Failed Java version check. Why did this problem occur？

[ZhouTaoWang]

- CONFIGURE CANU
--
Can't exec "command": No such file or directory at /home/wzt001/software/Genomics/canu/build/bin/../lib/perl5/site_perl/canu/Defaults.pm line 1078.
readline() on closed filehandle F at /home/wzt001/software/Genomics/canu/build/bin/../lib/perl5/site_perl/canu/Defaults.pm line 1096.
-- Failed Java version check.
--
-- Trying again.
--
readline() on closed filehandle F at /home/wzt001/software/Genomics/canu/build/bin/../lib/perl5/site_perl/canu/Defaults.pm line 1096.
-- Failed Java version check.
--
-- Trying again.
--
-- Detected gnuplot version '5.4 patchlevel 2   ' (from 'gnuplot') and image format 'png'.
-- Detected samtools version '1.20' / htslib version '1.20' (from 'samtools').

usage:   canu [-version] [-citation] \
              [-haplotype | -correct | -trim | -assemble | -trim-assemble] \
              [-s <assembly-specifications-file>] \
               -p <assembly-prefix> \
               -d <assembly-directory> \
               genomeSize=<number>[g|m|k] \
              [other-options] \
              [-haplotype{NAME} illumina.fastq.gz] \
              [-corrected] \
              [-trimmed] \
              [-pacbio |
               -nanopore |
               -pacbio-hifi] file1 file2 ...

example: canu -d run1 -p godzilla genomeSize=1g -nanopore-raw reads/*.fasta.gz


  To restrict canu to only a specific stage, use:
    -haplotype     - generate haplotype-specific reads
    -correct       - generate corrected reads
    -trim          - generate trimmed reads
    -assemble      - generate an assembly
    -trim-assemble - generate trimmed reads and then assemble them

  The assembly is computed in the -d <assembly-directory>, with output files named
  using the -p <assembly-prefix>.  This directory is created if needed.  It is not
  possible to run multiple assemblies in the same directory.

  The genome size should be your best guess of the haploid genome size of what is being
  assembled.  It is used primarily to estimate coverage in reads, NOT as the desired
  assembly size.  Fractional values are allowed: '4.7m' equals '4700k' equals '4700000'

  Some common options:
    useGrid=string
      - Run under grid control (true), locally (false), or set up for grid control
        but don't submit any jobs (remote)
    rawErrorRate=fraction-error
      - The allowed difference in an overlap between two raw uncorrected reads.  For lower
        quality reads, use a higher number.  The defaults are 0.300 for PacBio reads and
        0.500 for Nanopore reads.
    correctedErrorRate=fraction-error
      - The allowed difference in an overlap between two corrected reads.  Assemblies of
        low coverage or data with biological differences will benefit from a slight increase
        in this.  Defaults are 0.045 for PacBio reads and 0.144 for Nanopore reads.
    gridOptions=string
      - Pass string to the command used to submit jobs to the grid.  Can be used to set
        maximum run time limits.  Should NOT be used to set memory limits; Canu will do
        that for you.
    minReadLength=number
      - Ignore reads shorter than 'number' bases long.  Default: 1000.
    minOverlapLength=number
      - Ignore read-to-read overlaps shorter than 'number' bases long.  Default: 500.
  A full list of options can be printed with '-options'.  All options can be supplied in
  an optional sepc file with the -s option.

  For TrioCanu, haplotypes are specified with the -haplotype{NAME} option, with any
  number of haplotype-specific Illumina read files after.  The {NAME} of each haplotype
  is free text (but only letters and numbers, please).  For example:
    -haplotypeNANNY nanny/*gz
    -haplotypeBILLY billy1.fasta.gz billy2.fasta.gz

  Reads can be either FASTA or FASTQ format, uncompressed, or compressed with gz, bz2 or xz.

  Reads are specified by the technology they were generated with, and any processing performed.

  [processing]
    -corrected
    -trimmed

  [technology]
    -pacbio      <files>
    -nanopore    <files>
    -pacbio-hifi <files>

Complete documentation at http://canu.readthedocs.org/en/latest/

ERROR:  mhap overlapper requires java version at least 1.8.0; you have unknown (from '').
ERROR:  ' -Xmx1g -showversion' reports:

my java version:

java version "1.8.0_431"
Java(TM) SE Runtime Environment (build 1.8.0_431-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.431-b10, mixed mode)

[skoren]

Your java is not in the path so canu is not finding it, similar to #2356. Not sure if this is through conda or something else but as I said in that issue, you can directly point canu to the java you want it to use via the java= option.