The AEM (Adobe Experience Manager) Analyzer Maven Plugin is a crucial tool for ensuring code quality and adherence to best practices within AEM projects. However, developers sometimes encounter seemingly cryptic errors during the build process. This article explores a specific error related to package imports and exports, offering insights and potential solutions.
One perplexing error message that can arise during an AEM Maven build when using the aemanalyser-maven-pluginis:
[api-regions-exportsimports] importing package(s) com.mywebsite.core.models.test in start level 21 but no bundle is exporting these for that start level.
This error essentially indicates a discrepancy between what your bundle is trying to import (a package) and what other bundles in the AEM environment are exporting. In simpler terms, your code needs something that isn't being shared properly.
importing package(s) com.mywebsite.core.models.test: This tells you the specific package your bundle is trying to use. In this case, it's com.mywebsite.core.models.test.in start level 21: OSGi bundles have start levels that determine the order in which they are activated. This part of the message indicates the start level at which the import is attempted. Start levels are often used to manage dependencies between bundles.but no bundle is exporting these for that start level: This is the core of the problem. No other active bundle in your AEM instance is declaring that it makes the com.mywebsite.core.models.test package available for use by other bundles at start level 21.Bundle Inclusion in the "All" Package: The first thing to check is whether the affected bundle is correctly included in the "all" package. The "all" package serves as a container, ensuring that all necessary components for your AEM application are deployed together. To verify this, check your "all" module's pom.xml file and ensure the module containing your bundle is listed.
Archetype and Plugin Versions: Outdated versions of the AEM archetype or the aem-analyser-plugin can cause unexpected issues. Ensure you are using the latest versions. Check your project's pom.xml files for the plugin and archetype versions and update them if necessary.
Missing Bundle Deployment: The most likely reason is that the bundle containing the com.mywebsite.core.models.test package is not actually deployed to your AEM instance. Here is how to address this:
crx-quickstart/install directory of your AEM instance (or deployed via the Felix Web Console).Incorrect Package Export Configuration: Even if the bundle is deployed, it might not be configured to export the com.mywebsite.core.models.test package.
pom.xml of the bundle that should be exporting the package.maven-bundle-plugin configuration.<Export-Package> instruction includes com.mywebsite.core.models.test. It might look something like this:<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<extensions>true</extensions>
<configuration>
<instructions>
<Export-Package>
com.mywebsite.core.models.*;version=${project.version},
com.mywebsite.core.services.*;version=${project.version}
</Export-Package>
<Import-Package>
*,
javax.servlet.*;version="[2.6,4.0)"
</Import-Package>
</instructions>
</configuration>
</plugin>
Import-Package section defines the external dependencies that a bundle needs. The Export-Package section defines which packages a bundle exposes for use by other bundles.bnd.bnd file, similar export configurations are neededpom.xml file or bnd.bnd redeploy your bundle to the AEM instance.Internal Class Visibility: The original poster mentioned an internal class: "this is an internal class, just a simple model interface, with the implementation in > internal/model/myClassImpl." This is an important clue.
com.mywebsite.core.models.test is only intended for internal use within the bundle, it should not be exported.com.mywebsite.core.models.test. If it should not be using this internal package, the import statement must be removed.Start Level Conflicts: While less common, a mismatch in start levels can prevent the package from being available when your bundle initializes. Verify that there are no unintended start level configurations affecting the bundle that exports the package.
In some cases, the error arises when relying on third-party libraries. If your code depends on external JAR files, these need to be properly embedded within your AEM project. Nitesh Kumar's reply in the original forum thread includes useful links for addressing this scenario:
pom.xml file<Embed-Dependency> instruction.When importing packages, be as specific as possible with the version ranges. For example:
<Import-Package>
org.osgi.framework;version="[1.9,2.0)",
*;resolution:=optional
</Import-Package>
This declares a dependency on org.osgi.framework with a specific version range. The resolution:=optional indicates that the bundle can still start even if the dependency isn't immediately available.
Troubleshooting aemanalyser-maven-plugin errors can sometimes require a methodical approach. By carefully examining the error messages, bundle configurations, and dependency management, you can identify and resolve these issues, ensuring a smooth and reliable AEM development workflow. Addressing these plugin errors early in the development cycle is crucial for maintaining a healthy and stable AEM environment.
