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How to create WAR for Spark 1.1.1 application?

I've created nice application using Spark. Now I want to deploy it to Apache Tomcat 7. I've tried to build WAR using Apache Ant:
<target name="war">
<war destfile="ROOT.war"
webxml="web.xml">
<classes dir="classes"/>
</war>
</target>
I've placed compiled code into classes folder. In web.xml I've placed officially recommended code:
<web-app>
<filter>
<filter-name>SparkFilter</filter-name>
<filter-class>spark.servlet.SparkFilter</filter-class>
<init-param>
<param-name>applicationClass</param-name>
<param-value>com.MyApplication</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>SparkFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
Then I've placed ROOT.war into webapps folder, restarted Tomcat and my application isn't deployed.
I've checked catalina.out
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:904)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1073)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1857)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Looks not very informative. Then I've checked localhost logs.
Feb 28, 2016 4:02:24 AM org.apache.catalina.core.StandardContext filterStart
SEVERE: Exception starting filter SparkFilter
java.lang.ClassNotFoundException: spark.servlet.SparkFilter
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1718)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1569)
at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:529)
at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:511)
at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:139)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:258)
at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:105)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4809)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5485)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:632)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1073)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1857)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Hm, looks like there is no some Spark JAR in classpath. I've added
/usr/share/tomcat7/lib/spark-core-1.1.1.jar
It looks like there is no spark.servlet.SparkFilter there. Do you have any ideas where I can find this jar?
Or if anyone has WAR file ready to deploy, could you share it with me?
I have checked that jar files from /usr/share/tomcat7/lib/ are used by other servlets.

I have added an example of how you build a war with maven and sparkjava 2.3.
Here is the repository https://github.com/kliakos/sparkjava-war-example with instructions.
The steps are fairly simple. It should work with a fresh Tomcat installation, otherwise it may be some Tomcat related problem you are facing.

JRuby warbler "compiled" command produces ClassCastException in Tomcat

I'm using warbler to package my JRuby web app into a war file and am deploying it to Apache Tomcat 8.0.21. This works well. However, I'm trying to run warbler using the "compiled" command instead:
warble compiled war
When I deploy the resulting war file, I'm getting the following exception :
org.jruby.rack.RackInitializationException: load error: /apache-tomcat-8.0.21/webapps/ROOT/WEB-INF/config/boot -- java.lang.ClassCastException: java.lang.Object cannot be cast to java.lang.invoke.SwitchPoint
from org/jruby/RubyKernel.java:1054:in `require'
from jar:file:/apache-tomcat-8.0.21/webapps/ROOT/WEB-INF/lib/jruby-stdlib-1.7.4.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/custom_require.rb:36:in `require'
from file:/apache-tomcat-8.0.21/webapps/ROOT/WEB-INF/lib/jruby-rack-1.1.13.3.jar!/jruby/rack/rails/environment3.rb:23:in `load_environment'
from file:/apache-tomcat-8.0.21/webapps/ROOT/WEB-INF/lib/jruby-rack-1.1.13.3.jar!/jruby/rack/rails_booter.rb:79:in `load_environment'
from <script>:1:in `(root)'
at org.jruby.rack.RackInitializationException.wrap(RackInitializationException.java:29)
at org.jruby.rack.RackApplicationFactoryDecorator.init(RackApplicationFactoryDecorator.java:98)
at org.jruby.rack.RackServletContextListener.contextInitialized(RackServletContextListener.java:50)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4728)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5166)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:940)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1738)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
Caused by: org.jruby.exceptions.RaiseException: (LoadError) load error: /apache-tomcat-8.0.21/webapps/ROOT/WEB-INF/config/boot -- java.lang.ClassCastException: java.lang.Object cannot be cast to java.lang.invoke.SwitchPoint
at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:1054)
at RUBY.require(jar:file:/apache-tomcat-8.0.21/webapps/ROOT/WEB-INF/lib/jruby-stdlib-1.7.4.jar!/META-INF/jruby.home/lib/ruby/shared/rubygems/custom_require.rb:36)
at RUBY.load_environment(file:/apache-tomcat-8.0.21/webapps/ROOT/WEB-INF/lib/jruby-rack-1.1.13.3.jar!/jruby/rack/rails/environment3.rb:23)
at RUBY.load_environment(file:/apache-tomcat-8.0.21/webapps/ROOT/WEB-INF/lib/jruby-rack-1.1.13.3.jar!/jruby/rack/rails_booter.rb:79)
at RUBY.(root)(<script>:1)
How come the compiled version is producing an exception? Any help is appreciated. Thanks!

I think this was a bug related to the warbler gem. I just upgraded my JRuby version from 1.7.4 to 1.7.5 and also upgraded warbler from 1.4.3 to 1.4.8 and that fixed this issue.

Jboss AS7 Resteasy sample Oauth2 skeleton key deploy NoClassDefFoundError from PoolingClientConnectionManager

Running the default Skeleton Key example with Jboss AS7 and Resteasy, I have followed the directions exactly here: https://github.com/resteasy/Resteasy/tree/master/jaxrs/examples/oauth2-as7-example but still get an error on deploy:
14:35:10,453 ERROR [org.apache.catalina.core.StandardContext] (MSC
service thread 1-11) Context [/customer-portal] startup failed due to
previous errors: java.lang.NoClassDefFoundError:
org/apache/http/impl/conn/PoolingClientConnectionManager at
org.jboss.resteasy.client.jaxrs.ResteasyClientBuilder.initDefaultEngine(ResteasyClientBuilder.java:428)
[resteasy-client-3.0.6.Final.jar:] at
org.jboss.resteasy.client.jaxrs.ResteasyClientBuilder.build(ResteasyClientBuilder.java:333)
[resteasy-client-3.0.6.Final.jar:] at
org.jboss.resteasy.skeleton.key.as7.OAuthManagedResourceValve.init(OAuthManagedResourceValve.java:115)
[skeleton-key-as7-3.0.6.Final.jar:] at
org.jboss.resteasy.skeleton.key.as7.OAuthManagedResourceValve.lifecycleEvent(OAuthManagedResourceValve.java:66)
[skeleton-key-as7-3.0.6.Final.jar:] at
org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:115)
[jbossweb-7.0.13.Final.jar:] at
org.apache.catalina.core.StandardContext.start(StandardContext.java:3845)
[jbossweb-7.0.13.Final.jar:] at
org.jboss.as.web.deployment.WebDeploymentService.start(WebDeploymentService.java:90)
[jboss-as-web-7.1.1.Final.jar:7.1.1.Final] at
org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1811)
at
org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1746)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
[rt.jar:1.7.0_25] at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
[rt.jar:1.7.0_25] at java.lang.Thread.run(Thread.java:724)
[rt.jar:1.7.0_25] Caused by: java.lang.ClassNotFoundException:
org.apache.http.impl.conn.PoolingClientConnectionManager from [Module
"org.jboss.resteasy.resteasy-jaxrs:main" from local module loader
#1d1aed21 (roots: /Users/JamesTruty/work/jboss-as-7.1.1.Final
oauth/modules)] at
org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:190)
at
org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:468)
at
org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:456)
at
org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:398)
at
org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:120)
... 12 more
I have tried various ways of trying to include the apache httpclient library, but still no luck. Am I missing something?

A NoClassDefFoundError specifies that the particular library was available during compile time, but missing at runtime. You need to make sure that httpclient jar is present in your classpath. If it is present then it might be having a static initialization failure or is being loaded via a different classloader. You can go through this for any further info on how to debug a NoClassDefFoundError

Okay, after more tweaking I got it to successfully deploy the sample app. I needed to update the jar versions and modify the module xml in Jboss to point to org.apache.httpcomponents to use httpclient-4.2.1.jar, httpcore-4.2.1.jar and httpmime-4.2.1.jar.

How to backport a 6.1.1 jsf portlet to get it running on a 6.1.0 liferay portal?

I'm trying to get an 6.1.1 Portlet running on a 6.1.0 Liferay CE Portal. The JSF Portlet uses the ServiceBuilder and a lot of other Util API classes of Liferay.
I thought the best idea would be to recompile the portlet with the correct liferay-plugins-sdk.
After downloading the 6.1.0 SDK, replacing it in the eclipse project, and rebuild it, I get
a couple of exceptions. They occur immediately after starting the server.
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Bean class [com.liferay.portal.kernel.spring.util.SpringFactoryUtil] not found
Offending resource: ServletContext resource [/WEB-INF/classes/META-INF/cluster-spring.xml]
Bean ''; nested exception is java.lang.ClassNotFoundException: com.liferay.portal.kernel.spring.util.SpringFactoryUtil
at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:68)
at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.error(BeanDefinitionParserDelegate.java:291)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseBeanDefinitionElement(BeanDefinitionParserDelegate.java:491)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseBeanDefinitionElement(BeanDefinitionParserDelegate.java:396)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseBeanDefinitionElement(BeanDefinitionParserDelegate.java:365)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.processBeanDefinition(DefaultBeanDefinitionDocumentReader.java:258)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseDefaultElement(DefaultBeanDefinitionDocumentReader.java:153)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:132)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:93)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:493)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:390)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149)
at com.liferay.portal.spring.context.PortletApplicationContext.loadBeanDefinitions(PortletApplicationContext.java:76)
at org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:93)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:130)
at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:467)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:397)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:282)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:204)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
at com.liferay.portal.spring.context.PortletContextLoaderListener.contextInitialized(PortletContextLoaderListener.java:99)
at com.liferay.portal.kernel.servlet.PortalClassLoaderServletContextListener.doPortalInit(PortalClassLoaderServletContextListener.java:91)
at com.liferay.portal.kernel.util.BasePortalLifecycle.portalInit(BasePortalLifecycle.java:42)
at com.liferay.portal.kernel.util.PortalLifecycleUtil.register(PortalLifecycleUtil.java:61)
at com.liferay.portal.kernel.util.PortalLifecycleUtil.register(PortalLifecycleUtil.java:53)
at com.liferay.portal.kernel.util.BasePortalLifecycle.registerPortalLifecycle(BasePortalLifecycle.java:52)
at com.liferay.portal.kernel.servlet.PortalClassLoaderServletContextListener.contextInitialized(PortalClassLoaderServletContextListener.java:50)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4765)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5260)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.startup.HostConfig.checkResources(HostConfig.java:1362)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1450)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:295)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1338)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1496)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1506)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1485)
at java.lang.Thread.run(Thread.java:680)
Caused by: java.lang.ClassNotFoundException: com.liferay.portal.kernel.spring.util.SpringFactoryUtil
at java.lang.ClassLoader.findClass(ClassLoader.java:358)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at com.liferay.portal.spring.util.FilterClassLoader.loadClass(FilterClassLoader.java:41)
at org.springframework.util.ClassUtils.forName(ClassUtils.java:257)
at org.springframework.beans.factory.support.BeanDefinitionReaderUtils.createBeanDefinition(BeanDefinitionReaderUtils.java:63)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.createBeanDefinition(BeanDefinitionParserDelegate.java:616)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseBeanDefinitionElement(BeanDefinitionParserDelegate.java:472)
... 41 more
Has someone a good idea? I also posted this issue on the official forum , but maybe here I reach more people...
Here is the link to the forum: http://www.liferay.com/community/forums/-/message_boards/message/19124222
==== Update 1====
To solve the above exception I ran the service-builder within the 6.1.0 portlet again.
Now it is possible to start the server with the portlet, buuut
the portlet is not visible/available in the portal for adding in a page and I get the
following ClassNotFoundException: PortletBeanLocatorUtil:
12:24:06,627 ERROR [PortletContextLoaderListener:132] java.lang.ClassNotFoundException: com.liferay.util.bean.PortletBeanLocatorUtil
java.lang.ClassNotFoundException: com.liferay.util.bean.PortletBeanLocatorUtil
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1688)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1533)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at com.liferay.portal.spring.context.PortletContextLoaderListener.contextInitialized(PortletContextLoaderListener.java:118)
at com.liferay.portal.kernel.servlet.PortalClassLoaderServletContextListener.doPortalInit(PortalClassLoaderServletContextListener.java:91)
at com.liferay.portal.kernel.util.BasePortalLifecycle.portalInit(BasePortalLifecycle.java:42)
at com.liferay.portal.kernel.util.PortalLifecycleUtil.flushInits(PortalLifecycleUtil.java:45)
at com.liferay.portal.servlet.MainServlet.initPlugins(MainServlet.java:813)
at com.liferay.portal.servlet.MainServlet.init(MainServlet.java:347)
at javax.servlet.GenericServlet.init(GenericServlet.java:160)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1266)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1185)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1080)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5001)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5289)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:866)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:842)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:615)
at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:649)
at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1581)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)
Thanks for any suggestions!

It's probably easier to recompile the portlet in the 6.1.0 sdk. Especially when you use ServiceBuilder: you're running with a code generator that is probably relying on the runtime files that come matching runtime to generated code.
For pure JSR-286 portlets, they are easily compatible even across major versions. If you use more sophisticated code, e.g. ServiceBuilder or the API, lots of effort is taken to keep it compatible, but no guarantee can be given that it actually is binary compatible - sorry, that's life.
For Liferay's own plugins, you're asked to use matching versions - they're not tested between updates. And they most likely use ServiceBuilder and the API as well.

Exception when running Tomcat server org.apache.catalina.deploy.WebXml addServlet

I've written a couple of servlets on my local machine using eclipse. I've tested them on my local machine and everything works perfectly fine.
I then exported my project as a .war file and put it under the webapps directory of my tomcat in another machine to which I only have ssh access to. I restarted my tomcat server and after looking at the log files I see that it's throwing the following exception:
java.lang.NoSuchMethodException: org.apache.catalina.deploy.WebXml addServlet
at org.apache.tomcat.util.IntrospectionUtils.callMethod1(IntrospectionUtils.java:855)
at org.apache.tomcat.util.digester.SetNextRule.end(SetNextRule.java:201)
at org.apache.tomcat.util.digester.Digester.endElement(Digester.java:1051)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:604)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1759)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2915)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:625)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:488)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:819)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:748)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1208)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:525)
at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1537)
at org.apache.catalina.startup.ContextConfig.parseWebXml(ContextConfig.java:1875)
at org.apache.catalina.startup.ContextConfig.getDefaultWebXmlFragment(ContextConfig.java:1472)
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1250)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:369)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5173)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:968)
at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1646)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:679)
No idea what this means?

I found the solution here.
I was right as in you don't need to have the web.xml anymore. You can simply use annotations to define paths for your servlet. But the problem was that I was including catalina.jar in my lib which was causing issues. Removing catalina.jar fixed things up!

I met this problem after I use maven into my project. As Adam said, I removed all tomcat libs in the maven dependencies and then the problem fixed.