Daryl Odnert created VFS-683:
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Summary: Thread safety issue in VFSClassLoader -
NullPointerException thrown
Key: VFS-683
URL: https://issues.apache.org/jira/browse/VFS-683
Project: Commons VFS
Issue Type: Bug
Affects Versions: 2.2
Reporter: Daryl Odnert
In my application, I had two instances of the {{VFSClassLoader}}, each of which
was being used in a distinct thread. Both {{VFSClassLoader}} instances refer to
the same compressed file resource described by a {{FileObject}} that is passed
to the class loader's constructor. Intermittently, the application throws an
exception with the stack trace shown below. So, there seems to be either a race
condition in the code or an undocumented assumption here. If it is unsupported
for two {{VFSClassLoader}} instances to refer to the same resource (file), then
that assumption should be documented. But if that is not the case, then there
is a race condition bug in the implementation.
{noformat}
43789 WARN {} c.a.e.u.PreferredPathClassLoader - While loading class
org.apache.hive.jdbc.HiveDatabaseMetaData, rethrowing unexpected
java.lang.NullPointerException: Inflater has been closed
java.lang.NullPointerException: Inflater has been closed
at java.util.zip.Inflater.ensureOpen(Inflater.java:389)
at java.util.zip.Inflater.inflate(Inflater.java:257)
at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:152)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:284)
at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
at
org.apache.commons.vfs2.util.MonitorInputStream.read(MonitorInputStream.java:91)
at org.apache.commons.vfs2.FileUtil.getContent(FileUtil.java:47)
at org.apache.commons.vfs2.impl.Resource.getBytes(Resource.java:102)
at
org.apache.commons.vfs2.impl.VFSClassLoader.defineClass(VFSClassLoader.java:179)
at
org.apache.commons.vfs2.impl.VFSClassLoader.findClass(VFSClassLoader.java:150)
at
com.atscale.engine.utils.PreferredPathClassLoader.findClass(PreferredPathClassLoader.scala:54)
{noformat}
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