Hi John, many thanks for your help! You saved my day! All read data looks very well. BTW: The exception, which I found also happens in ToolsUI: - Open toolsUI-5.0.0.jar - Click Viewer - Enable Enhance - Open my BUFR file - Click on Show data as shown in the screenshot The full exception in the window is: java.lang.ClassCastException: ucar.ma2.ArrayObject$D1 cannot be cast to ucar.ma2.ArrayStructure at ucar.nc2.dataset.StructureDS.convert(StructureDS.java:268) at ucar.nc2.dataset.SequenceDS.read(SequenceDS.java:84) at ucar.nc2.ui.op.DatasetViewer.showData(DatasetViewer.java:566) at ucar.nc2.ui.op.DatasetViewer.access$1000(DatasetViewer.java:59) at ucar.nc2.ui.op.DatasetViewer$NestedTable$3.actionPerformed(DatasetViewer.java:416) at javax.swing.AbstractButton.fireActionPerformed(Unknown Source) at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source) at javax.swing.DefaultButtonModel.setPressed(Unknown Source) at javax.swing.AbstractButton.doClick(Unknown Source) at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source) at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source) at java.awt.Component.processMouseEvent(Unknown Source) at javax.swing.JComponent.processMouseEvent(Unknown Source) at java.awt.Component.processEvent(Unknown Source) at java.awt.Container.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source) at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.awt.EventQueue.access$500(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.awt.EventQueue$3.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.awt.EventQueue$4.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) Kind regards Netty Gesendet: Dienstag, 03. September 2019 um 03:55 Uhr Von: "John Caron" <jcaron1129@xxxxxxxxx> An: netty.jawn@xxxxxx Cc: "NetCDF-Java community" <netcdf-java@xxxxxxxxxxxxxxxx> Betreff: Re: [netcdf-java] Reading sequences from BUFR with NetcdfDataset Hi netty: Sorry for the crappy documents and confusion. Sequences are strange, they dont behave like normal Arrays. As sort-of described here: https://www.unidata.ucar.edu/software/netcdf-java/current/reference/Cookbook.html#readSequences you cant call read(), you can only call getStructureIterator() and iterate, because sequences dont have a fixed size. You have nested sequences: a BUFR file consists of a variable number of BUFR messages (top level sequence), and each BUFR message has a variable number of Long_time_period_or_displacement fields (nested sequence). Heres some code that can get you started: public void testReadSequenceEnhanced() throws IOException {try (NetcdfDataset ncd = NetcdfDataset.openDataset("yourFilename")) {SequenceDS record = (SequenceDS) ncd.findVariable("obs"); try (StructureDataIterator iter = record.getStructureIterator()) {int recordCount = 0;while (iter.hasNext()) {StructureData sdata = iter.next();Assert.assertNotNull(sdata); recordCount++; ArraySequence nestedSequence = sdata.getArraySequence("Long_time_period_or_displacement");try (StructureDataIterator nestedIter = nestedSequence.getStructureDataIterator()) {int nestedCount = 0;while (nestedIter.hasNext()) {StructureData nestedData = nestedIter.next();Assert.assertNotNull(nestedData);NCdumpW.printStructureData(new PrintWriter(System.out), nestedData); nestedCount++; }Assert.assertEquals(1685, nestedCount); } }Assert.assertEquals(1, recordCount); } } } Theres also this doc that may be useful: https://www.unidata.ucar.edu/software/netcdf-java/current/reference/StructureData.html[https://www.unidata.ucar.edu/software/netcdf-java/current/reference/StructureData.html] Good luck! On Mon, Sep 2, 2019 at 8:18 AM <netty.jawn@xxxxxx[mailto:netty.jawn@xxxxxx]> wrote:Hi, I have to read the attached BUFR-File with netcdf-java and it works a little bit. I opened my BUFR-File with ToolsUI to examine the content. Here was the first surprise: The icon https://docs.unidata.ucar.edu/netcdf-java/5.0/userguide/images/netcdf-java/tutorial/cdmdatasets/enhanceButton.jpg[https://docs.unidata.ucar.edu/netcdf-java/5.0/userguide/images/netcdf-java/tutorial/cdmdatasets/enhanceButton.jpg] shows "add Coordinates..." as tooltip. But it is actually the enable/disable of the enhance-mode, as stated here https://docs.unidata.ucar.edu/netcdf-java/5.0/userguide/netcdf_dataset.html[https://docs.unidata.ucar.edu/netcdf-java/5.0/userguide/netcdf_dataset.html] The tooltip should be changed. Reading variables was easy thanks to the enhance-mode: try (NetcdfDataset ncFile = NetcdfDataset.openDataset(filename);) { VariableDS variable = (VariableDS) ncFile.findVariable("obs.Software_identification_and_version_number"); System.out.println(variable.readScalarString()); } Float and all other types are correctly enhanced. Naively I thought reading sequences is easy too. I have to read the sequence "obs.Long_time_period_or_displacement" (as an example). Aunt Google showed me the function "showNestedSequence" from https://www.unidata.ucar.edu/software/netcdf-java/current/reference/Cookbook.html[https://www.unidata.ucar.edu/software/netcdf-java/current/reference/Cookbook.html] (can't find it in the current documentation). This function shows me all values, but not enhanced. Furthermore 2 nested loops were used. I would prefer ONE loop (if possible). After (I think) thousands of failed attempts, I came to this try (NetcdfDataset ncFile = NetcdfDataset.openDataset(filename);) { VariableDS variable = (VariableDS) ncFile.findVariable("obs.Long_time_period_or_displacement"); System.out.println("Type: " + variable.getDataType()); Array value = variable.read(); System.out.println("THIS LINE IS NOT PRINTED"); } The following exception is thrown: java.lang.ClassCastException: class ucar.ma2.ArrayObject$D1 cannot be cast to class ucar.ma2.ArrayStructure (ucar.ma2.ArrayObject$D1 and ucar.ma2.ArrayStructure are in unnamed module of loader org.apache.catalina.loader.ParallelWebappClassLoader @ebbfb89) at ucar.nc2.dataset.StructureDS.convert(StructureDS.java:268) at ucar.nc2.dataset.SequenceDS.read(SequenceDS.java:84) at de.sample.BUFRTest.showNestedSequenceNew(BUFRTest.java:88) Line 88 is the "variable.read();". I called your netcdf-lib from a servlet, therefore the "org.apache.catalina", but this should not be the problem. So it seems this sentence is not correct: https://docs.unidata.ucar.edu/netcdf-java/5.0/userguide/netcdf_dataset.html[https://docs.unidata.ucar.edu/netcdf-java/5.0/userguide/netcdf_dataset.html] "Note that NetcdfDataset is a subclass of NetcdfFile, and so can be used wherever a NetcdfFile is used." Someone suggested to have a look at NCdumpW, which I also did, but this program does not enhance any values. Since I don't want to open my file as NetcdfDataset and again as NetcdfFile, I would try to open it as NetcdfFile and manually enhance the values. But no idea how to do this. Any good solution for my problem is also appreciated. Thanks Kind regards Netty_______________________________________________ NOTE: All exchanges posted to Unidata maintained email lists are recorded in the Unidata inquiry tracking system and made publicly available through the web. 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