【发布时间】：2015-02-04 09:04:13
【问题描述】：
我们正在迁移到新服务器，并决定将我们的 Solr 版本从 4.7.* 升级到 4.10.3。所以，这是我到目前为止所做的：
安装后（openjdk7、jetty），我将文件夹 /var/local/solr/solr 复制到 /var/local/solr/instance。然后我复制了 collection1 文件夹并将其命名为 myproject。然后，我在 solr.xml 中添加了一个新的核心“myproject”。无论如何，直到此时，重新启动 Jetty 后，我可以在 http://example.com:8983/solr/#/myproject/ 加载 solr 管理员
接下来我想设置一个数据导入处理程序。如果我从管理员转到“数据导入”（/dataimport），它会告诉我“抱歉，没有定义数据导入处理程序！”所以我接下来尝试定义一个数据导入处理程序：
在 solrconfig.xml 中，我添加了：
<requestHandler name="/dataimport" class="org.apache.solr.handler.dataimport.DataImportHandler">
<lst name="defaults">
<str name="config">data-config.xml</str>
</lst>
</requestHandler>
然后在/conf目录下创建如下data-import.xml文件：
<dataConfig>
<dataSource type="JdbcDataSource"
driver="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost/mydb"
user="myuser"
password="mypw"/>
<document>
<entity
name="questions"
pk="id"
query="select id,title,content from questions"
deltaImportQuery="select id,title,content from questions where id='${dih.delta.id}'"
deltaQuery="select id from questions where updated_at > '${dih.last_index_time}'"
>
</entity>
</document>
</dataConfig>
我尝试密切关注该指南，但似乎每次添加上述内容然后重新启动 Jetty 时，都会出现以下错误。我对此很陌生，所以不能真正理解它告诉我的内容。我究竟做错了什么？这与我们在早期版本的 solr 中的配置相同，该错误似乎仅在我尝试添加数据导入处理程序时发生。
HTTP ERROR 500
Problem accessing /solr/. Reason:
{msg=SolrCore 'myproject' is not available due to init failure: RequestHandler init failure,trace=org.apache.solr.common.SolrException: SolrCore 'myproject' is not available due to init failure: RequestHandler init failure
at org.apache.solr.core.CoreContainer.getCore(CoreContainer.java:745)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:307)
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:368)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
at org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:942)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1004)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:640)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
at org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
at org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.solr.common.SolrException: RequestHandler init failure
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:881)
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:654)
at org.apache.solr.core.CoreContainer.create(CoreContainer.java:491)
at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:255)
at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:249)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
... 1 more
Caused by: org.apache.solr.common.SolrException: RequestHandler init failure
at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:172)
at org.apache.solr.core.SolrCore.<init>(SolrCore.java:800)
... 8 more
Caused by: org.apache.solr.common.SolrException: Error loading class 'org.apache.solr.handler.dataimport.DataImportHandler'
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:490)
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:421)
at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:551)
at org.apache.solr.core.SolrCore.createRequestHandler(SolrCore.java:624)
at org.apache.solr.core.RequestHandlers.initHandlersFromConfig(RequestHandlers.java:158)
... 9 more
Caused by: java.lang.ClassNotFoundException: org.apache.solr.handler.dataimport.DataImportHandler
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:789)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:274)
at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:474)
... 13 more
,code=500}
【问题讨论】：