[keycloak-user] Cannot create Drolls policy.

Hi, I'm using the keycloak version 2.0.0.Final with default standalone. I've build and install the maven artifact, the "org.keycloak:photoz-authz-policy:2.0.0.Final" and tried to create the Drools policy. as the following mavenArtifactGroupId = org.keycloak mavenArtifactId = photoz-authz-policy mavenArtifactVersion = 2.0.0.Final" When I click the "Resolve" button, the system shows me as "Error! An unexpected server error has occurred" The "standalone/log/server.log" also shows as [io.undertow.request] (default task-80) UT005023: Exception handling request to /auth/admin/realms/photoz/clients/001e0705-8bc6-47de-b408-dd07a5ebba9b/authz/resource-server/policy/drools/resolveModules: org.jboss.resteasy.spi.UnhandledException: java.lang.NoClassDefFoundError: org/apache/commons/codec/binary/Base64 at org.jboss.resteasy.core.ExceptionHandler.handleApplicationException(ExceptionHandler.java:76) ... Caused by: java.lang.NoClassDefFoundError: org/apache/commons/codec/binary/Base64 at org.apache.http.impl.auth.BasicScheme.authenticate(BasicScheme.java:168) I can ensure that 1. The "commons-codec-1.10.jar" is existed at "modules/system/layers/base/org/apache/commons/codec/main" 2. The "org.keycloak:photoz-authz-policy:2.0.0.Final" is existed at my local repository at "some/drive/m2/repo/org/keycloak/photoz-authz-policy/2.0.0.Final/photoz-authz-policy-2.0.0.Final.jar". Could you please help to advise further? -- Best Regards, Charlee Ch