Trying to create groups

[Arby111]

Hello,
I'm trying to use the jhdf library to generate HDF5 data files. I'm trying to create groups. I'm not finding a lot of documentation on how to do things with jhdf. So, this (below) is my latest attempt. This is after I created the file and successfully wrote some top level attributes. So this is Kotlin, not Java but it still should work just fine.

               // create the primary data groups
                val rootgroup = WritableGroupImpl(hdfFileout,"/")
                val nrlgroup = rootgroup.putGroup("NRL_Data")
                val umgroup = rootgroup.putGroup("UM_Data")

The groups are not getting created. Also, I repeatedly close and open the file to add subgroups, data and attributes. It is not clear how do this. I'm wasting a lot of time here. Should I just give up on jhdf and use the java version of HDF5? Thanks.

[jamesmudd]

I think you should look at this example WriteHdf5

However closing and reopening files for editing is not supported ATM. So if you need that then you should not use jHDF.

[Arby111]

Thank you.   On Wed, 01 Oct 2025 08:51:33 -0700, James Mudd ***@***.***> wrote:     I think you should look at this example WriteHdf5 However closing and reopening files for editing is not supported ATM. So if you need that then you should not use jHDF. — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***>