java - 使用数据导入处理程序运行 solr 的 cargo 上出现 ClassCastException

Question

我在使用 Cargo-maven2-plugin 运行 Solr 4.3.1 时遇到问题。修复所有类路径问题后，我最终出现以下错误:

ERROR org.apache.solr.core.CoreContainer - null:org.apache.solr.common.SolrException: Unable to create core: collection1
    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)
    <...>
Caused by: org.apache.solr.common.SolrException: RequestHandler init failure
    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: RequestHandler init failure
    at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:168)
    at org.apache.solr.core.SolrCore.<init>(SolrCore.java:758)
    ... 13 more
Caused by: org.apache.solr.common.SolrException: Error Instantiating Request Handler, org.apache.solr.handler.dataimport.DataImportHandler failed to instantiate org.apache.solr.request.SolrRequestHandler
    at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:539)
    at org.apache.solr.core.SolrCore.createRequestHandler(SolrCore.java:592)
    at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:154)
    ... 14 more
Caused by: java.lang.ClassCastException: class org.apache.solr.handler.dataimport.DataImportHandler
    at java.lang.Class.asSubclass(Class.java:3037)
    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)
    ... 16 more

我尝试过使用 tomcat7x 和 jetty7x 容器。如果这是一个类加载器问题，我可以以某种方式强制容器使用与 Maven 使用相同的类加载器吗？

Answer 1

通过 Google 搜索查看堆栈跟踪

Error Instantiating Request Handler, \
org.apache.solr.handler.dataimport.DataImportHandler \
failed to instantiate org.apache.solr.request.SolrRequestHandl

这就提出了以下问题。

Why can't I instantiate DataImportHandler in Solr on JBoss?

有很多答案应该有助于解决该问题。