Ok, let me revise my previous report: It turns out if I take the single-core or multicore example stuff from running "ant example" on r815830 and plop them into Tomcat, this doesn't hang. However, if I plop Solr as I configure it for production use into Tomcat, it does hang.
The main ways I can think of how my Solr conf differs from the example configs are the use of ExtractingRequestHandler and of the Solr qsol patch (https://issues.apache.org/jira/browse/SOLR-896). As an experiment, I tried removing apache-solr-cell-1.4-dev.jar and apache-solr-qsol-1.4-dev.jar from my Solr lib directory, and removing reference to qsol from my solrconfig.xml, but this does not prevent Solr from hanging in Tomcat; in this case Tomcat hung in the same spot as I reported before. I did find one way to get my production-like Solr configuration not to hang on startup. That was to 1) remove apache-solr-qsol-1.4-dev.jar from my lib/ directory, but to 2) still leave this config option in my solrconfig.xml: <queryParser name="qsol" class="org.apache.solr.search.QsolQParserPlugin"/> Something about the class loading exception seems to get around the bean issue. Here's an excerpt from my Tomcat log: ... Sep 17, 2009 12:01:22 PM org.apache.solr.core.SolrCore <init> INFO: [filingcore] Opening new SolrCore at c:\tomcat-solr\solrme\filingcore\, dataDir=c:\tomcat-solr\solrme\filingcore\data\ Sep 17, 2009 12:01:22 PM org.apache.solr.core.JmxMonitoredMap <init> INFO: JMX monitoring is enabled. Adding Solr mbeans to JMX Server: com.sun.jmx.mbeanserver.jmxmbeanser...@ecb67f Sep 17, 2009 12:01:22 PM org.apache.solr.core.SolrCore initListeners INFO: [filingcore] Added SolrEventListener: org.apache.solr.core.QuerySenderListener{queries=[{q=*:*,sort=date asc,companynameforsorting asc,formtype asc,start=0,rows=10}]} Sep 17, 2009 12:01:22 PM org.apache.solr.core.SolrCore initListeners INFO: [filingcore] Added SolrEventListener: org.apache.solr.core.QuerySenderListener{queries=[{q=*:*,sort=date asc,companynameforsorting asc,formtype asc,start=0,rows=10}]} Sep 17, 2009 12:01:22 PM org.apache.solr.request.XSLTResponseWriter init INFO: xsltCacheLifetimeSeconds=5 Sep 17, 2009 12:01:22 PM org.apache.solr.core.SolrCore finalize SEVERE: REFCOUNT ERROR: unreferenced org.apache.solr.core.solrc...@4eeaaf (filingcore) has a reference count of 1 Sep 17, 2009 12:01:22 PM org.apache.solr.common.SolrException log SEVERE: org.apache.solr.common.SolrException: Error loading class 'org.apache.solr.search.QsolQParserPlugin' at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:311) at org.apache.solr.core.SolrCore.createInstance(SolrCore.java:411) at org.apache.solr.core.SolrCore.initPlugins(SolrCore.java:1479) at org.apache.solr.core.SolrCore.initQParsers(SolrCore.java:1433) at org.apache.solr.core.SolrCore.<init>(SolrCore.java:533) at org.apache.solr.core.CoreContainer.create(CoreContainer.java:425) at org.apache.solr.core.CoreContainer.load(CoreContainer.java:278) at org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:117) at org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:83) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275) at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3800) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4450) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:630) at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:556) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:491) at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1206) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053) at org.apache.catalina.core.StandardHost.start(StandardHost.java:722) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443) at org.apache.catalina.core.StandardService.start(StandardService.java:516) at org.apache.catalina.core.StandardServer.start(StandardServer.java:710) at org.apache.catalina.startup.Catalina.start(Catalina.java:583) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413) Caused by: java.lang.ClassNotFoundException: org.apache.solr.search.QsolQParserPlugin at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.net.FactoryURLClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClassInternal(Unknown Source) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:295) ... 35 more Sep 17, 2009 12:01:22 PM org.apache.solr.servlet.SolrDispatchFilter init INFO: user.dir=C:\tomcat Sep 17, 2009 12:01:22 PM org.apache.solr.servlet.SolrDispatchFilter init INFO: SolrDispatchFilter.init() done Sep 17, 2009 12:01:22 PM org.apache.solr.servlet.SolrServlet init INFO: SolrServlet.init() Sep 17, 2009 12:01:22 PM org.apache.solr.core.SolrResourceLoader locateSolrHome INFO: Using JNDI solr.home: c:\tomcat-solr\solrme Sep 17, 2009 12:01:22 PM org.apache.solr.servlet.SolrServlet init INFO: SolrServlet.init() done Sep 17, 2009 12:01:22 PM org.apache.solr.core.SolrResourceLoader locateSolrHome INFO: Using JNDI solr.home: c:\tomcat-solr\solrme Sep 17, 2009 12:01:22 PM org.apache.solr.servlet.SolrUpdateServlet init INFO: SolrUpdateServlet.init() done Sep 17, 2009 12:01:22 PM org.apache.coyote.http11.Http11Protocol start INFO: Starting Coyote HTTP/1.1 on http-9000 Sep 17, 2009 12:01:22 PM org.apache.jk.common.ChannelSocket init INFO: JK: ajp13 listening on /0.0.0.0:8009 Sep 17, 2009 12:01:22 PM org.apache.jk.server.JkMain start INFO: Jk running ID=0 time=0/32 config=null Sep 17, 2009 12:01:22 PM org.apache.catalina.startup.Catalina start INFO: Server startup in 2709 ms 2009/9/17 Chris Harris <rygu...@gmail.com>: > I found what looks like the same issue when I tried to install r815830 > under Tomcat. (It works ok with the normal Jetty example/start.jar.) I > haven't checked the stack trace, but Tomcat would hang right after the > message > > INFO: Adding debug > component:org.apache.solr.handler.component.debugcompon...@1904e0d > > showed up in the log. > > I have a little more evidence about Yonik's theory that SOLR-1427 is > part of the cause. In particular, when I reverse-merged r815587 (the > commit for SOLR-1427) into (out of?) my r815830-based working copy, > then Tomcat was able to load Solr normally.
