WW-5593 Handle NoClassDefFoundError in convention plugin action class scanning

[lukaszlenart]

Summary

Fixes WW-5593

• Add NoClassDefFoundError to the catch block in PackageBasedActionConfigBuilder.getActionClassTest()
• Improve error message to help users understand missing dependency issues
• Add unit tests for both NoClassDefFoundError and ClassNotFoundException handling

Problem

The convention plugin's PackageBasedActionConfigBuilder only caught ClassNotFoundException but not NoClassDefFoundError when scanning for action classes. This caused complete application startup failure when:

• struts.convention.action.includeJars is configured
• Scanned JARs contain classes with missing optional dependencies (e.g., test classes depending on JUnit)

Solution

Use multi-catch to handle both exception types:

} catch (ClassNotFoundException | NoClassDefFoundError ex) {
    LOG.error("Unable to load class [{}]. Perhaps it exists but certain dependencies are not available?",
            classInfo.getName(), ex);
    return false;
}

Test plan

• New unit test testNoClassDefFoundErrorHandling() verifies NoClassDefFoundError is caught
• New unit test testClassNotFoundExceptionHandling() verifies existing behavior preserved
• All 8 tests in PackageBasedActionConfigBuilderTest pass

🤖 Generated with Claude Code

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud