I am trying to run salmon and it keeps giving me 2 java exceptions:

    at java.util.zip.GZIPInputStream.readUByte(GZIPInputStream.java:268)
    at java.util.zip.GZIPInputStream.readUShort(GZIPInputStream.java:258)
    at java.util.zip.GZIPInputStream.readHeader(GZIPInputStream.java:164)
    at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:79)
    at java.util.zip.GZIPInputStream.<init>(GZIPInputStream.java:91)
    at uk.ac.babraham.FastQC.Utilities.MultiMemberGZIPInputStream.<init>(MultiMemberGZIPInputStream.java:37)


java.lang.ArrayIndexOutOfBoundsException: -1
    at uk.ac.babraham.FastQC.Modules.SequenceLengthDistribution.calculateDistribution(SequenceLengthDistribution.java:100)
    at uk.ac.babraham.FastQC.Modules.SequenceLengthDistribution.raisesError(SequenceLengthDistribution.java:184)
    at uk.ac.babraham.FastQC.Report.HTMLReportArchive.startDocument(HTMLReportArchive.java:336)
    at uk.ac.babraham.FastQC.Report.HTMLReportArchive.<init>(HTMLReportArchive.java:84)
    at uk.ac.babraham.FastQC.Analysis.OfflineRunner.analysisComplete(OfflineRunner.java:155)
    at uk.ac.babraham.FastQC.Analysis.AnalysisRunner.run(AnalysisRunner.java:110)
    at java.lang.Thread.run(Thread.java:745)

    at uk.ac.babraham.FastQC.Sequence.FastQFile.<init>(FastQFile.java:80)
    at uk.ac.babraham.FastQC.Sequence.SequenceFactory.getSequenceFile(SequenceFactory.java:106)
    at uk.ac.babraham.FastQC.Sequence.SequenceFactory.getSequenceFile(SequenceFactory.java:62)
    at uk.ac.babraham.FastQC.Analysis.OfflineRunner.processFile(OfflineRunner.java:129)
    at uk.ac.babraham.FastQC.Analysis.OfflineRunner.<init>(OfflineRunner.java:102)
    at uk.ac.babraham.FastQC.FastQCApplication.main(FastQCApplication.java:316)

I installed salmon using Anacondas' conda install -c bioconda salmon and all other necessary packages in the same way. I thought that it could be a problem with fastqc, so I uninstalled it and then installed it manually (through the fastqc.zip file), but the output remained the same. I am using Java8:

java -version
openjdk version "1.8.0_92"
OpenJDK Runtime Environment (Zulu (build 1.8.0_92-b15)
OpenJDK 64-Bit Server VM (Zulu (build 25.92-b15, mixed mode)

I am running the script on a cluster with SLURM. Locally on my laptop the script is running without any issues. I am really stuck and do not know what to try, so any suggestions would be greatly appreciated.

Update Another issue that I just found is the following (the last command that salmon is trying to execute):

Exception : [Failed to read 8 bytes from input stream! Read 0]
salmon quant was invoked improperly.

Then I searched online for the issue and found the following thread:


However, updating salmon to the newest 0.9.1 version did not solve the issue.

Edit The command I am running is the following one:

python "$path/salmon_rna_seq.py" -L 'IU' -E "$path/jyvo_experiment-
metadata.yaml" -T 'gencode_mouse_m13' -C "$path/salmon_rna_seq.yaml" -I 
"$path_to_fastq/$name-lec_1_r1.fq.gz" "$path_to_fastq/$name-
lec_1_r2.fq.gz" -O "$path/res/$name-lec_1" -S "$name-lec_1" -P '6' -X 'True'

The command is run by Pypiper: https://github.com/epigen/pypiper Inside of salmon_rna_seq.py I am also running commands to treat the data, the salmon part looks the following way:

def salmon(self):
    cmd = "salmon quant -i " + self.indexed_transcriptome
    cmd += " -l " + self.lib_type

    if self.trim:
        cmd += " -1 " + self.sample_files['r1']['fastq']['trimmed_paired']
        cmd += " -2 " + self.sample_files['r2']['fastq']['trimmed_paired']
        cmd += " -1 " + self.sample_files['r1']['fastq']['chastity']
        cmd += " -2 " + self.sample_files['r2']['fastq']['chastity']

    cmd += " -o " + self.sample_dirs['salmon']['base']
    cmd += " --numBootstraps=30"
self.pipe_manager.run(cmd, self.sample_files['salmon'])

Commands that the Pypiper runs are the following ones (_commands.sh Pypiper file):

zcat -c $PATH/res/old-lec_1/fastq/merged/old-lec_1_r1.fq.gz | grep -A 3 
'^@.*[^:]*:N:[^:]*:' | grep -v '^\-\-$' | gzip -c > $PATH/res/old-lec_1/fastq

zcat -c $PATH/res/old-lec_1/fastq/merged/old-lec_1_r2.fq.gz | grep -A 3 
'^@.*[^:]*:N:[^:]*:' | grep -v '^\-\-$' | gzip -c > $PATH/res/old-lec_1/fastq

java -jar $HOME/anaconda2/share/trimmomatic-0.36-5
/trimmomatic.jar PE -threads 6 -phred33 $PATH/res/old-lec_1/fastq/chastity/old-
lec_1_r1.fq.gz $PATH/res/old-lec_1/fastq/chastity/old-lec_1_r2.fq.gz $PATH/res/old-
lec_1/fastq/trimmed/old-lec_1_r1.fq.gz $PATH/res/old-lec_1/fastq/trimmed/unpaired
/old-lec_1_r1.fq.gz $PATH/res/old-lec_1/fastq/trimmed/old-lec_1_r2.fq.gz $PATH/res/old-
lec_1/fastq/trimmed/unpaired/old-lec_1_r2.fq.gz ILLUMINACLIP:$HOME/anaconda2/share/trimmomatic-0.36-5/adapters
/Small_List_Of_Adapters.fa:2:30:10 LEADING:3 TRAILING:3 SLIDINGWINDOW:4:15

fastqc $PATH/res/old-lec_1/fastq/merged/old-lec_1_r1.fq.gz --outdir $PATH/res/old-

fastqc $PATH/res/old-lec_1/fastq/chastity/old-lec_1_r1.fq.gz --outdir $PATH/res/old-

fastqc $PATH/res/old-lec_1/fastq/merged/old-lec_1_r2.fq.gz --outdir $PATH/res/old-

fastqc $PATH/res/old-lec_1/fastq/chastity/old-lec_1_r2.fq.gz --outdir $PATH/res/old-

fastqc $PATH/res/old-lec_1/fastq/trimmed/old-lec_1_r1.fq.gz --outdir $PATH/res/old-

fastqc $PATH/res/old-lec_1/fastq/trimmed/old-lec_1_r2.fq.gz --outdir $PATH/res/old-

salmon quant -i $HOME/Genomes/mouse/salmon
/gencode.vM13.transcripts.fa.sidx -l IU -1 $PATH/res/old-lec_1/fastq/trimmed
/old-lec_1_r1.fq.gz -2 $PATH/res/old-lec_1/fastq/trimmed/old-
lec_1_r2.fq.gz -o $PATH/res/old-lec_1/quantification --numBootstraps=30


After running manually gzip -t on a file:

-bash-4.2$ gzip -t old-lec_1_r1.fq.gz 
gzip: old-lec_1_r1.fq.gz: unexpected end of file

So, I guess the file is corrupted and the issue is with some library that is generating the file. However, reinstalling manually other libraries do not help.

  • 1
    $\begingroup$ Can you run gzip -t on the file(s) to see if it/they are corrupt? That'd be the interpretation of the error messages you're seeing. Make sure to run this on the cluster, in case there's some sort of "modified in transit" networking error going on. $\endgroup$
    – Devon Ryan
    Dec 12, 2017 at 23:57
  • 2
    $\begingroup$ This would be my guess. Also, however, I'm not sure how Java is involved (since Salmon is written completely in C++). $\endgroup$
    – nomad
    Dec 13, 2017 at 3:53
  • 4
    $\begingroup$ It looks like FastQC is being invoked somewhere. Providing the precise commands invoked will help us troubleshoot the problem. $\endgroup$ Dec 13, 2017 at 5:06
  • $\begingroup$ Yes, please edit your question and show the exact commands you are using. It's hard to debug something if we don't know how to replicate it. $\endgroup$
    – terdon
    Dec 13, 2017 at 9:59
  • 3
    $\begingroup$ Oh god. I swear I didn’t notice the pun in my previous comment. $\endgroup$ Dec 13, 2017 at 11:11

1 Answer 1


The issue was caused by the corrupted input .fastq files that were damaged somehow upon uploading them from the local machine. We figured it out by md5sum command output comparison. We have not yet managed to actually run all of the script still, it is failing, but for another reason now.


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