AutoCloseInputStream.read() throws IOException after autoclose
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Key: IO-228
URL: https://issues.apache.org/jira/browse/IO-228
Project: Commons IO
Issue Type: Bug
Components: Streams/Writers
Affects Versions: 1.4
Environment: Apple Inc. Java HotSpot(TM) 64-Bit Server VM 1.6.0_17;
Mac OS X 10.5.8 (x86_64)
Reporter: Brett Johnson
A custom reported a problem, wherein our product was catching and logging many
IOExceptions. Upon examining the logs I see:
java.io.IOException: Attempted read on closed stream.
at
org.apache.commons.httpclient.AutoCloseInputStream.isReadAllowed(AutoCloseInputStream.java:183)
at
org.apache.commons.httpclient.AutoCloseInputStream.read(AutoCloseInputStream.java:107)
at java.io.FilterInputStream.read(FilterInputStream.java:116)
at
com.acme.DocPusher$BigEmptyDocumentFilterInputStream.read(DocPusher.java:679)
at
com.acme.CompressedFilterInputStream.fillbuff(CompressedFilterInputStream.java:96)
at
com.acme.CompressedFilterInputStream.read(CompressedFilterInputStream.java:67)
at
com.acme.Base64FilterInputStream.fillbuff(Base64FilterInputStream.java:138)
at
com.acme.Base64FilterInputStream.read(Base64FilterInputStream.java:115)
at java.io.FilterInputStream.read(FilterInputStream.java:116)
at
com.acme.DocPusher$AlternateContentFilterInputStream.read(DocPusher.java:609)
...
As you can see, this is a pipeline consisting of multiple FilterInputStream
segments that process data flowing through the pipeline. The source of the
data is in InputStream provided by a third party plug-in component. In our
customer's situation, that InputStream is a AutoCloseInputStream returned by a
Sharepoint API call.
When I saw the "Attempted read on closed stream.", I was incredulous; "Reading
from a closed stream - that's a rookie mistake." However, when examining the
JavaDoc for AutoCloseInputStream, I read: [emphasis mine]
"Proxy stream that closes and discards the underlying stream *as soon as the
end of input has been reached* or when the stream is explicitly closed."
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