通过Solr 4.7.2索引Excel xlsx格式文件时出现异常

Question

我通过Solr4.7.2 Search API索引excel表的xslx扩展时遇到异常。

org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [default] in context with path [/solr] threw exception [Filter execution threw an exception] with root cause
java.lang.NoClassDefFoundError: Could not initialize class org.apache.poi.openxml4j.opc.internal.unmarshallers.PackagePropertiesUnmarshaller
    at org.apache.poi.openxml4j.opc.OPCPackage.init(OPCPackage.java:154)
    at org.apache.poi.openxml4j.opc.OPCPackage.<init>(OPCPackage.java:141)
    at org.apache.poi.openxml4j.opc.Package.<init>(Package.java:54)
    at org.apache.poi.openxml4j.opc.ZipPackage.<init>(ZipPackage.java:99)
    at org.apache.poi.openxml4j.opc.OPCPackage.open(OPCPackage.java:221)
    at org.apache.tika.parser.pkg.ZipContainerDetector.detectOfficeOpenXML(ZipContainerDetector.java:194)
    at org.apache.tika.parser.pkg.ZipContainerDetector.detectZipFormat(ZipContainerDetector.java:134)
    at org.apache.tika.parser.pkg.ZipContainerDetector.detect(ZipContainerDetector.java:77)
    at org.apache.tika.detect.CompositeDetector.detect(CompositeDetector.java:61)
    at org.apache.tika.parser.AutoDetectParser.parse(AutoDetectParser.java:113)
    at org.apache.solr.handler.extraction.ExtractingDocumentLoader.load(ExtractingDocumentLoader.java:219)
    at org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:74)
    at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
    at org.apache.solr.core.RequestHandlers$LazyRequestHandlerWrapper.handleRequest(RequestHandlers.java:241)
    at org.apache.solr.core.SolrCore.execute(SolrCore.java:1916)
    at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:768)
    at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:415)
    at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:205)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)

我的tomcat lib中有4个与此Excel表相关的Apache POI Jars，它们是：poi-3.9-20121203.jar，poi-ooxml-3.9-20121203.jar，poi-ooxml-schemas-3.9-20121203.jar，poi -scratchpad-3.9-20121203.jar

我已检查并发现不同版本的POI Jars的使用以不同方式支持扩展。

请提出一些解决此问题的方法。

Answer 1

我有同样的问题，它是由两个dom4j jar引起的，一个在tomcat / lib中，另一个在webapps / basic-services / WEB-INF / lib中解决方案是使用maven从我的app依赖项中排除dom4j

<dependency>
    <groupId>dom4j</groupId>
    <artifactId>dom4j</artifactId>
    <version>1.6.1</version>
    <scope>provided</scope>
</dependency>

我能够通过调查第一次出现此异常的堆栈跟踪来查明此问题，我发现了以下内容：

Caused by: java.lang.ClassCastException: org.dom4j.DocumentFactory cannot be cast to org.dom4j.DocumentFactory
    at org.dom4j.DocumentFactory.getInstance(DocumentFactory.java:97)
    at org.dom4j.tree.AbstractNode.<clinit>(AbstractNode.java:39)