assertArgumentNotNull("handler", handler);

        final int startPos = prefix.length();
        ZipEntry entry = null;
        while ((entry = ZipInputStreamUtil.getNextEntry(zipInputStream)) != null) {
            try {
                final String entryName = entry.getName().replace('\\', '/');
                if (entryName.startsWith(prefix) && entryName.endsWith(CLASS_SUFFIX)) {

            final ZipInputStream zis = new ZipInputStream(URLUtil.openStream(zipUrl));
            try {
                ZipEntry entry = null;
                while ((entry = ZipInputStreamUtil.getNextEntry(zis)) != null) {
                    entryNames.add(entry.getName());
                    ZipInputStreamUtil.closeEntry(zis);
                }
            } finally {
                CloseableUtil.close(zis);