fix: empty cursor / offset

Author: TeddyCr

openmetadata-service/src/main/java/org/openmetadata/service/jdbi3/EntityRepository.java

@@ -1005,7 +1005,7 @@ public ResultList<T> listAfter(
     if (limitParam > 0) {
       // forward scrolling, if after == null then first page is being asked
       Map<String, String> cursorMap =
-          parseCursorMap(after == null ? "" : RestUtil.decodeCursor(after));
+          parseCursorMap(after == null || after.isEmpty() ? "" : RestUtil.decodeCursor(after));
       String afterName = FullyQualifiedName.unquoteName(cursorMap.get("name"));
       String afterId = cursorMap.get("id");
       List<String> jsons = dao.listAfter(filter, limitParam + 1, afterName, afterId);
@@ -1019,7 +1019,7 @@ public ResultList<T> listAfter(
 
       String beforeCursor;
       String afterCursor = null;
-      beforeCursor = after == null ? null : getCursorValue(entities.get(0));
+      beforeCursor = after == null || after.isEmpty() ? null : getCursorValue(entities.get(0));
       if (entities.size()
           > limitParam) { // If extra result exists, then next page exists - return after cursor
         entities.remove(limitParam);

openmetadata-service/src/main/java/org/openmetadata/service/jdbi3/WebAnalyticEventRepository.java

@@ -169,7 +169,8 @@ private String getBeforeOffset(int offsetInt, int limit) {
   }
 
   private int getOffset(String offset) {
-    return offset != null ? Integer.parseInt(RestUtil.decodeCursor(offset)) : 0;
+    String decoded = RestUtil.decodeCursor(offset);
+    return offset != null && decoded != null ? Integer.parseInt(decoded) : 0;
   }
 
   private Map<String, List<?>> getEntityList(List<String> jsons, boolean skipErrors) {

openmetadata-service/src/main/java/org/openmetadata/service/util/RestUtil.java

@@ -117,7 +117,9 @@ public static String encodeCursor(String cursor) {
   }
 
   public static String decodeCursor(String cursor) {
-    return cursor == null ? null : new String(Base64.getUrlDecoder().decode(cursor));
+    return cursor == null || cursor.isEmpty()
+        ? null
+        : new String(Base64.getUrlDecoder().decode(cursor));
   }
 
   public static class PutResponse<T> {

openmetadata-service/src/main/java/org/openmetadata/service/util/jdbi/JdbiUtils.java

@@ -55,7 +55,8 @@ public static Jdbi createAndSetupJDBI(DataSourceFactory dbFactory) {
   }
 
   public static int getOffset(String offset) {
-    return offset != null ? Integer.parseInt(RestUtil.decodeCursor(offset)) : 0;
+    String decoded = RestUtil.decodeCursor(offset);
+    return offset != null && decoded != null ? Integer.parseInt(decoded) : 0;
   }
 
   public static String getAfterOffset(int offsetInt, int limit, int total) {