initial: neoforge 1.21.1 port - first compile fix pass

build.gradle

@@ -0,0 +1,69 @@
+plugins {
+    id 'eclipse'
+    id 'net.neoforged.gradle.userdev' version '7.1.20'
+    id 'com.github.johnrengelman.shadow' version '8.1.1'
+}
+
+group = 'us.dynmap'
+version = '3.7-SNAPSHOT-Dev'
+archivesBaseName = 'Dynmap-neoforge-1.21.1'
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
+
+println('Java: ' + System.getProperty('java.version') + ' JVM: ' + System.getProperty('java.vm.version') + ' Arch: ' + System.getProperty('os.arch'))
+
+repositories {
+    mavenCentral()
+    maven { url 'https://maven.neoforged.net/releases' }
+    maven { url 'https://libraries.minecraft.net' }
+    // Local file dependencies
+    flatDir { dirs 'libs' }
+}
+
+minecraft {
+    accessTransformers {
+        file('src/main/resources/META-INF/accesstransformer.cfg')
+    }
+}
+
+dependencies {
+    implementation 'net.neoforged:neoforge:21.1.219'
+    // DynmapCore and DynmapCoreAPI as local jars (build these separately)
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+}
+
+processResources {
+    filesMatching('META-INF/neoforge.mods.toml') {
+        expand(
+            version: project.version,
+            mcversion: '1.21.1'
+        )
+    }
+}
+
+shadowJar {
+    configurations = [project.configurations.shadow]
+    mergeServiceFiles()
+
+    archiveBaseName = 'Dynmap'
+    archiveClassifier = 'neoforge-1.21.1'
+}
+
+tasks.jar {
+    manifest {
+        attributes([
+            'Specification-Title': 'dynmap',
+            'Specification-Vendor': 'mikeprimm',
+            'Specification-Version': '1',
+            'Implementation-Title': project.name,
+            'Implementation-Version': project.version,
+            'Implementation-Vendor': 'mikeprimm',
+        ])
+    }
+}
+
+build.dependsOn(jar)