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POHow to use Spring RestTemplate and JAXB marshalling on a URL that returns multiple types of XML
 

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  1. POHow to use Spring RestTemplate and JAXB marshalling on a URL that returns multiple types of XML
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    <p>I need to make a Rest POST to a service that returns either a <code>&lt;job/&gt;</code> or an <code>&lt;exception/&gt;</code> and always status code <code>200</code>. (lame 3rd party product!).</p> <p>I have code like:</p> <pre><code>Job job = getRestTemplate().postForObject(url, postData, Job.class); </code></pre> <p>And my applicationContext.xml looks like: </p> <pre><code>&lt;bean id="restTemplate" class="org.springframework.web.client.RestTemplate"&gt; &lt;constructor-arg ref="httpClientFactory"/&gt; &lt;property name="messageConverters"&gt; &lt;list&gt; &lt;bean class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter"&gt; &lt;property name="marshaller" ref="jaxbMarshaller"/&gt; &lt;property name="unmarshaller" ref="jaxbMarshaller"/&gt; &lt;/bean&gt; &lt;bean class="org.springframework.http.converter.FormHttpMessageConverter"/&gt; &lt;bean class="org.springframework.http.converter.StringHttpMessageConverter"/&gt; &lt;/list&gt; &lt;/property&gt; &lt;/bean&gt; &lt;bean id="jaxbMarshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller"&gt; &lt;property name="classesToBeBound"&gt; &lt;list&gt; &lt;value&gt;domain.fullspec.Job&lt;/value&gt; &lt;value&gt;domain.fullspec.Exception&lt;/value&gt; &lt;/list&gt; &lt;/property&gt; &lt;/bean&gt; </code></pre> <p>When I try to make this call and the service fails, I get: </p> <pre><code> Failed to convert value of type 'domain.fullspec.Exception' to required type 'domain.fullspec.Job' </code></pre> <p>In the postForObject() call, I am asking for a Job.class and not getting one and it is getting upset.</p> <p>I am thinking I need to be able to do something along the lines of: </p> <pre><code>Object o = getRestTemplate().postForObject(url, postData, Object.class); if (o instanceof Job.class) { ... else if (o instanceof Exception.class) { } </code></pre> <p>But this doesnt work because then JAXB complains that it doesnt know how to marshal to Object.class - not surprisingly.</p> <p>I have attempted to create subclass of MarshallingHttpMessageConverter and override readFromSource()</p> <p>protected Object readFromSource(Class clazz, HttpHeaders headers, Source source) {</p> <pre><code> Object o = null; try { o = super.readFromSource(clazz, headers, source); } catch (Exception e) { try { o = super.readFromSource(MyCustomException.class, headers, source); } catch (IOException e1) { log.info("Failed readFromSource "+e); } } return o; } </code></pre> <p>Unfortunately, this doesnt work because the underlying inputstream inside source has been closed by the time I retry it.</p> <p>Any suggestions gratefully received, </p> <p>Tom</p> <p><strong>UPDATE: I have got this to work by taking a copy of the inputStream</strong></p> <pre><code>protected Object readFromSource(Class&lt;?&gt; clazz, HttpHeaders headers, Source source) { InputStream is = ((StreamSource) source).getInputStream(); // Take a copy of the input stream so we can use it for initial JAXB conversion // and if that fails, we can try to convert to Exception CopyInputStream copyInputStream = new CopyInputStream(is); // input stream in source is empty now, so reset using copy ((StreamSource) source).setInputStream(copyInputStream.getCopy()); Object o = null; try { o = super.readFromSource(clazz, headers, source); // we have failed to unmarshal to 'clazz' - assume it is &lt;exception&gt; and unmarshal to MyCustomException } catch (Exception e) { try { // reset input stream using copy ((StreamSource) source).setInputStream(copyInputStream.getCopy()); o = super.readFromSource(MyCustomException.class, headers, source); } catch (IOException e1) { e1.printStackTrace(); } e.printStackTrace(); } return o; } </code></pre> <p>CopyInputStream is taken from <a href="http://www.velocityreviews.com/forums/t143479-how-to-make-a-copy-of-inputstream-object.html">http://www.velocityreviews.com/forums/t143479-how-to-make-a-copy-of-inputstream-object.html</a>, i'll paste it here.</p> <pre><code>import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; public class CopyInputStream { private InputStream _is; private ByteArrayOutputStream _copy = new ByteArrayOutputStream(); /** * */ public CopyInputStream(InputStream is) { _is = is; try { copy(); } catch(IOException ex) { // do nothing } } private int copy() throws IOException { int read = 0; int chunk = 0; byte[] data = new byte[256]; while(-1 != (chunk = _is.read(data))) { read += data.length; _copy.write(data, 0, chunk); } return read; } public InputStream getCopy() { return (InputStream)new ByteArrayInputStream(_copy.toByteArray()); } } </code></pre>
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    1. COThe call on how to handle conversion should be handled in a layer prior to this. What about implementing a custom MessageConverter that could handle, invoke correct conversion module based on the result data.
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    2. COI have actually been trying something like that but no joy so far - i'll update question with what I have bee trying.
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