Consider defining a bean of type 'java.lang.String' in your configuration.

This error message usually occurs when Spring is unable to find a bean of type `java.lang.String` in your configuration. Here are a few things you can check to resolve the issue:

1. Make sure you have defined a bean of type `java.lang.String` in your configuration. You can do this using the `@Bean` annotation or by defining it in an XML configuration file.

2. Check the package and import statements of your configuration file to ensure that the `java.lang.String` class is being imported correctly.

3. If you are using component scanning to automatically detect beans, make sure that the package containing the `java.lang.String` bean is included in the scan.

4. If you are using auto-configuration, make sure that the `java.lang.String` bean is being created by the auto-configuration process.

5. If none of the above steps work, try cleaning and rebuilding your project to ensure that all dependencies are up to date and that there are no build errors.