Capture Client Guest OS and architecture in JDBC

src/main/java/com/microsoft/sqlserver/jdbc/SQLServerConnection.java

@@ -2446,7 +2446,7 @@ Connection connectInternal(Properties propsIn,
                 if (null != sPropValue)
                     validateMaxSQLLoginName(sPropKey, sPropValue);
                 else
-                    activeConnectionProperties.setProperty(sPropKey, SQLServerDriver.DEFAULT_APP_NAME);
+                    activeConnectionProperties.setProperty(sPropKey, SQLServerDriver.constructedAppName);
 
                 sPropKey = SQLServerDriverBooleanProperty.LAST_UPDATE_COUNT.toString();
                 sPropValue = activeConnectionProperties.getProperty(sPropKey);

src/main/java/com/microsoft/sqlserver/jdbc/SQLServerDriver.java

@@ -731,7 +731,32 @@ public final class SQLServerDriver implements java.sql.Driver {
     static final String AUTH_DLL_NAME = "mssql-jdbc_auth-" + SQLJdbcVersion.MAJOR + "." + SQLJdbcVersion.MINOR + "."
             + SQLJdbcVersion.PATCH + "." + Util.getJVMArchOnWindows() + SQLJdbcVersion.RELEASE_EXT;
     static final String DEFAULT_APP_NAME = "Microsoft JDBC Driver for SQL Server";
+    static final String APP_NAME_TEMPLATE = "Microsoft JDBC - %s, %s - %s";
+    static final String constructedAppName;
+    static {
+        constructedAppName = getAppName();
+    }
 
+    /**
+     * Constructs the application name using system properties for OS, platform, and architecture.
+     * If any of the properties cannot be fetched, it falls back to the default application name.
+     * Format -> Microsoft JDBC - {OS}, {Platform} - {architecture}
+     *
+     * @return the constructed application name or the default application name if properties are not available
+     */
+    static String getAppName() {
+        String osName = System.getProperty("os.name", "");
+        String osArch = System.getProperty("os.arch", "");
+        String javaVmName = System.getProperty("java.vm.name", "");
+        String javaVmVersion = System.getProperty("java.vm.version", "");
+        String platform = javaVmName.isEmpty() || javaVmVersion.isEmpty() ? "" : javaVmName + " " + javaVmVersion;
+
+        if (osName.isEmpty() && platform.isEmpty() && osArch.isEmpty()) {
+            return DEFAULT_APP_NAME;
+        }
+        return String.format(APP_NAME_TEMPLATE, osName, platform, osArch);
+    }
+
     private static final String[] TRUE_FALSE = {"true", "false"};
 
     private static final SQLServerDriverPropertyInfo[] DRIVER_PROPERTIES = {
@@ -741,7 +766,7 @@ public final class SQLServerDriver implements java.sql.Driver {
                     SQLServerDriverStringProperty.APPLICATION_INTENT.getDefaultValue(), false,
                     new String[] {ApplicationIntent.READ_ONLY.toString(), ApplicationIntent.READ_WRITE.toString()}),
             new SQLServerDriverPropertyInfo(SQLServerDriverStringProperty.APPLICATION_NAME.toString(),
-                    SQLServerDriverStringProperty.APPLICATION_NAME.getDefaultValue(), false, null),
+            		SQLServerDriverStringProperty.APPLICATION_NAME.getDefaultValue(), false, null),
             new SQLServerDriverPropertyInfo(SQLServerDriverStringProperty.COLUMN_ENCRYPTION.toString(),
                     SQLServerDriverStringProperty.COLUMN_ENCRYPTION.getDefaultValue(), false,
                     new String[] {ColumnEncryptionSetting.DISABLED.toString(),
@@ -1028,6 +1053,9 @@ String getClassNameLogging() {
                 drLogger.finer("Error registering driver: " + e);
             }
         }
+        if (loggerExternal.isLoggable(Level.FINE)) {
+            loggerExternal.log(Level.FINE, "Application Name: " + SQLServerDriver.constructedAppName);
+        }
     }
 
     // Check for jdk.net.ExtendedSocketOptions to set TCP keep-alive options for idle connection resiliency
@@ -1266,6 +1294,7 @@ public java.sql.Connection connect(String url, Properties suppliedProperties) th
         Properties connectProperties = parseAndMergeProperties(url, suppliedProperties);
         if (connectProperties != null) {
             result = DriverJDBCVersion.getSQLServerConnection(toString());
+            connectProperties.setProperty(SQLServerDriverStringProperty.APPLICATION_NAME.toString(), SQLServerDriver.constructedAppName);
             result.connect(connectProperties, null);
         }
         loggerExternal.exiting(getClassNameLogging(), "connect", result);

src/test/java/com/microsoft/sqlserver/jdbc/SQLServerDriverTest.java

@@ -2,6 +2,8 @@
 
 import static org.junit.Assert.fail;
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.sql.Connection;
@@ -190,4 +192,40 @@ public void testConnectionDriver() throws SQLException {
             }
         }
     }
+
+    /**
+     * test application name
+     * 
+     * @throws SQLException
+     */
+    @Test
+    public void testApplicationName() throws SQLException {
+        try (Connection conn = DriverManager.getConnection(connectionString);
+             Statement stmt = conn.createStatement();
+             ResultSet rs = stmt.executeQuery("SELECT program_name FROM sys.dm_exec_sessions WHERE session_id = @@SPID")) {
+            if (rs.next()) {
+                assertEquals(SQLServerDriver.constructedAppName, rs.getString("program_name"));
+            }
+        } catch (SQLException e) {
+            fail(e.getMessage());
+        }
+    }
+
+    /**
+     * test application name when system properties are empty
+     * 
+     */
+    @Test
+    public void testGetAppName() {
+        String appName = SQLServerDriver.getAppName();
+        assertNotNull(appName, "Application name should not be null");
+        assertFalse(appName.isEmpty(), "Application name should not be empty");
+
+        System.setProperty("os.name", "");
+        System.setProperty("os.arch", "");
+        System.setProperty("java.vm.name", "");
+        System.setProperty("java.vm.version", "");
+        String defaultAppName = SQLServerDriver.getAppName();
+        assertEquals(SQLServerDriver.DEFAULT_APP_NAME, defaultAppName, "Application name should be the default one");
+    }
 }