src/main/java/org/apache/sling/distribution/packaging/impl/DistributionPackageUtils.java [357:373]:
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        if (holderNames.length == 0) {
            throw new IllegalArgumentException("holder name cannot be null or empty");
        }

        synchronized (filelock) {
            ObjectInputStream inputStream = null;
            ObjectOutputStream outputStream = null;
            try {
                HashSet<String> set;

                if (file.exists()) {
                    inputStream = getSafeObjectInputStream(new FileInputStream(file));
                    @SuppressWarnings("unchecked") // type is known by design
                    HashSet<String> fromStreamSet = (HashSet<String>) inputStream.readObject();
                    set = fromStreamSet;
                } else {
                    set = new HashSet<String>();
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src/main/java/org/apache/sling/distribution/packaging/impl/DistributionPackageUtils.java [393:410]:
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        if (holderNames.length == 0) {
            throw new IllegalArgumentException("holder name cannot be null or empty");
        }

        synchronized (filelock) {
            ObjectInputStream inputStream = null;
            ObjectOutputStream outputStream = null;
            try {

                HashSet<String> set;

                if (file.exists()) {
                    inputStream = getSafeObjectInputStream(new FileInputStream(file));
                    @SuppressWarnings("unchecked") //type is known by design
                    HashSet<String> fromStreamSet = (HashSet<String>) inputStream.readObject();
                    set = fromStreamSet;
                } else {
                    set = new HashSet<String>();
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