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POjava- unable to map object returned by query to correctly defined class
 

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  1. POjava- unable to map object returned by query to correctly defined class
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    <p>I have a requirement where some data has to be obtained by connecting to an API.</p> <p>I have mapped the object returned by query to a hashmap, using the following code--</p> <pre><code> untypedResult=wt.QueryPermissions(); resp.getWriter().println(" Response for QueryPermissions----"); if(wt.errormsg=="No Error") { hMap = (HashMap&lt;String, Integer&gt;) untypedResult; Set set = hMap.entrySet(); Iterator i = set.iterator(); while(i.hasNext()){ Map.Entry me = (Map.Entry)i.next(); resp.getWriter().println(me.getKey() + " : " + me.getValue()); </code></pre> <p>The output as returned by using above code --</p> <pre><code> Response for QueryPermissions---- get_all_words_popularity : {keyphrase_limit=999, timeout_limit=99, cost_per_call=99, result_limit=999} </code></pre> <p>Now I tried to map the response (in object) to the following class---</p> <pre><code>public class wt_queryperm_class { public Integer keyphrase_limit; public Integer timeout_limit; public Integer cost_per_call; public Integer result_limit; } </code></pre> <p>Also, now I modified the code used to display the data as shown below--</p> <pre><code> //declare new object to store result of QueryPermissions wt_queryperm_class a; untypedResult=wt.QueryPermissions(); resp.getWriter().println(" Response for QueryPermissions----"); if(wt.errormsg=="No Error") { hMap = (HashMap&lt;String, Integer&gt;) untypedResult; Set set = hMap.entrySet(); Iterator i = set.iterator(); while(i.hasNext()){ Map.Entry me = (Map.Entry)i.next(); a= (wt_queryperm_class)(me.getValue()); resp.getWriter().println(me.getKey() + " : Cost per call=" + a.cost_per_call + "Keyphrase limit=" + a.keyphrase_limit + " Result limit=" + a.result_limit +" Timeout limit=" + a.timeout_limit ); } </code></pre> <p>However I get the following error when I run the above code--</p> <pre><code>Problem accessing /keywords_trial_application. Reason: java.util.HashMap cannot be cast to com.taurusseo.keywords.wt_queryperm_class Caused by: java.lang.ClassCastException: java.util.HashMap cannot be cast to com.taurusseo.keywords.wt_queryperm_class </code></pre> <p>What am I doing wrong here? How do I cast the response correctly so that I can extract each of the 4 values correctly?</p>
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    1. USArvind
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