SOLR-17066 Fix ShardSplitTest & StressHdfsTest

solr/core/src/test/org/apache/solr/cloud/api/collections/ShardSplitTest.java

@@ -1277,9 +1277,7 @@ protected void splitShard(
     QueryRequest request = new QueryRequest(params);
     request.setPath("/admin/collections");
 
-    String baseUrl =
-        ((HttpSolrClient) shardToJetty.get(SHARD1).get(0).client.getSolrClient()).getBaseURL();
-    baseUrl = baseUrl.substring(0, baseUrl.length() - "collection1".length());
+    String baseUrl = shardToJetty.get(SHARD1).get(0).jetty.getBaseUrl().toString();
 
     try (SolrClient baseServer =
         new HttpSolrClient.Builder(baseUrl)

solr/modules/hdfs/src/test/org/apache/solr/hdfs/cloud/StressHdfsTest.java

@@ -251,4 +251,8 @@ private void createAndDeleteCollection() throws Exception {
       }
     }
   }
+
+  protected String getBaseUrl(SolrClient client) {
+    return ((HttpSolrClient) client).getBaseURL();
+  }
 }

solr/solrj/src/java/org/apache/solr/client/solrj/impl/HttpSolrClient.java

@@ -801,6 +801,7 @@ public ModifiableSolrParams getInvariantParams() {
     return invariantParams;
   }
 
+  /** Typically looks like {@code http://localhost:8983/solr} (no core or collection) */
   public String getBaseURL() {
     return baseUrl;
   }

solr/test-framework/src/java/org/apache/solr/cloud/AbstractBasicDistributedZkTestBase.java

@@ -1115,16 +1115,6 @@ public static void createCollectionInOneInstance(
     }
   }
 
-  protected String getBaseUrl(SolrClient client) {
-    String url2 =
-        ((HttpSolrClient) client)
-            .getBaseURL()
-            .substring(
-                0,
-                ((HttpSolrClient) client).getBaseURL().length() - DEFAULT_COLLECTION.length() - 1);
-    return url2;
-  }
-
   @Override
   protected CollectionAdminResponse createCollection(
       Map<String, List<Integer>> collectionInfos,

solr/test-framework/src/java/org/apache/solr/cloud/AbstractFullDistribZkTestBase.java

@@ -159,7 +159,10 @@ public static class CloudJettyRunner {
     public JettySolrRunner jetty;
     public String nodeName;
     public String coreNodeName;
+
+    /** Core or Collection URL */
     public String url;
+
     public CloudSolrServerClient client;
     public ZkNodeProps info;
 

solr/test-framework/src/java/org/apache/solr/embedded/JettySolrRunner.java

@@ -834,10 +834,7 @@ public void setProxyPort(int proxyPort) {
     this.proxyPort = proxyPort;
   }
 
-  /**
-   * Returns a base URL consisting of the protocol, host, and port for a Connector in use by the
-   * Jetty Server contained in this runner.
-   */
+  /** Returns a base URL like {@code http://localhost:8983/solr} */
   public URL getBaseUrl() {
     try {
       return new URL(protocol, host, jettyPort, "/solr");