Migrate to java

r5-java/build.gradle

@@ -0,0 +1,37 @@
+plugins {
+    id 'java'
+    id 'application'
+    id 'com.github.johnrengelman.shadow' version '8.1.1'
+}
+
+repositories {
+    mavenCentral()
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(21)
+    }
+}
+
+application {
+    mainClass = 'propertymap.App'
+}
+
+dependencies {
+    implementation 'com.conveyal:r5:7.2'
+    implementation 'io.javalin:javalin:6.4.0'
+    implementation 'com.google.code.gson:gson:2.11.0'
+    implementation 'org.slf4j:slf4j-simple:2.0.16'
+}
+
+jar {
+    manifest {
+        attributes 'Main-Class': 'propertymap.App'
+    }
+}
+
+shadowJar {
+    archiveClassifier = ''
+    mergeServiceFiles()
+}