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    <p>The problem is that your JAX-RS implementation (Jersey in this case) doesn't know how to map <code>application/json</code> content into a <code>String</code>. You'll need to register a <code>MessageBodyReader&lt;String&gt;</code> implementation that is annotated with <code>@Consumes(MediaType.APPLICATION_JSON)</code>.</p> <p><strong>Addendum</strong></p> <p>Implementing a <code>MessageBodyReader</code> that converts to <code>String</code> is straightforward.</p> <pre><code>@Provider @Consumes(MediaType.APPLICATION_JSON) public class JsonStringReader implements MessageBodyReader&lt;String&gt; { @Override public boolean isReadable( Class&lt;?&gt; type, Type genericType, Annotation[] annotations, MediaType mediaType ) {return type == String.class;} @Override public String readFrom( Class&lt;String&gt; type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap&lt;String, String&gt; httpHeaders, InputStream entityStream ) throws IOException, WebApplicationException { final String charsetName = mediaType.getParameters().get(MediaType.CHARSET_PARAMETER); final Charset charset = charsetName == null ? Charset.forName("UTF-8") : Charset.forName(charsetName); final StringBuilder builder = new StringBuilder(); final Reader reader = new InputStreamReader(entityStream, charset); final CharBuffer buffer = CharBuffer.allocate(1024); while (reader.read(buffer) != -1) { buffer.flip(); builder.append(buffer); buffer.clear(); } return builder.toString(); } } </code></pre> <p>There are several ways to register a entity provider with a JAX-RS implementation. The way that's probably easier with Jersey is to add the following to your <code>web.xml</code>:</p> <pre><code>&lt;init-param&gt; &lt;param-name&gt;com.sun.jersey.config.property.packages&lt;/param-name&gt; &lt;param-value&gt;pkg.that.contains.the.messagereader&lt;/param-value&gt; &lt;/init-param&gt; </code></pre> <p>Further information on creating entity providers for Jersey can be found here: <a href="https://jersey.java.net/documentation/latest/message-body-workers.html" rel="nofollow">https://jersey.java.net/documentation/latest/message-body-workers.html</a></p> <p>More information on configuring Jersey can be found here: <a href="http://jersey.java.net/nonav/apidocs/1.8/jersey/com/sun/jersey/spi/container/servlet/ServletContainer.html" rel="nofollow">http://jersey.java.net/nonav/apidocs/1.8/jersey/com/sun/jersey/spi/container/servlet/ServletContainer.html</a></p>
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    1. POJson to string in Jersey
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    1. COCould you show me how to do that?
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    2. COOn a stylistic note, having a resource called "file/save" that you only POST to is not truly RESTful. In true RESTful style, you might have a resource named "files" from which GET returns a list of existing content URI's, and from which POST adds a new resource and returns its URI via an HTTP 201 Created response.
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