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From "Massimilian Mattetti" <MASSI...@il.ibm.com>
Subject Re: java.lang.NoClassDefFoundError with fields of custom Filter
Date Thu, 07 Jul 2016 16:56:06 GMT
Thanks for your prompt response, you are right Jim. There is a static 
dependency to Log4J in my lexicoder. Adding the Log4J Jar to the classpath 
solved the problem.
Would you suggest to use an Uber Jar to avoid this kind of problems?

Regards,
Massimiliano




From:   James Hughes <jnh5y@virginia.edu>
To:     user@accumulo.apache.org
Date:   07/07/2016 06:25 PM
Subject:        Re: java.lang.NoClassDefFoundError with fields of custom 
Filter



Hi Massimilian, 

As a quick note, your error says that it could not initialize class 
accumulo.lexicoders.MyLexicoder.  Did you provide all the dependencies for 
your class on Accumulo's classpath?  

That exception (or similar) can occur if there is a static block in your 
MyLexicoder class which can't run properly.

Cheers,

Jim


On Thu, Jul 7, 2016 at 11:19 AM, Massimilian Mattetti <MASSIMIL@il.ibm.com
> wrote:
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/extof 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






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