"Could not initialize class..." error in pom.xml with a new Maven project

Question

I wanted to learn how to develop RESTful APIs with JAX-RS and so started with an example covered in one of the YouTube videos. The video was created 5 -6 years ago and used Tomcat 7 and an older version of Eclipse. But I installed the recent versions of Tomcat (10.0.6) and Eclipse (jee-2021-03) and followed the tutorial.

I created a new maven project with the following archetype: Group Id: org.glassfish.jersey.archetypes Artifact Id: jersey-quickstart-webapp Version: 3.0.2

I provided Group Id and Artifact Id for my project with default version 0.0.1-SNAPSHOT and clicked Finish.

Eclipse created the project with the following 2 errors:

1. index.jsp: "The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path"
2. pom.xml: "Could not initialize class org.apache.maven.plugin.war.util.WebappStructureSerializer" on the very first line.

I'd appreciate if someone can help me understand why I'm getting these errors and how to resolve them.

Here is my pom.xml.

<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">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.xyz.rest</groupId>
    <artifactId>onlineshopping</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>onlineshopping</name>

    <build>
        <finalName>onlineshopping</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <inherited>true</inherited>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.glassfish.jersey</groupId>
                <artifactId>jersey-bom</artifactId>
                <version>${jersey.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet-core</artifactId>
            <!-- use the following artifactId if you don't need servlet 2.x compatibility -->
            <!-- artifactId>jersey-container-servlet</artifactId -->
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.inject</groupId>
            <artifactId>jersey-hk2</artifactId>
        </dependency>
        <!-- uncomment this to get JSON support
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-json-binding</artifactId>
        </dependency>
        -->
    </dependencies>
    <properties>
        <jersey.version>3.0.2</jersey.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
</project>

Answer 1

1. Could not initialize class org.apache.maven.plugin.war.util.WebappStructureSerializer

   This message is not an error it is a bug of eclipse new version so you need to take older version or need to wait for fixing this bug.

2. For fixing this you can use below code in pom.XML file try this it will fix error message -:

   <plugins>
      <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-war-plugin</artifactId>
          <version>3.3.1</version>
      </plugin>
   </plugins>
   

Answer 2

for first problem:

1. right click on your project
2. click Properties
3. click Targeted Runtimes
4. tick mark Apache Tomcat v10.0
5. click Apply and Close

for second problem: add the following plugin inside the pom.xml file inside build -> plugins

<plugin>
    <artifactId>maven-war-plugin</artifactId>
    <version>3.2.2</version>
</plugin>

your pom.xml file should be like this:

<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">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.xyz.rest</groupId>
    <artifactId>onlineshopping</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>onlineshopping</name>

    <build>
        <finalName>onlineshopping</finalName>
        <plugins>
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.2.2</version>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <inherited>true</inherited>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.glassfish.jersey</groupId>
                <artifactId>jersey-bom</artifactId>
                <version>${jersey.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet-core</artifactId>
            <!-- use the following artifactId if you don't need servlet 2.x compatibility -->
            <!-- artifactId>jersey-container-servlet</artifactId -->
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.inject</groupId>
            <artifactId>jersey-hk2</artifactId>
        </dependency>
        <!-- uncomment this to get JSON support
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-json-binding</artifactId>
        </dependency>
        -->
    </dependencies>
    <properties>
        <jersey.version>3.0.2</jersey.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
</project>

Hope this will solve your problems.

Answer 3

For 1/ index.jsp add the following dependency in pom.xml

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>javax.servlet-api</artifactId>
    <version>3.1.0</version>
    <scope>provided</scope>
</dependency>

for 2/ pom.xml add the following property at the end of eclipse.ini and restart eclipse

--illegal-access=permit