megan version 6.21.7 throw `java.lang.NullPointerException` error

[MajoroMask]

megan version 6.21.7 throw `java.lang.NullPointerException` error

[jfy133]

OK! Thanks @MajoroMask that's enough to warrant the bump.

I will aim to update the module and pipeline over the next few days and include taht with the other bug fixes :)

[jfy133]

Hi @MajoroMask I can't replicate...

The only thing I can think of is you maybe hit a memory error (java is really wierd and inconsistent with memory usage)... , MALT/MEGAN databases are extremely large, so if you have a custom one that could cause errors.

Could you try increasing the amount of memory to that process with a config file, before we bump the version in a patch release (although this will come in the next major release)?

[MajoroMask]

Hi @jfy133 Thanks for your reply.

I tried your solution and I think this time it's not the out of memory issue.

• The exit code is 1 instead of 137 or other that represent memory shortage.

cd /path/into/workdir/34/3e38ec40e5e77328f24cffaba38e1e
cat .exitcode
1

• I tried increase task.memory for this process to 50GB, yet still I got the same error.

cat .command.run | grep 'docker run * --memory'
docker run -i --cpus 1.0 --memory 51200m -e "NXF_DEBUG=${NXF_DEBUG:=0}"

• The error massage pointed out it's a classic java "null pointer" error. I'm not familiar with java so I'll leave it to your guys.

cat .command.err
Error: JavaFX detected no fonts! Please refer to release notes for proper font configuration
Version   MEGAN Community Edition (version 6.21.7, built 23 Jun 2021)
Author(s) Daniel H. Huson
Copyright (C) 2021 Daniel H. Huson. This program comes with ABSOLUTELY NO WARRANTY.
Loading ncbi.map: 2,302,807
Loading ncbi.tre: 2,302,811
Caught:
java.lang.NullPointerException
        at megan/megan.tools.RMA2Info.isDescendant(RMA2Info.java:455)
        at megan/megan.tools.RMA2Info.reportRead2Count(RMA2Info.java:387)
        at megan/megan.tools.RMA2Info.run(RMA2Info.java:153)
        at megan/megan.tools.RMA2Info.main(RMA2Info.java:63)

• I also checked the release note of megan (here) and I found this:

--- Release notes MEGAN6 V6_21_11 (Fri, 20 Aug 2021): ---

- Fixed newly introduce bug in Project menu
- Fixed minor bug in rma2info

Since megan is not open source, I think we can't confirm it on code level. The only thing we know is that they do have a rma2info bug fixed between release 6.21.7 and 6.24.20. So fixing this problem by updating megan version makes sense to me.

That's all I have for now. Hope this information could be of help for you guys.

[MajoroMask]

Well, turns out megan CE is open source (the commit)

[jfy133]

First step: module update nf-core/modules#4228