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POasynccallback failures
 

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    <p>In my app I need to add string vallues to the file(.property file, if it is important). and user enter this values in gwt GUI. Here is it's important part:</p> <pre><code>final Button submit = new Button("Submit"); addButton(submit); submit.addSelectionListener(new SelectionListener&lt;ButtonEvent&gt;() { @Override public void componentSelected(ButtonEvent ce) { keyWord.selectAll(); regexp.selectAll(); if (keyWord.getValue() != null){ setKeyWord(customerId, keyWord.getValue()); keyWord.setValue(""); } if (regexp.getValue() != null){ setRegExp(customerId, regexp.getValue()); regexp.setValue(""); } } }); } private void setKeyWord(final String customerId, final String keyword){ final AsyncCallback&lt;String&gt; callbackItems = new AsyncCallback&lt;String&gt;() { public void onFailure(final Throwable caught) { Window.alert("unable to add " + caught.toString()); } public void onSuccess(final String x) { Window.alert(x); } }; serverManagementSvc.setKeyWords(customerId, keyword, callbackItems); } private void setRegExp(final String customerId, final String regexp){ final AsyncCallback&lt;String&gt; calbackItems = new AsyncCallback&lt;String&gt;() { @Override public void onFailure(Throwable throwable) { Window.alert("unable to add " + throwable.toString()); } @Override public void onSuccess(String s) { Window.alert(s); } }; serverManagementSvc.setRegExp(customerId, regexp, calbackItems); } </code></pre> <p>So I need to use Asunccallback to call methods which are in the "server part". here are these methods:</p> <pre><code>//adds a new keyword to customers properties public String setKeyWords(String customer, String word){ try{ PropertiesConfiguration props = new PropertiesConfiguration("/home/mikhail/bzrrep/DLP/DLPServer/src/main/resources/rules.properties"); String newKeyWord = new String(props.getString("users." + customer + ".keywords" + "," + word)); props.setProperty("users." + customer + ".keywords", newKeyWord); props.save(); }catch (ConfigurationException e){ e.printStackTrace(); } return "keyword " + word + " added"; } // adds a new regexp to customer properties public String setRegExp(String customer, String regexp){ try { PropertiesConfiguration props = new PropertiesConfiguration("/home/mikhail/bzrrep/DLP/DLPServer/src/main/resources/rules.properties"); String newRegValue = new String(props.getString("users." + customer + ".regexps" + "," + regexp)); props.setProperty("users." + customer + ".regexps", newRegValue); props.save(); } catch (ConfigurationException e){ e.printStackTrace(); } return "regexp " + regexp + " added to " + customer + "'s config"; } </code></pre> <p>all interfaces are present. when I run my code And press "submit" button in gui I see that both asynccallback failured(Window.alert, as you can see, shows "null pointer exception" despite of the fact that values which I send to methods are not null). why can it be? can you suggest me something?</p> <p><strong>UPD</strong> here is error which is shown by firebug:</p> <pre><code>uncaught exception: java.lang.ClassCastException function W8(){try{null.a()}catch(a){return a}} </code></pre>
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    1. USNikitin Mikhail
    1. USNikitin Mikhail
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    1. CODoes the server receive the requests? What about the server log?
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    2. COActually, I'm a newby in programming, and can't say this because don't know how. only firebug in firefox shows that the Post has appropriate values and one error, which I can't understand what is. I'll update my post now
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      1. USNikitin Mikhail
 

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