How to fix java RuntimeException: Can't find resource 'solrconfig.xml' in classpath?

I'm having issues setting up Solr as Tomcat service in CentOS. I’m using solr 3.3.0 which should be working with Tomcat 5.5 installed from cPanel. The error I was getting is:

Can't find resource 'solrconfig.xml' in classpath or '/home/sampleuser/public_html/apache-solr/example/solr/./conf/', cwd=/usr/local/jakarta/apache-tomcat-5.5.33/bin

I saw other people having similar issues. I googled and tried to apply all of the approaches. However nothing worked for me so far.

I did the following:

1. Copied solr.war to tomcat/webapps
2. Restarted Tomcat Service

3. Edited /usr/local/jakarta/tomcat/webapps/solr/WEB-INF/web.xml as:

   <env-entry>
    <env-entry-name>solr/home</env-entry-name>
    <env-entry-value>/home/sampleuser/public_html/apache-solr/example/solr</env-entry-value>
    <env-entry-type>java.lang.String</env-entry-type>
   </env-entry>
   

4. Created solr.xml in /usr/local/jakarta/tomcat/conf/Catalina/localhost as:

   <?xml version="1.0" encoding="utf-8"?> 
   <Context docBase="/usr/local/jakarta/tomcat/webapps/solr.war" debug="0" crossContext="true">
     <Environment name="solr/home" type="java.lang.String"    
          value="/home/sampleuser/public_html/apache-solr/example"override="true"/>
   </Context>
   

5. Edited tomcat startup script at etc/init.d (not sure if I had to do it at all) with:

export JAVA_OPTS="$JAVA_OPTS -Dsolr.solr.home=/home/sampleuser/public_html/apache-solr/example/solr"

Below is the complete error log from catalina.err:

Oct 9, 2011 7:35:06 PM org.apache.catalina.core.StandardService stop 
INFO: Stopping service Catalina 
Oct 9, 2011 7:35:06 PM org.apache.catalina.core.ApplicationContext log 
INFO: SessionListener: contextDestroyed() 
Oct 9, 2011 7:35:06 PM org.apache.catalina.core.ApplicationContext log 
INFO: ContextListener: contextDestroyed() 
Oct 9, 2011 7:35:06 PM org.apache.catalina.core.ApplicationContext log 
INFO: SessionListener: contextDestroyed() 
Oct 9, 2011 7:35:06 PM org.apache.catalina.core.ApplicationContext log 
INFO: ContextListener: contextDestroyed() 
Oct 9, 2011 7:35:06 PM org.apache.coyote.http11.Http11BaseProtocol destroy 
INFO: Stopping Coyote HTTP/1.1 on http-8080 
Oct 9, 2011 7:35:21 PM org.apache.catalina.core.AprLifecycleListener init 
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/local/jdk/jre/lib/amd64/server:/usr/local/jdk/jre/lib/amd64:/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib 
Oct 9, 2011 7:35:23 PM org.apache.coyote.http11.Http11BaseProtocol init 
INFO: Initializing Coyote HTTP/1.1 on http-8080 
Oct 9, 2011 7:35:23开发者_JS百科 PM org.apache.catalina.startup.Catalina load 
INFO: Initialization processed in 2875 ms 
Oct 9, 2011 7:35:23 PM org.apache.catalina.core.StandardService start 
INFO: Starting service Catalina 
Oct 9, 2011 7:35:23 PM org.apache.catalina.core.StandardEngine start 
INFO: Starting Servlet Engine: Apache Tomcat/5.5.33 
Oct 9, 2011 7:35:23 PM org.apache.catalina.core.StandardHost start 
INFO: XML validation disabled 
Oct 9, 2011 7:35:24 PM org.apache.catalina.startup.HostConfig deployDescriptor 
WARNING: A docBase /usr/local/jakarta/tomcat/webapps/solr.war inside the host appBase has been specified, and will be ignored 
Oct 9, 2011 7:35:25 PM org.apache.solr.core.SolrResourceLoader locateSolrHome 
INFO: Using JNDI solr.home: /home/sampleuser/public_html/apache-solr/example/solr 
Oct 9, 2011 7:35:25 PM org.apache.solr.core.SolrResourceLoader <init>
INFO: Solr home set to '/home/sampleuser/public_html/apache-solr/example/solr/' 
Oct 9, 2011 7:35:25 PM org.apache.solr.servlet.SolrDispatchFilter init 
INFO: SolrDispatchFilter.init() 
Oct 9, 2011 7:35:25 PM org.apache.solr.core.SolrResourceLoader locateSolrHome 
INFO: Using JNDI solr.home: /home/sampleuser/public_html/apache-solr/example/solr 
Oct 9, 2011 7:35:25 PM org.apache.solr.core.CoreContainer$Initializer initialize 
INFO: looking for solr.xml: /home/sampleuser/public_html/apache-solr/example/solr/solr.xml 
Oct 9, 2011 7:35:25 PM org.apache.solr.core.SolrResourceLoader locateSolrHome 
INFO: Using JNDI solr.home: /home/sampleuser/public_html/apache-solr/example/solr 
Oct 9, 2011 7:35:25 PM org.apache.solr.core.CoreContainer <init>
INFO: New CoreContainer: solrHome=/home/sampleuser/public_html/apache-solr/example/solr/ instance=1537767228 
Oct 9, 2011 7:35:25 PM org.apache.solr.core.SolrResourceLoader <init>
INFO: Solr home set to '/home/sampleuser/public_html/apache-solr/example/solr/' 
Oct 9, 2011 7:35:26 PM org.apache.solr.core.SolrResourceLoader <init>
INFO: Solr home set to '/home/sampleuser/public_html/apache-solr/example/solr/./' 
Oct 9, 2011 7:35:26 PM org.apache.solr.common.SolrException log 
SEVERE: java.lang.RuntimeException: Can't find resource 'solrconfig.xml' in classpath or '/home/sampleuser/public_html/apache-solr/example/solr/./conf/', cwd=/usr/local/jakarta/apache-tomcat-5.5.33/bin 
        at org.apache.solr.core.SolrResourceLoader.openResource(SolrResourceLoader.java:268) 
        at org.apache.solr.core.SolrResourceLoader.openConfig(SolrResourceLoader.java:234) 
        at org.apache.solr.core.Config.<init>(Config.java:141) 
        at org.apache.solr.core.SolrConfig.<init>(SolrConfig.java:131) 
        at org.apache.solr.core.CoreContainer.create(CoreContainer.java:435) 
        at org.apache.solr.core.CoreContainer.load(CoreContainer.java:316) 
        at org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:133) 
        at org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:94) 
        at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:221) 
        at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:302) 
        at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:78) 
        at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3666) 
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4258) 
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760) 
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740) 
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544) 
        at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:634) 
        at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:561) 
        at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:496) 
        at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1203) 
        at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:319) 
        at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120) 
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022) 
        at org.apache.catalina.core.StandardHost.start(StandardHost.java:736) 
        at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014) 
        at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443) 
        at org.apache.catalina.core.StandardService.start(StandardService.java:448) 
        at org.apache.catalina.core.StandardServer.start(StandardServer.java:700) 
        at org.apache.catalina.startup.Catalina.start(Catalina.java:552) 
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
        at java.lang.reflect.Method.invoke(Method.java:597) 
        at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295) 
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
        at java.lang.reflect.Method.invoke(Method.java:597) 
        at org.apache.commons.daemon.support.DaemonLoader.start(DaemonLoader.java:219) 

Oct 9, 2011 7:35:26 PM org.apache.solr.servlet.SolrDispatchFilter init 
INFO: user.dir=/usr/local/jakarta/apache-tomcat-5.5.33/bin 
Oct 9, 2011 7:35:26 PM org.apache.solr.servlet.SolrDispatchFilter init 
INFO: SolrDispatchFilter.init() done 
Oct 9, 2011 7:35:26 PM org.apache.solr.servlet.SolrServlet init 
INFO: SolrServlet.init() 
Oct 9, 2011 7:35:26 PM org.apache.solr.core.SolrResourceLoader locateSolrHome 
INFO: Using JNDI solr.home: /home/sampleuser/public_html/apache-solr/example/solr 
Oct 9, 2011 7:35:26 PM org.apache.solr.servlet.SolrServlet init 
INFO: SolrServlet.init() done 
Oct 9, 2011 7:35:26 PM org.apache.solr.core.SolrResourceLoader locateSolrHome 
INFO: Using JNDI solr.home: /home/sampleuser/public_html/apache-solr/example/solr 
Oct 9, 2011 7:35:26 PM org.apache.solr.servlet.SolrUpdateServlet init 
INFO: SolrUpdateServlet.init() done 

When I copy the missing path via shell I was able to navigate just fine. Seem like Tomcat cannot locate the solrconfig.xml.

First off: you don't need to #3 and #4 and 5. #3 isn't really recommended unless you are explicitly customizing the solr.war. #4 and #5 are two different ways to do the same thing - use whichever one is most convenient for you (JNDI vs system properties)

Second: please note that while #3 and #5 are consistent, in #4 you actually specify a different Solr home dir (the parent dir of what you really want)

Third: I think the crux of your problem is file permissions.

The logging is a bit confusing due to SOLR-3264 which causes "instanceDirs" for each core to be refered to erroneously as "Solr Home" but what seems to be happening is that it can't find (or read) your "/home/sampleuser/public_html/apache-solr/example/solr/solr.xml" so it's going into legacy "Single Core" mode where it assumes that you want to use your Solr Home dir as an instanceDir for a (single) Solr Core -- so it then looks for "/home/sampleuser/public_html/apache-solr/example/solr/solrconf.xml" and if it can't find (or read) that file it gives up.

So depending on whether your main concern is that you actually have a solr.xml (pointing to alternate instanceDirs) hat it's not finding, or if you actually have a solrconfig.xml file where it's looking, check the file permissions of those files (and their directories), and make sure they are readable by the effective user of your tomcat server.

(FWIW: Solr 3.6 and up will have better logging when solr.xml is not found and legacy mode is used, and I've opened SOLR-3266 to pursue better ways of logging/erroring on unreadable files in the future)