DataSet and Query editor dialog Exception

[a.leban]

I am using Jaspersoft Studio 6.1.0. My reports use a MySQL DataSource (com.mysql.jdbc.Driver). The reports were originally generated in an older iReport version (Jasper Reports 5.5.0). The DataSource works without problems in all my reports or when testing it in the Data Adapter Wizard. But every click on the "DataSet and Query editor dialog" button causes this error:

 

This is the stack trace:

java.lang.NullPointerException
    at com.jaspersoft.studio.utils.ModelUtils.getQueryLanguagesOnly(ModelUtils.java:1074)
    at com.jaspersoft.studio.utils.ModelUtils.getQueryLanguages(ModelUtils.java:1044)
    at com.jaspersoft.studio.property.dataset.dialog.DataQueryAdapters.createQuery(DataQueryAdapters.java:153)
    at com.jaspersoft.studio.property.dataset.dialog.DataQueryAdapters.createTop(DataQueryAdapters.java:129)
    at com.jaspersoft.studio.property.dataset.dialog.DatasetDialog.createFormContent(DatasetDialog.java:237)
    at org.eclipse.ui.forms.FormDialog.createDialogArea(FormDialog.java:92)
    at org.eclipse.jface.dialogs.Dialog.createContents(Dialog.java:760)
    at org.eclipse.jface.window.Window.create(Window.java:431)
    at org.eclipse.jface.dialogs.Dialog.create(Dialog.java:1089)
    at org.eclipse.jface.window.Window.open(Window.java:790)
    at com.jaspersoft.studio.property.dataset.dialog.DatasetAction.run(DatasetAction.java:82)
    at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
    at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:584)
    at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:501)
    at org.eclipse.jface.action.ActionContributionItem$6.handleEvent(ActionContributionItem.java:452)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1276)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3562)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3186)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at com.jaspersoft.studio.rcp.intro.Application.start(Application.java:96)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:353)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
    at org.eclipse.equinox.launcher.Main.main(Main.java:1414)
 

I could not find this problem mentioned elsewhere, so it seems I am doing something very wrong. But as said: All reports work without problems with this DataSource. I just cannot open this dialog.

Any ideas what I can do?

Thanks in advance

Andrej