milleruntime commented on issue #1976:
URL: https://github.com/apache/accumulo/issues/1976#issuecomment-808507891
The obfuscation in the classloading code makes it difficult to debug what is
going on. I was seeing a null context on the server side but I think that was a
red herring as it appears it wasn't making it to the server code. I finally
just printed the exception in the shell:
<pre>
java.lang.ClassNotFoundException: org.apache.accumulo.test.FooFilter
at java.net.URLClassLoader.findClass(URLClassLoader.java:471) ~[?:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:589) ~[?:?]
at
org.apache.accumulo.start.classloader.AccumuloClassLoader$1.loadClass(AccumuloClassLoader.java:212)
~[accumulo-start-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[?:?]
at
org.apache.accumulo.shell.commands.SetIterCommand.setUpOptions(SetIterCommand.java:211)
~[accumulo-shell-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at
org.apache.accumulo.shell.commands.SetIterCommand.execute(SetIterCommand.java:103)
~[accumulo-shell-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at org.apache.accumulo.shell.Shell.execCommand(Shell.java:779)
~[accumulo-shell-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at org.apache.accumulo.shell.Shell.start(Shell.java:598)
~[accumulo-shell-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at org.apache.accumulo.shell.Shell.execute(Shell.java:528)
~[accumulo-shell-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
at org.apache.accumulo.start.Main.lambda$execKeyword$0(Main.java:126)
~[accumulo-start-2.1.0-SNAPSHOT.jar:2.1.0-SNAPSHOT]
</pre>
I am not sure why the URLClassLoader is being used in this case as I would
assume DefaultContextClassLoaderFactory would be the default.
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