src/main/java/org/apache/sling/jcr/jackrabbit/accessmanager/post/AbstractAccessGetServlet.java [131:139]:
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        if (principalId == null) {
            throw new RepositoryException("principalId was not submitted.");
        }

        // validate that the submitted name is valid
        PrincipalManager principalManager = AccessControlUtil.getPrincipalManager(jcrSession);
        Principal principal = principalManager.getPrincipal(principalId);
        if (principal == null) {
            throw new RepositoryException("Invalid principalId was submitted.");
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src/main/java/org/apache/sling/jcr/jackrabbit/accessmanager/post/ModifyAceServlet.java [266:274]:
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        if (principalId == null) {
            throw new RepositoryException("principalId was not submitted.");
        }

        // validate that the submitted name is valid
        PrincipalManager principalManager = AccessControlUtil.getPrincipalManager(jcrSession);
        Principal principal = principalManager.getPrincipal(principalId);
        if (principal == null) {
            throw new RepositoryException("Invalid principalId was submitted.");
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