Seeing the template .drl would help to resolve this. Are all @{parameter}s declared in the template header?<br>-W<br><br><div class="gmail_quote">2010/11/9 Roger Smith <span dir="ltr"><<a href="mailto:rogersmith1711@gmail.com">rogersmith1711@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div> </div>
<div><span style="font-family: 'Times New Roman','serif'; font-size: 12pt;">All - </span></div>
<div><span style="font-family: 'Times New Roman','serif'; font-size: 12pt;"></span> </div>
<div><span style="font-family: 'Times New Roman','serif'; font-size: 12pt;">I tried out Drools rule template with a </span><span style="font-family: 'Times New Roman','serif'; font-size: 12pt;">with a proptotype app. Drools is throwing NullPointerException as below. I would much appreciate if someone on this list can help. </span></div>
<div><span style="font-family: 'Times New Roman','serif'; font-size: 12pt;"><br>java.lang.NullPointerException<br> at org.drools.template.parser.DefaultTemplateColumn.createCellCondition(DefaultTemplateColumn.java:68)<br>
at org.drools.template.parser.DefaultTemplateColumn.addCondition(DefaultTemplateColumn.java:91)<br> at org.drools.template.parser.DefaultTemplateRuleBase.createColumnConditions(DefaultTemplateRuleBase.java:105)<br>
at org.drools.template.parser.DefaultTemplateRuleBase.createTemplateRule(DefaultTemplateRuleBase.java:98)<br> at org.drools.template.parser.DefaultTemplateRuleBase.getDTRules(DefaultTemplateRuleBase.java:85)<br> at org.drools.template.parser.DefaultTemplateRuleBase.<init>(DefaultTemplateRuleBase.java:64)<br>
at org.drools.template.parser.TemplateDataListener.<init>(TemplateDataListener.java:76)<br> at org.drools.template.parser.TemplateDataListener.<init>(TemplateDataListener.java:52)<br> at org.drools.template.ObjectDataCompiler.compile(ObjectDataCompiler.java:44)<br>
</span></div>
<div><span style="font-family: 'Times New Roman','serif'; font-size: 12pt;"></span> </div>
<div><span style="font-family: 'Times New Roman','serif'; font-size: 12pt;">Here is my code <br><br> KnowledgeBuilder kBuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();<br> ObjectDataCompiler converter = new ObjectDataCompiler();<br>
InputStream dis = new FileInputStream( new File( "/home/pranab/Projects/gridx/ct11_1.drl" ) );<br> if (null == dis){<br> System.out.println("null rule template stream");<br> return;<br>
}<br><br> Collection<Map<String,Object>> paramMaps = new ArrayList<Map<String,Object>>();<br><br> Map<String,Object> params = new HashMap<String,Object>();<br><br>
params.put("summerOnPeakPrimaryRate", new Integer(299));<br> params.put("summerOnPeakSecondaryRate", new Integer(524));<br> params.put("summerSemiPeakPrimaryRate", new Integer(176));<br>
params.put("summerSemiPeakSecondaryRate", new Integer(305));<br> params.put("summerOffPeakPrimaryRate", new Integer(139));<br> params.put("summerOffPeakSecondaryRate", new Integer(243));<br>
params.put("winterOnPeakPrimaryRate", new Integer(249));<br> params.put("winterOnPeakSecondaryRate", new Integer(438));<br> params.put("winterSemiPeakPrimaryRate", new Integer(176));<br>
params.put("winterSemiPeakSecondaryRate", new Integer(305));<br> params.put("winterOffPeakPrimaryRate", new Integer(139));<br> params.put("winterOffPeakSecondaryRate", new Integer(243));<br>
paramMaps.add(params);<br><br> <span style="color: rgb(0, 0, 153);">String drl = converter.compile(paramMaps, dis);</span><br> Reader rdr = new StringReader( drl );<br> kBuilder.add( ResourceFactory.newReaderResource(rdr), ResourceType.DRL);<br>
<br><br>The line in blue is throwing the exception. This code is very similar to the example code in Drools Expert guide.</span></div>
<div><span style="font-family: 'Times New Roman','serif'; font-size: 12pt;"></span> </div>
<div><span style="font-family: 'Times New Roman','serif'; font-size: 12pt;">Best, </span></div>
<div><span style="font-family: 'Times New Roman','serif'; font-size: 12pt;"></span> </div><font color="#888888">
<div><span style="font-family: 'Times New Roman','serif'; font-size: 12pt;">Roger</span><span style="font-family: 'Times New Roman','serif'; font-size: 12pt;"></span></div>
<div><br> </div>
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<br></blockquote></div><br>