sbgn2String doens't create temporary file

converter-SBGNML/src/main/java/lcsb/mapviewer/converter/model/sbgnml/SbgnmlXmlConverter.java

@@ -4,7 +4,6 @@ import java.io.*;
 
 import javax.xml.bind.JAXBException;
 
-import org.apache.commons.io.IOUtils;
 import org.apache.commons.text.StringEscapeUtils;
 import org.apache.logging.log4j.core.LogEvent;
 import org.sbgn.SbgnUtil;
@@ -51,10 +50,10 @@ public class SbgnmlXmlConverter extends Converter {
       MinervaLoggerAppender.unregisterLogEventStorage(appender);
     }
     try {
-      File tempFile = File.createTempFile("sbgnmlExportTempFile", ".tmp");
-      SbgnUtil.writeToFile(exportedData, tempFile);
-      try (FileInputStream inputStream = new FileInputStream(tempFile)) {
-        String xml = IOUtils.toString(inputStream, "UTF-8");
+      ByteArrayOutputStream baos = new ByteArrayOutputStream();
+      SbgnUtil.writeTo(exportedData, baos);
+
+      String xml = new String(baos.toByteArray(), "UTF-8");
       if (notes.length() > 0) {
         int position = xml.indexOf("<map language");
         if (position < 0) {
@@ -65,7 +64,6 @@ public class SbgnmlXmlConverter extends Converter {
         xml = xml.substring(0, position) + notesNode + xml.substring(position);
       }
       return xml;
-      }
     } catch (IOException | JAXBException e) {
       throw new ConverterException(e);
     }