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POcatch exception in JSP
 

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  1. POcatch exception in JSP
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    <p>I want to know how to handle this situation and what do you recommend for this. </p> <p>I am having a null pointer exception in my JSP. </p> <pre><code>String csvDataIn = new String ((String)request.getAttribute("csvString")); </code></pre> <p>This is because, I have created a Controller in spring in order to handle the querying to the DB and get a csvString. Everything is working fine, until I made a query that is failing. </p> <p>So, in the controller:</p> <pre><code> ... JsonNode json = dataRepository.getDataAsJson(dataNode); csvString = getCSVfromJsonNode(json); model.addAttribute("csvString", csvString); } catch (Exception e) { Logger.log("CSV controller failed", _moduleClass, e); } return "exportCSV"; } </code></pre> <p>So the variable json is never been fill it, because the function getDataAsJson() is failing. So this is throwing an exception. And then I am returning back to the exportCSV.jsp, but I am not returning the attribute csvString in the model.</p> <p>So, back in the jsp, is throwing the nullpointer exception.</p> <p>So my questions are: a- How you will catch this exceptions in the JSP? b- Do you think a better solution, than catch the exception in the JSP? I mean what could be the best practice for this.</p> <p>Thanks in advance.</p> <p>Thanks for the responses. They are really good help: I made the following modifications in order to handle the problem. </p> <pre><code> ... JsonNode json = dataRepository.getDataAsJson(dataNode); model.addAttribute("csvString", csvString); } catch (Exception e) { Logger.log("CSV controller failed", _moduleClass, e); } return "exportCSV"; csvString = getCSVfromJsonNode(json); } </code></pre> <p>This solve the problem for sending a Null String, since the csvString is bean created before, empty.</p> <p>The exception that I am getting in here is javax.xml.ws.webserviceexception could not send message (do you know a better way to handle this at the controller?)</p> <p>I also did this in the jsp side, just in case:</p> <pre><code>String csvDataIn = (String)request.getAttribute("csvString"); //This should never happen, but we check anyway. if (csvDataIn != null){ ... } </code></pre> <p>So the only doubt that I may remain is: do you know a better way to handle javax.xml.ws.webserviceexception at the controller?</p> <p>THANKS AGAIN</p>
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    1. USJuano7894
    1. USJuano7894
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    1. COThe exception handling like what you're talking about belongs in the controller.
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      1. USMarvo
 

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