Maven trouble when trying to generate from WSDL file

Question

Im trying to generate sources from a wsdl file, but I keep running into an error on my pom.xml that I believe might be my issue? Below is the error that I get from my pom, and my pom file. Also I cannot build the project with "mvn clean install". I just seem to get an error with no real cause.

The error at the generates tag:

Execution default of goal org.jvnet.jaxb2.maven2:maven-jaxb2-plugin:0.12.3:generate failed: A required class was missing while executing org.jvnet.jaxb2.maven2:maven-jaxb2-plugin:0.12.3:generate: com/sun/codemodel/CodeWriter
-----------------------------------------------------
realm =    plugin>org.jvnet.jaxb2.maven2:maven-jaxb2-plugin:0.12.3-715230752
strategy = org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy
urls[0] = file:/C:/Users/Windows/.m2/repository/org/jvnet/jaxb2/maven2/maven-jaxb2-plugin/0.12.3/maven-jaxb2-plugin-0.12.3.jar
urls[1] = file:/C:/Users/Windows/.m2/repository/org/jvnet/jaxb2/maven2/maven-jaxb2-plugin-core/0.12.3/maven-jaxb2-plugin-core-0.12.3.jar
urls[2] = file:/C:/Users/Windows/.m2/repository/org/slf4j/slf4j-api/1.7.7/slf4j-api-1.7.7.jar
urls[3] = file:/C:/Users/Windows/.m2/repository/org/apache/commons/commons-lang3/3.2.1/commons-lang3-3.2.1.jar
urls[4] = file:/C:/Users/Windows/.m2/repository/com/sun/org/apache/xml/internal/resolver/20050927/resolver-20050927.jar
urls[5] = file:/C:/Users/Windows/.m2/repository/junit/junit/4.8.1/junit-4.8.1.jar
urls[6] = file:/C:/Users/Windows/.m2/repository/org/codehaus/plexus/plexus-utils/1.5.15/plexus-utils-1.5.15.jar
urls[7] = file:/C:/Users/Windows/.m2/repository/org/jvnet/jaxb2/maven2/maven-jaxb22-plugin/0.12.3/maven-jaxb22-plugin-0.12.3.jar
urls[8] = file:/C:/Users/Windows/.m2/repository/org/glassfish/jaxb/jaxb-runtime/2.2.11/jaxb-runtime-2.2.11.jar
urls[9] = file:/C:/Users/Windows/.m2/repository/org/glassfish/jaxb/jaxb-xjc/2.2.11/jaxb-xjc-2.2.11.jar
urls[10] = file:/C:/Users/Windows/.m2/repository/org/apache/maven/plugin-tools/maven-plugin-annotations/3.2/maven-plugin-annotations-3.2.jar
Number of foreign imports: 5
import: Entry[import org.sonatype.plexus.build.incremental from realm ClassRealm[plexus.core, parent: null]]
import: Entry[import org.codehaus.plexus.util.Scanner from realm ClassRealm[plexus.core, parent: null]]
import: Entry[import org.codehaus.plexus.util.DirectoryScanner from realm ClassRealm[plexus.core, parent: null]]
import: Entry[import org.codehaus.plexus.util.AbstractScanner from realm ClassRealm[plexus.core, parent: null]]
import: Entry[import  from realm ClassRealm[maven.api, parent: null]]

-----------------------------------------------------
 (org.jvnet.jaxb2.maven2:maven-jaxb2-plugin:0.12.3:generate:default:generate-sources)

my pom.xml file :

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.ws</groupId>
        <artifactId>spring-ws-core</artifactId>
    </dependency>
    <dependency>
        <groupId>com.bigthunk</groupId>
        <artifactId>BigThunkCore</artifactId>
        <version>0.0.7-SNAPSHOT</version>
    </dependency>
    <dependency>
        <groupId>com.bigthunk</groupId>
        <artifactId>BigThunkWeb</artifactId>
        <version>0.0.4-SNAPSHOT</version>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
        <!-- tag::wsdl[] -->
        <plugin>
            <groupId>org.jvnet.jaxb2.maven2</groupId>
            <artifactId>maven-jaxb2-plugin</artifactId>
            <executions>
                <execution>
                    <goals>
                        <goal>generate</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <schemaLanguage>WSDL</schemaLanguage>
                <generatePackage>hello.wsdl</generatePackage>
                <forceRegenerate>true</forceRegenerate>
                <schemas>
                    <schema>
                        <url>http://172.19.137.21:8280/services/umarketsc?wsdl</url>
                    </schema>
                </schemas>
            </configuration>
        </plugin>
        <!-- end::wsdl[] -->
    </plugins>
</build>

<repositories>
    <repository>
        <id>project.local</id>
        <name>project</name>
        <url>file:${project.basedir}/repo</url>
    </repository>
    <repository>
        <id>spring-releases</id>
        <name>Spring Releases</name>
        <url>https://repo.spring.io/libs-release</url>
    </repository>
</repositories>
<pluginRepositories>
    <pluginRepository>
        <id>spring-releases</id>
        <url>https://repo.spring.io/libs-release</url>
    </pluginRepository>
</pluginRepositories>

Answer 1

Enclosing the <plugins> tag inside <pluginManagement> tag (as detailed here: How to solve "Plugin execution not covered by lifecycle configuration" for Spring Data Maven Builds) fixed the issue for me.