java.net.SocketException: Software caused connection abort: socket write error

[Nitin Bhardwaj]

Hi Friends,

We use the following code in our servlet to send back an XML file to the client.

ItemDownloadDoc.java class:

private Writer out;
private XmlOutput xmlWriter = new XmlOutput();
private ZipOutputStream zipOutputStream;

// This method initializes the writer out and zipOutputStream instance variables declared above. The OutputStream passed to this method is response.getOutputStream()

private void initialize(OutputStream os, boolean zipped, boolean outputAsXML) throws IOException {
    	this.outputAsXML = outputAsXML;
    	if (zipped) {
    		zipOutputStream = new ZipOutputStream(os);
    		zipOutputStream.setMethod(ZipOutputStream.DEFLATED);
    		ZipEntry zipEntry;
    		if (outputAsXML) {
    			zipEntry = new ZipEntry("download.xml");
    		}
    		else {
    			zipEntry = new ZipEntry("download.csv");
    		}
    		zipEntry.setTime((new Date()).getTime());
    		zipOutputStream.putNextEntry(zipEntry);
    		out = new BufferedWriter(new OutputStreamWriter(zipOutputStream, XmlConstants.STANDARD_FORMAT));
    	} else {
    		out = new BufferedWriter(new OutputStreamWriter(os, XmlConstants.STANDARD_FORMAT));
    	}
    	
    	
    	if (outputAsXML) {
    		out.write(XmlConstants.ITEMS_XML_FILE_OPEN);
    	}
    	out.flush();
    }

// This method we use in our servlet to write an ItemBean object to the XML file which is being sent to the OutputStream. The xmlWriter is just a utility class which takes the ItemBean object and Writer object and then transforms the
// ItemBean object to XML and write to OutputStream using the "out" Writer object passed to it. The Writer(or OutputStream) is not closed in any of xmlWriter's methods.

public void add(ItemBean item) throws IOException {
    	if (outputAsXML) {
    		 xmlWriter.output(item, out); 
    	} else csvWriter.writeItem(item);
    }

// This method is to flush and close the OutputStreams.

public void close() throws IOException {
    	if (outputAsXML) {
    		out.write(XmlConstants.ITEMS_XML_FILE_CLOSE);
    	}
        out.flush();
        
        if (zipOutputStream != null) {
        	zipOutputStream.flush();
        	zipOutputStream.closeEntry();
        	zipOutputStream.close();
        }        
    }

Now the above class works well for downloads of 15 MB in size but when it exceeds that then the following error is thrown:
INFO | jvm 1 | 2010/02/03 08:32:29 | java.net.SocketException: Software caused connection abort: socket write error
INFO | jvm 1 | 2010/02/03 08:32:29 | at java.net.SocketOutputStream.socketWrite0(Native Method)
INFO | jvm 1 | 2010/02/03 08:32:29 | at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
INFO | jvm 1 | 2010/02/03 08:32:29 | at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
INFO | jvm 1 | 2010/02/03 08:32:29 | at org.apache.coyote.http11.InternalOutputBuffer.realWriteBytes(InternalOutputBuffer.java:737)
INFO | jvm 1 | 2010/02/03 08:32:29 | at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:434)
INFO | jvm 1 | 2010/02/03 08:32:29 | at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:349)
INFO | jvm 1 | 2010/02/03 08:32:29 | at org.apache.coyote.http11.InternalOutputBuffer$OutputStreamOutputBuffer.doWrite(InternalOutputBuffer.java:761)
INFO | jvm 1 | 2010/02/03 08:32:29 | at org.apache.coyote.http11.filters.ChunkedOutputFilter.doWrite(ChunkedOutputFilter.java:126)
INFO | jvm 1 | 2010/02/03 08:32:29 | at org.apache.coyote.http11.InternalOutputBuffer.doWrite(InternalOutputBuffer.java:570)
INFO | jvm 1 | 2010/02/03 08:32:29 | at org.apache.coyote.Response.doWrite(Response.java:560)
INFO | jvm 1 | 2010/02/03 08:32:29 | at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:353)
INFO | jvm 1 | 2010/02/03 08:32:29 | at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:434)
INFO | jvm 1 | 2010/02/03 08:32:29 | at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:349)
INFO | jvm 1 | 2010/02/03 08:32:29 | at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:381)
INFO | jvm 1 | 2010/02/03 08:32:29 | at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:370)
INFO | jvm 1 | 2010/02/03 08:32:29 | at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:89)
INFO | jvm 1 | 2010/02/03 08:32:29 | at java.util.zip.DeflaterOutputStream.deflate(DeflaterOutputStream.java:156)
INFO | jvm 1 | 2010/02/03 08:32:29 | at java.util.zip.DeflaterOutputStream.write(DeflaterOutputStream.java:114)
INFO | jvm 1 | 2010/02/03 08:32:29 | at java.util.zip.ZipOutputStream.write(ZipOutputStream.java:259)
INFO | jvm 1 | 2010/02/03 08:32:29 | at sun.nio.cs.StreamEncoder$CharsetSE.writeBytes(StreamEncoder.java:336)
INFO | jvm 1 | 2010/02/03 08:32:29 | at sun.nio.cs.StreamEncoder$CharsetSE.implWrite(StreamEncoder.java:395)
INFO | jvm 1 | 2010/02/03 08:32:29 | at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:136)
INFO | jvm 1 | 2010/02/03 08:32:29 | at java.io.OutputStreamWriter.write(OutputStreamWriter.java:191)
INFO | jvm 1 | 2010/02/03 08:32:29 | at java.io.BufferedWriter.flushBuffer(BufferedWriter.java:111)
INFO | jvm 1 | 2010/02/03 08:32:29 | at java.io.BufferedWriter.write(BufferedWriter.java:212)
INFO | jvm 1 | 2010/02/03 08:32:29 | at java.io.Writer.write(Writer.java:126)
INFO | jvm 1 | 2010/02/03 08:32:29 | at com.nit.tim.shared.xml.output.XmlOutput.output(XmlOutput.java:111)
INFO | jvm 1 | 2010/02/03 08:32:29 | at com.nit.tim.shared.io.ItemDownloadDoc.add(ItemDownloadDoc.java:150)
INFO | jvm 1 | 2010/02/03 08:32:29 | at com.nit.tim.webclient.action.DownloadResultsAction.execute(DownloadResultsAction.java:126)


Now the question is why does it happen for bigger downloads and not for smaller downloads? And What should be done to avoid this error?
Any inputs will be highly appreciated !
Best Regards,
Nitin

[Rob Spoor]

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