Array#pack with "w' pattern breaks with NPE
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Key: JRUBY-1912
URL: http://jira.codehaus.org/browse/JRUBY-1912
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules
Affects Versions: JRuby 1.1b2
Environment: Latest JRuby 1.1b1
Reporter: Vladimir Sizikov
Attachments: array-pack-empty-array.patch
The following code:
{noformat}
[].pack('w')
{noformat}
Returns in MRI:
ArgumentError: too few arguments
But in JRuby:
Exception in thread "main" java.lang.NullPointerException
at org.jruby.util.Pack.pack(Pack.java:1811)
at org.jruby.RubyArray.pack(RubyArray.java:2204)
at org.jruby.RubyArrayInvoker$pack_method_1_0.call(Unknown Source)
at org.jruby.runtime.CallSite$ICNonBlockCallSite.call(CallSite.java:153)
at
org.jruby.runtime.CallSite$ArgumentBoxingCallSite.call(CallSite.java:100)
at
ruby.home.vvs.array_minus_pack_minus_empty_dot_rb.closure0___rescue_1(array-pack-empty.rb:4)
at
ruby.home.vvs.array_minus_pack_minus_empty_dot_rb.closure0(array-pack-empty.rb:3)
at
ruby.home.vvs.array_minus_pack_minus_empty_dot_rbBlockclosure0xx1.call(Unknown
Source)
at org.jruby.runtime.CompiledBlock.yield(CompiledBlock.java:108)
at org.jruby.runtime.CompiledBlock.yield(CompiledBlock.java:89)
at org.jruby.runtime.Block.yield(Block.java:109)
at org.jruby.RubyArray.each(RubyArray.java:1185)
at org.jruby.RubyArrayInvoker$each_method_0_0.call(Unknown Source)
at org.jruby.runtime.CallSite$ICBlockCallSite.call(CallSite.java:196)
at
org.jruby.runtime.CallSite$ArgumentBoxingCallSite.call(CallSite.java:106)
at
ruby.home.vvs.array_minus_pack_minus_empty_dot_rb.__file__(array-pack-empty.rb:1)
at
ruby.home.vvs.array_minus_pack_minus_empty_dot_rb.load(array-pack-empty.rb)
at org.jruby.Ruby.runScript(Ruby.java:627)
at org.jruby.Ruby.runNormally(Ruby.java:547)
at org.jruby.Ruby.runFromMain(Ruby.java:470)
at org.jruby.Main.runInterpreter(Main.java:213)
at org.jruby.Main.runInterpreter(Main.java:169)
at org.jruby.Main.run(Main.java:118)
at org.jruby.Main.run(Main.java:92)
at org.jruby.Main.main(Main.java:83)
The proposed patch fixes the problem. Regression tests has already been added
to rubyspecs.
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