尝试在solr中应用自定义过滤器时发生ClassCastException [英] ClassCastException when trying to apply custom filter in solr
问题描述
我正在使用4.10.3 solr，并在使用Filter实现Factory后
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.util.TokenFilterFactory;
import java.util.Map;
public class CustomFilterFactory extends TokenFilterFactory {
protected CustomFilterFactory(Map<String, String> args) {
super(args);
}
@Override
public TokenStream create(TokenStream tokenStream) {
return new CustomFilter(tokenStream);
}
}
当Solr启动时，我在日志中收到奇怪的错误:
Caused by:
java.lang.ClassCastException: class org.apache.lucene.analysis.tr.ApostropheFilterFactory
at java.lang.Class.asSubclass(Class.java:3116)
at org.apache.lucene.util.SPIClassIterator.next(SPIClassIterator.java:141)
at org.apache.lucene.analysis.util.AnalysisSPILoader.reload(AnalysisSPILoader.java:79)
at org.apache.lucene.analysis.util.AnalysisSPILoader.<init>(AnalysisSPILoader.java:60)
at org.apache.lucene.analysis.util.AnalysisSPILoader.<init>(AnalysisSPILoader.java:49)
at org.apache.lucene.analysis.util.TokenFilterFactory.<clinit>(TokenFilterFactory.java:31)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:270)
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:474)
at org.apache.solr.core.SolrResourceLoader.newInstance(SolrResourceLoader.java:593)
at org.apache.solr.schema.FieldTypePluginLoader$1.create(FieldTypePluginLoader.java:306)
at org.apache.solr.schema.FieldTypePluginLoader$1.create(FieldTypePluginLoader.java:299)
at org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:151)
at org.apache.solr.schema.FieldTypePluginLoader.readAnalyzer(FieldTypePluginLoader.java:325)
at org.apache.solr.schema.FieldTypePluginLoader.create(FieldTypePluginLoader.java:95)
at org.apache.solr.schema.FieldTypePluginLoader.create(FieldTypePluginLoader.java:43)
at org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:151)
at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:486)
有什么想法会导致这种状态吗?
字段定义:
<field name="ii" type="customFilter" indexed="true" stored="false" required="false" multiValued="false"/>
<fieldType name="customFilter" class="solr.TextField">
<analyzer>
<charFilter class="com.nosql.search.solr.CustomFilterFactory" />
</analyzer>
</fieldType>
我正在使用具有过滤器的自定义jar和用于启动Solr的相同Java版本.
如果删除对CustomFilterFactory的引用，它将起作用.
我在Solr 6.4中遇到了同样的问题.但是我的Solr部署在Hybris 6框架中.关键是我试图将我的自定义令牌过滤器库直接添加到solr服务器库$ {solr_instance}/server/lib中，然后我得到一个例外，即引擎可以找到父级Lucene类TokenFilterFactory.在添加了相关的jar lucene-analysers-common-x，lucene-core-x之后，我得到了与您相同的错误(java.lang.ClassCastException:类org.apache.lucene.analysis.tr.ApostropheFilterFactory)
要解决此问题，我将我的自定义jar移到了自定义文件夹$ {solr_instance}/contrib/hybris/lib，没有任何其他Lucene库.而且，我的solrconfig.xml已经有一个链接:
<lib dir="${solr.install.dir:../../../..}/contrib/hybris/lib" regex=".*\.jar" />
因此，可以得出结论，这种异常是指类路径歧义性问题，这使Solr感到困惑.
I'm using 4.10.3 solr and after I implemented Factory with Filter
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.util.TokenFilterFactory;
import java.util.Map;
public class CustomFilterFactory extends TokenFilterFactory {
protected CustomFilterFactory(Map<String, String> args) {
super(args);
}
@Override
public TokenStream create(TokenStream tokenStream) {
return new CustomFilter(tokenStream);
}
}
and when Solr starts, I'm getting strange errors in log:
Caused by:
java.lang.ClassCastException: class org.apache.lucene.analysis.tr.ApostropheFilterFactory
at java.lang.Class.asSubclass(Class.java:3116)
at org.apache.lucene.util.SPIClassIterator.next(SPIClassIterator.java:141)
at org.apache.lucene.analysis.util.AnalysisSPILoader.reload(AnalysisSPILoader.java:79)
at org.apache.lucene.analysis.util.AnalysisSPILoader.<init>(AnalysisSPILoader.java:60)
at org.apache.lucene.analysis.util.AnalysisSPILoader.<init>(AnalysisSPILoader.java:49)
at org.apache.lucene.analysis.util.TokenFilterFactory.<clinit>(TokenFilterFactory.java:31)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:270)
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:474)
at org.apache.solr.core.SolrResourceLoader.newInstance(SolrResourceLoader.java:593)
at org.apache.solr.schema.FieldTypePluginLoader$1.create(FieldTypePluginLoader.java:306)
at org.apache.solr.schema.FieldTypePluginLoader$1.create(FieldTypePluginLoader.java:299)
at org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:151)
at org.apache.solr.schema.FieldTypePluginLoader.readAnalyzer(FieldTypePluginLoader.java:325)
at org.apache.solr.schema.FieldTypePluginLoader.create(FieldTypePluginLoader.java:95)
at org.apache.solr.schema.FieldTypePluginLoader.create(FieldTypePluginLoader.java:43)
at org.apache.solr.util.plugin.AbstractPluginLoader.load(AbstractPluginLoader.java:151)
at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:486)
Any idea what could cause this state?
Field definition:
<field name="ii" type="customFilter" indexed="true" stored="false" required="false" multiValued="false"/>
<fieldType name="customFilter" class="solr.TextField">
<analyzer>
<charFilter class="com.nosql.search.solr.CustomFilterFactory" />
</analyzer>
</fieldType>
I'm using same Java version for my custom jar with filter and for starting Solr.
It works if I remove the reference to CustomFilterFactory.
I had the same issue with Solr 6.4. But my solr is deployed within the Hybris 6 framework. The point is that I tried to add my custom token filter library directly to solr server libraries ${solr_instance}/server/lib, then I got an exception that the engine could find the parent lucene class TokenFilterFactory. After the adding of the related jars lucene-analysers-common-x, lucene-core-x, I got the same error as yours (java.lang.ClassCastException: class org.apache.lucene.analysis.tr.ApostropheFilterFactory)
To resolve this I just moved my custom jar to the custom folder ${solr_instance}/contrib/hybris/lib without any additional lucene libs. Moreover my solrconfig.xml already had a link to it:
<lib dir="${solr.install.dir:../../../..}/contrib/hybris/lib" regex=".*\.jar" />
So, one can conclude that this kind of exception refers to classpath ambiguity issue, which confuses Solr.
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