Hello Everyone,
I am using cmdbuild since years and I never had this problem before.
I have the version 2.5.1 for now (someday I ll upgrade to the 3.x.x ! 
)
I have a problem when I want to import a report. I already have more than 35 reports (made with jasperreport) and I never had the problem.
When I import the report, I have this error :
CMDBuild
Error while analizing report
DEBUG 2020-04-06 18:27:43 [jsonrpc ] Uncaught exception calling method class org.cmdbuild.servlets.json.schema.ModReport.analyzeJasperReport
java.lang.NullPointerException
at org.cmdbuild.servlets.json.schema.ModReport.setReportImagesAndSubReports(ModReport.java:446)
at org.cmdbuild.servlets.json.schema.ModReport.analyzeJasperReport(ModReport.java:415)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.cmdbuild.servlets.JSONDispatcher.dispatch(JSONDispatcher.java:106)
at org.cmdbuild.servlets.JSONDispatcher.doPost(JSONDispatcher.java:64)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.cmdbuild.filters.AuthFilter.doFilter(AuthFilter.java:183)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.cmdbuild.filters.PatchManagerFilter.doFilter(PatchManagerFilter.java:48)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.cmdbuild.filters.ConfCheckFilter.doFilter(ConfCheckFilter.java:31)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.cmdbuild.filters.TranslationFilter.doFilter(TranslationFilter.java:52)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.cmdbuild.filters.LocalizationFilter.doFilter(LocalizationFilter.java:127)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.cmdbuild.filters.RequestLogFilter.doFilterInternal(RequestLogFilter.java:74)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1087)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
I changed my log4j conf to ALL, and the trace are not really helping …
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester] Popping body text '
'
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester.sax] characters(
)
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester.sax] endElement(http://jasperreports.sourceforge.net/jasperreports,jasperReport,jasperReport)
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester] match='jasperReport'
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester] bodyText='
'
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester] Fire body() for FactoryCreateRule[className=net.sf.jasperreports.engine.xml.JasperDesignFactory, attributeName=null, creationFactory=net.sf.jasperreports.engine.xml.JasperDesignFactory@75ed0243]
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester] Fire body() for SetNextRule[methodName=setJasperDesign, paramType=net.sf.jasperreports.engine.design.JasperDesign]
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester] Popping body text ''
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester] Fire end() for SetNextRule[methodName=setJasperDesign, paramType=net.sf.jasperreports.engine.design.JasperDesign]
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester] [SetNextRule]{jasperReport} Call net.sf.jasperreports.engine.xml.JRXmlLoader.setJasperDesign(net.sf.jasperreports.engine.design.JasperDesign@6df9f09c)
TRACE 2020-04-06 18:27:43 [org.apache.commons.beanutils.MethodUtils] Matching name=setJasperDesign on class net.sf.jasperreports.engine.xml.JRXmlLoader
TRACE 2020-04-06 18:27:43 [org.apache.commons.beanutils.MethodUtils] Found straight match: public void net.sf.jasperreports.engine.xml.JRXmlLoader.setJasperDesign(net.sf.jasperreports.engine.design.JasperDesign)
TRACE 2020-04-06 18:27:43 [org.apache.commons.beanutils.MethodUtils] isPublic:true
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester] Fire end() for FactoryCreateRule[className=net.sf.jasperreports.engine.xml.JasperDesignFactory, attributeName=null, creationFactory=net.sf.jasperreports.engine.xml.JasperDesignFactory@75ed0243]
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester] [FactoryCreateRule]{jasperReport} Pop net.sf.jasperreports.engine.design.JasperDesign
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester.sax] endPrefixMapping()
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester.sax] endPrefixMapping(xsi)
DEBUG 2020-04-06 18:27:43 [org.apache.commons.digester.Digester.sax] endDocument()
DEBUG 2020-04-06 18:27:43 [report ] In the report there are 12 images
DEBUG 2020-04-06 18:27:43 [jsonrpc ] Uncaught exception calling method class org.cmdbuild.servlets.json.schema.ModReport.analyzeJasperReport
java.lang.NullPointerException
at org.cmdbuild.servlets.json.schema.ModReport.setReportImagesAndSubReports(ModReport.java:446)
at org.cmdbuild.servlets.json.schema.ModReport.analyzeJasperReport(ModReport.java:415)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.cmdbuild.servlets.JSONDispatcher.dispatch(JSONDispatcher.java:106)
at org.cmdbuild.servlets.JSONDispatcher.doPost(JSONDispatcher.java:64)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.cmdbuild.filters.AuthFilter.doFilter(AuthFilter.java:183)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.cmdbuild.filters.PatchManagerFilter.doFilter(PatchManagerFilter.java:48)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.cmdbuild.filters.ConfCheckFilter.doFilter(ConfCheckFilter.java:31)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.cmdbuild.filters.TranslationFilter.doFilter(TranslationFilter.java:52)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.cmdbuild.filters.LocalizationFilter.doFilter(LocalizationFilter.java:127)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.cmdbuild.filters.RequestLogFilter.doFilterInternal(RequestLogFilter.java:74)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1087)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
The preview mode and jasperreport is working without problem.
Do you have an idea ? 
Thank you