diff --git a/dhp-workflows/dhp-graph-provision/src/main/java/eu/dnetlib/dhp/oa/oaipmh/IrishOaiExporterJob.java b/dhp-workflows/dhp-graph-provision/src/main/java/eu/dnetlib/dhp/oa/oaipmh/IrishOaiExporterJob.java
index fff5d015d..b59f0ae73 100644
--- a/dhp-workflows/dhp-graph-provision/src/main/java/eu/dnetlib/dhp/oa/oaipmh/IrishOaiExporterJob.java
+++ b/dhp-workflows/dhp-graph-provision/src/main/java/eu/dnetlib/dhp/oa/oaipmh/IrishOaiExporterJob.java
@@ -4,6 +4,7 @@ import static eu.dnetlib.dhp.common.SparkSessionSupport.runWithSparkSession;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.nio.charset.Charset;
 import java.time.LocalDateTime;
 import java.util.ArrayList;
 import java.util.Optional;
@@ -145,15 +146,14 @@ public class IrishOaiExporterJob {
 	protected static byte[] gzip(final String str) {
 		if (StringUtils.isBlank(str)) { return null; }
 
-		try {
-			final ByteArrayOutputStream obj = new ByteArrayOutputStream();
-			final GZIPOutputStream gzip = new GZIPOutputStream(obj);
-			gzip.write(str.getBytes("UTF-8"));
-			gzip.flush();
-			gzip.close();
-			return obj.toByteArray();
+		try (final ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
+			try (final GZIPOutputStream gzip = new GZIPOutputStream(baos)) {
+				IOUtils.write(str.getBytes(Charset.defaultCharset()), gzip);
+			}
+			return baos.toByteArray();
 		} catch (final IOException e) {
 			throw new RuntimeException("error in gzip", e);
 		}
 	}
+
 }
diff --git a/dhp-workflows/dhp-graph-provision/src/test/java/eu/dnetlib/dhp/oa/oaipmh/IrishOaiExporterJobTest.java b/dhp-workflows/dhp-graph-provision/src/test/java/eu/dnetlib/dhp/oa/oaipmh/IrishOaiExporterJobTest.java
index 6140b0907..e33c701c5 100644
--- a/dhp-workflows/dhp-graph-provision/src/test/java/eu/dnetlib/dhp/oa/oaipmh/IrishOaiExporterJobTest.java
+++ b/dhp-workflows/dhp-graph-provision/src/test/java/eu/dnetlib/dhp/oa/oaipmh/IrishOaiExporterJobTest.java
@@ -6,10 +6,9 @@ import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
-import java.io.BufferedReader;
 import java.io.ByteArrayInputStream;
 import java.io.IOException;
-import java.io.InputStreamReader;
+import java.nio.charset.Charset;
 import java.util.zip.GZIPInputStream;
 
 import org.apache.commons.io.IOUtils;
@@ -57,7 +56,7 @@ class IrishOaiExporterJobTest {
 		final byte[] bytes = IrishOaiExporterJob.gzip(message);
 		assertNotNull(bytes);
 		assertTrue(bytes.length > 0);
-		assertEquals(message, decompress(bytes));
+		assertEquals(message, gunzip(bytes));
 	}
 
 	@Test
@@ -66,22 +65,11 @@ class IrishOaiExporterJobTest {
 		assertNull(IrishOaiExporterJob.gzip(null));
 	}
 
-	private static String decompress(final byte[] compressed) {
-		final StringBuilder outStr = new StringBuilder();
+	public static String gunzip(final byte[] compressed) {
 		if ((compressed == null) || (compressed.length == 0)) { return null; }
-		try {
-			if (isCompressed(compressed)) {
-				final GZIPInputStream gis = new GZIPInputStream(new ByteArrayInputStream(compressed));
-				final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(gis, "UTF-8"));
-
-				String line;
-				while ((line = bufferedReader.readLine()) != null) {
-					outStr.append(line);
-				}
-			} else {
-				outStr.append(compressed);
-			}
-			return outStr.toString();
+		if (!isCompressed(compressed)) { return new String(compressed); }
+		try (final GZIPInputStream gis = new GZIPInputStream(new ByteArrayInputStream(compressed))) {
+			return IOUtils.toString(gis, Charset.defaultCharset());
 		} catch (final IOException e) {
 			throw new RuntimeException("error in gunzip", e);
 		}