Cut down on useless startup logging

src/main/java/net/neoforged/camelot/util/LoggingFilter.java

@@ -0,0 +1,26 @@
+package net.neoforged.camelot.util;
+
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.core.filter.Filter;
+import ch.qos.logback.core.spi.FilterReply;
+
+/**
+ * A Logback filter that filters out unneeded messages.
+ */
+public class LoggingFilter extends Filter<ILoggingEvent> {
+    @Override
+    public FilterReply decide(ILoggingEvent event) {
+        return test(event) ? FilterReply.NEUTRAL : FilterReply.DENY;
+    }
+
+    private boolean test(ILoggingEvent event) {
+        return switch (event.getLoggerName()) {
+            case "org.flywaydb.core.internal.command.DbMigrate" -> !event.getMessage().endsWith("No migration necessary.");
+            case "org.flywaydb.core.internal.command.DbValidate" -> !event.getMessage().startsWith("Successfully validated");
+
+            case "io.javalin.Javalin" -> !event.getMessage().equals("Your JDK supports Loom. Javalin will prefer Virtual Threads by default. Disable with `ConcurrencyUtil.useLoom = false`.")
+                    && !event.getMessage().startsWith("Static file handler added:");
+            default -> true;
+        };
+    }
+}

src/main/resources/logback.xml

@@ -31,9 +31,17 @@
                 %logger{50}/%marker - %msg%n
             </pattern>
         </encoder>
+
+        <!-- Filter out unneeded messages from the console -->
+        <filter class="net.neoforged.camelot.util.LoggingFilter" />
     </appender>
     <!--Log levels include ERROR, WARN, INFO, DEBUG, TRACE -->
     <root level="INFO">
         <appender-ref ref="CONSOLE" />
     </root>
+
+    <!-- Disable the annoying useless printout -->
+    <logger name="org.flywaydb.core.internal.license.VersionPrinter" level="OFF" />
+    <!-- Disable the duplicate logging -->
+    <logger name="org.flywaydb.core.internal.database.base.BaseDatabaseType" level="OFF" />
 </configuration>