[mchoma@localhost bin]$ java -jar wildfly-elytron-tool.jar credential-store --add myalias --secret supersecretpassword --location="test.store" --uri "cr-store://test?modifiable=true;create=true;keyStoreType=JCEKS" --password mycspassword --summary
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)

[mchoma@localhost bin]$ java -jar wildfly-elytron-tool.jar credential-store --add myalias --secret supersecretpassword --location="test.store" --uri "cr-store://test?modifiable=true;create=true;keyStoreType=JCEKS" --password mycspassword --summary --salt 12345678 --iteration 230
Alias "myalias" has been successfully stored
Credential store command summary:
--------------------------------------
/subsystem=elytron/credential-store=test:add(uri="cr-store://test?modifiable=true;create=true;keyStoreType=JCEKS",relative-to=jboss.server.data.dir,credential-reference={clear-text="MASK-uNWeyrmbByBEjgZM1FAPQW==;12345678;230"})