Minor fix

Author: emmyzhou-db

databricks-sdk-java/src/main/java/com/databricks/sdk/core/DefaultCredentialsProvider.java

@@ -15,10 +15,10 @@
 public class DefaultCredentialsProvider implements CredentialsProvider {
   private static final Logger LOG = LoggerFactory.getLogger(DefaultCredentialsProvider.class);
 
-  // List of credential providers that will be tried in sequence
-  private List<CredentialsProvider> providers = new ArrayList<>();
+  /* List of credential providers that will be tried in sequence */
+  private List<CredentialsProvider> providers;
 
-  // The currently selected authentication type
+  /* The currently selected authentication type */
   private String authType = "default";
 
   /**
@@ -143,6 +143,7 @@ private void addOIDCCredentialsProviders(DatabricksConfig config) {
    * @param config The Databricks configuration to use for provider initialization
    */
   private void addDefaultCredentialsProviders(DatabricksConfig config) {
+    providers = new ArrayList<>();
     providers.add(new PatCredentialsProvider());
     providers.add(new BasicCredentialsProvider());
     providers.add(new OAuthM2MServicePrincipalCredentialsProvider());

databricks-sdk-java/src/main/java/com/databricks/sdk/core/oauth/GithubIDTokenSource.java

@@ -15,14 +15,14 @@
  * Actions environment.
  */
 public class GithubIDTokenSource implements IDTokenSource {
-  // URL endpoint for requesting ID tokens from GitHub Actions
+  /* URL endpoint for requesting ID tokens from GitHub Actions */
   private final String actionsIDTokenRequestURL;
-  // Authentication token required to request ID tokens from GitHub Actions
+  /* Authentication token required to request ID tokens from GitHub Actions */
   private final String actionsIDTokenRequestToken;
-  // HTTP client for making requests to GitHub Actions
+  /* HTTP client for making requests to GitHub Actions */
   private final HttpClient httpClient;
-  // JSON mapper for parsing response data
-  private final ObjectMapper mapper = new ObjectMapper();
+  /* JSON mapper for parsing response data */
+  private static final ObjectMapper mapper = new ObjectMapper();
 
   /**
    * Constructs a new GithubIDTokenSource.
@@ -100,11 +100,11 @@ public IDToken getIDToken(String audience) {
       throw new DatabricksException("ID token response missing 'value' field");
     }
 
-    String tokenValue = jsonResp.get("value").textValue();
-    if (Strings.isNullOrEmpty(tokenValue)) {
+    try {
+      String tokenValue = jsonResp.get("value").textValue();
+      return new IDToken(tokenValue);
+    } catch (IllegalArgumentException e) {
       throw new DatabricksException("Received empty ID token from GitHub Actions");
     }
-
-    return new IDToken(tokenValue);
   }
 }