由于第三方库的位置,启动Solr云时出错

Question

我试图迁移到Solr 3.1,我的项目使用Dataimport处理程序,当我启动solr时它问我SolrCoreAwar未找到我将以下文件复制到lib目录apache-solr-dataimporthandler-3.1-SNAPSHOT.jar但是在说明时再次出现错误solr我需要解决这个问题,如果你可以帮助谢谢你

下一条消息是我在启动Solr 3.1时获得的异常

 java.lang.NoClassDefFoundError: Could not initialize class org.slf4j.LoggerFactory
    at org.apache.solr.handler.dataimport.DataImportHandler.<clinit>(DataImportHandler.java:72)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:264)
    at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:373)
    at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:423)
    at org.apache.solr.core.SolrCore.createRequestHandler(SolrCore.java:459)
    at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:154)
    at org.apache.solr.core.SolrCore.<init>(SolrCore.java:563)
    at org.apache.solr.core.CoreContainer.create(CoreContainer.java:458)
    at org.apache.solr.core.CoreContainer.load(CoreContainer.java:316)
    at org.apache.solr.core.CoreContainer.load(CoreContainer.java:207)
    at org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:130)
    at org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:94)
    at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:713)
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282)
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
    at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.jetty.Server.doStart(Server.java:224)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.xml.XmlConfiguration.main(XmlConfiguration.java:985)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.mortbay.start.Main.invokeMain(Main.java:194)
    at org.mortbay.start.Main.start(Main.java:534)
    at org.mortbay.start.Main.start(Main.java:441)
    at org.mortbay.start.Main.main(Main.java:119

更新

我已经将以下jar文件添加到我的类路径中,之前的异常消失了,但启动solr服务器时出现了一个新错误:

 Error Instantiating Request Handler, org.apache.solr.handler.dataimport.DataImportHandler is not a org.apache.solr.request.SolrRequestHandler
    at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:425)
    at org.apache.solr.core.SolrCore.createRequestHandler(SolrCore.java:459)
    at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:154)
    at org.apache.solr.core.SolrCore.<init>(SolrCore.java:563)
    at org.apache.solr.core.CoreContainer.create(CoreContainer.java:458)
    at org.apache.solr.core.CoreContainer.load(CoreContainer.java:316)
    at org.apache.solr.core.CoreContainer.load(CoreContainer.java:207)
    at org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:130)
    at org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:94)
    at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:713)
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282)
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
    at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.jetty.Server.doStart(Server.java:224)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
        at org.mortbay.xml.XmlConfiguration.main(XmlConfiguration.java:985)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at org.mortbay.start.Main.invokeMain(Main.java:194)
    at org.mortbay.start.Main.start(Main.java:534)
    at org.mortbay.start.Main.start(Main.java:441)
    at org.mortbay.start.Main.main(Main.java:119)

Answer 1

问题现在解决了.

出现此问题是因为dataimporthandler和requesthandler由两个不同的类加载器加载.要解决此问题,请确保solr仅从同一个类加载器加载其jar.

首先,我确保:

1)在solrconfig.xml中删除确保dataimporthandler只来自一个地方2)我已经注​​释了所有指令并添加了一个引用solr目录中lib目录的新指令,因此lib目录路径是example/solr/lib,默认情况下该目录不存在.创建它(例如使用mkdir solr/lib)和lib指令solrconfig.xml成为

<lib dir="./solr/lib"/>   

3)将dist目录中的jar文件添加到此目录example/solr/lib
4)启动solr服务器

并且不要忘记将mysql-driver jar复制到include路径,以便在为此目的使用dataimporthandler时能够索引mysql数据库表

注意:这适用于solr 4.0