Fixed javadoc and improved test

Author: chernser

client-v2/src/main/java/com/clickhouse/client/api/TransportException.java

@@ -1,9 +1,9 @@
 package com.clickhouse.client.api;
 
 /**
- * Any exception that happens inside transport logic and hard to categorize as client logic
- * like connection initiation or data transfer. These exceptions are not retriable normally.
- * Main purpose of this exception is to wrap transport specific.
+ * Transport-layer exception that is hard to categorize as connection initiation or data transfer.
+ * These exceptions are not retryable by default.
+ * Main purpose of this exception is to wrap transport-specific failures (e.g., SSL errors).
  */
 public class TransportException extends ClickHouseException {
     public TransportException(String message, Throwable cause, String queryId) {

client-v2/src/test/java/com/clickhouse/client/ErrorHandlingTests.java

@@ -91,9 +91,13 @@ void testTransportException() throws Exception {
                 .compressClientRequest(true)
                 .build()) {
 
+            final String queryId = "test-failure-query-id";
             TransportException tex = Assert.expectThrows(TransportException.class,
-                    () -> client.query("SELECT 1").get());
-            Assert.assertTrue(tex.getMessage().contains("SSL Problem"));
+                    () -> client.query("SELECT 1", new QuerySettings().setQueryId(queryId)).get());
+            Assert.assertTrue(tex.getMessage().startsWith("SSL Problem"), "Unexpected message: " + tex.getMessage());
+            Assert.assertEquals(tex.getQueryId(), queryId);
+            Assert.assertTrue(tex.getCause() instanceof javax.net.ssl.SSLException,
+                    "Expected SSLException cause but was: " + tex.getCause());
         }
     }