I am converting an EDI file to XML. However my input file which happens to also be in BIF is approximately 100Mb is giving me a JAVA out of memory error.
I tried to consult Smook's Documentation for the huge file conversion, however it is a conversion from XML to EDI.
Below is the response I am getting when running my main
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Arrays.java:3332)
at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:124)
at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:596)
at java.lang.StringBuffer.append(StringBuffer.java:367)
at java.io.StringWriter.write(StringWriter.java:94)
at java.io.Writer.write(Writer.java:127)
at freemarker.core.TextBlock.accept(TextBlock.java:56)
at freemarker.core.Environment.visit(Environment.java:257)
at freemarker.core.MixedContent.accept(MixedContent.java:57)
at freemarker.core.Environment.visitByHiddingParent(Environment.java:278)
at freemarker.core.IteratorBlock$Context.runLoop(IteratorBlock.java:157)
at freemarker.core.Environment.visitIteratorBlock(Environment.java:501)
at freemarker.core.IteratorBlock.accept(IteratorBlock.java:67)
at freemarker.core.Environment.visit(Environment.java:257)
at freemarker.core.Macro$Context.runMacro(Macro.java:173)
at freemarker.core.Environment.visit(Environment.java:686)
at freemarker.core.UnifiedCall.accept(UnifiedCall.java:80)
at freemarker.core.Environment.visit(Environment.java:257)
at freemarker.core.MixedContent.accept(MixedContent.java:57)
at freemarker.core.Environment.visit(Environment.java:257)
at freemarker.core.Environment.process(Environment.java:235)
at freemarker.template.Template.process(Template.java:262)
at org.milyn.util.FreeMarkerTemplate.apply(FreeMarkerTemplate.java:92)
at org.milyn.util.FreeMarkerTemplate.apply(FreeMarkerTemplate.java:86)
at org.milyn.event.report.HtmlReportGenerator.applyTemplate(HtmlReportGenerator.java:76)
at org.milyn.event.report.AbstractReportGenerator.processFinishEvent(AbstractReportGenerator.java:197)
at org.milyn.event.report.AbstractReportGenerator.processLifecycleEvent(AbstractReportGenerator.java:157)
at org.milyn.event.report.AbstractReportGenerator.onEvent(AbstractReportGenerator.java:92)
at org.milyn.Smooks._filter(Smooks.java:558)
at org.milyn.Smooks.filterSource(Smooks.java:482)
at com.***.xfunctional.EdiToXml.runSmooksTransform(EdiToXml.java:40)
at com.***.xfunctional.EdiToXml.main(EdiToXml.java:57)
import java.io.*;
import java.util.Arrays;
import java.util.Locale;
import javax.xml.transform.stream.StreamSource;
import org.milyn.Smooks;
import org.milyn.SmooksException;
import org.milyn.container.ExecutionContext;
import org.milyn.event.report.HtmlReportGenerator;
import org.milyn.io.StreamUtils;
import org.milyn.payload.StringResult;
import org.milyn.payload.SystemOutResult;
import org.xml.sax.SAXException;
public class EdiToXml {
private static byte[] messageIn = readInputMessage();
protected static String runSmooksTransform() throws IOException, SAXException, SmooksException {
Locale defaultLocale = Locale.getDefault();
Locale.setDefault(new Locale("en", "EN"));
// Instantiate Smooks with the config...
Smooks smooks = new Smooks("smooks-config.xml");
try {
// Create an exec context - no profiles....
ExecutionContext executionContext = smooks.createExecutionContext();
StringResult result = new StringResult();
// Configure the execution context to generate a report...
executionContext.setEventListener(new HtmlReportGenerator("target/report/report.html"));
// Filter the input message to the outputWriter, using the execution context...
smooks.filterSource(executionContext, new StreamSource(new ByteArrayInputStream(messageIn)),result);
Locale.setDefault(defaultLocale);
return result.getResult();
} finally {
smooks.close();
}
}
public static void main(String[] args) throws IOException, SAXException, SmooksException {
System.out.println("\n\n==============Message In==============");
System.out.println("======================================\n");
pause(
"The EDI input stream can be seen above. Press 'enter' to see this stream transformed into XML...");
String messageOut = EdiToXml.runSmooksTransform();
System.out.println("==============Message Out=============");
System.out.println(messageOut);
System.out.println("======================================\n\n");
pause("And that's it! Press 'enter' to finish...");
}
private static byte[] readInputMessage() {
try {
InputStream input = new BufferedInputStream(new FileInputStream("/home/****/Downloads/BifInputFile.DATA"));
return StreamUtils.readStream(input);
} catch (IOException e) {
e.printStackTrace();
return "<no-message/>".getBytes();
}
}
private static void pause(String message) {
try {
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.print("> " message);
in.readLine();
} catch (IOException e) {
}
System.out.println("\n");
}
}
<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd" xmlns:edi="http://www.milyn.org/xsd/smooks/edi-1.4.xsd">
<!--
Configure the EDI Reader to parse the message stream into a stream of SAX events.
-->
<edi:reader mappingModel="edi-to-xml-bif-mapping.xml" validate="false"/>
</smooks-resource-list>
I edited this line in the code to reflect the usage of a stream :-
smooks.filterSource(executionContext, new StreamSource(new FileInputStream("/home/***/Downloads/sample-text-file.txt")), result);
However I now have this below as error. Anybody any guess what is the best approach ?
Exception in thread "main" org.milyn.SmooksException: Failed to filter source.
at org.milyn.delivery.sax.SmooksSAXFilter.doFilter(SmooksSAXFilter.java:97)
at org.milyn.delivery.sax.SmooksSAXFilter.doFilter(SmooksSAXFilter.java:64)
at org.milyn.Smooks._filter(Smooks.java:526)
at org.milyn.Smooks.filterSource(Smooks.java:482)
at ****.EdiToXml.runSmooksTransform(EdiToXml.java:41)
at com.***.***.EdiToXml.main(EdiToXml.java:58)
Caused by: org.milyn.edisax.EDIParseException: EDI message processing failed [EDIFACT-BIF-TO-XML][1.0]. Must be a minimum of 1 instances of segment [UNH]. Currently at segment number 1.
at org.milyn.edisax.EDIParser.mapSegments(EDIParser.java:504)
at org.milyn.edisax.EDIParser.mapSegments(EDIParser.java:453)
at org.milyn.edisax.EDIParser.parse(EDIParser.java:428)
at org.milyn.edisax.EDIParser.parse(EDIParser.java:386)
at org.milyn.smooks.edi.EDIReader.parse(EDIReader.java:111)
at org.milyn.delivery.sax.SAXParser.parse(SAXParser.java:76)
at org.milyn.delivery.sax.SmooksSAXFilter.doFilter(SmooksSAXFilter.java:86)
... 5 more
CodePudding user response：
The message was valid and the xml mapping was good. I was just not using the optimal method for message reading and writing.
I came to realize the filterSource method of Smooks can directly be fed with an InputStream & OutputStream as variables. Kindly find below the piece of code that led to an efficient running of the program without going through JAVA memory error.
//Instantiate a FileInputStream
FileInputStream inputStream = new FileInputStream(inputFileName);
//Instantiate an FileOutputStream
FileOutputStream outputStream = new FileOutputStream(outputFileName);
try {
// Filter the input message to the outputWriter...
smooks.filterSource(new StreamSource(inputStream), new StreamResult(outputStream));
Locale.setDefault(defaultLocale);
} finally {
smooks.close();
inputStream.close();
outputStream.close();
}
Thanks to the community.
Regards.