Cannot obtain keystore password from external source in vault configuration on JBoss EAP 6.

Issue

• With the password mask defined in standalone.xml for KEYSTORE_PASSWORD everything works fine, but the password mask in shell script fails with :

PBOX000140: Unable to get keystore

• Below is the vault configuration and contents of shell script :

<vault>
    <vault-option name="KEYSTORE_URL" value="${jboss.server.base.dir}/hello.jks"/>
    <vault-option name="KEYSTORE_PASSWORD" value="{EXT}/path/to/script/{nameofscript.sh}"/>
.......
</vault>

[jboss@teste11 ~]$ cat nameofscript.sh
#!/bin/bash
echo "MASK-12345555555"