How to set FAIL_ON_UNKNOWN_PROPERTIES to false in openapi-generator-maven-plugin

Question

I am using openapi-generator-maven-plugin to generate Java files from the swagger yaml files. After conversion, the generated ObjectMapper is configured as FAIL_ON_UNKNOWN_PROPERTIES as true so the ObjectMapper will fail if receiving unknown properties. Can I set additional tags in the pom file's plugin so the auto-generated FAIL_ON_UNKNOWN_PROPERTIES can be false instead of the default true? The module is on Java 17/Spring3/openapi-generator-maven-plugin 6.6.0.

public class JSON implements ContextResolver<ObjectMapper> {  
    public JSON() {
          mapper = JsonMapper.builder()
            .serializationInclusion(JsonInclude.Include.NON_NULL)
            .configure(MapperFeature.ALLOW_COERCION_OF_SCALARS, false)
            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, true)
            .configure(DeserializationFeature.FAIL_ON_INVALID_SUBTYPE, true)
            .disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS)
            .enable(SerializationFeature.WRITE_ENUMS_USING_TO_STRING)
            .enable(DeserializationFeature.READ_ENUMS_USING_TO_STRING)
            .defaultDateFormat(new RFC3339DateFormat())
            .addModule(new JavaTimeModule())
            .addModule(new JodaModule())
            .addModule(new JsonNullableModule())
            .build();
  }
}


<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.1.3</version>
        <relativePath /> 
    </parent>
    <groupId>com.bc.gov.open</groupId>
    <artifactId>jag-vips-client</artifactId>
    <version>0.2.0</version>
    <name>jag-vips-client</name>
    <description>A java client for VIA database</description>

    <properties>
        <log4j2.version>2.17.1</log4j2.version>
        <java.version>17</java.version>
        <!-- include properties that are specific to dpsvalidationservice -->
        <default-package>com.bc.gov.open.ordsviasclient</default-package>
        <maven-plugin-version>1.0.0</maven-plugin-version>
        <org.glassfish.jersey.version>3.1.5</org.glassfish.jersey.version>
        <com.fasterxml.jackson.version>2.15.2</com.fasterxml.jackson.version>
        <javax.xml.bind.version>2.3.1</javax.xml.bind.version>
    </properties>

    <profiles>
        <profile>
            <id>openshift</id>
            <distributionManagement>
                <snapshotRepository>
                    <id>nexus-snapshots</id>
                    <url>${env.NEXUS_SNAPSHOTS_URL}</url>
                </snapshotRepository>
                <repository>
                    <id>nexus-releases</id>
                    <url>${env.NEXUS_RELEASES_URL}</url>
                </repository>
            </distributionManagement>
        </profile>
    </profiles>

    <dependencies>

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

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.9</version>
        </dependency>

        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>

        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.14</version>
        </dependency>

        <dependency>
            <groupId>com.googlecode.json-simple</groupId>
            <artifactId>json-simple</artifactId>
            <version>1.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.core</groupId>
            <artifactId>jersey-client</artifactId>
            <version>${org.glassfish.jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-multipart</artifactId>
            <version>${org.glassfish.jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-json-jackson</artifactId>
            <version>${org.glassfish.jersey.version}</version>
        </dependency>

        <dependency>
            <groupId>org.glassfish.jersey.inject</groupId>
            <artifactId>jersey-hk2</artifactId>
            <version>${org.glassfish.jersey.version}</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.findbugs</groupId>
            <artifactId>jsr305</artifactId>
            <version>3.0.2</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-xml</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.jaxrs</groupId>
            <artifactId>jackson-jaxrs-base</artifactId>
            <version>${com.fasterxml.jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>${com.fasterxml.jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>${com.fasterxml.jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>${com.fasterxml.jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.jaxrs</groupId>
            <artifactId>jackson-jaxrs-json-provider</artifactId>
            <version>${com.fasterxml.jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>org.openapitools</groupId>
            <artifactId>jackson-databind-nullable</artifactId>
            <version>0.2.1</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-joda</artifactId>
            <version>${com.fasterxml.jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>joda-time</groupId>
            <artifactId>joda-time</artifactId>
            <version>2.12.5</version>
        </dependency>

        <!-- Base64 encoding that works in both JVM and Android -->
        <dependency>
            <groupId>com.brsanthu</groupId>
            <artifactId>migbase64</artifactId>
            <version>2.2</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api -->
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-core</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jsr310</artifactId>
            <version>2.16.0</version>
        </dependency>

        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>${javax.xml.bind.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.22.0</version>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-failsafe-plugin</artifactId>
                 <version>2.22.0</version>
            </plugin>

            <plugin>
                <groupId>org.openapitools</groupId>
                <artifactId>openapi-generator-maven-plugin</artifactId>
                <version>6.6.0</version>
                <executions>
                    <execution>
                        <id>spring-boot-api</id>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                        <configuration>
                            <inputSpec>${project.basedir}/viasords.yaml</inputSpec>
                            <generatorName>java</generatorName>
                            <configOptions>
                                <dateLibrary>joda</dateLibrary>
                                <validateSpec>false</validateSpec>
                                <useSpringBoot3>true</useSpringBoot3>
                                <useJakartaEe>true</useJakartaEe>
                            </configOptions>
                            <library>jersey2</library>
                            <apiPackage>${default-package}.api</apiPackage>
                            <modelPackage>${default-package}.api.model</modelPackage>
                            <invokerPackage>${default-package}.api.handler</invokerPackage>
                            <generateModelTests>false</generateModelTests>
                            <generateApiTests>false</generateApiTests>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>17</source>
                    <target>17</target>
                </configuration>
            </plugin>

            <plugin>
                <artifactId>maven-deploy-plugin</artifactId>
                <executions>
                    <execution>
                        <id>default-deploy</id>
                        <phase>deploy</phase>
                        <goals>
                            <goal>deploy</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

        </plugins>
    </build>

</project>

Answer 1

One way to handle it using maven-antrun-plugin like this:

<plugin>
    <artifactId>maven-antrun-plugin</artifactId>
    <executions>
        <execution>
            <phase>process-sources</phase>
            <configuration>
                <target>
                    <replace token="mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, true)"
                             value="mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)"
                             dir="target/generated-sources/openapi">
                        <include name="**/our_generated_client/invoker/JSON.java"/>
                    </replace>
                </target>
            </configuration>
            <goals>
                <goal>run</goal>
            </goals>
        </execution>
    </executions>
</plugin>

You can also @Provide a contextResolver which would change it on runtime

@Provider
public class ObjectMapperResolver implements ContextResolver<ObjectMapper> {
    private ObjectMapper mapper;

    public ObjectMapperResolver() {
        mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    }

    @Override
    public ObjectMapper getContext(Class<?> cls) {
        return mapper;
    }
}