Nifi: how to remove session based on atribute value in nifi - groovy

Question

I want to remove session in case i get certain data from file i have code like this,but i got errors "flowfile has already marked for removal", what should i change to get rid of extra errors?
In case of session rollback flowfile will dissapear in queues also?
2.should i use rollback instead of remove()?
NodeList childNodes = nodeGettingChanged.getChildNodes();
for (int i = 0; i != childNodes.getLength(); ++i) {
Node child = childNodes.item(i);
if (!(child instanceof Element))
continue;
if (child.getNodeName().equals("runAs")) {
if(child.getFirstChild().getTextContent()=="false"){
session.remove(flowFile1);
File deleteExtraFile =new File("C://Users//s.tkhilaishvili//Desktop//try2//nifi-1.3.0//1//conf.xml");
boolean delete=deleteExtraFile.delete();
}
else {
child.getFirstChild().setNodeValue("false");
}
}
}
Document finalXmlDocument = xmlDocument;
session.write(flowFile1, new StreamCallback() {
public void process(InputStream inputStream, OutputStream outputStream) throws IOException {
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = null;
try {
transformer = transformerFactory.newTransformer();
} catch (TransformerConfigurationException e) {
e.printStackTrace();
}
DOMSource source = new DOMSource(finalXmlDocument);
ffStream.close();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
StreamResult result = new StreamResult(bos);
try {
transformer.transform(source, result);
} catch (TransformerException e) {
e.printStackTrace();
}
byte[] array = bos.toByteArray();
outputStream.write(array);
}
});
session.remove(flowFile);
session.transfer(flowFile1, REL_SUCCESS);
}

Answer 1

If you are executing session.remove(flowFile1) then later trying to transfer it to REL_SUCCESS, you will get that error. It looks like you already have an if-clause checking the firstChild for "false", perhaps you could put the transfer in an else-clause, such that it will only be transferred if it wasn't removed.