actually quieten logs by redirecting jul logging to slf4j

build.gradle

@@ -71,6 +71,9 @@ dependencies {
     }
     implementation('dev.bwt:bwt-jni:0.1.7')
     implementation('net.sourceforge.javacsv:javacsv:2.0')
+    implementation('org.slf4j:jul-to-slf4j:1.7.30') {
+        exclude group: 'org.slf4j'
+    }
     testImplementation('junit:junit:4.12')
 }
 

src/main/java/com/sparrowwallet/sparrow/MainApp.java

@@ -21,6 +21,7 @@ import javafx.stage.Stage;
 import org.controlsfx.glyphfont.GlyphFontRegistry;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.slf4j.bridge.SLF4JBridgeHandler;
 
 import java.io.File;
 import java.util.*;
@@ -156,6 +157,8 @@ public class MainApp extends Application {
             getLogger().info("Using " + Network.get() + " configuration");
         }
 
+        SLF4JBridgeHandler.removeHandlersForRootLogger();
+        SLF4JBridgeHandler.install();
         com.sun.javafx.application.LauncherImpl.launchApplication(MainApp.class, MainAppPreloader.class, argv);
     }
 

src/main/java/module-info.java

@@ -28,4 +28,5 @@ open module com.sparrowwallet.sparrow {
     requires bwt.jni;
     requires jtorctl;
     requires javacsv;
+    requires jul.to.slf4j;
 }

src/main/resources/logback.xml

@@ -1,10 +1,11 @@
 <configuration>
     <statusListener class="ch.qos.logback.core.status.NopStatusListener" />
+    <contextListener class="ch.qos.logback.classic.jul.LevelChangePropagator"/>
 
     <logger name="com.github.sarxos.webcam.Webcam" level="OFF"/>
     <logger name="com.github.sarxos.webcam.ds.cgt.WebcamOpenTask" level="OFF"/>
     <logger name="com.github.sarxos.webcam.ds.cgt.WebcamCloseTask" level="OFF"/>
-    <logger name="javafx.scene.CssStyleHelper" level="OFF"/>
+    <logger name="javafx.scene.CssStyleHelper" level="ERROR"/>
 
     <define name="appDir" class="com.sparrowwallet.drongo.PropertyDefiner">
         <application>sparrow</application>