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Type:
Bug
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Resolution: Fixed
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: BSON
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None
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Minor Change
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None
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None
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None
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None
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None
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None
In MRI the following works:
irb(main):001:0> Hash.from_bson({}.to_bson)
=> {}
This is because read and write positions in the buffer are tracked separately, and when from_bson is called the write position is at the end of the buffer but the read position is at the beginning.
In JRuby the same operation fails:
irb(main):001:0> Hash.from_bson({}.to_bson)
Traceback (most recent call last):
16: from org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:72)
15: from org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:317)
14: from org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:170)
13: from org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:339)
12: from org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:200)
11: from org.jruby.internal.runtime.methods.MixedModeIRMethod.call(MixedModeIRMethod.java:158)
10: from org.jruby.internal.runtime.methods.MixedModeIRMethod.INTERPRET_METHOD(MixedModeIRMethod.java:171)
9: from org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:86)
8: from org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:72)
7: from org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:346)
6: from org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:139)
5: from org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:318)
4: from org.bson.ByteBuf$INVOKER$i$0$0$getCString.call(ByteBuf$INVOKER$i$0$0$getCString.gen)
3: from org.bson.ByteBuf.getCString(ByteBuf.java:257)
2: from java.nio.HeapByteBuffer.get(HeapByteBuffer.java:135)
1: from java.nio.Buffer.nextGetIndex(Buffer.java:500)
Java::JavaNio::BufferUnderflowException ()
I presume this is because both positions are updated together (or only a single position is tracked), and thus when from_bson is called the buffer is already consumed/exhausted.
