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java.lang.NullPointerException: 	at org.hibernate.hql.ast.HqlSqlWalker.createFromJoinElement(HqlSqlWalker.java:264)	at org.hibernate.hql.antlr.HqlSqlBaseWalker.joinElement(HqlSqlBaseWalker.java:3022)	at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:2841)	at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:2719)	at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:513)	at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:371)	at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:201)	at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:151)	at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:189)	at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:130)	at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:83)	at org.hibernate.impl.SessionFactoryImpl.getQuery(SessionFactoryImpl.java:424)	at org.hibernate.impl.SessionImpl.getQueries(SessionImpl.java:870)	at org.hibernate.impl.SessionImpl.list(SessionImpl.java:820)	at org.hibernate.impl.QueryImpl.list(QueryImpl.java:74)	at br.com.sysmap.sunlight.dao.hibernate.HibBaseDAO$3.doInHibernate(HibBaseDAO.java:357)	at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:312)	at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:288)	at br.com.sysmap.sunlight.dao.hibernate.HibBaseDAO.listWithFields(HibBaseDAO.java:256)	at br.com.sysmap.sunlight.service.impl.BaseServiceImpl.listWithFields(BaseServiceImpl.java:151)	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:324)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:288)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:155)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:122)	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:57)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:174)	at $Proxy50.listWithFields(Unknown Source)	at br.com.sysmap.sunlight.web.components.SLDataSource.getCollection(SLDataSource.java:261)	at br.com.sysmap.sunlight.web.components.SLAbstractGrid.getCollection(SLAbstractGrid.java:124)	at br.com.sysmap.sunlight.web.components.SLSummary.getCollection(SLSummary.java:81)	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:324)	at org.apache.taglibs.standard.lang.jstl.ArraySuffix.evaluate(ArraySuffix.java:278)	at org.apache.taglibs.standard.lang.jstl.ComplexValue.evaluate(ComplexValue.java:107)	at org.apache.taglibs.standard.lang.jstl.ELEvaluator.evaluate(ELEvaluator.java:204)	at org.apache.taglibs.standard.lang.jstl.ELEvaluator.evaluate(ELEvaluator.java:163)	at org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evaluator.java:101)	at org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evaluator.java:129)	at org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager.evaluate(ExpressionEvaluatorManager.java:75)	at org.displaytag.tags.el.ExpressionEvaluator.eval(ExpressionEvaluator.java:65)	at org.displaytag.tags.el.ELTableTag.evaluateExpressions(ELTableTag.java:381)	at org.displaytag.tags.el.ELTableTag.doStartTag(ELTableTag.java:319)	at org.apache.jsp.tag.web.summary_tag._jspx_meth_display_table_0(org.apache.jsp.tag.web.summary_tag:808)	at org.apache.jsp.tag.web.summary_tag.doTag(org.apache.jsp.tag.web.summary_tag:298)	at org.apache.jsp.pages.BloqueioDesbloqueio_jsp._jspx_meth_sl_summary_0(org.apache.jsp.pages.BloqueioDesbloqueio_jsp:435)	at org.apache.jsp.pages.BloqueioDesbloqueio_jsp.access$23(org.apache.jsp.pages.BloqueioDesbloqueio_jsp:421)	at org.apache.jsp.pages.BloqueioDesbloqueio_jsp$BloqueioDesbloqueio_jspHelper.invoke0(org.apache.jsp.pages.BloqueioDesbloqueio_jsp:999)	at org.apache.jsp.pages.BloqueioDesbloqueio_jsp$BloqueioDesbloqueio_jspHelper.invoke(org.apache.jsp.pages.BloqueioDesbloqueio_jsp:1153)	at org.apache.jsp.tag.web.screen_tag$screen_tagHelper.invoke0(org.apache.jsp.tag.web.screen_tag:473)	at org.apache.jsp.tag.web.screen_tag$screen_tagHelper.invoke(org.apache.jsp.tag.web.screen_tag:503)	at org.apache.jsp.tag.web.form_tag.doTag(org.apache.jsp.tag.web.form_tag:226)	at org.apache.jsp.tag.web.screen_tag._jspx_meth_sl_form_0(org.apache.jsp.tag.web.screen_tag:401)	at org.apache.jsp.tag.web.screen_tag._jspx_meth_c_when_0(org.apache.jsp.tag.web.screen_tag:369)	at org.apache.jsp.tag.web.screen_tag._jspx_meth_c_choose_0(org.apache.jsp.tag.web.screen_tag:335)	at org.apache.jsp.tag.web.screen_tag._jspx_meth_html_html_0(org.apache.jsp.tag.web.screen_tag:253)	at org.apache.jsp.tag.web.screen_tag.doTag(org.apache.jsp.tag.web.screen_tag:173)	at org.apache.jsp.pages.BloqueioDesbloqueio_jsp._jspx_meth_sl_screen_0(org.apache.jsp.pages.BloqueioDesbloqueio_jsp:98)	at org.apache.jsp.pages.BloqueioDesbloqueio_jsp._jspService(org.apache.jsp.pages.BloqueioDesbloqueio_jsp:68)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:463)	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:398)	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301)	at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1063)	at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:263)	at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:386)	at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:318)	at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:229)	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)	at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:172)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)	at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)	at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)	at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)	at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)	at java.lang.Thread.run(Thread.java:534)