LNK-3334: Error occurred while evaluating measure: Cannot invoke "jav…

…a.net.URL.openConnection()" because "url" is null (#607)

### 🛠️ Description of Changes

Use the main thread's context class loader (rather than the system class
loader) to resolve logback-cli.xml from the classpath. Otherwise
resolution fails in a Spring Boot `repackage`d fat JAR, because the
system class loader doesn't support reaching into nested JARs to find
resources.

### 🧪 Testing Performed

Ran an arbitrary evaluation via `java -jar`. Successfully reproduced the
error before the fix; verified that the error was resolved after the
fix.

### 📓 Documentation Updated

N/A

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Bug Fixes**
	- Improved logging configuration error handling
- Enhanced logging resilience by preventing application failure due to
missing configuration files
	- Implemented more robust exception management during logging setup

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Java/measureeval/src/main/java/com/lantanagroup/link/measureeval/FileSystemInvocation.java

@@ -16,6 +16,7 @@
 
 import java.io.File;
 import java.io.IOException;
+import java.net.URL;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
@@ -33,13 +34,23 @@ public class FileSystemInvocation {
     private static final FhirContext fhirContext = FhirContext.forR4Cached();
     private static final Logger logger = LoggerFactory.getLogger(FileSystemInvocation.class);
 
-    private static void configureLogging(Bundle bundle) throws JoranException {
-        LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();
-        context.reset();
-        JoranConfigurator configurator = new JoranConfigurator();
-        configurator.setContext(context);
-        configurator.doConfigure(ClassLoader.getSystemResource("logback-cli.xml"));
-        CqlLogAppender.start(context, libraryId -> CqlUtils.getLibrary(bundle, libraryId));
+    private static void configureLogging(Bundle bundle) {
+        try {
+            LoggerContext context = (LoggerContext) LoggerFactory.getILoggerFactory();
+            context.reset();
+            JoranConfigurator configurator = new JoranConfigurator();
+            configurator.setContext(context);
+            ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
+            URL resource = classLoader.getResource("logback-cli.xml");
+            if (resource == null) {
+                logger.warn("logback-cli.xml not found in classpath");
+                return;
+            }
+            configurator.doConfigure(resource);
+            CqlLogAppender.start(context, libraryId -> CqlUtils.getLibrary(bundle, libraryId));
+        } catch (Exception e) {
+            logger.warn("Failed to configure logging", e);
+        }
     }
 
     private static Bundle getBundle(String measureBundlePath) throws IOException {