OmniFaces ClassNotFoundException CombinedResourceHandler - maven

Question

I'm trying to get BootsFaces, OmniFaces and PrimeFaces running together with Tomcat 9:
pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<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>homepage</groupId>
<artifactId>xxx</artifactId>
<version>1.0-SNAPSHOT</version>
<name>homepage xxx</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<servlet.version>3.1.0</servlet.version>
<jsf.version>2.2.13</jsf.version>
<primefaces.version>6.0</primefaces.version>
<bootfaces.version>1.0.1</bootfaces.version>
<omnifaces.version>2.1</omnifaces.version>
</properties>
<dependencies>
<!-- Servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${servlet.version}</version>
<scope>provided</scope>
</dependency>
<!-- JSF -->
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-api</artifactId>
<version>${jsf.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-impl</artifactId>
<version>${jsf.version}</version>
<scope>compile</scope>
</dependency>
<!-- PrimeFaces -->
<dependency>
<groupId>org.primefaces</groupId>
<artifactId>primefaces</artifactId>
<version>${primefaces.version}</version>
</dependency>
<dependency>
<groupId>org.primefaces.extensions</groupId>
<artifactId>primefaces-extensions</artifactId>
<version>6.0.0</version>
<scope>compile</scope>
</dependency>
<!-- Bootsfaces -->
<dependency>
<groupId>net.bootsfaces</groupId>
<artifactId>bootsfaces</artifactId>
<version>${bootfaces.version}</version>
<scope>compile</scope>
</dependency>
<!-- Omnifaces -->
<dependency>
<groupId>org.omnifaces</groupId>
<artifactId>omnifaces</artifactId>
<version>${omnifaces.version}</version>
<scope>compile</scope>
</dependency>
</dependencies>
web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<welcome-file-list>
<welcome-file>helloworld.xhtml</welcome-file>
</welcome-file-list>
<context-param>
<param-name>primefaces.THEME</param-name>
<param-value>bootstrap</param-value>
</context-param>
<context-param>
<param-name>primefaces.FONT_AWESOME</param-name>
<param-value>true</param-value>
</context-param>
<context-param>
<param-name>BootsFaces_USETHEME</param-name>
<param-value>default</param-value>
</context-param>
faces-config.xml:
<?xml version="1.0" encoding="UTF-8"?>
<faces-config
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd"
version="2.2">
<application>
<resource-handler>org.omnifaces.resourcehandler.CombinedResourceHandler</resource-handler>
</application>
And I get the following Stacktrace when trying to run my project on Tomcat 9:
Cause: Unable to create a new instance of 'org.omnifaces.resourcehandler.CombinedResourceHandler': javax.faces.FacesException: org.omnifaces.resourcehandler.CombinedResourceHandler
at com.sun.faces.config.processor.AbstractConfigProcessor.createInstance(AbstractConfigProcessor.java:378)
at com.sun.faces.config.processor.ApplicationConfigProcessor.setResourceHandler(ApplicationConfigProcessor.java:856)
at com.sun.faces.config.processor.ApplicationConfigProcessor.process(ApplicationConfigProcessor.java:335)
at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:152)
at com.sun.faces.config.processor.LifecycleConfigProcessor.process(LifecycleConfigProcessor.java:137)
at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:152)
at com.sun.faces.config.processor.FactoryConfigProcessor.process(FactoryConfigProcessor.java:239)
at com.sun.faces.config.ConfigManager.initialize(ConfigManager.java:439)
at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:227)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4715)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5179)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:752)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:728)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734)
at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1702)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:482)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:431)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)
at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)
at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)
at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)
at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: javax.faces.FacesException: org.omnifaces.resourcehandler.CombinedResourceHandler
at com.sun.faces.config.processor.AbstractConfigProcessor.loadClass(AbstractConfigProcessor.java:428)
at com.sun.faces.config.processor.AbstractConfigProcessor.createInstance(AbstractConfigProcessor.java:301)
... 53 more
Caused by: java.lang.ClassNotFoundException: org.omnifaces.resourcehandler.CombinedResourceHandler
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1275)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1109)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at com.sun.faces.util.Util.loadClass(Util.java:364)
at com.sun.faces.config.processor.AbstractConfigProcessor.loadClass(AbstractConfigProcessor.java:420)
... 54 more
I've also tried using older versions of OmniFaces, without success.

Answer 1

Your pom.xml is incomplete. If you used exactly the same pom.xml as listed above, you've ended up with a simple jar file instead of a war file, and Maven didn't add any of the libraries to the WEB-INF/lib folder.
To fix that, use these steps:
specify the <packaging>.
add the Maven war plugin
and - if you're using Eclipse - specify the Java version you want to use. Otherwise Eclipse assumes you're using Java 1.5, which won't work with BootsFaces.
By the way, you don't need the CombinedResourceHandler. It's just a great tool to speed up your application until http/2 arrives.
For the sake of convenience, here's the complete working pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<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>homepage</groupId>
<artifactId>xxx</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>homepage xxx</name>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<servlet.version>3.1.0</servlet.version>
<jsf.version>2.2.13</jsf.version>
<primefaces.version>6.0</primefaces.version>
<bootfaces.version>1.0.1</bootfaces.version>
<omnifaces.version>1.12.1</omnifaces.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
<maven.compiler.testSource>1.7</maven.compiler.testSource>
<maven.compiler.testTarget>1.7</maven.compiler.testTarget>
</properties>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${servlet.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-api</artifactId>
<version>${jsf.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.sun.faces</groupId>
<artifactId>jsf-impl</artifactId>
<version>${jsf.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.primefaces</groupId>
<artifactId>primefaces</artifactId>
<version>${primefaces.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.primefaces.extensions</groupId>
<artifactId>primefaces-extensions</artifactId>
<version>6.0.0</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>net.bootsfaces</groupId>
<artifactId>bootsfaces</artifactId>
<version>${bootfaces.version}</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.omnifaces</groupId>
<artifactId>omnifaces</artifactId>
<version>${omnifaces.version}</version>
<scope>compile</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.5</version>
</plugin>
</plugins>
</build>
</project>