fixed java 16 thanks to @davchoo

bootstrap/spigot/build.gradle.kts

@@ -9,6 +9,18 @@ dependencies {
     implementation("org.geysermc.geyser.adapters", "spigot-all", adaptersVersion)
 
     implementation("me.lucko", "commodore", commodoreVersion)
+    
+    // Both paper-api and paper-mojangapi only provide Java 17 versions for 1.19
+    compileOnly("io.papermc.paper", "paper-api", paperVersion) {
+        attributes {
+            attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 17)
+        }
+    }
+    compileOnly("io.papermc.paper", "paper-mojangapi", paperVersion) {
+        attributes {
+            attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 17)
+        }
+    }
 }
 
 platformRelocate("it.unimi.dsi.fastutil")
@@ -19,8 +31,6 @@ platformRelocate("me.lucko.commodore")
 platformRelocate("io.netty.channel.kqueue")
 
 // These dependencies are already present on the platform
-provided("io.papermc.paper", "paper-api", paperVersion)
-provided("io.papermc.paper", "paper-mojangapi", paperVersion)
 provided("com.viaversion", "viaversion", viaVersion)
 
 application {

build-logic/build.gradle.kts

@@ -16,6 +16,6 @@ dependencies {
 
 tasks.withType<KotlinCompile> {
     kotlinOptions {
-        jvmTarget = "17"
+        jvmTarget = "16"
     }
 }

build-logic/src/main/kotlin/geyser.base-conventions.gradle.kts

@@ -26,8 +26,8 @@ tasks {
 }
 
 java {
-    sourceCompatibility = JavaVersion.VERSION_17
+    sourceCompatibility = JavaVersion.VERSION_16
-    targetCompatibility = JavaVersion.VERSION_17
+    targetCompatibility = JavaVersion.VERSION_16
 
     withSourcesJar()
 }