NullPointerException when attempt to process xlsx file ------------------------------------------------------ Key: DROOLS-957 URL: https://issues.jboss.org/browse/DROOLS-957 Project: Drools Issue Type: Bug Components: core engine, decision tables Affects Versions: 6.3.0.Final Environment: Java 1.7.0_67 Reporter: Artsiom Tsaryonau Assignee: Mario Fusco Attachments: ref_table.xls, ref_table.xlsx When I try to process _xls_ table (in the attachment) - in order to check its validity - it's works fine and shows that table is incorrect. But when I try to process the same table but in _xlsx_ I get +NullPointerException+ {code:c} java.lang.NullPointerException at org.apache.poi.openxml4j.opc.OPCPackage.getPart(OPCPackage.java:628) at org.apache.poi.POIXMLDocumentPart.<init>(POIXMLDocumentPart.java:97) at org.apache.poi.POIXMLDocument.<init>(POIXMLDocument.java:57) at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:197) at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:79) at org.drools.decisiontable.parser.xls.ExcelParser.parseFile(ExcelParser.java:82) at org.drools.decisiontable.SpreadsheetCompiler.compile(SpreadsheetCompiler.java:93) at org.drools.decisiontable.SpreadsheetCompiler.compile(SpreadsheetCompiler.java:72) at org.drools.decisiontable.DecisionTableProviderImpl.compileStream(DecisionTableProviderImpl.java:75) at org.drools.decisiontable.DecisionTableProviderImpl.loadFromInputStream(DecisionTableProviderImpl.java:43) at org.drools.compiler.compiler.DecisionTableFactory.loadFromInputStream(DecisionTableFactory.java:32) at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.decisionTableToPackageDescr(KnowledgeBuilderImpl.java:402) at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.addPackageFromDecisionTable(KnowledgeBuilderImpl.java:372) at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.addKnowledgeResource(KnowledgeBuilderImpl.java:732) at org.drools.compiler.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:2223) at com.xxxx.xxxx.RuleValidator.isValidXLSRule(RuleValidator.java:33) at com.xxxx.xxxx.RuleValidator.main(RuleValidator.java:26) {code} Also it can be possible that there is an error in my application's code - maybe I am doing something wrong. I additionally add that _xlsx_ table is not purely _xlsx_ table created in excel, but converted from _xls_ using excel.