java.lang.LinkageError loader constraint violation ELResover

java.lang.LinkageError due to constraint violation loader will prevent the server startup and will throw Exception sending context destroyed event to listener instance of class org.apache.myfaces.webapp.StartupServletContextListener and says "SEVERE: Error listenerStart"

In detail you might see following error in your console:

Oct 8, 2013 11:24:36 AM org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
Oct 8, 2013 11:24:36 AM org.apache.catalina.core.StandardContext start
SEVERE: Context [/ACTS] startup failed due to previous errors
Oct 8, 2013 11:24:36 AM org.apache.catalina.core.ApplicationContext log
INFO: Closing Spring root WebApplicationContext
Oct 8, 2013 11:24:36 AM org.apache.catalina.core.ApplicationContext log
INFO: Shutting down log4j
Oct 8, 2013 11:24:36 AM org.apache.catalina.core.StandardContext listenerStop
SEVERE: Exception sending context destroyed event to listener instance of class org.apache.myfaces.webapp.StartupServletContextListener
java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/catalina/loader/WebappClassLoader) previously initiated loading for a different type with name "javax/el/ExpressionFactory"
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1847)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:890)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1354)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
at java.lang.Class.getDeclaredMethods(Class.java:1791)
at org.apache.myfaces.config.annotation.NoInjectionAnnotationLifecycleProvider.destroyInstance(NoInjectionAnnotationLifecycleProvider.java:94)
at org.apache.myfaces.webapp.AbstractMyFacesListener.doPreDestroy(AbstractMyFacesListener.java:61)
at org.apache.myfaces.webapp.StartupServletContextListener.doPredestroy(StartupServletContextListener.java:213)
at org.apache.myfaces.webapp.StartupServletContextListener.contextDestroyed(StartupServletContextListener.java:190)
at org.apache.catalina.core.StandardContext.listenerStop(StandardContext.java:3882)
at org.apache.catalina.core.StandardContext.stop(StandardContext.java:4523)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4387)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
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:578)
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:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Oct 8, 2013 11:24:37 AM org.apache.coyote.http11.Http11Protocol start

This error is mainly due to the ELResolver has multiple interfaces and hence the conflict.

If your using eclipse, try to search for ELResolver class by using Open Type (Ctrl + Shift + t) and check those are declared in your POM file with scope "provided"
Mostly if you see any jar file having ELResolver which is not used in any POM file, remove them or try hard refresh your project

Hope that solves the problem.

If you find any other ways to solve the problem, please post in the comments, so atleast that helps others.

How to get rid of Perm gen space outOfMemory exception in eclipse

Add “-Xms512m -Xmx1024m -XX:MaxPermSize=256m” at the end of VM arguments in run configuration to get rid of perm gen space outOfMemory exception.

When clicking on a community page, liferay opens a download window instead of displaying portlet

Why liferay opens a download window instead of displaying portlet when you click on a particular page?

This problem occurs only when the page doesnt have any portlet or webcontent to display or the previous one is deleted/undeployed

try to add a portlet and access page, it works.

Debugging the dreaded "SEVERE: Error listenerStart" and "SEVERE: Error filterStart" tomcat error messages

Just a quick post that I hope might benefit others. If you have been developing web applications on tomcat for a while you have likely come the two error messages mentioned in the title.

SEVERE: Error listenerStart

Occurs when an exception is thrown in the contextInitialized method of a ServletContextListener

SEVERE: Error filterStart

Occurs when an exception is thrown in the init method of a Filter

Unfortunately by default, tomcat won't provide you with any details about the cause of the error. Infact it wont even tell you which filter or listener is failing. This can be big problem in applications of significant size that have many filters and listeners configured. Fortunately there is a solution. In your webapplication's WEB-INF/classes folder you can create a logging.properties file with the following contents

org.apache.catalina.core.ContainerBase.[Catalina].level = INFO
org.apache.catalina.core.ContainerBase.[Catalina].handlers = java.util.logging.ConsoleHandler

Now you will be presented with the stacktrace

How to remote debug Tomcat (JPDA) when server has multiple virtual hosts running

Running Tomcat with remote debugging enabled

• deploy the application you need to debug as usually
• start Tomcat by executing the catalina.bat script and providing the "jpda" argument 

(ex.: D:\Develtools\apache-tomcat-7.0.26\bin>catalina jpda start)

Then, all you need to do is to create a remote Java application in Eclipse through these few steps : 

1° Open the debug configurations 

2° Create a new Remote Java application : 

3° Specify the project you're debugging (in my example, I've configured remote debugging for one on my sample projects, named "Blog - Remote Tomcat debugging")

4° Specify the host on which the application to debug is deployed

5° Specify the port that is opened for debugging purpose (same as the one configured as JPDA_ADDRESS in the catalina.bat file from Tomcat)

6° Launch the Remote application by clicking on "Debug" 

At this point, you could set breakpoints wherever you want in the project's source code and if the code marked with your breakpoints is executed, the running thread will be suspended and you'll be able to watch variables' value, execute expression, and so on.

Content Assist for xhtml pages

If you are reading this means your experiencing problem with content assist for xhtml pages.
First thing to have the content assist for xhtml or jspx pages in the Eclipse IDE, you need Jboss tools for html or Jboss tools for Jsp editor pluging. To install that plugin add the following site address in the Eclipse IDE

This plugin helps to get the content assist by default fot .jspx files but not .xhtml file.

To enable content assist for other files open web project properties and then look for "Jboss tools knowledge base" and check the "Jboss tools knowledge base support"

thats it enjoy the day.

Exception sending context initialized event to listener instan,Class path resource [applicationContext.xml] cannot be opened because it does not exist

SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Failed to import bean definitions from URL location [classpath:applicationContext.xml]
Offending resource: ServletContext resource [/WEB-INF/web-application-config.xml]; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from class path resource [applicationContext.xml]; nested exception is java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist
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.parsing.ReaderContext.error(ReaderContext.java:76)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.importBeanDefinitionResource(DefaultBeanDefinitionDocumentReader.java:193)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseDefaultElement(DefaultBeanDefinitionDocumentReader.java:148)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:133)
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 org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:124)
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:458)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:388)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:261)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:192)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4205)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4704)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
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:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from class path resource [applicationContext.xml]; nested exception is java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:341)
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.xml.DefaultBeanDefinitionDocumentReader.importBeanDefinitionResource(DefaultBeanDefinitionDocumentReader.java:187)
... 33 more
Caused by: java.io.FileNotFoundException: class path resource [applicationContext.xml] cannot be opened because it does not exist
at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:141)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:328)
... 37 more
Aug 4, 2011 9:49:56 AM com.sun.faces.config.ConfigureListener contextInitialized

The above error is mainly because you didnt imported the dependent projects into your web application project or the required jar is not added to your WEB-INF/lib directory

In Eclipse IDE, to add the dependent projects as jar files to WEB-INF/lib goto the prject properties-deployment assembly and click on add which navigates you to a screen where you are allowed to add any archive file to your project.