Getting Invalid secret key format when starts up the server or accessing to a vault in JBoss EAP

Issue

• Exception thrown or Elytron unable to initialize:

  Caused by: java.io.IOException: Invalid secret key format
      at com.sun.crypto.provider.JceKeyStore.engineLoad(JceKeyStore.java:856)
      at java.security.KeyStore.load(KeyStore.java:1445)
      at org.picketbox.util.KeyStoreUtil.getKeyStore(KeyStoreUtil.java:201)
      at org.picketbox.util.KeyStoreUtil.getKeyStore(KeyStoreUtil.java:151)
      at org.picketbox.plugins.vault.PicketBoxSecurityVault.getKeyStore(PicketBoxSecurityVault.java:688)
      ... 11 more
  

  or

    Caused by: java.io.IOException: Invalid secret key format
    at com.sun.crypto.provider.JceKeyStore.engineLoad(JceKeyStore.java:856)
    at java.security.KeyStore.load(KeyStore.java:1445) [rt.jar:1.8.0_191-1-redhat]
    at org.wildfly.security.credential.store.impl.KeyStoreCredentialStore.load(KeyStoreCredentialStore.java:859) [wildfly-elytron-1.6.1.Final-redhat-00001.jar:1.6.1.Final-redhat-00001]
    ... 11 more
  

• An ObjectInputFilter REJECTED error has been thrown when trying to create a Vault:

  WFLYSEC0056: Initializing Vault
  May 01, 2018 11:13:49 AM java.io.ObjectInputStream filterCheck
  INFO: ObjectInputFilter REJECTED: null, array length: -1, nRefs: 1, depth: 1, bytes: 70, ex: n/a
  WFLYSEC0059: Exception encountered:WFLYSEC0045: Exception encountered:
  

• NullPointerException in log:

  Caused by: org.jboss.security.vault.SecurityVaultException: java.lang.NullPointerException
         at org.picketbox.plugins.vault.PicketBoxSecurityVault.init(PicketBoxSecurityVault.java:192)
         at org.jboss.as.security.vault.RuntimeVaultReader.createVault(RuntimeVaultReader.java:82) [jboss-as-security-7.3.0.Final-redhat-14.jar:7.3.0.Final-redhat-14]
         ... 11 more
   Caused by: java.lang.NullPointerException
         at org.picketbox.plugins.vault.PicketBoxSecurityVault.checkAndConvertKeyStoreToJCEKS(PicketBoxSecurityVault.java:527)
         at org.picketbox.plugins.vault.PicketBoxSecurityVault.init(PicketBoxSecurityVault.java:189)
         ... 12 more
  

• Server doesn't start because it can't find the vault file.