NullPointerException when deserializing a Set with YAML.load #5222
Description
On JRuby 9.2.0.0, if you launch irb the following code will cause a NullPointerException
require 'yaml'
require 'set'
YAML.load "--- !ruby/object:Set\nhash: {}\n" # the string is the result of YAML.dump(Set.new)
here's the stack trace:
Traceback (most recent call last):
16: from org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:202)
15: from org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:206)
14: from org.jruby.RubyProc$INVOKER$i$0$0$call.call(RubyProc$INVOKER$i$0$0$call.gen)
13: from org.jruby.RubyProc.call(RubyProc.java:266)
12: from org.jruby.RubyProc.call(RubyProc.java:286)
11: from org.jruby.runtime.Block.call(Block.java:124)
10: from org.jruby.runtime.IRBlockBody.call(IRBlockBody.java:79)
9: from org.jruby.runtime.MixedModeIRBlockBody.commonYieldPath(MixedModeIRBlockBody.java:153)
8: from org.jruby.ir.interpreter.Interpreter.INTERPRET_BLOCK(Interpreter.java:129)
7: from org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:72)
6: from org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:344)
5: from org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:139)
4: from org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:323)
3: from org.jruby.ext.set.RubySet$INVOKER$i$0$0$inspect.call(RubySet$INVOKER$i$0$0$inspect.gen)
2: from org.jruby.ext.set.RubySet.inspect(RubySet.java:1096)
1: from org.jruby.ext.set.RubySet.size(RubySet.java:1177)
Java::JavaLang::NullPointerException ()
My environment info:
JRuby version: jruby 9.2.0.0 (2.5.0) 2018-05-24 81156a8 Java HotSpot(TM) 64-Bit Server VM 25.121-b13 on 1.8.0_121-b13 +jit [darwin-x86_64]
Operating system version: Darwin MoMac 17.6.0 Darwin Kernel Version 17.6.0: Tue May 8 15:22:16 PDT 2018; root:xnu-4570.61.1~1/RELEASE_X86_64 x86_64