a modular awakening begins?

build.gradle.kts

@@ -24,13 +24,18 @@ repositories {
     }
 }
 
+java {
+    modularity.inferModulePath.set(false)
+}
+
 val ap by sourceSets.registering {
     compileClasspath += sourceSets.main.get().compileClasspath + sourceSets.main.get().output
 }
 
 // Project dependencies
 val adventureVersion: String by project
 val configurateVersion: String by project
+val geantyrefVersion: String by project
 val gsonVersion: String by project
 val guavaVersion: String by project
 val log4jVersion: String by project
@@ -113,6 +118,9 @@ dependencies {
         exclude(group = "com.google.inject", module = "guice")
     }
 
+    // Generic type reflection + capture library (used by Configurate, we bump the version for a module name)
+    api("io.leangen.geantyref:geantyref:$geantyrefVersion")
+
     // Compile-time static analysis
     compileOnly("com.google.errorprone:error_prone_annotations:$errorproneVersion")
     errorprone("com.google.errorprone:error_prone_core:$errorproneVersion")
@@ -170,6 +178,10 @@ tasks {
             compilerArgs.addAll(listOf("-Xlint:-path"))
             isDeprecation = false
         }
+
+        doFirst {
+            options.compilerArgs.addAll(listOf("--module-path", classpath.asPath))
+        }
     }
 
     javadoc {
@@ -189,6 +201,10 @@ tasks {
                 addBooleanOption("quiet", true)
             }
         }
+
+        doFirst {
+            options.modulePath(classpath.toList())
+        }
     }
 
     withType(JavaCompile::class).configureEach {

gradle.properties

@@ -13,11 +13,12 @@ caffeineVersion=3.1.1
 checkstyleVersion=10.3.4
 configurateVersion=4.1.2
 errorproneVersion=2.16
+geantyrefVersion=1.3.13
 gsonVersion=2.8.9
 guavaVersion=31.0.1-jre
 junitVersion=5.9.1
 log4jVersion=2.17.0
 
 mathVersion=2.0.1
 mockitoVersion=4.8.0
-pluginSpiVersion=0.3.0
+pluginSpiVersion=0.3.1-SNAPSHOT

src/main/java/module-info.java

@@ -0,0 +1,39 @@
+open module org.spongepowered.api {
+    requires transitive java.desktop;
+    requires transitive java.sql;
+
+    requires transitive org.apache.logging.log4j;
+    requires transitive com.google.common; // guava
+    requires transitive com.google.gson;
+
+    requires transitive net.kyori.adventure;
+    requires transitive net.kyori.adventure.text.serializer.gson;
+    requires transitive net.kyori.adventure.text.serializer.legacy;
+    requires transitive net.kyori.adventure.text.serializer.plain;
+    requires transitive net.kyori.adventure.text.minimessage;
+
+    requires transitive com.google.guice;
+    requires transitive com.github.benmanes.caffeine;
+    requires transitive com.github.benmanes.caffeine.guava;
+
+    requires transitive org.spongepowered.plugin.spi;
+    requires transitive org.spongepowered.plugin.metadata;
+
+    requires transitive org.spongepowered.configurate;
+    requires transitive org.spongepowered.configurate.hocon;
+    requires transitive org.spongepowered.configurate.gson;
+    requires transitive org.spongepowered.configurate.yaml;
+    requires transitive org.spongepowered.configurate.extra.guice;
+
+    requires static transitive com.google.errorprone.annotations;
+    requires static transitive org.checkerframework.checker.qual;
+    requires static transitive org.jetbrains.annotations; // via adventure (unneeded once Adventure gets real module descriptors)
+
+    requires transitive org.spongepowered.math;
+    requires transitive io.leangen.geantyref;
+
+    // AP
+    requires transitive java.compiler;
+
+    // provides javax.annotation.processing.Processor with org.spongepowered.plugin.processor.ListenerProcessor; // TODO
+}

src/main/java/org/spongepowered/api/datapack/DataPackTypes.java

@@ -65,7 +65,7 @@ public final class DataPackTypes {
 
     public static final DataPackType<TagTemplate<ItemType>> ITEM_TAG = Sponge.game().factoryProvider().provide(DataPackType.Factory.class).tag(RegistryTypes.ITEM_TYPE);
 
-    public static final DataPackType<TagTemplate<EntityType<?>>> ENTITY_TAG = Sponge.game().factoryProvider().provide(DataPackType.Factory.class).tag((RegistryType<EntityType<?>>) RegistryTypes.ENTITY_TYPE);
+    public static final DataPackType<TagTemplate<EntityType<?>>> ENTITY_TAG = Sponge.game().factoryProvider().provide(DataPackType.Factory.class).tag((RegistryType<EntityType<?>>) (RegistryType) RegistryTypes.ENTITY_TYPE);
 
     public static final DataPackType<TagTemplate<Biome>> BIOME_TAG = Sponge.game().factoryProvider().provide(DataPackType.Factory.class).tag(RegistryTypes.BIOME);