Problem to use PrimeFaces - no taglibrary exists for that namespace.

[Cezar Apulchro]

Hi, I downloaded Primefaces 8.0 and trying to use I have defined an class with datatable but I am receiving an error "Warning: This page calls for XML namespace http://primefaces.org/ui declared with prefix p but no taglibrary exists for that namespace".
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>itc.itcsystems</groupId>
    <artifactId>ITC_Systems_ClientesMedicos</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>ITC_Systems_ClientesMedicos</name>
    
    <dependencies>
        <dependency>
            <groupId>com.sun.faces</groupId>
            <artifactId>jsf-api</artifactId>
            <version>2.2.20</version>
        </dependency>
        
        <dependency>
            <groupId>com.sun.faces</groupId>
            <artifactId>jsf-impl</artifactId>
            <version>2.2.20</version>
        </dependency>
  
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
  
        <dependency>
            <groupId>javax.servlet.jsp.jstl</groupId>
            <artifactId>javax.servlet.jsp.jstl-api</artifactId>
            <version>1.2.2</version>
        </dependency>
        
        <dependency>
            <groupId>org.primefaces</groupId>
            <artifactId>primefaces</artifactId>
            <version>8.0</version>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>7.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>   
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                    <compilerArguments>
                        <endorseddirs>${endorsed.dir}</endorseddirs>
                    </compilerArguments>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.3</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>2.6</version>
                <executions>
                    <execution>
                        <phase>validate</phase>
                        <goals>
                            <goal>copy</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${endorsed.dir}</outputDirectory>
                            <silent>true</silent>
                            <artifactItems>
                                <artifactItem>
                                    <groupId>javax</groupId>
                                    <artifactId>javaee-endorsed-api</artifactId>
                                    <version>7.0</version>
                                    <type>jar</type>
                                </artifactItem>
                            </artifactItems>
                            <resources>
                                <resource>
                                    <directory>src/main/resources</directory>
                                    <filtering>true</filtering>
                                </resource>
                            </resources>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" 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">
    <context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <param-value>Development</param-value>
    </context-param>

    <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet>
        <servlet-name>Resource Servlet</servlet-name>
        <servlet-class>org.primefaces.resource.ResourceServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>/faces/*</url-pattern>
    </servlet-mapping>
    <!-- Faces Servlet -->
    <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.jsf</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Resource Servlet</servlet-name>
        <url-pattern>/org.richfaces.resources/*</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>Resource Servlet</servlet-name>
        <url-pattern>/primefaces_resource/*</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>
            30
        </session-timeout>
    </session-config>
    <welcome-file-list>
        <welcome-file>faces/index.xhtml</welcome-file>
    </welcome-file-list>
</web-app>

My class:

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition
    xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:p="http://primefaces.org/ui">
    
    <h:head>
        <link href="styles.css" type="text/css" rel="stylesheet"></link>
        <script type="text/javaScript" src="carregacid.js"></script>
        <h:outputStylesheet library="css" name="csstxtdtble.css"></h:outputStylesheet>
        <h:outputScript library="js" name="carregacid.js"></h:outputScript> 
    </h:head>
    <h:body style="background: #FFDAB9;"></h:body>    
    <div id="divtab1">
        <p:dataTable value="#{testebean.especialidade}" var="esp">
        <p:column>
            <h:outputText value="#{esp.especialidade}"></h:outputText>
        </p:column>
    </p:dataTable>
</ui:composition>

Thanks.

[Ron McLeod]

Cezar Apulchro wrote:I have defined an class with datatable but I am receiving an error ...

Where/when do you see the error?

Also, your xhtml document is missing a closing tag for the <div> element.

[Cezar Apulchro]

Hi, I send only a piece of my class, in the copy </div> was left out but the div is closed ok, the error occur when I execute localhost.

http://localhost:8080/ITC_Systems_ClientesMedicos/teste.jsf

[Tim Holloway]

Your XML PI on your "class" is invalid again. You're using single quotes where you should be using double quotes:

<?xml version="1.0" encoding="UTF-8"?>

It's not a class, though. it's a View Template.

That URL is awful. It has embedded spaces in it. Yes, it's legal, but there are all sorts of ways for careless people and software to make mistakes.

[Cezar Apulchro]

Change made but the problem is still the same.

<?xml version="1.0" encoding="UTF-8" ?>

[Tim Holloway]

Your POM specified JDK 7. Are you sure you want something that old?

Also, does your Maven project create a /target/ITC_Systems_ClientesMedicos/WEB-INF/lib/primefaces.jar file?

[Cezar Apulchro]

I downloaded jdk 16 and nothing is shown, no errors and no datatable results. I changed the path of JAVA_HOME to jdk 16 there is another place to be changed.

[Cezar Apulchro]

if i understand you, no, maven don't created a /target/ITC_Systems_ClientesMedicos/WEB-INF/lib/primefaces.jar file

[Tim Holloway]

               <configuration>                    <source>1.7</source>                    <target>1.7</target>                    <compilerArguments>                        <endorseddirs>${endorsed.dir}</endorseddirs>                    </compilerArguments>                </configuration>
This says to compile based on Java 7 source code specifications and to produce classes designed to run under Java 7. What JDK version you use does not matter, since the JDK compiler will apply the rules that Maven tells it do.

And if you don't have a /target/ITC_Systems_ClientesMedicos/WEB-INF/lib/primefaces-8.0.jar file in your Maven project when you do a maven build then Maven is not building the project properly and you need to look closely at your POM.

[Cezar Apulchro]

I made two test, first I deleted plugin of endorsed dir,  second deleted endorsed dir and change source for 1.8 in plugin but problem still the same without error and datatable contents.

[Tim Holloway]

The endorsed directories are just a distraction. We already covered them last time you had a problem.

And what do you mean, "without error"? This thread started when you reported a message trying to display a web page.

[Cezar Apulchro]

I'm saying that I don't receiving error msg I receive only blank page.

[Tim Holloway]

Cezar Apulchro wrote:I'm saying that I don't receiving error msg I receive only blank page.

Well, I can certainly believe that:
   <h:body style="background: #FFDAB9;"></h:body>  

[Cezar Apulchro]

Hi, sorry by delay. I solve the problem but solution was install Eclipse and create new project with primefaces.
Thanks and best regards.