src/main/java/org/apache/sling/distribution/packaging/impl/AbstractDistributionPackageBuilder.java [221:238]:
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    private Session getSession(ResourceResolver resourceResolver) throws RepositoryException {
        Session session = resourceResolver.adaptTo(Session.class);
        if (session != null) {
            // this is needed in order to avoid loops in sync case when there're deletions, otherwise it could work with sling resources
            DistributionJcrUtils.setDoNotDistribute(session);
        } else {
            throw new RepositoryException("could not obtain a session from calling user " + resourceResolver.getUserID());
        }
        return session;
    }

    private void ungetSession(Session session) {
        if (session != null) {
            try {
                if (session.hasPendingChanges()) {
                    session.save();
                }
            } catch (RepositoryException e) {
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src/main/java/org/apache/sling/distribution/serialization/impl/vlt/FileVaultContentSerializer.java [169:185]:
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    private Session getSession(ResourceResolver resourceResolver) throws RepositoryException {
        Session session = resourceResolver.adaptTo(Session.class);
        if (session != null) {
            DistributionJcrUtils.setDoNotDistribute(session);
        } else {
            throw new RepositoryException("could not obtain a session from calling user " + resourceResolver.getUserID());
        }
        return session;
    }

    private void ungetSession(Session session) {
        if (session != null) {
            try {
                if (session.hasPendingChanges()) {
                    session.save();
                }
            } catch (RepositoryException e) {
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