Building Solr as Maven Project

Now days maven is most commonly used build tool. But solr still uses ant build. In this article I am going to describe how you can quickly create Solr Maven Project and run solr using jetty.

Solr war is available in Maven Central repository(http://mvnrepository.com/artifact/org.apache.solr/solr).

Steps to build Solr Maven Project:

Create a Maven Project from eclipse using: File --> New --> Project...
1. Select Maven --> Maven Project from list
2. Check Create Simple Project
3. Specify some value in groupId and artifactId
4. Select Packaging type: war
5. Press Finish. This will create an empty maven project with basic folder structure in eclipse

Now Edit pom.xml and update it with below content:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <groupId>org.apache.mysolr</groupId>
 <artifactId>mysolr</artifactId>
 <version>3.4.0</version>
 <packaging>war</packaging>
 <name>Apache Solr Web Application</name>
 <repositories>
   <repository>
     <id>central</id>
     <name>Maven Repository Switchboard</name>
     <layout>default</layout>
     <url>http://repo1.maven.org/maven2</url>
   </repository>
 </repositories>
 <pluginRepositories>
   <pluginRepository>
     <id>central</id>
     <name>Maven Plugin Repository</name>
     <url>http://repo1.maven.org/maven2</url>
     <layout>default</layout>
   </pluginRepository>
 </pluginRepositories>
 <dependencies>
     <dependency>
       <groupId>org.apache.solr</groupId>
       <artifactId>solr</artifactId>
       <version>3.4.0</version>
       <type>war</type>
   </dependency>
</dependencies>
<build>
  <plugins>
     <plugin>
        <groupId>org.mortbay.jetty</groupId>
        <artifactId>maven-jetty-plugin</artifactId>
        <version>6.1.15.rc4</version>
     </plugin>
  </plugins>
</build>   
</project>

Copy the solr config files in the folder src/main/resources of the project.

solrconfig.xml
schema.xml
elevate.xml
protwords.txt
stopwords.txt
spellings.txt
synonyms.txt

Copy the default solr web.xml content from below to src/main/webapp/WEB-INF/web.xml


<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<!--
 Licensed to the Apache Software Foundation (ASF) under one or more
 contributor license agreements.  See the NOTICE file distributed with
 this work for additional information regarding copyright ownership.
 The ASF licenses this file to You under the Apache License, Version 2.0
 (the "License"); you may not use this file except in compliance with
 the License.  You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
-->

<web-app>
 
  <!-- Uncomment if you are trying to use a Resin version before 3.0.19.
    Their XML implementation isn't entirely compatible with Xerces.
    Below are the implementations to use with Sun's JVM.
  <system-property javax.xml.xpath.XPathFactory=
             "com.sun.org.apache.xpath.internal.jaxp.XPathFactoryImpl"/>
  <system-property javax.xml.parsers.DocumentBuilderFactory=
             "com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderFactoryImpl"/>
  <system-property javax.xml.parsers.SAXParserFactory=
             "com.sun.org.apache.xerces.internal.jaxp.SAXParserFactoryImpl"/>
   -->

  <!-- People who want to hardcode their "Solr Home" directly into the
       WAR File can set the JNDI property here...
   -->
  <!--
    <env-entry>
       <env-entry-name>solr/home</env-entry-name>
       <env-entry-value>/put/your/solr/home/here</env-entry-value>
       <env-entry-type>java.lang.String</env-entry-type>
    </env-entry>
   -->
   
  <!-- Any path (name) registered in solrconfig.xml will be sent to that filter -->
  <filter>
    <filter-name>SolrRequestFilter</filter-name>
    <filter-class>org.apache.solr.servlet.SolrDispatchFilter</filter-class>
    <!-- If you are wiring Solr into a larger web application which controls
         the web context root, you will probably want to mount Solr under
         a path prefix (app.war with /app/solr mounted into it, for example).
         You will need to put this prefix in front of the SolrDispatchFilter
         url-pattern mapping too (/solr/*), and also on any paths for
         legacy Solr servlet mappings you may be using.
         For the admin JSP's to work properly in a path-prefixed configuration,
         the admin folder containing the JSPs needs to be under the app context root
         named to match the path-prefix.  For example:

            .war
               xxx
                 admin
                   stats.jsp
    -->
    <!--
    <init-param>
      <param-name>path-prefix</param-name>
      <param-value>/xxx</param-value>
    </init-param>
    -->
  </filter>

  <filter-mapping>
    <!--
      NOTE: When using multicore, /admin JSP URLs with a core specified
      such as /solr/coreName/admin/stats.jsp get forwarded by a
      RequestDispatcher to /solr/admin/stats.jsp with the specified core
      put into request scope keyed as "org.apache.solr.SolrCore".

      It is unnecessary, and potentially problematic, to have the SolrDispatchFilter
      configured to also filter on forwards.  Do not configure
      this dispatcher as <dispatcher>FORWARD</dispatcher>.
    -->
    <filter-name>SolrRequestFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <!-- Otherwise it will continue to the old servlets -->
  
  <servlet>
    <servlet-name>SolrServer</servlet-name>
    <display-name>Solr</display-name>
    <description>Solr Server</description>
    <servlet-class>org.apache.solr.servlet.SolrServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet>
    <servlet-name>SolrUpdate</servlet-name>
    <display-name>SolrUpdate</display-name>
    <description>Solr Update Handler</description>
    <servlet-class>org.apache.solr.servlet.SolrUpdateServlet</servlet-class>
    <load-on-startup>2</load-on-startup>
  </servlet>

  <servlet>
    <servlet-name>Logging</servlet-name>
    <servlet-class>org.apache.solr.servlet.LogLevelSelection</servlet-class>
  </servlet>

  <!-- @Deprecated -->
  <servlet>
    <servlet-name>ping</servlet-name>
    <jsp-file>/admin/ping.jsp</jsp-file>
  </servlet>

  <servlet-mapping>
    <servlet-name>SolrServer</servlet-name>
    <url-pattern>/select/*</url-pattern>
  </servlet-mapping>

  <servlet-mapping>
    <servlet-name>SolrUpdate</servlet-name>
    <url-pattern>/update/*</url-pattern>
  </servlet-mapping>

  <servlet-mapping>
    <servlet-name>Logging</servlet-name>
    <url-pattern>/admin/logging</url-pattern>
  </servlet-mapping>

  <!-- @Deprecated -->
  <servlet-mapping>
    <servlet-name>ping</servlet-name>
    <url-pattern>/admin/ping</url-pattern>
  </servlet-mapping>

  <!-- @Deprecated -->
  <servlet-mapping>
    <servlet-name>Logging</servlet-name>
    <url-pattern>/admin/logging.jsp</url-pattern>
  </servlet-mapping>
  
  <mime-mapping>
    <extension>.xsl</extension>
    <!-- per http://www.w3.org/TR/2006/PR-xslt20-20061121/ -->
    <mime-type>application/xslt+xml</mime-type>
  </mime-mapping>

  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>index.html</welcome-file>
  </welcome-file-list>

</web-app>

Run the solr using Run As --> Run configurations...
- Specify jetty:run-exploded in Goals field and press Run

Access Solr at http://localhost:8080/<artifactId>/admin/

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