Java code to fetch data from bigtable giving error creating bean with name datasourcescriptdatabase

[siju2u]

Hi @,

We are working on a java spring boot rest api to fetch data from bigtable. We followed below link

https://cloud.google.com/bigtable/docs/reference/libraries#client-libraries-install-java

But it giving us the error "Unsatisfied dependency expressed through method dataSourceScriptDatabaseInitializer".

As per documentation it is asked to add only below line in the pom.xml file

 <dependency>
    <groupId>com.google.cloud</groupId>
    <artifactId>google-cloud-bigtable</artifactId>
  </dependency>

Anything else we need to add? How we can resolve the issue?

[ms4446]

The error "Unsatisfied dependency expressed through method dataSourceScriptDatabaseInitializer" typically indicates a configuration issue in Spring Boot, particularly related to data source initialization. However, since Google Cloud Bigtable is a NoSQL service and does not use JDBC, this error suggests a potential misconfiguration in your Spring Boot setup, rather than a problem with the Bigtable integration itself.

To resolve this issue in the context of a Spring Boot application using Google Cloud Bigtable, consider the following steps:

1. Review Spring Boot Configuration: Ensure that your application is not attempting to auto-configure a data source for a relational database. Since Bigtable does not use JDBC, any auto-configuration for JDBC might cause conflicts. You can exclude DataSourceAutoConfiguration in your Spring Boot application to prevent it from configuring a data source that you don't need.

2. Bigtable Specific Configuration: Verify that your Bigtable configuration is correct. This includes setting up the Bigtable instance ID, table ID, and credentials properly in your application.

3. Check Dependencies: The google-cloud-bigtable dependency is typically sufficient for integrating Bigtable. However, make sure that other dependencies, especially Spring Boot starters, are compatible and correctly configured. There should be no dependencies related to JDBC or RDBMS if you're not using any relational database.

4. Debugging the Application: Debug your application's startup process to identify why Spring Boot is attempting to initialize a data source bean. This can provide insights into any misconfiguration or conflicts in your application context.

5. Consult Documentation: Refer to both Spring Boot and Google Cloud Bigtable documentation for guidance. They might offer specific instructions or examples for integrating Bigtable with a Spring Boot application.

6. Spring Boot Version Compatibility: Ensure that the version of Spring Boot you are using is compatible with the Google Cloud Bigtable client library.

[siju2u]

Hi @ms4446 ,

Soory to ask stupid question. I am very new to java sprint boot and Google bigtable.

1) How to check the version of Sprint Boot?

2) Ho we can check the stratup process of Sprint Boot (This is to check where initialize is happening for a data source bean)

[ms4446]

1. Checking Spring Boot Version:

   • Using the Spring Boot CLI: Run spring --version in your terminal. This will show the version of the Spring Boot CLI, but note that this may not always match the version used in your specific project.
   • Using Maven: Open the pom.xml file and look for the spring-boot-starter-parent dependency. The version of Spring Boot is listed in the version attribute of this dependency. Alternatively, check the spring-boot-dependencies section if your project uses a different parent.
   • Using Gradle: In your build.gradle file, the Spring Boot version might be specified in the ext block or directly in the dependencies section as part of the spring-boot-starter-* dependency.
   • Using IDE: Open your Spring Boot project in your IDE. The IDE typically displays the Spring Boot version in the project's dependency management section.
   • Checking the Spring Boot Banner: When you run your Spring Boot application, the banner displayed on startup usually shows the version. However, this banner can be customized or disabled, so it might not always be present.

2. Checking Spring Boot Startup Process:

   • Using Debug Mode: Run your Spring Boot application with the --debug flag or set debug=true in your application.properties. This provides detailed logs of the initialization process, including bean creation and dependency injection.
   • Using Logging: Enable debug logging for relevant Spring Boot components, such as org.springframework.boot.autoconfigure. This can be done in your logging configuration file. Analyze the logs to understand the creation and initialization of the data source bean.
   • Using @EventListener Annotation: Add an event listener in your code annotated with @EventListener(ApplicationReadyEvent.class). Use this listener to log details about the data source bean and its configuration.
   • Using Spring Boot Actuator: Include the spring-boot-starter-actuator dependency in your project. Access the /beans endpoint to view a list of all Spring beans and their dependencies, which can help identify the data source bean and its configuration.
   • Using Debugger in IDE: Set breakpoints in your code at suspected points of data source bean initialization. Use the debugger to step through the code and examine the bean creation and initialization process.

[siju2u]

Ok. Thanks for the prompt reply.

One more question. Which Sprint boot version is compatable for BigTable? 

[ms4446 · Accepted solution]

The compatibility of Spring Boot with Bigtable depends on the specific client library or framework you are using to interface with Bigtable. Here's a general guideline for popular options:

1. Bigtable Client Libraries:

   • Bigtable HBase Client: Typically compatible with recent Spring Boot versions (e.g., 2.2.x and higher), but check the latest documentation for precise details.
   • Bigtable Java Client: Often compatible with newer Spring Boot versions (e.g., 2.4.x and higher), but verify against current documentation for exact version compatibility.

2. Spring Data Bigtable:

   • Spring Data Bigtable: This integration is usually compatible with specific Spring Boot versions (e.g., 2.5.x and higher), but again, refer to the latest documentation for accurate compatibility information.

Therefore, the minimum Spring Boot version required for Bigtable compatibility can vary based on the chosen library or framework:

• For Bigtable HBase Client: Possibly 2.2.x or higher.
• For Bigtable Java Client: Potentially 2.4.x or higher.
• For Spring Data Bigtable: Likely 2.5.x or higher.

However, for the best compatibility and access to the latest features, it is generally recommended to use the latest versions of Spring Boot alongside the latest Bigtable client libraries. It's crucial to consult the official documentation of your chosen library or client for the most precise and up-to-date compatibility information and update guidelines. This approach ensures that you are working with the most current compatibility matrix and taking advantage of the latest improvements and features.