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Please use a "search.query.parameter.name" contextual property to indicate to the runtime that a $filter query option need to be checked for the query expression and a "search.parser" property to point to the instance of org.apache.cxf.jaxrs.ext.search.odata.ODataParser, as shown in this test, see the startServers function.

And here is also an XML Spring configuration example (using SearchBean in this specific case):

 <cxf:bus>
  <cxf:properties>
    <entry key="search.query.parameter.name" value="$filter" />
    <entry key="search.parser">
      <bean class="org.apache.cxf.jaxrs.ext.search.odata.ODataParser">
         <constructor-arg value="#{ T(org.apache.cxf.jaxrs.ext.search.SearchBean) }" />
      </bean>
    </entry>
  </cxf:properties>
</cxf:bus>
 

Also note that Apache Olingo offers its own visitor model which can be used to work with JPA2, etc.

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