Database connector: ExecuteQuery Error

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Hi All,   we are trying to get our custom data from sql server database using database connector: ExecuteQuery but we are getting below error message. Error Message: An error has occurred while handling the request. [User 'Anonymous_1d1edc74-1859-475b-8142-1711846b1c6b' with session id '2f6281da-XXXX-XXXX-XXXX-XXXXXXXX0d63' and roles 'Administrator'] -------- com.mendix.core.CoreException: com.mendix.modules.microflowengine.MicroflowException: com.mendix.core.CoreRuntimeException: com.mendix.systemwideinterfaces.MendixRuntimeException: java.lang.NullPointerException     at MyFirstModule.Microflow (JavaAction : 'Execute query') Advanced stacktrace:     at com.mendix.basis.component.InternalCoreBase.execute(InternalCoreBase.java:389) Caused by: com.mendix.modules.microflowengine.MicroflowException: com.mendix.core.CoreRuntimeException: com.mendix.systemwideinterfaces.MendixRuntimeException: java.lang.NullPointerException     at MyFirstModule.Microflow (JavaAction : 'Execute query') Advanced stacktrace:     at com.mendix.modules.microflowengine.MicroflowUtil.processException(MicroflowUtil.java:146) Caused by: com.mendix.core.CoreException: com.mendix.core.CoreRuntimeException: com.mendix.systemwideinterfaces.MendixRuntimeException: java.lang.NullPointerException     at com.mendix.basis.component.InternalCoreBase.execute(InternalCoreBase.java:418) Caused by: com.mendix.core.CoreRuntimeException: com.mendix.systemwideinterfaces.MendixRuntimeException: java.lang.NullPointerException     at com.mendix.basis.actionmanagement.ActionManagerBase.executeSync(ActionManagerBase.java:159) Caused by: com.mendix.systemwideinterfaces.MendixRuntimeException: java.lang.NullPointerException     at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:36) Caused by: java.lang.NullPointerException: null     at databaseconnector.actions.ExecuteQuery.executeAction(ExecuteQuery.java:80)     at databaseconnector.actions.ExecuteQuery.executeAction(ExecuteQuery.java:1)     at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:46)     at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:79)     at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:57)     at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:55)     at com.mendix.basis.actionmanagement.ActionManagerBase$1.execute(ActionManagerBase.java:150)     at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32)     at com.mendix.basis.actionmanagement.ActionManagerBase.executeSync(ActionManagerBase.java:155)     at com.mendix.basis.component.InternalCoreBase.execute(InternalCoreBase.java:414)     at com.mendix.modules.microflowengine.actions.actioncall.JavaAction.execute(JavaAction.scala:56)     at com.mendix.modules.microflowengine.microflow.impl.MicroflowObject.execute(MicroflowObject.java:47)     at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAfterBreakingIfNecessary(MicroflowImpl.java:201)     at com.mendix.modules.microflowengine.microflow.impl.MicroflowImpl.executeAction(MicroflowImpl.java:157)     at com.mendix.systemwideinterfaces.core.UserAction.execute(UserAction.java:46)     at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.doCall(CoreActionHandlerImpl.scala:79)     at com.mendix.basis.actionmanagement.CoreActionHandlerImpl.call(CoreActionHandlerImpl.scala:57)     at com.mendix.core.actionmanagement.CoreAction.call(CoreAction.java:55)     at com.mendix.basis.actionmanagement.ActionManagerBase$1.execute(ActionManagerBase.java:150)     at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32)     at com.mendix.basis.actionmanagement.ActionManagerBase.executeSync(ActionManagerBase.java:155)     at com.mendix.basis.component.InternalCoreBase.execute(InternalCoreBase.java:383)     at com.mendix.basis.component.InternalCoreBase.execute(InternalCoreBase.java:398)     at com.mendix.webui.actions.client.ExecuteMicroflowAction.runMicroflow(ExecuteMicroflowAction.scala:46)     at com.mendix.webui.actions.client.ExecuteMicroflowAction.apply(ExecuteMicroflowAction.scala:32)     at com.mendix.webui.actions.client.ExecuteMicroflowAction.apply(ExecuteMicroflowAction.scala:15)     at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$4(RegularClientAction.scala:46)     at com.mendix.webui.requesthandling.helpers.StateHandling.withState(StateHandling.scala:33)     at com.mendix.webui.requesthandling.helpers.StateHandling.withState$(StateHandling.scala:21)     at com.mendix.webui.actions.client.RegularClientAction.withState(RegularClientAction.scala:21)     at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$3(RegularClientAction.scala:44)     at scala.util.Try$.apply(Try.scala:213)     at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2(RegularClientAction.scala:44)     at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2$adapted(RegularClientAction.scala:42)     at com.mendix.webui.requesthandling.helpers.ContextHandling.$anonfun$inContext$4(ContextHandling.scala:41)     at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)     at com.mendix.basis.actionmanagement.IMonitoredAction$$anon$1.execute(IMonitoredAction.scala:47)     at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32)     at com.mendix.basis.actionmanagement.IMonitoredAction.monitor(IMonitoredAction.scala:49)     at com.mendix.basis.actionmanagement.IMonitoredAction.monitor$(IMonitoredAction.scala:25)     at com.mendix.webui.requesthandling.helpers.ContextHandling$ClientMonitoredAction.monitor(ContextHandling.scala:49)     at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:41)     at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:27)     at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:21)     at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:24)     at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:19)     at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:21)     at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$1(RegularClientAction.scala:42)     at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)     at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest(ProfileHandling.scala:14)     at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest$(ProfileHandling.scala:10)     at com.mendix.webui.actions.client.RegularClientAction.profileRequest(RegularClientAction.scala:21)     at com.mendix.webui.actions.client.RegularClientAction.execute(RegularClientAction.scala:39)     at com.mendix.webui.requesthandling.ClientRequestHandler.handleAction(ClientRequestHandler.scala:124)     at com.mendix.webui.requesthandling.ClientRequestHandler.processRequest(ClientRequestHandler.scala:101)     at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:40)     at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:72)     at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:69)     at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:32)     at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.java:75)     at com.mendix.basis.impl.MxRuntimeImpl.processRequest(MxRuntimeImpl.java:909)     at com.mendix.m2ee.appcontainer.server.handler.RuntimeHandler.service(RuntimeHandler.java:42)     at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)     at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:867)     at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:542)     at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)     at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1588)     at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255)     at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1345)     at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203)     at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480)     at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1557)     at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201)     at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1247)     at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144)     at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)     at org.eclipse.jetty.server.Server.handle(Server.java:502)     at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364)     at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260)     at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305)     at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)     at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168)     at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126)     at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366)     at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765)     at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683)     at java.lang.Thread.run(Thread.java:748)     Also check below inputs parameter which we have passed to ExecuteQuery microflow   regards, Rupesh
asked
2 answers
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Null pointers are most of the time caused by an object not being there (ie empty). Some remarks: a bit strange that an anonymous user has the administration role. Normally you would have a real user doing this kind of stuff. And have you checked that rupesh does indeed has access rights to the database?

Regards,

Ronald

 

answered
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Are you sure the HttpResponse the return object of your query? You need to provide an entity which matches all the colums you retrieve exactly. Usually it's also best to explicitly state which columns you want to retrieve, and provide and alias which matches your attribute names exactly.

So write your queries as follows:

select c1 as "col1”, c2 as “col2” from mytable

 

answered