Assistance Required: Compilation and Deployment Issues in carddemo-service

Question

I encountered some challenges while working on the carddemo-service project. Here's a summary of the problem, the attempted solutions, and the current status:
Initial Issue

During compilation, the following method caused an error:

@Bean
public TransactionManager transactionManager() {
    return new UserTransactionManager();
}

@Bean
public PlatformTransactionManager platformTransactionManager(DataSource primaryDataSource) {
    return new JtaTransactionManager(transactionManager());
}

To resolve this, I updated the code as follows:

/**
 * The transaction manager setup to handle ExecSQL statements.
 * 
 * @return the platform transaction manager
 */
@Bean
public PlatformTransactionManager platformTransactionManager(DataSource primaryDataSource) {
    return new DataSourceTransactionManager(primaryDataSource);
}

This resolved the compilation error.
Deployment Issue

While deploying the application, I encountered the following runtime error:

java.lang.NoClassDefFoundError: javax/servlet/Filter
    at ...
Caused by: java.lang.ClassNotFoundException: javax.servlet.Filter
    at ...

Steps Taken

Added the following dependency to address the javax.servlet.Filter class issue:

javax.servlet
        javax.servlet-api
        4.0.1
        provided

Cleaned and rebuilt the project using mvn clean install.

Despite these changes, the deployment issue persists.

re:Post Agent · Answer

It seems you're facing multiple issues with the carddemo-service project. Let's address them one by one:

1. Compilation Issue:
Your solution to replace the JtaTransactionManager with DataSourceTransactionManager is a good approach. This change should resolve the compilation error related to the transaction manager.

2. Deployment Issue:
The runtime error you're encountering (java.lang.NoClassDefFoundError: javax/servlet/Filter) suggests that the servlet API is not available in the runtime classpath. While adding the javax.servlet-api dependency is a step in the right direction, the 'provided' scope might be causing issues if your runtime environment doesn't provide these classes.

To resolve this, try changing the scope of the servlet API dependency from 'provided' to 'compile':

```xml

javax.servlet
    javax.servlet-api
    4.0.1
    compile

```

If the issue persists, it could be related to how the application is packaged or deployed. Ensure that all necessary dependencies are included in your application's WAR or JAR file.

3. Additional Considerations:
- Check if you're using the correct Java version that's compatible with your dependencies and runtime environment.
- Verify that your application server or container (e.g., Tomcat, Jetty) is properly configured and has the necessary libraries.
- Review your deployment process to ensure all required files and configurations are included.

If the problem continues after these steps, you might need to investigate further by examining the full stack trace and server logs for any additional error messages or warnings that could provide more context about the deployment failure.  
**Sources**  
[Wokshop Demo /carddemo-service startup failed due to ValidationFilter | AWS re:Post](https://repost.aws/questions/QUvpYhij2hRSOVE9T_MeH1Eg/wokshop-demo-carddemo-service-startup-failed-due-to-validationfilter)

Assistance Required: Compilation and Deployment Issues in carddemo-service

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