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POjava.lang.LinkageError: loader constraint violation: when resolving interface method javax.servlet.jsp.JspApplicationContext.getExpressionFactory()
 

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  1. POjava.lang.LinkageError: loader constraint violation: when resolving interface method javax.servlet.jsp.JspApplicationContext.getExpressionFactory()
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    <p>I am trying to connect the JSF to database.</p> <p>This are the files</p> <p>web.xml</p> <pre><code> &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"&gt; &lt;display-name&gt;JavaServerFaces&lt;/display-name&gt; &lt;resource-ref&gt; &lt;description&gt;MySQL Datasource example&lt;/description&gt; &lt;res-ref-name&gt;jdbc/mkyongdb&lt;/res-ref-name&gt; &lt;res-type&gt;javax.sql.DataSource&lt;/res-type&gt; &lt;res-auth&gt;Container&lt;/res-auth&gt; &lt;/resource-ref&gt; &lt;!-- Change to "Production" when you are ready to deploy --&gt; &lt;context-param&gt; &lt;param-name&gt;javax.faces.PROJECT_STAGE&lt;/param-name&gt; &lt;param-value&gt;Development&lt;/param-value&gt; &lt;/context-param&gt; &lt;!-- Welcome page --&gt; &lt;welcome-file-list&gt; &lt;welcome-file&gt;default.xhtml&lt;/welcome-file&gt; &lt;/welcome-file-list&gt; &lt;!-- JSF mapping --&gt; &lt;servlet&gt; &lt;servlet-name&gt;Faces Servlet&lt;/servlet-name&gt; &lt;servlet-class&gt;javax.faces.webapp.FacesServlet&lt;/servlet-class&gt; &lt;load-on-startup&gt;1&lt;/load-on-startup&gt; &lt;/servlet&gt; &lt;!-- Map these files with JSF --&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;Faces Servlet&lt;/servlet-name&gt; &lt;url-pattern&gt;/faces/*&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;Faces Servlet&lt;/servlet-name&gt; &lt;url-pattern&gt;*.jsf&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;Faces Servlet&lt;/servlet-name&gt; &lt;url-pattern&gt;*.faces&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;Faces Servlet&lt;/servlet-name&gt; &lt;url-pattern&gt;*.xhtml&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; </code></pre> <p></p> <p>context.xml</p> <pre><code> &lt;Context&gt; &lt;Resource name="jdbc/mkyongdb" auth="Container" type="javax.sql.DataSource" maxActive="100" maxIdle="30" maxWait="10000" username="root" password="root" driverClassName="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost:3306/mkyongdb"/&gt; &lt;/Context&gt; </code></pre> <p>Default.xhtml</p> <pre><code> &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt; &lt;html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core" &gt; &lt;h:head&gt; &lt;h:outputStylesheet library="css" name="table-style.css" /&gt; &lt;/h:head&gt; &lt;h:body&gt; &lt;h1&gt;JSF 2.0 + JDBC Example&lt;/h1&gt; &lt;h:dataTable value="#{customer.getCustomerList()}" var="c" styleClass="order-table" headerClass="order-table-header" rowClasses="order-table-odd-row,order-table-even-row" &gt; &lt;h:column&gt; &lt;f:facet name="header"&gt; Customer ID &lt;/f:facet&gt; #{c.customerID} &lt;/h:column&gt; &lt;h:column&gt; &lt;f:facet name="header"&gt; Name &lt;/f:facet&gt; #{c.name} &lt;/h:column&gt; &lt;h:column&gt; &lt;f:facet name="header"&gt; Address &lt;/f:facet&gt; #{c.address} &lt;/h:column&gt; &lt;h:column&gt; &lt;f:facet name="header"&gt; Created Date &lt;/f:facet&gt; #{c.created_date} &lt;/h:column&gt; &lt;/h:dataTable&gt; &lt;/h:body&gt; &lt;/html&gt; </code></pre> <p>CustomerBean.java</p> <pre><code> package com.mkyong; import java.io.Serializable; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.util.ArrayList; import java.util.List; import javax.annotation.Resource; import javax.faces.bean.ManagedBean; import javax.faces.bean.SessionScoped; import javax.naming.Context; import javax.naming.InitialContext; import javax.naming.NamingException; import javax.sql.DataSource; import com.mkyong.customer.model.Customer; @ManagedBean(name="customer") @SessionScoped public class CustomerBean implements Serializable{ //resource injection @Resource(name="jdbc/mkyongdb") private DataSource ds; //if resource inject is not support, you still can get it manually. /*public CustomerBean(){ try { Context ctx = new InitialContext(); ds = (DataSource)ctx.lookup("java:comp/env/jdbc/mkyongdb"); } catch (NamingException e) { e.printStackTrace(); } }*/ //connect to DB and get customer list public List&lt;Customer&gt; getCustomerList() throws SQLException{ if(ds==null) throw new SQLException("Can't get data source"); //get database connection Connection con = ds.getConnection(); if(con==null) throw new SQLException("Can't get database connection"); PreparedStatement ps = con.prepareStatement( "select customer_id, name, address, created_date from customer"); //get customer data from database ResultSet result = ps.executeQuery(); List&lt;Customer&gt; list = new ArrayList&lt;Customer&gt;(); while(result.next()){ Customer cust = new Customer(); cust.setCustomerID(result.getLong("customer_id")); cust.setName(result.getString("name")); cust.setAddress(result.getString("address")); cust.setCreated_date(result.getDate("created_date")); //store all data into a List list.add(cust); } return list; } } </code></pre> <p>Customer.java</p> <pre><code> package com.mkyong.customer.model; import java.util.Date; public class Customer{ public long customerID; public String name; public String address; public Date created_date; public long getCustomerID() { return customerID; } public void setCustomerID(long customerID) { this.customerID = customerID; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } public Date getCreated_date() { return created_date; } public void setCreated_date(Date created_date) { this.created_date = created_date; } } </code></pre> <p>pom.xml</p> <pre><code> &lt;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/maven-v4_0_0.xsd"&gt; &lt;modelVersion&gt;4.0.0&lt;/modelVersion&gt; &lt;groupId&gt;com.mkyong.common&lt;/groupId&gt; &lt;artifactId&gt;JavaServerFaces&lt;/artifactId&gt; &lt;packaging&gt;war&lt;/packaging&gt; &lt;version&gt;1.0-SNAPSHOT&lt;/version&gt; &lt;name&gt;JavaServerFaces Maven Webapp&lt;/name&gt; &lt;url&gt;http://maven.apache.org&lt;/url&gt; &lt;repositories&gt; &lt;repository&gt; &lt;id&gt;java.net.m2&lt;/id&gt; &lt;name&gt;java.net m2 repo&lt;/name&gt; &lt;url&gt;http://download.java.net/maven/2&lt;/url&gt; &lt;/repository&gt; &lt;/repositories&gt; &lt;dependencies&gt; &lt;!-- MySQL database driver --&gt; &lt;dependency&gt; &lt;groupId&gt;mysql&lt;/groupId&gt; &lt;artifactId&gt;mysql-connector-java&lt;/artifactId&gt; &lt;version&gt;5.1.9&lt;/version&gt; &lt;/dependency&gt; &lt;!-- Spring framework --&gt; &lt;dependency&gt; &lt;groupId&gt;org.springframework&lt;/groupId&gt; &lt;artifactId&gt;spring&lt;/artifactId&gt; &lt;version&gt;2.5.6&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;org.springframework&lt;/groupId&gt; &lt;artifactId&gt;spring-web&lt;/artifactId&gt; &lt;version&gt;2.5.6&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;com.sun.faces&lt;/groupId&gt; &lt;artifactId&gt;jsf-api&lt;/artifactId&gt; &lt;version&gt;2.0.0-b13&lt;/version&gt; &lt;/dependency&gt; &lt;dependency&gt; &lt;groupId&gt;com.sun.faces&lt;/groupId&gt; &lt;artifactId&gt;jsf-impl&lt;/artifactId&gt; &lt;version&gt;2.0.0-b13&lt;/version&gt; &lt;/dependency&gt; &lt;!-- EL 2.2 to support method parameter in EL --&gt; &lt;dependency&gt; &lt;groupId&gt;org.glassfish.web&lt;/groupId&gt; &lt;artifactId&gt;el-impl&lt;/artifactId&gt; &lt;version&gt;2.2&lt;/version&gt; &lt;/dependency&gt; &lt;!-- http://repo1.maven.org/maven2/ --&gt; &lt;dependency&gt; &lt;groupId&gt;javax.servlet&lt;/groupId&gt; &lt;artifactId&gt;jstl&lt;/artifactId&gt; &lt;version&gt;1.2&lt;/version&gt; &lt;/dependency&gt; &lt;/dependencies&gt; &lt;build&gt; &lt;finalName&gt;JavaServerFaces&lt;/finalName&gt; &lt;plugins&gt; &lt;plugin&gt; &lt;groupId&gt;org.apache.maven.plugins&lt;/groupId&gt; &lt;artifactId&gt;maven-compiler-plugin&lt;/artifactId&gt; &lt;version&gt;2.3.1&lt;/version&gt; &lt;configuration&gt; &lt;source&gt;1.6&lt;/source&gt; &lt;target&gt;1.6&lt;/target&gt; &lt;/configuration&gt; &lt;/plugin&gt; &lt;/plugins&gt; &lt;/build&gt; &lt;/project&gt; </code></pre> <p>If I run this in Tomcat7 I am getting the following error</p> <pre><code> SEVERE: Exception sending context initialized event to listener instance of class com.sun.faces.config.ConfigureListener java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" the class loader (instance of org/apache/catalina/loader/WebappClassLoader) of the current class, com/sun/faces/config/ConfigureListener, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type javax/el/ExpressionFactory used in the signature at com.sun.faces.config.ConfigureListener.registerELResolverAndListenerWithJsp(ConfigureListener.java:636) at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:226) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4701) at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5204) at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5199) at java.util.concurrent.FutureTask$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:619) Jun 15, 2012 2:31:32 PM org.apache.catalina.core.StandardContext startInternal SEVERE: Error listenerStart Jun 15, 2012 2:31:32 PM org.apache.catalina.core.StandardContext startInternal SEVERE: Context [/JavaServerFaces] startup failed due to previous errors Jun 15, 2012 2:31:32 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc SEVERE: The web application [/JavaServerFaces] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered. Jun 15, 2012 2:31:32 PM org.apache.coyote.AbstractProtocolHandler start INFO: Starting ProtocolHandler ["http-bio-8080"] Jun 15, 2012 2:31:32 PM org.apache.coyote.AbstractProtocolHandler start INFO: Starting ProtocolHandler ["ajp-bio-8009"] Jun 15, 2012 2:31:32 PM org.apache.catalina.startup.Catalina start INFO: Server startup in 2341 ms </code></pre> <p>Can Anyone help me out to solve this.</p>
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    1. USBalusC
    1. USbharathi
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      1. POjava.lang.LinkageError: loader constraint violation: when resolving interface method javax.servlet.jsp.JspApplicationContext.getExpressionFactory()
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      1. VTDownMod
    1. COThis looks like a clash in class loading the expression-language api (el-api).Any EL jars bundled with your web-application ?
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      1. POjava.lang.LinkageError: loader constraint violation: when resolving interface method javax.servlet.jsp.JspApplicationContext.getExpressionFactory()
      1. USAhamed Mustafa M
    2. COI have solved that error. el-api.jar is found twice.I have a new error.I have updated the question.Please check it.
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      1. POjava.lang.LinkageError: loader constraint violation: when resolving interface method javax.servlet.jsp.JspApplicationContext.getExpressionFactory()
      1. USbharathi
    3. CODo you have jsf-api and jsf-impl jars in WEB-INF/lib ?
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      1. POjava.lang.LinkageError: loader constraint violation: when resolving interface method javax.servlet.jsp.JspApplicationContext.getExpressionFactory()
      1. USAhamed Mustafa M
 

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