java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at myGroup.sv.hibernate.HibernateDBServerInstance.getSystemSession(Unknown Source)
at myGroup.sv.hibernate.HibernateDBServerInstance.getSystemSession(Unknown Source)
at myGroup.sv.hibernate.HibernateService.getSystemSession(Unknown Source)
at myGroup.bwv.service.BwvMandantService.getList(Unknown Source)
at myGroup.bwv.bean.ApplicationBean.getMandantenList(Unknown Source)
at myGroup.bwv.bean.AusschreibungBean.init(Unknown Source)
at myGroup.bwv.bean.AusschreibungBean.(Unknown Source)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at java.lang.Class.newInstance(Class.java:374)
at org.apache.myfaces.config.annotation.Tomcat7AnnotationLifecycleProvider.newInstance(Tomcat7AnnotationLifecycleProvider.java:54)
at org.apache.myfaces.el.unified.resolver.ManagedBeanResolver.createManagedBean(ManagedBeanResolver.java:303)
at org.apache.myfaces.el.unified.resolver.ManagedBeanResolver.getValue(ManagedBeanResolver.java:266)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:66)
at org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:142)
at org.apache.myfaces.el.convert.VariableResolverToELResolver.getValue(VariableResolverToELResolver.java:96)
at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:66)
at org.apache.myfaces.el.unified.resolver.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:142)
at org.apache.el.parser.AstIdentifier.getValue(AstIdentifier.java:80)
at org.apache.el.parser.AstValue.getValue(AstValue.java:137)
at org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
at org.apache.jasper.el.JspValueExpression.getValue(JspValueExpression.java:115)
at javax.faces.component._DeltaStateHelper.eval(_DeltaStateHelper.java:243)
at org.apache.myfaces.component.html.ext.HtmlDataTableHack.createDataModel(HtmlDataTableHack.java:957)
at org.apache.myfaces.component.html.ext.AbstractHtmlDataTable.createDataModel(AbstractHtmlDataTable.java:1605)
at org.apache.myfaces.component.html.ext.HtmlDataTableHack.getDataModel(HtmlDataTableHack.java:932)
at org.apache.myfaces.component.html.ext.AbstractHtmlDataTable.getDataModel(AbstractHtmlDataTable.java:1597)
at org.apache.myfaces.component.html.ext.HtmlDataTableHack.getRowCount(HtmlDataTableHack.java:103)
at org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlTableRendererBase.encodeInnerHtml(HtmlTableRendererBase.java:366)
at org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlTableRendererBase.encodeChildren(HtmlTableRendererBase.java:214)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:488)
at org.apache.myfaces.shared_tomahawk.renderkit.html.HtmlGridRendererBase.renderChildren(HtmlGridRendererBase.java:370)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:519)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:618)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:614)
at org.apache.myfaces.shared_impl.view.JspViewDeclarationLanguageBase.actuallyRenderView(JspViewDeclarationLanguageBase.java:322)
at org.apache.myfaces.shared_impl.view.JspViewDeclarationLanguageBase.renderView(JspViewDeclarationLanguageBase.java:181)
at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:85)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:191)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1527)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.lang.Thread.run(Thread.java:745)

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