Problem instatanting a ValueSourceParser plugin in 4.3.1

Mon, 22 Jul 2013 06:37:30 -0700 

Hi,

I'm trying to migrate to Solr 4.3.1 from Solr 4.0.0. I have a Solr Plugin which 
extends ValueSourceParser and it works under Solr 4.0.0 but does not work under 
Solr 4.3.1. I compiled the plugin using the latest solr-4.3.1*.jars and 
lucene-4.3.1*.jars but I get the following stacktrace error when starting up a 
core referencing this plugin...seen below. Does anyone know why it might be 
giving me a ClassCastException under 4.3.1?

Thanks,
Niran

2458 [coreLoadExecutor-3-thread-2] ERROR org.apache.solr.core.CoreContainer   
Unable to create core: example_core
org.apache.solr.common.SolrException: Error Instantiating ValueSourceParser, 
com.example.HitsValueSourceParser failed to instanti
ate org.apache.solr.search.ValueSourceParser
        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:821)
        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:618)
        at 
org.apache.solr.core.CoreContainer.createFromLocal(CoreContainer.java:949)
        at org.apache.solr.core.CoreContainer.create(CoreContainer.java:984)
        at org.apache.solr.core.CoreContainer$2.call(CoreContainer.java:597)
        at org.apache.solr.core.CoreContainer$2.call(CoreContainer.java:592)
        at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown 
Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.solr.common.SolrException: Error Instantiating 
ValueSourceParser, com.example.HitsValueSourceParser failed
to instantiate org.apache.solr.search.ValueSourceParser
        at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:539)
        at org.apache.solr.core.SolrCore.createInitInstance(SolrCore.java:575)
        at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:2088)
        at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:2082)
        at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:2115)
        at 
org.apache.solr.core.SolrCore.initValueSourceParsers(SolrCore.java:2027)
        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:749)
        ... 13 more
Caused by: java.lang.ClassCastException: class com.example.HitsValueSourceParser
        at java.lang.Class.asSubclass(Unknown Source)
        at 
org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:448)
        at 
org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:396)
        at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:518)
        ... 19 more
2466 [coreLoadExecutor-3-thread-2] ERROR org.apache.solr.core.CoreContainer   
null:org.apache.solr.common.SolrException: Unable to create core: example_core
        at 
org.apache.solr.core.CoreContainer.recordAndThrow(CoreContainer.java:1450)
        at org.apache.solr.core.CoreContainer.create(CoreContainer.java:993)
        at org.apache.solr.core.CoreContainer$2.call(CoreContainer.java:597)
        at org.apache.solr.core.CoreContainer$2.call(CoreContainer.java:592)
        at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown 
Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.solr.common.SolrException: Error Instantiating 
ValueSourceParser, com.example.HitsValueSourceParser failed
to instantiate org.apache.solr.search.ValueSourceParser
        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:821)
        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:618)
        at 
org.apache.solr.core.CoreContainer.createFromLocal(CoreContainer.java:949)
        at org.apache.solr.core.CoreContainer.create(CoreContainer.java:984)
        ... 10 more
Caused by: org.apache.solr.common.SolrException: Error Instantiating 
ValueSourceParser, com.example.HitsValueSourceParser failed
to instantiate org.apache.solr.search.ValueSourceParser
        at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:539)
        at org.apache.solr.core.SolrCore.createInitInstance(SolrCore.java:575)
        at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:2088)
        at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:2082)
        at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:2115)
        at 
org.apache.solr.core.SolrCore.initValueSourceParsers(SolrCore.java:2027)
        at org.apache.solr.core.SolrCore.<init>(SolrCore.java:749)
        ... 13 more
Caused by: java.lang.ClassCastException: com.example.HitsValueSourceParser
        at java.lang.Class.asSubclass(Unknown Source)
        at 
org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:448)
        at 
org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:396)
        at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:518)
        ... 19 more

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