Hi,
I have implemented a custom filter and a custom lexicoder. Both this two
classes are packed in the same jar that has been deployed under the
directory $ACCUMULO_HOME/lib/ext of my Accumulo servers (version 1.7.1).
The lexicoder is used by the filter to get the real object from the
accumulo value and test some conditions on it. When I tried to scan the
table applying this filter I got the following exception:
Caused by: java.lang.NoClassDefFoundError: Could not initialize class
accumulo.lexicoders.MyLexicoder
at accumulo.filters.MyFilter.<init>(MyFilter.java:24)
at sun.reflect.GeneratedConstructorAccessor9.newInstance(Unknown
Source)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at java.lang.Class.newInstance(Class.java:442)
at
org.apache.accumulo.core.iterators.IteratorUtil.loadIterators(IteratorUtil.java:261)
at
org.apache.accumulo.core.iterators.IteratorUtil.loadIterators(IteratorUtil.java:237)
at
org.apache.accumulo.core.iterators.IteratorUtil.loadIterators(IteratorUtil.java:218)
at
org.apache.accumulo.core.iterators.IteratorUtil.loadIterators(IteratorUtil.java:205)
at
org.apache.accumulo.tserver.tablet.ScanDataSource.createIterator(ScanDataSource.java:193)
at
org.apache.accumulo.tserver.tablet.ScanDataSource.iterator(ScanDataSource.java:127)
at
org.apache.accumulo.core.iterators.system.SourceSwitchingIterator.seek(SourceSwitchingIterator.java:180)
at
org.apache.accumulo.tserver.tablet.Tablet.nextBatch(Tablet.java:880)
at
org.apache.accumulo.tserver.tablet.Scanner.read(Scanner.java:98)
at
org.apache.accumulo.tserver.scan.NextBatchTask.run(NextBatchTask.java:69)
at
org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
... 4 more
I do not undestand how it is possible that the class loader is able to
find the filter and no the lexicoder. Am I missing something?
Thanks,
Massimiliano
