Don't worry if we can't determine the Java version

modules/API/src/main/java/com/comphenix/protocol/utility/Util.java

@@ -63,10 +63,14 @@ public class Util {
 
 	/**
 	 * Gets the currently running major Java version.
-	 * @return The version
+	 * @return The version or -1 if it could not be found
 	 */
 	public static int getJavaVersion() {
-		String version = Runtime.class.getPackage().getSpecificationVersion();
-		return (int) (Double.valueOf(version) * 10 % 10);
+		try {
+			String version = Runtime.class.getPackage().getSpecificationVersion();
+			return (int) (Double.parseDouble(version) * 10 % 10);
+		} catch (Throwable ex) {
+			return -1;
+		}
 	}
 }

modules/ProtocolLib/src/main/java/com/comphenix/protocol/ProtocolLib.java

@@ -156,7 +156,7 @@ public class ProtocolLib extends JavaPlugin {
 		ProtocolLogger.init(this);
 
 		int java = Util.getJavaVersion();
-		if (java < 8 && !getConfig().getBoolean("ignoreJava", false)) {
+		if (java != -1 && java < 8 && !getConfig().getBoolean("ignoreJava", false)) {
 			logger.warning("Detected outdated Java version: Java " + java);
 			logger.warning("It is recommended that you update to Java 8 as soon as possible.");
 			logger.warning("Future versions of ProtocolLib many not support Java " + java + ".");