Change schema.xml in solr

Can any help me how to change schema.xml in apache Solr server? I deployed my Solr in tomcat server. Then I added a field in schema.xml but on running my java application.

How can I index a csv file or xml file into Solr server using Solrj?

I want to add fields like classname, packagename and url etc. I added fields like.

<field name=packagename" type="text" indexed="true" stored="true"/>
<field name="classname" type="text" indexed="true" stored="true"/>

The content ogf log file is

SEVERE: Exception during parsing file: schema:org.xml.sax.SAXParseException: The end-tag for element type "field" must end with a '>' delimiter.
    at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
    at org.apache.xerces.util.ErrorHandlerWrapper.fatalError(Unknown Source)
    at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
    at org.apa开发者_高级运维che.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
    at org.apache.xerces.impl.XMLScanner.reportFatalError(Unknown Source)
    at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
    at org.apache.solr.core.Config.<init>(Config.java:159)
    at org.apache.solr.schema.IndexSchema.readSchema(IndexSchema.java:420)
    at org.apache.solr.schema.IndexSchema.<init>(IndexSchema.java:125)
    at org.apache.solr.core.CoreContainer.create(CoreContainer.java:461)
    at org.apache.solr.core.CoreContainer.load(CoreContainer.java:316)
    at org.apache.solr.core.CoreContainer.load(CoreContainer.java:207)
    at org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:130)
    at org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:94)
    at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295)
    at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422)
    at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:115)
    at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4071)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4725)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)
    at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:943)
    at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:778)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:504)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1315)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1061)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
    at org.apache.catalina.core.StandardService.start(StandardService.java:525)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
    at java.lang.reflect.Method.invoke(Method.java:599)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

It contains many such things that I can't post here because of the limitation in words.

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Try to run a xml validator on your schema file. Looks like you are missing a closing ">" brace somewhere in the schema that could have been introduced when you added these 2 fields.