java -jar wildfly-elytron-tool.jar credential-store -h 

java -jar wildfly-elytron-tool.jar credential-store -h --salt 12345678 --iteration 230

usage: java -jar wildfly-elytron-tool.jar credential-store <sub-command>
       <options> -a <arg> | -e <arg> | -h | -r <arg> | -v [-c]  [-f]  [-i
       <arg>] [-l <arg>] [-p <arg>]  [-s <arg>] [-t <arg>] [-u <arg>]  [-x
       <arg>]

Exception in thread "main" java.lang.NullPointerException
    at java.util.regex.Matcher.getTextLength(Matcher.java:1283)
    at java.util.regex.Matcher.reset(Matcher.java:309)
    at java.util.regex.Matcher.<init>(Matcher.java:229)
    at java.util.regex.Pattern.matcher(Pattern.java:1093)
    at java.util.Formatter.parse(Formatter.java:2547)
    at java.util.Formatter.format(Formatter.java:2501)
    at java.io.PrintStream.format(PrintStream.java:970)
    at java.io.PrintStream.printf(PrintStream.java:871)
    at org.wildfly.security.tool.ElytronTool.main(ElytronTool.java:58)