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Otto Fowler edited comment on VFS-683 at 11/22/18 10:04 PM: ------------------------------------------------------------ The things you are dealing with here: * Static FileSystemManager * Threads * Non-Thread Safe Content * Cache * Using the FileSystem abstractly ( not having to "know" the fs type ) There a number of different approaches, all with trade-offs, I'm sure you all have thought of some as well. was (Author: ottobackwards): The things you are dealing with here: * Static FileSystemManager * Threads * Non-Thread Safe Content * Cache * Using the FileSystem abstractly ( not having to "know" the fs type ) > 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 > Priority: Major > Attachments: Main.java > > > In my application, I have two instances of the {{VFSClassLoader}}, each of > which is 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} -- This message was sent by Atlassian JIRA (v7.6.3#76005)