[Java] Add back log argument to the server

java/server/src/org/openqa/selenium/grid/log/LoggingFlags.java

@@ -46,6 +46,10 @@ public class LoggingFlags implements HasRoles {
   @ConfigValue(section = "logging", name = "tracing", example = "true")
   private Boolean enableTracing = true;
 
+  @Parameter(description = "File to write out logs", hidden = true, names = "--log", arity = 1)
+  @ConfigValue(section = "logging", name = "log-file", example = "true")
+  private String logFile;
+
   @Override
   public Set<Role> getRoles() {
     return ALL_ROLES;

java/server/src/org/openqa/selenium/grid/log/LoggingOptions.java

@@ -31,6 +31,9 @@
 import org.openqa.selenium.remote.tracing.empty.NullTracer;
 import org.openqa.selenium.remote.tracing.opentelemetry.OpenTelemetryTracer;
 
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.OutputStream;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Enumeration;
@@ -141,17 +144,32 @@ public void configureLogging() {
 
     // Now configure the root logger, since everything should flow up to that
     Logger logger = logManager.getLogger("");
+    OutputStream out = System.out;
+    try {
+      out = getOutputStream();
+    } catch (FileNotFoundException e) {
+
+    }
 
     if (isUsingPlainLogs()) {
-      Handler handler = new FlushingHandler(System.out);
+      Handler handler = new FlushingHandler(out);
       handler.setFormatter(new TerseFormatter());
       logger.addHandler(handler);
-    }
+  }
 
     if (isUsingStructuredLogging()) {
-      Handler handler = new FlushingHandler(System.out);
+      Handler handler = new FlushingHandler(out);
       handler.setFormatter(new JsonFormatter());
       logger.addHandler(handler);
     }
   }
+
+  private OutputStream getOutputStream() throws FileNotFoundException {
+    String fileName = config.get(LOGGING_SECTION, "log-file").get();
+    FileOutputStream fileOut = null;
+    if (fileName != "null") {
+      fileOut = new FileOutputStream(fileName);
+    }
+    return fileOut;
+  }
 }