
Learn how to resolve the common `Connection refused` error when integrating Spring Boot with ElasticSearch within a Docker environment.
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This video is based on the question https://stackoverflow.com/q/76802506/ asked by the user 'Sonnka' ( https://stackoverflow.com/u/21964694/ ) and on the answer https://stackoverflow.com/a/76806017/ provided by the user 'Vadim Yemelyanov' ( https://stackoverflow.com/u/10403784/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.
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Resolving the Connection Refused Error in Spring Boot and ElasticSearch Integration
When developing a Spring Boot application that connects to ElasticSearch, encountering connection issues can be frustrating. One common error is the Connection refused exception, which typically occurs when your Spring Boot application cannot establish a connection to the ElasticSearch server running in Docker. In this post, we will walk through the problem and provide a detailed solution to get your application up and running correctly.
Understanding the Problem
When you try to run your Spring Boot application and connect to ElasticSearch, you might come across the following error:
[[See Video to Reveal this Text or Code Snippet]]
This error indicates that the application cannot connect to the intended ElasticSearch service. There are several reasons why this error might occur, primarily related to Docker configurations and ElasticSearch setup.
Diagnosing the Issue
To effectively troubleshoot the connectivity problem between your Spring Boot application and ElasticSearch, follow these steps:
1. Check ElasticSearch Configuration
Verify that your docker-compose.yml file is set up correctly. It's important to ensure that the ElasticSearch service is running on the expected port (usually 9200). Here's a snippet demonstrating how to configure the service correctly:
[[See Video to Reveal this Text or Code Snippet]]
In this configuration:
xpack.security.enabled=false disables security features that would normally enforce HTTPS connection requirements and credentials.
2. Review Application Properties
Next, check the application.properties file in your Spring Boot project. Ensure it correctly points to the ElasticSearch instance. If your instance runs in Docker, it should refer to the appropriate connection parameters. Here’s an example of what your properties file might look like:
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Note the URL uses HTTP instead of HTTPS, matching our Docker settings.
3. Ensure Docker Container Dependencies
In your docker-compose.yml, make sure that your Spring Boot application container depends on the ElasticSearch container correctly, ensuring it waits for ElasticSearch to become available. Your Spring Boot service configuration might look like this:
[[See Video to Reveal this Text or Code Snippet]]
This ensures that the ElasticSearch service is started before the Spring Boot application is initiated.
The Solution
Here’s how you can set up your Docker and Spring Boot application properly to avoid Connection refused issues:
Modify the Docker Configuration
If you haven't done so yet, ensure your docker-compose.yml is set to disable Elasticsearch security features by including the following line:
[[See Video to Reveal this Text or Code Snippet]]
Eliminate Unnecessary Configuration
It's important to note that if your application.properties file already includes the required configuration, you don’t necessarily need a separate ElasticSearchConfig class. Spring Boot will automatically pick up the settings from the properties file and connect to ElasticSearch as configured.
Complete Example of Docker Compose and Settings
Here’s a full outline of how your docker-compose.yml file should look for your ElasticSearch service:
[[See Video to Reveal this Text or Code Snippet]]
And confirm your Spring Boot's application.properties is set to use http:
[[See Video to Reveal this Text or Code Snippet]]
Conclusion
By ensuring the proper configuration of your ElasticSearch instance and your Spring Boot application, you can eliminate the Connection refused errors that arise during developm
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