ResourceSource.getInfos() leaves URLConnection open, resulting in 'too may open
files' condition
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Key: FORTRESS-22
URL: http://issues.apache.org/jira/browse/FORTRESS-22
Project: Excalibur Fortress
Issue Type: Bug
Components: Implementation
Affects Versions: 1.0
Environment: Sun Solaris 5.9
JDK 1.4
Cocoon 2.1.8
Reporter: Ellis Pritchard
org.apache.excalibur.source.impl.ResourceSource#getInfos() opens a
URLConnection [line 79] to obtain information about the resource, however, it
does not cause this connection to be closed (i.e. call getInputStream() and
then close() that), thus the resulting file-descriptor will only be closed when
the garbage collector collects the URLConnection object.
Quote from java.net.URLConnection javadoc:
"Calling the close() methods on the InputStream or OutputStream of an
URLConnection after a request may free network resources associated with this
instance, unless particular protocol specifications specify different
behaviours for it."
On a high-load system, which is accessing resources in jars frequently (even if
only as a side-effect of calling getValidity()), this may result in all
available file-descriptors being used within a short period, and because GC is
not kicked off when a process runs out of file-descriptors, this can result in
a DoS.
This problem has occured on a live system running Apache Cocoon 2.1.8.
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