normalized arch name (matching arch for for ci)

Author: simschla

lib-extra/src/main/java/com/diffplug/spotless/extra/npm/NpmFormatterStepStateBase.java

@@ -92,7 +92,7 @@ protected File nodeModulePath() {
 	}
 
 	private String j2v8MavenCoordinate() {
-		return "com.eclipsesource.j2v8:j2v8_" + PlatformInfo.normalizedOSName() + "_" + PlatformInfo.archName() + ":4.6.0";
+		return "com.eclipsesource.j2v8:j2v8_" + PlatformInfo.normalizedOSName() + "_" + PlatformInfo.normalizedArchName() + ":4.6.0";
 	}
 
 	protected static String readFileFromClasspath(Class<?> clazz, String name) {

lib-extra/src/main/java/com/diffplug/spotless/extra/npm/PlatformInfo.java

@@ -43,8 +43,19 @@ static String normalizedOSName() {
 		throw new RuntimeException("Cannot handle os " + osNameProperty);
 	}
 
-	static String archName() {
-		return Optional.ofNullable(StandardSystemProperty.OS_ARCH.value())
-				.orElseThrow(() -> new RuntimeException("Arch not detectable."));
+	static String normalizedArchName() {
+		final String osArchProperty = StandardSystemProperty.OS_ARCH.value();
+		if (osArchProperty == null) {
+			throw new RuntimeException("No info about ARCH available, cannot decide which implementation of j2v8 to use");
+		}
+		final String normalizedOsArch = osArchProperty.toLowerCase(Locale.ENGLISH);
+
+		if (normalizedOsArch.contains("64")) {
+			return "x86_64";
+		}
+		if (normalizedOsArch.contains("x86") || normalizedOsArch.contains("32")) {
+			return "x86";
+		}
+		throw new RuntimeException("Cannot handle arch " + osArchProperty);
 	}
 }