Hi Hoss,
I created a wrapper class, compiled a jar and included an
org.apache.lucene.codecs.Codec file in META-INF/services in the jar file
with an entry for the wrapper class :HTPostingsFormatWrapper. I created a
collection1/lib directory and put the jar there. (see below)
I'm getting the dread "ClassCastException Class.asSubclass(Unknown Source"
error (See below).
This is looking like a complex classloader issues. Should I put the file
somewhere else and/or declare a lib directory in solrconfig.xml?
Any suggestions on how to troubleshoot this?.
Tom
--------------------
error:
by: java.lang.ClassCastException: class
org.apache.lucene.codecs.HTPostingsFormatWrapper
at java.lang.Class.asSubclass(Unknown Source)
at org.apache.lucene.util.SPIClassIterator.next(SPIClassIterator.java:141)
-------------------
Contents of the jar file:
C:\d\solr\lucene_solr_4_10_2\solr\example\solr\collection1\lib>jar -tvf
HTPostingsFormatWrapper.jar
25 Thu Mar 12 10:37:04 EDT 2015 META-INF/MANIFEST.MF
1253 Thu Mar 12 10:37:04 EDT 2015
org/apache/lucene/codecs/HTPostingsFormatWrapper.class
1276 Thu Mar 12 10:49:06 EDT 2015
META-INF/services/org.apache.lucene.codecs.Codec
----------------
Contents of META-INF/services/org.apache.lucene.codecs.Codec in the jar
file:
org.apache.lucene.codecs.lucene49.Lucene49Codec
org.apache.lucene.codecs.lucene410.Lucene410Codec
# tbw adds custom wrapper here per Hoss e-mail
org.apache.lucene.codecs.HTPostingsFormatWrapper
-------------------------
log file excerpt with stack trace:
12821 [main] INFO org.apache.solr.core.CoresLocator – Looking for core
definitions underneath C:\d\solr\lucene_solr_4_10_2\solr\example\solr
12838 [main] INFO org.apache.solr.core.CoresLocator – Found core
collection1 in C:\d\solr\lucene_solr_4_10_2\solr\example\solr\collection1\
12839 [main] INFO org.apache.solr.core.CoresLocator – Found 1 core
definitions
12841 [coreLoadExecutor-5-thread-1] INFO
org.apache.solr.core.SolrResourceLoader – new SolrResourceLoader for
directory: 'C:\d\solr\lucene_solr_4_10_2\solr\example\solr\collection1\'
12842 [coreLoadExecutor-5-thread-1] INFO
org.apache.solr.core.SolrResourceLoader – Adding
'file:/C:/d/solr/lucene_solr_4_10_2/solr/example/solr/collection1/lib/HTPostingsFormatWrapper.jar'
to classloader
12870 [coreLoadExecutor-5-thread-1] ERROR
org.apache.solr.core.CoreContainer – Error creating core [collection1]:
class org.apache.lucene.codecs.HTPostingsFormatWrapper
java.lang.ClassCastException: class
org.apache.lucene.codecs.HTPostingsFormatWrapper
at java.lang.Class.asSubclass(Unknown Source)
at org.apache.lucene.util.SPIClassIterator.next(SPIClassIterator.java:141)
at org.apache.lucene.util.NamedSPILoader.reload(NamedSPILoader.java:65)
at org.apache.lucene.codecs.Codec.reloadCodecs(Codec.java:119)
at
org.apache.solr.core.SolrResourceLoader.reloadLuceneSPI(SolrResourceLoader.java:206)
at
org.apache.solr.core.SolrResourceLoader.<init>(SolrResourceLoader.java:142)
at
org.apache.solr.core.ConfigSetService$Default.createCoreResourceLoader(ConfigSetService.java:144)
at org.apache.solr.core.ConfigSetService.getConfig(ConfigSetService.java:58)
at org.apache.solr.core.CoreContainer.create(CoreContainer.java:489)
at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:255)
at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:249)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
On Wed, Jan 14, 2015 at 6:05 PM, Chris Hostetter <hossman_luc...@fucit.org>
wrote:
>
> : As a foolish dev (not malicious I hope!), I did mess around with
> something
> : like this once; I was writing my own Codec. I found I had to create a
> file
> : called META-INF/services/org.apache.lucene.codecs.Codec in my solr
> plugin jar
> : that contained the fully-qualified class name of my codec: I guess this
> : registers it with the SPI framework so it can be found by name? I'm not
>
> Yep, that's how SPI works - the important bits are mentioned/linked in the
> PostingsFormat (and other SPI related classes in lucene) javadocs...
>
>
> https://lucene.apache.org/core/4_10_2/core/org/apache/lucene/codecs/PostingsFormat.html
>
>
> https://docs.oracle.com/javase/7/docs/api/java/util/ServiceLoader.html?is-external=true
>
>
>
>
>
> -Hoss
> http://www.lucidworks.com/
>
