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java.lang.NullPointerException: 	at br.com.mosaicodigital.modelo.ListaEscola.findAll(ListaEscola.java:43)	at br.com.mosaicodigital.controle.MostraEscolaAtiva.getEscolas(MostraEscolaAtiva.java:37)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at javax.el.BeanELResolver.getValue(BeanELResolver.java:302)	at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)	at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)	at com.sun.el.parser.AstValue.getValue(AstValue.java:116)	at com.sun.el.parser.AstValue.getValue(AstValue.java:163)	at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:219)	at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)	at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)	at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)	at javax.faces.component.UIData.getValue(UIData.java:731)	at javax.faces.component.UIData.getDataModel(UIData.java:1798)	at javax.faces.component.UIData.setRowIndexWithoutRowStatePreserved(UIData.java:484)	at javax.faces.component.UIData.setRowIndex(UIData.java:473)	at javax.faces.component.UIData.visitColumnsAndColumnFacets(UIData.java:2078)	at javax.faces.component.UIData.visitTree(UIData.java:1431)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1600)	at com.sun.faces.application.view.StateManagementStrategyImpl.saveView(StateManagementStrategyImpl.java:149)	at com.sun.faces.application.StateManagerImpl.saveView(StateManagerImpl.java:133)	at com.sun.faces.application.view.WriteBehindStateWriter.flushToWriter(WriteBehindStateWriter.java:225)	at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:418)	at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:410)	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1534)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)	at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:326)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:227)	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:170)	at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:822)	at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:719)	at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1013)	at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)	at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)	at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)	at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)	at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)	at com.sun.grizzly.ContextTask.run(ContextTask.java:71)	at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)	at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)	at java.lang.Thread.run(Thread.java:662)