Posted on 2010-10-05 00:39
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Drools
java.lang.NullPointerException
at jxl.read.biff.File.<init>(File.java:77)
at jxl.Workbook.getWorkbook(Workbook.java:250)
at jxl.Workbook.getWorkbook(Workbook.java:235)
at org.drools.decisiontable.parser.xls.ExcelParser.parseFile(ExcelParser.java:76)
at org.drools.decisiontable.SpreadsheetCompiler.compile(SpreadsheetCompiler.java:89)
at org.drools.decisiontable.SpreadsheetCompiler.compile(SpreadsheetCompiler.java:68)
at com.sample.DecisionTableTest.readDecisionTable(DecisionTableTest.java:59)
at com.sample.DecisionTableTest.main(DecisionTableTest.java:36)
Drools调用readDecisionTable()方法里面一处为：
InputStream is = DecisionTableTest.class.getResourceAsStream("rules\\Sample.xls");
final String drl = converter.compile( is, InputType.XLS );
需改为如下，取的class即错误解决。
InputStream is = DecisionTableTest.class.getClassLoader().getResourceAsStream("rules\\Sample.xls");
final String drl = converter.compile( is, InputType.XLS );