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java.lang.NullPointerException: 	at org.apache.xpath.objects.XNodeSet.getStringFromNode(XNodeSet.java:255)	at org.apache.xpath.objects.XNodeSet.str(XNodeSet.java:318)	at org.apache.xpath.functions.FuncContains.execute(FuncContains.java:87)	at org.apache.xpath.functions.FuncNot.execute(FuncNot.java:85)	at org.apache.xpath.Expression.bool(Expression.java:230)	at org.apache.xpath.XPath.bool(XPath.java:383)	at org.apache.xalan.templates.ElemIf.execute(ElemIf.java:208)	at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2339)	at org.apache.xalan.templates.ElemIf.execute(ElemIf.java:210)	at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2339)	at org.apache.xalan.templates.ElemTemplate.execute(ElemTemplate.java:435)	at org.apache.xalan.templates.ElemCallTemplate.execute(ElemCallTemplate.java:273)	at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:425)	at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:216)	at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2339)	at org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:710)	at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes(ElemApplyTemplates.java:425)	at org.apache.xalan.templates.ElemApplyTemplates.execute(ElemApplyTemplates.java:216)	at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2339)	at org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(TransformerImpl.java:2160)	at org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1213)	at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:668)	at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1129)	at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1107)	at my.companies.product.validation.impl.MeldingValidationServiceSAXImpl.validate(MeldingValidationServiceSAXImpl.java:89)