How to solve a FolderClosedIOException? - apache

Question

So I am new to Apache Camel. I know that most of this code is probably not the most efficient way to do this, but I have made a code that uses Apache Camel to access my gmail, grab the new messages and if they have attachments save the attachments in a specified directory. My route saves the body data as a file in that directory. Everytime the DataHandler tries to use the getContent() method, whether its saving a file or trying to print the body to System.out, I get either a FolderClosedIOException or a FolderClosed Exception. I have not clue how to fix it. The catch reopens the folder but it just closes again after getting another message.
import org.apache.camel.*;
import java.io.*;
import java.util.*;
import javax.activation.DataHandler;
import javax.mail.Folder;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.impl.DefaultCamelContext;
import com.sun.mail.util.FolderClosedIOException;
public class Imap {
public static void main(String[] args) throws Exception {
CamelContext context = new DefaultCamelContext();
context.addRoutes(new RouteBuilder() {
public void configure() {
from("imaps://imap.gmail.com?username=********#gmail.com&password=******"
+ "&debugMode=false&closeFolder=false&mapMailMessage=false"
+ "&connectionTimeout=0").to("file:\\EMAIL");
}
});
Map<String,String> props = new HashMap<String,String>();
props.put("mail.imap.socketFactory.class","javax.net.ssl.SSLSocketFactory");
props.put("mail.imap.auth", "true");
props.put("mail.imap.host","imap.gmail.com");
props.put("mail.store.protocol", "imaps");
context.setProperties(props);
Folder inbox = null;
ConsumerTemplate template = context.createConsumerTemplate();
context.start();
while(true) {
try {
Exchange e = template.receive("imaps://imap.gmail.com?username=*********#gmail.com&password=***********", 60000);
if(e == null) break;
Message m = e.getIn();
Map<String, Object> s = m.getHeaders();
Iterator it = s.entrySet().iterator();
while(it.hasNext()) {
Map.Entry pairs = (Map.Entry)it.next();
System.out.println(pairs.getKey()+" === "+pairs.getValue()+"\n\n");
it.remove();
}
if(m.hasAttachments()) {
Map<String,DataHandler> att = m.getAttachments();
for(String s1 : att.keySet()) {
DataHandler dh = att.get(s1);
String filename = dh.getName();
ByteArrayOutputStream o = new ByteArrayOutputStream();
dh.writeTo(o);
byte[] by = o.toByteArray();
FileOutputStream out = new FileOutputStream("C:/EMAIL/"+filename);
out.write(by);
out.flush();
out.close();
}
}
} catch(FolderClosedIOException ex) {
inbox = ex.getFolder();
inbox.open(Folder.READ_ONLY);
}
}
context.stop();
}
}
Please somebody tell me whats wrong!!
The error occurs here:
dh.writeTo(o);

Answer 1

We were was solving a similar problem in akka-camel
The solution i believe was to use manual acknowledgement and send an acknowledgement after we were done with the message.