Thank you for reminding these steps, but I still got this error after I cleaned the server cache.
Call: services/json/dashboard/list
-----------------------------------
Error: org.cmdbuild.servlets.json.management.JsonSerializationException: org.codehaus.jackson.map.JsonMappingException: (was java.lang.UnsupportedOperationException) (through reference chain: org.cmdbuild.servlets.json.management.JsonResponse["response"]->org.cmdbuild.servlets.json.serializers.JsonDashboardListResponse["dataSources"]->java.util.ArrayList[0]->org.cmdbuild.servlets.json.serializers.JsonDataSource["output"])
at org.cmdbuild.servlets.json.management.JsonResponse.toString(JsonResponse.java:61)
at org.cmdbuild.servlets.JSONDispatcher.writeResponseData(JSONDispatcher.java:294)
at org.cmdbuild.servlets.JSONDispatcher.writeResponse(JSONDispatcher.java:211)
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:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.cmdbuild.filters.AuthFilter.doFilter(AuthFilter.java:188)
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:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
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:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.cmdbuild.filters.ConfCheckFilter.doFilter(ConfCheckFilter.java:31)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
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:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
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:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
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:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:528)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1099)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2508)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2497)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.codehaus.jackson.map.JsonMappingException: (was java.lang.UnsupportedOperationException) (through reference chain: org.cmdbuild.servlets.json.management.JsonResponse["response"]->org.cmdbuild.servlets.json.serializers.JsonDashboardListResponse["dataSources"]->java.util.ArrayList[0]->org.cmdbuild.servlets.json.serializers.JsonDataSource["output"])
at org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:218)
at org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:183)
at org.codehaus.jackson.map.ser.std.SerializerBase.wrapAndThrow(SerializerBase.java:140)
at org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:158)
at org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112)
at org.codehaus.jackson.map.ser.std.StdContainerSerializers$IndexedListSerializer.serializeContents(StdContainerSerializers.java:122)
at org.codehaus.jackson.map.ser.std.StdContainerSerializers$IndexedListSerializer.serializeContents(StdContainerSerializers.java:71)
at org.codehaus.jackson.map.ser.std.AsArraySerializerBase.serialize(AsArraySerializerBase.java:86)
at org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:446)
at org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:150)
at org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112)
at org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:446)
at org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:150)
at org.codehaus.jackson.map.ser.BeanSerializer.serialize(BeanSerializer.java:112)
at org.codehaus.jackson.map.ser.StdSerializerProvider._serializeValue(StdSerializerProvider.java:610)
at org.codehaus.jackson.map.ser.StdSerializerProvider.serializeValue(StdSerializerProvider.java:256)
at org.codehaus.jackson.map.ObjectMapper._configAndWriteValue(ObjectMapper.java:2575)
at org.codehaus.jackson.map.ObjectMapper.writeValueAsString(ObjectMapper.java:2097)
at org.cmdbuild.servlets.json.management.JsonResponse.toString(JsonResponse.java:59)
... 50 more
Caused by: java.lang.UnsupportedOperationException
at org.cmdbuild.dao.entrytype.attributetype.UndefinedAttributeType.accept(UndefinedAttributeType.java:17)
at org.cmdbuild.servlets.json.serializers.JsonDashboardDTO$JsonDataSourceParameter$TypeConverter.(JsonDashboardDTO.java:118)
at org.cmdbuild.servlets.json.serializers.JsonDashboardDTO$JsonDataSourceParameter.(JsonDashboardDTO.java:102)
at org.cmdbuild.servlets.json.serializers.JsonDashboardDTO$JsonDataSourceParameter.(JsonDashboardDTO.java:95)
at org.cmdbuild.servlets.json.serializers.JsonDashboardDTO$JsonDataSource$1.apply(JsonDashboardDTO.java:72)
at org.cmdbuild.servlets.json.serializers.JsonDashboardDTO$JsonDataSource$1.apply(JsonDashboardDTO.java:69)
at com.google.common.collect.Iterators$8.transform(Iterators.java:817)
at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48)
at com.google.common.collect.Iterators.addAll(Iterators.java:365)
at com.google.common.collect.Lists.newArrayList(Lists.java:162)
at com.google.common.collect.Lists.newArrayList(Lists.java:146)
at org.cmdbuild.servlets.json.serializers.JsonDashboardDTO$JsonDataSource.getOutput(JsonDashboardDTO.java:91)
at sun.reflect.GeneratedMethodAccessor196.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.jackson.map.ser.BeanPropertyWriter.get(BeanPropertyWriter.java:483)
at org.codehaus.jackson.map.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:418)
at org.codehaus.jackson.map.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:150)
... 65 more