CDI interceptor does not recognize Priority variable

So folks were following this tutorial: DataSource in Tomcat only when implementing the part of CDI of the project I ran with the following error:

com/mycompany/soft/util/TransactionInterceptor.java:[13,22] cannot find symbol
  symbol:   variable Priority
  location: @interface javax.interceptor.Interceptor
1 error

I just followed the example with the code examples in GitHub and I have no idea where the error is.

The class that generates the error follows:

package com.mycompany.soft.util;

import java.io.Serializable;

import javax.annotation.Priority;
import javax.inject.Inject;
import javax.interceptor.AroundInvoke;
import javax.interceptor.Interceptor;
import javax.interceptor.InvocationContext;
import javax.persistence.EntityManager;
import javax.persistence.EntityTransaction;

@Transactional
@Interceptor
@Priority(Interceptor.Priority.LIBRARY_BEFORE)
public class TransactionInterceptor implements Serializable {

    private static final long serialVersionUID = 1L;

    private @Inject
    EntityManager manager;

    @AroundInvoke
    public Object invoke(InvocationContext context) throws Exception {
        EntityTransaction trx = manager.getTransaction();
        boolean criador = false;

        try {
            if (!trx.isActive()) {
                // truque para fazer rollback no que já passou
                // (senão, um futuro commit, confirmaria até mesmo operações sem transação)
                trx.begin();
                trx.rollback();

                // agora sim inicia a transação
                trx.begin();

                criador = true;
            }

            return context.proceed();
        } catch (Exception e) {
            if (trx != null && criador) {
                trx.rollback();
            }

            throw e;
        } finally {
            if (trx != null && trx.isActive() && criador) {
                trx.commit();
            }
        }
    }
}

And now my Pom, it's a bit different from his, but even with the same dependencies as his, the error continued ...

<?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>com.mycompany.soft</groupId>
    <artifactId>Soft</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>

        <!-- Dependências da camada de apresentação - INÍCIO -->
        <dependency>
            <groupId>org.primefaces</groupId>
            <artifactId>primefaces</artifactId>
            <version>6.0</version>
            <scope>compile</scope>
        </dependency>

        <dependency>
            <groupId>org.glassfish</groupId>
            <artifactId>javax.faces</artifactId>
            <version>2.2.14</version>
            <scope>compile</scope>
        </dependency>
        <!-- Dependências da camada de apresentação - FIM -->

        <!-- Driver do MySQL -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.41</version>
        </dependency>

        <!-- Driver do Jasper -->
        <dependency>
            <groupId>net.sf.jasperreports</groupId>
            <artifactId>jasperreports</artifactId>
            <version>6.1.1</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.2.3.Final</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.17</version>
        </dependency>

        <!-- Dependências para auxiliar no upload - INÍCIO -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.5</version>
        </dependency>

        <dependency>
            <groupId>org.jboss.weld.servlet</groupId>
            <artifactId>weld-servlet</artifactId>
            <version>2.4.7.Final</version>
        </dependency>

    </dependencies>

    <build>
        <finalName>${project.artifactId}</finalName>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

Here is the link for his project that I relied on: Link