sdk/java: don't reuse fd in Java SDK

[davies]

closes #2116

[codecov-commenter]

Codecov Report

Merging #2122 (83c11a8) into main (35918c3) will decrease coverage by 0.10%.
The diff coverage is 78.78%.

@@            Coverage Diff             @@
##             main    #2122      +/-   ##
==========================================
- Coverage   61.87%   61.76%   -0.11%     
==========================================
  Files         138      138              
  Lines       24839    24844       +5     
==========================================
- Hits        15368    15346      -22     
- Misses       7659     7682      +23     
- Partials     1812     1816       +4     

Impacted Files	Coverage Δ
cmd/rmr.go	58.73% <0.00%> (-1.93%)	⬇️
pkg/fuse/fuse.go	78.10% <0.00%> (+0.50%)	⬆️
pkg/meta/sql_lock.go	71.52% <ø> (ø)
pkg/meta/tkv_lock.go	82.51% <ø> (ø)
pkg/meta/sql.go	65.65% <78.94%> (-0.13%)	⬇️
pkg/meta/base.go	69.89% <100.00%> (+0.18%)	⬆️
pkg/meta/redis.go	71.40% <100.00%> (ø)
pkg/meta/tkv.go	76.71% <100.00%> (+0.03%)	⬆️
pkg/vfs/reader.go	77.18% <0.00%> (-2.56%)	⬇️
pkg/meta/tkv_mem.go	85.54% <0.00%> (-1.74%)	⬇️
... and 4 more

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