Merge pull request #19 from yunusga/upgrade

Closes #18, Add notice to console about possible not installed Java and update vnu-jar from 20.6.30 to 21.10.12

Author: OlehDutchenko

lib/validator.js

@@ -218,6 +218,18 @@ function nodeW3CValidator (validationPath, userOptions, done) {
 			}
 		}
 
+		// Test for Java Installed
+		try {
+			JSON.parse(stderr); // JSON string with empty "messages"
+		} catch (e) {
+			console.log('\n');
+			console.log(chalk.red('ERROR:'), 'An unexpected error has occurred');
+			console.log('It looks like you haven\'t installed Java');
+			console.log('- https://github.com/dutchenkoOleg/node-w3c-validator#attention');
+			console.log('- https://java.com');
+			process.exit(1);
+		}
+
 		if (err === null) {
 			output = stdout;
 			spinner.succeed(`${pkg.name} - no errors`);

package-lock.json

@@ -51,7 +51,7 @@
     "lodash": ">=4.17.20",
     "mkdirp": "^1.0.4",
     "ora": "^5.1.0",
-    "vnu-jar": "^20.6.30"
+    "vnu-jar": "^21.10.12"
   },
   "devDependencies": {
     "eslint": ">=7.14.0",