fix(clickhouse-client): load services from client module

CHANGELOG.md

@@ -35,6 +35,11 @@
 
 ### Bug Fixes 
 
+- **[clickhouse-client]** Fixed JPMS/module-path service loading for `ClickHouseRequestManager` by loading client
+  services from the `com.clickhouse.client` module, which declares the required `uses` directives. This avoids
+  `ServiceConfigurationError` failures from `com.clickhouse.data` when applications run on the module path.
+  (https://github.com/ClickHouse/clickhouse-java/issues/2669)
+
 - **[client-v2, jdbc-v2]** Reduced noisy and potentially sensitive logging; SQL that fails to parse is no
   longer logged at `WARN` (it could contain credentials/PII). (https://github.com/ClickHouse/clickhouse-java/issues/2970)
 - **[client-v2]** Fixed `BigDecimal` values written into a `Dynamic` column being silently truncated when the

clickhouse-client/src/main/java/com/clickhouse/client/ClickHouseDnsResolver.java

@@ -1,10 +1,10 @@
 package com.clickhouse.client;
 
 import java.net.InetSocketAddress;
+import java.util.ServiceLoader;
 
 import com.clickhouse.client.config.ClickHouseDefaults;
 import com.clickhouse.client.naming.SrvResolver;
-import com.clickhouse.data.ClickHouseUtils;
 import com.clickhouse.logging.Logger;
 import com.clickhouse.logging.LoggerFactory;
 
@@ -17,8 +17,18 @@
 public class ClickHouseDnsResolver {
     private static final Logger log = LoggerFactory.getLogger(ClickHouseDnsResolver.class);
 
-    private static final ClickHouseDnsResolver instance = ClickHouseUtils.getService(ClickHouseDnsResolver.class,
-            new ClickHouseDnsResolver());
+    private static final ClickHouseDnsResolver instance = loadResolver();
+
+    private static ClickHouseDnsResolver loadResolver() {
+        for (ClickHouseDnsResolver resolver : ServiceLoader.load(ClickHouseDnsResolver.class,
+                ClickHouseDnsResolver.class.getClassLoader())) {
+            if (resolver != null) {
+                return resolver;
+            }
+        }
+
+        return new ClickHouseDnsResolver();
+    }
 
     protected static ClickHouseDnsResolver newInstance() {
         ClickHouseDnsResolver resolver = null;

clickhouse-client/src/main/java/com/clickhouse/client/ClickHouseRequestManager.java

@@ -1,9 +1,9 @@
 package com.clickhouse.client;
 
+import java.util.ServiceLoader;
 import java.util.UUID;
 
 import com.clickhouse.data.ClickHouseChecker;
-import com.clickhouse.data.ClickHouseUtils;
 
 /**
  * Request manager is responsible for generating query and session ID, as well
@@ -17,13 +17,23 @@ public class ClickHouseRequestManager {
      * Inner class for static initialization.
      */
     static final class InstanceHolder {
-        private static final ClickHouseRequestManager instance = ClickHouseUtils
-                .getService(ClickHouseRequestManager.class, ClickHouseRequestManager::new);
+        private static final ClickHouseRequestManager instance = loadManager();
 
         private InstanceHolder() {
         }
     }
 
+    private static ClickHouseRequestManager loadManager() {
+        for (ClickHouseRequestManager manager : ServiceLoader.load(ClickHouseRequestManager.class,
+                ClickHouseRequestManager.class.getClassLoader())) {
+            if (manager != null) {
+                return manager;
+            }
+        }
+
+        return new ClickHouseRequestManager();
+    }
+
     /**
      * Gets instance of request manager.
      *

clickhouse-client/src/main/java11/module-info.java

@@ -11,5 +11,6 @@
 
     uses com.clickhouse.client.ClickHouseClient;
     uses com.clickhouse.client.ClickHouseDnsResolver;
+    uses com.clickhouse.client.ClickHouseRequestManager;
     uses com.clickhouse.client.ClickHouseSslContextProvider;
 }

clickhouse-client/src/main/java9/module-info.java

@@ -11,5 +11,6 @@
 
     uses com.clickhouse.client.ClickHouseClient;
     uses com.clickhouse.client.ClickHouseDnsResolver;
+    uses com.clickhouse.client.ClickHouseRequestManager;
     uses com.clickhouse.client.ClickHouseSslContextProvider;
 }

clickhouse-client/src/test/java/com/clickhouse/client/ClickHouseClientTest.java

@@ -5,6 +5,9 @@
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.concurrent.ExecutionException;
 
 import com.clickhouse.client.ClickHouseRequest.Mutation;
@@ -65,4 +68,19 @@ public void testMutation() throws ExecutionException, InterruptedException {
         Assert.assertNull(req.sql);
         Assert.assertNull(req.table("my_table").format(ClickHouseFormat.RowBinary).execute().get());
     }
+
+    @Test(groups = { "unit" })
+    public void testClientModuleDeclaresLoadedServices() throws IOException {
+        Assert.assertNotNull(ClickHouseDnsResolver.getInstance());
+        Assert.assertNotNull(ClickHouseRequestManager.getInstance());
+        assertModuleInfoDeclaresUses("src/main/java9/module-info.java");
+        assertModuleInfoDeclaresUses("src/main/java11/module-info.java");
+    }
+
+    private static void assertModuleInfoDeclaresUses(String moduleInfo) throws IOException {
+        String baseDir = System.getProperty("basedir", ".");
+        String content = new String(Files.readAllBytes(Paths.get(baseDir, moduleInfo)), StandardCharsets.UTF_8);
+        Assert.assertTrue(content.contains("uses com.clickhouse.client.ClickHouseDnsResolver;"), moduleInfo);
+        Assert.assertTrue(content.contains("uses com.clickhouse.client.ClickHouseRequestManager;"), moduleInfo);
+    }
 }