Nessie: Strip trailing slash for warehouse location

nessie/src/main/java/org/apache/iceberg/nessie/NessieCatalog.java

@@ -41,6 +41,7 @@
 import org.apache.iceberg.relocated.com.google.common.base.Joiner;
 import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
 import org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap;
+import org.apache.iceberg.util.LocationUtil;
 import org.apache.iceberg.view.BaseMetastoreViewCatalog;
 import org.apache.iceberg.view.ViewOperations;
 import org.projectnessie.client.NessieClientBuilder;
@@ -147,15 +148,15 @@ public void initialize(
             .putAll(DEFAULT_CATALOG_OPTIONS)
             .putAll(Preconditions.checkNotNull(catalogOptions, "catalogOptions must be non-null"))
             .buildKeepingLast();
-    this.warehouseLocation = validateWarehouseLocation(name, catalogOptions);
+    this.warehouseLocation = warehouseLocation(name, catalogOptions);
     this.closeableGroup = new CloseableGroup();
     closeableGroup.addCloseable(client);
     closeableGroup.addCloseable(fileIO);
     closeableGroup.setSuppressCloseFailure(true);
   }
 
   @SuppressWarnings("checkstyle:HiddenField")
-  private String validateWarehouseLocation(String name, Map<String, String> catalogOptions) {
+  private String warehouseLocation(String name, Map<String, String> catalogOptions) {
     String warehouseLocation = catalogOptions.get(CatalogProperties.WAREHOUSE_LOCATION);
     if (warehouseLocation == null) {
       // Explicitly log a warning, otherwise the thrown exception can get list in the "silent-ish
@@ -183,7 +184,8 @@ private String validateWarehouseLocation(String name, Map<String, String> catalo
           catalogOptions);
       throw new IllegalStateException("Parameter 'warehouse' not set, Nessie can't store data.");
     }
-    return warehouseLocation;
+
+    return LocationUtil.stripTrailingSlash(warehouseLocation);
   }
 
   @Override

nessie/src/test/java/org/apache/iceberg/nessie/TestNessieCatalog.java

@@ -25,6 +25,8 @@
 import org.apache.iceberg.CatalogProperties;
 import org.apache.iceberg.catalog.CatalogTests;
 import org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap;
+import org.apache.iceberg.util.LocationUtil;
+import org.assertj.core.api.Assertions;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Disabled;
@@ -160,4 +162,15 @@ protected boolean supportsServerSideRetry() {
   public void testConcurrentCreateTransaction() {
     super.testConcurrentCreateTransaction();
   }
+
+  @Test
+  public void testWarehouseLocationWithTrailingSlash() {
+    Assertions.assertThat(catalog.defaultWarehouseLocation(TABLE))
+        .startsWith(
+            LocationUtil.stripTrailingSlash(temp.toUri().toString())
+                + "/"
+                + TABLE.namespace()
+                + "/"
+                + TABLE.name());
+  }
 }