Hi Matt, I encountered the same issue again. Currently I am using Jasper Report Server version 4.7. The message "Exception getting dataset from cache" is being thrown every time I drag a field into the ad-hoc report designer. Below are the log messages: 2012-07-11 10:11:46,509 INFO command,Thread-1:75 - Starting the upgrade process for AdhocReportUnit objects. This process may be very time-consuming, depending on the number of Ad Hoc reports in your repository. 2012-07-11 10:11:46,538 INFO command,Thread-1:75 - Number of AdhocReportUnits found: 0 2012-07-11 10:11:46,539 INFO command,Thread-1:75 - Upgrade process for AdhocReportUnit objects completed successfully. 2012-07-11 10:15:18,986 ERROR AdhocAjaxController,http-9020- 7:842 - ad hoc controller exception java.lang.RuntimeException: exception getting dataset from cache at com.jaspersoft.commons.semantic.dsimpl.memory.MemoryDataSet.getWorkingDataSet(MemoryDataSet.java:178) at com.jaspersoft.ji.adhoc.strategy.CommonDomainDataStrategy.getWorkingDataSet(CommonDomainDataStrategy.java:1023) at com.jaspersoft.ji.adhoc.strategy.CommonDomainDataStrategy.getWorkingDataSet(CommonDomainDataStrategy.java:995) at com.jaspersoft.ji.adhoc.strategy.BaseWrappingDataStrategy.getWorkingDataSet(BaseWrappingDataStrategy.java:113) at com.jaspersoft.ji.adhoc.InteractiveDataLayoutEngine.initWorkingDataSet(InteractiveDataLayoutEngine.java:292) at com.jaspersoft.ji.adhoc.InteractiveOLAPCrosstabEngine.initWorkingDataSet(InteractiveOLAPCrosstabEngine.java:1373) at com.jaspersoft.ji.adhoc.InteractiveOLAPCrosstabEngine.initDimensionDataSet(InteractiveOLAPCrosstabEngine.java:1360) at com.jaspersoft.ji.adhoc.InteractiveOLAPCrosstabEngine.generateViewModel(InteractiveOLAPCrosstabEngine.java:315) at com.jaspersoft.ji.adhoc.InteractiveOLAPCrosstabEngine.getInteractiveReport(InteractiveOLAPCrosstabEngine.java:142) at com.jaspersoft.ji.adhoc.action.AdhocAjaxController.generateReport(AdhocAjaxController.java:1841) at com.jaspersoft.ji.adhoc.action.AdhocCrosstabAjaxController.insertDimensionInAxisWithChild(AdhocCrosstabAjaxController.java:857) 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 org.springframework.web.servlet.mvc.multiaction.MultiActionController.invokeNamedMethod(MultiActionController.java:471) at org.springframework.web.servlet.mvc.multiaction.MultiActionController.handleRequestInternal(MultiActionController.java:408) at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:153) at com.jaspersoft.ji.adhoc.action.AdhocAjaxController.handleRequest(AdhocAjaxController.java:213) at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:399) at com.jaspersoft.jasperserver.api.security.IPadSupportFilter.doFilter(IPadSupportFilter.java:67) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at com.jaspersoft.jasperserver.api.security.JSSwitchUserProcessingFilter.doFilterHttp(JSSwitchUserProcessingFilter.java:154) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at org.springframework.security.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109) at org.springframework.security.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at org.springframework.security.ui.ExceptionTranslationFilter.doFilterHttp(ExceptionTranslationFilter.java:101) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at com.jaspersoft.ji.license.LicenseCheckFilter.doFilter(LicenseCheckFilter.java:108) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at com.jaspersoft.ji.license.JILicenseFilter.doFilter(JILicenseFilter.java:66) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at org.springframework.security.providers.anonymous.AnonymousProcessingFilter.doFilterHttp(AnonymousProcessingFilter.java:105) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at com.jaspersoft.jasperserver.api.metadata.user.service.impl.MetadataAuthenticationProcessingFilter.doFilter(MetadataAuthenticationProcessingFilter.java:139) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at com.jaspersoft.jasperserver.war.util.RequestParameterAuthenticationFilter.doFilter(RequestParameterAuthenticationFilter.java:96) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at com.jaspersoft.jasperserver.multipleTenancy.MTBasicProcessingFilter.doFilterHttp(MTBasicProcessingFilter.java:180) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at com.jaspersoft.jasperserver.war.UserPreferencesFilter.doFilter(UserPreferencesFilter.java:185) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at org.springframework.security.ui.AbstractProcessingFilter.doFilterHttp(AbstractProcessingFilter.java:278) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at com.jaspersoft.jasperserver.war.UserPreferencesFilter.doFilter(UserPreferencesFilter.java:185) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at com.jaspersoft.jasperserver.api.logging.filter.BasicLoggingFilter.doFilter(BasicLoggingFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at com.jaspersoft.jasperserver.api.security.JSCsrfGuardFilter.doFilter(JSCsrfGuardFilter.java:83) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at com.jaspersoft.jasperserver.api.security.WebAppSecurityFilter.doFilter(WebAppSecurityFilter.java:76) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at com.jaspersoft.jasperserver.war.MultipartRequestWrapperFilter.doFilter(MultipartRequestWrapperFilter.java:90) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at com.jaspersoft.jasperserver.api.security.encryption.EncryptionFilter.doFilter(EncryptionFilter.java:130) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at org.springframework.security.context.HttpSessionContextIntegrationFilter.doFilterHttp(HttpSessionContextIntegrationFilter.java:235) at org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53) at org.springframework.security.util.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:411) at org.springframework.security.util.FilterChainProxy.doFilter(FilterChainProxy.java:188) at org.springframework.security.util.FilterToBeanProxy.doFilter(FilterToBeanProxy.java:99) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at com.jaspersoft.jasperserver.war.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:67) at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at com.jaspersoft.jasperserver.war.P3PFilter.doFilter(P3PFilter.java:43) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:558) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579) at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555) at java.lang.Thread.run(Thread.java:619) Caused by: com.jaspersoft.commons.dataset.DataSetException: exception fetching from cache at com.jaspersoft.commons.datarator.BaseDataSetCacheImpl.getWorkingDataSet(BaseDataSetCacheImpl.java:141) at com.jaspersoft.commons.semantic.dsimpl.memory.MemoryDataSet.getWorkingDataSet(MemoryDataSet.java:94) ... 96 more Caused by: com.jaspersoft.jasperserver.api.JSException: ADH_1009_SQL_GENERATE_ERROR at com.jaspersoft.ji.adhoc.strategy.CommonDomainDataStrategy$CacheListener.stateChanged(CommonDomainDataStrategy.java:1069) at com.jaspersoft.commons.datarator.CachedData.setState(CachedData.java:181) at com.jaspersoft.commons.datarator.CachedData.setThrowable(CachedData.java:193) at com.jaspersoft.commons.datarator.CachedData.fetchData(CachedData.java:163) at com.jaspersoft.commons.datarator.BaseDataSetCacheImpl.getWorkingDataSet(BaseDataSetCacheImpl.java:138) ... 97 more Thanks, Joefer