jsonschema2pojo maven plugin configuration in execution not considered

I am trying to use the jsonschema2pojo plugin for generating POJOs based on both schema and json sourceTypes. The configurations are specified per execution. But every time the plugin is reporting "One of sourceDirectory or sourcePaths must be provided". I am able to run it when the configuration is provided at the plugin level ( global ). But then I can only specify one sourceType.

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.jsonschema2pojo</groupId>
                <artifactId>jsonschema2pojo-maven-plugin</artifactId>
                <version>0.5.1</version>
                <executions>
                    <execution>
                        <id>generate-schema</id>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <configuration>
                            <outputEncoding>${project.build.sourceEncoding}</outputEncoding>
                            <outputDirectory>${project.build.directory}/generated-sources</outputDirectory>
                            <annotationStyle>jackson2</annotationStyle>
                            <generateBuilders>false</generateBuilders>
                            <initializeCollections>true</initializeCollections>
                            <refFragmentPathDelimiters>#/</refFragmentPathDelimiters>
                            <sourceType>jsonschema</sourceType>
                            <targetPackage>com.company.app.integration.sabre.stub.rest</targetPackage>
                            <sourceDirectory>${basedir}/src/main/resources/schema</sourceDirectory>
                        </configuration>
                    </execution>
                    <execution>
                        <id>generate-json</id>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <configuration>
                            <outputEncoding>${project.build.sourceEncoding}</outputEncoding>
                            <outputDirectory>${project.build.directory}/generated-sources</outputDirectory>
                            <annotationStyle>jackson2</annotationStyle>
                            <generateBuilders>false</generateBuilders>
                            <initializeCollections>true</initializeCollections>
                            <refFragmentPathDelimiters>#/</refFragmentPathDelimiters>
                            <sourceType>json</sourceType>
                            <targetPackage>com.company.app.integration.sabre.stub.rest</targetPackage>
                            <sourceDirectory>${basedir}/src/main/resources/json</sourceDirectory>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

        </plugins>
    </build>

Is there any way to have the plugin use the configuration at execution level per goal ?

Plugin version: 0.5.1