POM packaging option jar to war change error

Question

Hi I'm trying to change the packaging option from jar to war in my pom.xml. But when everi changes this leads to an error. So that i am not able to create the war file for my spring boot application.

My 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>com.domain</groupId>
    <artifactId>AsBuilt-MS</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>AsBuilt-MS</name>
    <description>Demo project for AsBuilt-MS Application</description>
    <packaging>jar</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.1.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <start-class>com.domain.AsBuiltMS.AsBuiltMsApplication</start-class>
    </properties>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.springframework/spring-binding -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-binding</artifactId>
            <version>1.0.6</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <addResources>true</addResources>
                </configuration>
            </plugin>
        </plugins>
        <finalName>${project.artifactId}</finalName>
    </build>
</project>

error message

Errors occurred during the build.
Errors running builder 'Maven Project Builder' on project 'AsBuilt-MS'.
Could not calculate build plan: Plugin org.apache.maven.plugins:maven-war-plugin:3.2.2 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-war-plugin:jar:3.2.2
Plugin org.apache.maven.plugins:maven-war-plugin:3.2.2 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-war-plugin:jar:3.2.2
Could not calculate build plan: Plugin org.apache.maven.plugins:maven-war-plugin:3.2.2 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-war-plugin:jar:3.2.2
Plugin org.apache.maven.plugins:maven-war-plugin:3.2.2 or one of its dependencies could not be resolved: Failed to read artifact descriptor for org.apache.maven.plugins:maven-war-plugin:jar:3.2.2

so can anyone know how to solve this.

Answer 1

Since you are behind a corporate proxy, you need to configure two proxy entries in settings.xml: one for http another for https protocols.

<proxy> 
<id>http-proxy</id> 
<active>true</active> 
<protocol>http</protocol> 
<username>proxyuser</username> 
<password>proxypass</password> 
<host>proxy.host.net</host> 
<port>80</port> 
<nonProxyHosts>local.net|some.host.com</nonProxyHosts> 
</proxy> 

<proxy> 
<id>https-proxy</id> 
<active>true</active> 
<protocol>https</protocol> 
<username>proxyuser</username> 
<password>proxypass</password> 
<host>proxy.host.net</host> 
<port>80</port> 
<nonProxyHosts>local.net|some.host.com</nonProxyHosts> 
</proxy>