Error Loading Custom Codec class with Solr Codec Factory. Class cast exception

[Mohit Sidana <si...@gmail.com>]

Hello,


I am trying to experiment with my solr indexes with the patch open on JIRA -
Codec for index-level encryption
<https://issues.apache.org/jira/browse/LUCENE-6966> (LUCENE-6966).
https://issues.apache.org/jira/browse/LUCENE-6966.

I am currently trying to test this Custom codec with Solr to encrypt
sensitive documents.


I have applied this patch to cloned Lucene-solr trunk (branch 6.3 on my
local machine) and used “ant compile” and “ant jar” to get the jar files.

By using this custom codec I can make use of the custom codec(Posting
-format) classes by overridden posting format in field type definations.


<fieldType name="string" class="solr.StrField" sortMissingLast="true"
docValues="true" *postingsFormat= "EncryptedLucene50"* />



But when I try to load this codec directly via Solrconfig.xml CodecFactory
as below.


<codecFactory
class="org.apache.lucene.codecs.encrypted.DummyEncryptedLucene60Codec"/>



Solr is not able to load the core and initialize the codec. I am getting
the following error in my logs.

java.util.concurrent.ExecutionException:
org.apache.solr.common.SolrException: Unable to create core [test]

        at java.util.concurrent.FutureTask.report(FutureTask.java:122)

        at java.util.concurrent.FutureTask.get(FutureTask.java:192)

        at
org.apache.solr.core.CoreContainer.lambda$load$1(CoreContainer.java:526)

        at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)

        at java.util.concurrent.FutureTask.run(FutureTask.java:266)

        at
org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:229)

        at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

        at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

        at java.lang.Thread.run(Thread.java:745)

Caused by: org.apache.solr.common.SolrException: Unable to create core
[test]

        at org.apache.solr.core.CoreContainer.create(CoreContainer.java:855)

        at
org.apache.solr.core.CoreContainer.lambda$load$0(CoreContainer.java:498)

        ... 5 more

Caused by: org.apache.solr.common.SolrException: class
com.wk.codecs.encrypted.DummyEncryptedLucene60Codec

        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:903)

        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:776)

        at org.apache.solr.core.CoreContainer.create(CoreContainer.java:842)

        ... 6 more

Caused by: java.lang.ClassCastException: class
com.wk.codecs.encrypted.DummyEncryptedLucene60Codec

        at java.lang.Class.asSubclass(Class.java:3404)

        at
org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:540)

        at
org.apache.solr.core.SolrResourceLoader.newInstance(SolrResourceLoader.java:625)

        at
org.apache.solr.core.SolrResourceLoader.newInstance(SolrResourceLoader.java:590)

        at
org.apache.solr.core.SolrResourceLoader.newInstance(SolrResourceLoader.java:583)

        at org.apache.solr.core.SolrCore.initCodec(SolrCore.java:1112)

        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:847)

        ... 8 more



I am new to solr and unable to track what is causing this error.


Is it classpath issue or something else ?



I will appreciate any feedback on this.



Thanks,

Mohit

Re: Error Loading Custom Codec class with Solr Codec Factory. Class cast exception

[Chris Hostetter <ho...@fucit.org>]

: But when I try to load this codec directly via Solrconfig.xml CodecFactory
: as below.
: 
: 
: <codecFactory
: class="org.apache.lucene.codecs.encrypted.DummyEncryptedLucene60Codec"/>

...there is a difference between a (lucene layer) Codec.  And a (solr 
layer) CodecFactory.

Having the codec code in place (with the necessary SPI metadata 
files) let's Solr/Lucene *read* indexes written in that codec, but in 
order to create new indexes with your codec, you have to write 
a concrete implementation of the CodecFactory abstract class and provide 
that *Factory* class name in your <codecFactory /> config line.  There is 
probably no CodecFactory for your DummyEncryptedLucene60Codec defined in 
the patch you're trying out.



-Hoss
http://www.lucidworks.com/