How can I improve JAXB performance?

Question

Here is my conversion code. This is taking long time when we are dealing with large data... Calling the method almost a million times... We could clearly see that it is holding threads for a while.

Please suggest me some ways to improve the performance!

public class GenericObjectXMLConverter<T> { private T t = null; private static JAXBContext jaxbContext =null; public GenericObjectXMLConverter() { } public GenericObjectXMLConverter(T obj){ t = obj; } protected final Logger log = Logger.getLogger(getClass()); /** * Converts the java Object and into a xml string message type. * @param object the object to convert * @return String the converted xml message as string */ public String objectToXMLMessage(T object) { StringWriter stringWriter = new StringWriter(); //JAXBContext jaxbContext=null; try { jaxbContext = JAXBContext.newInstance(object.getClass()); Marshaller jaxbMarshaller = jaxbContext.createMarshaller(); jaxbMarshaller.marshal(object, stringWriter); } catch (JAXBException e) { log.warn("JAXBException occured while converting the java object into xml string :"+e.getMessage()); } /*if(log.isDebugEnabled()) log.debug("xml string after conversion:"+stringWriter.toString());*/ return stringWriter.toString(); } /** * Converts a xml string message into a Java Object * @param string the string message to convert * @return Object the result as Java Object. If the message parameter is null then * this method will simply return null. */ @SuppressWarnings("unchecked") public T xmlToObject(String message) { if(message.equals("") || message.equals(" ") || message.length()==0){ return null; }else{ T object=null; try { jaxbContext = JAXBContext.newInstance(t.getClass()); StringReader reader = new StringReader(message); Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller(); object = (T)jaxbUnmarshaller.unmarshal(reader); } catch (JAXBException e) { log.warn("JAXBException occured while converting the xml string into a Java Object :"+e.getMessage()); } /* if(log.isDebugEnabled()){ log.debug("Java object after conversion:"+object.toString()); }*/ return object; } } }

You don't need to create a new marshaller/unmarshaller on each method call. Try "caching" these and see if the performance improves. I have the feeling that the marshaller will cache the class metadata when it's serializing or deserializing. — Augusto
– Augusto, Commented Sep 4, 2013 at 7:04
But the object I am passing are different in each time right ? So how it works ? Can you please elaborate how caching can be done .. — Shak
– Shak, Commented Sep 4, 2013 at 7:11
It will be great if you can provide me some samples Thanks in Advance — Shak
– Shak, Commented Sep 4, 2013 at 7:12
The object instance might be different, but the class will probably be the same. I would be really surprised if you have a million different classes in your project :) - stackoverflow.com/questions/1215881/…. — Augusto
– Augusto, Commented Sep 4, 2013 at 7:13

bdoughan · Accepted Answer · 2013-09-04 09:43:56Z

Performance and JAXB Runtime Classes

You should avoid creating the same JAXBContext over and over. JAXBContext is thread safe and should be reused to improve performance.
Marshaller/Unmarshaller are not thread safe, but are quick to create. It's not as big a deal to reuse them.

Nitin · Accepted Answer · 2018-04-10 05:09:51Z

You should create single JAXBContext object per your bean class. Here is my version to maintain singleton object of JAXBContext per bean class.

public class MyJAXBUtil { public static final Map<String, JAXBContext> JAXB_MAP = new HashMap<>(); public static JAXBContext getJAXBContext(Object object) { if(JAXB_MAP.get(object.getClass().getCanonicalName()) != null) { return JAXB_MAP.get(object.getClass().getCanonicalName()); }else { try { JAXBContext jaxbContext = JAXBContext.newInstance(object.getClass()); JAXB_MAP.put(object.getClass().getCanonicalName(), jaxbContext); return jaxbContext; } catch (JAXBException e) { e.printStackTrace(); return null; } } } }

You can call getJAXBContext method when you need JAXBContext of your bean class and create Marshaller/Unmarshaller locally.

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