Java7环境openapi-generator生成ApiClient编译报错，求适配配置

修复步骤 #

1. 补全Java7兼容的RESTEasy依赖

你选了resteasy作为生成客户端的底层库，缺失对应依赖导致javax.ws.rs.client包找不到，在pom.xml的<dependencies>节点添加如下适配Java7的依赖（3.x版本的RESTEasy兼容Java7，4.x及以上仅支持Java8+）：

<dependency>
    <groupId>org.jboss.resteasy</groupId>
    <artifactId>resteasy-client</artifactId>
    <version>3.15.6.Final</version>
</dependency>
<dependency>
    <groupId>org.jboss.resteasy</groupId>
    <artifactId>resteasy-jackson2-provider</artifactId>
    <version>3.15.6.Final</version>
</dependency>
<dependency>
    <groupId>javax.ws.rs</groupId>
    <artifactId>javax.ws.rs-api</artifactId>
    <version>2.1.1</version>
</dependency>

2. 修复AnyOf类找不到问题

这个问题来自三个原因，逐一调整：

• 首先删除本地com.company.project.jbpm.rest目录下所有之前生成的旧代码，避免旧文件引用错误的包路径（你报错里搜索的包是com.project.rest.model，和你配置的com.company.project.jbpm.rest.model不一致，就是旧代码残留导致）
• 在插件的<configOptions>节点新增两个配置，关闭Java7不支持的Nullable注解和anyOf默认生成逻辑：

<openApiNullable>false</openApiNullable>
<oneOfAnyOfImplementation>interface</oneOfAnyOfImplementation>

• 如果你的yaml文件里定义了oneOf/anyOf结构，Java7环境下建议简化yaml去掉这类多态定义，避免生成不兼容的类。

3. 补全maven编译版本配置

确保pom.xml里配置了maven-compiler-plugin指定编译级别为Java7：

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.8.1</version>
    <configuration>
        <source>1.7</source>
        <target>1.7</target>
        <encoding>UTF-8</encoding>
    </configuration>
</plugin>

调整后的openapi插件完整配置参考

<plugin>
    <groupId>org.openapitools</groupId>
    <artifactId>openapi-generator-maven-plugin</artifactId>
    <version>4.3.1</version>
    <executions>
        <execution>
            <id>regular</id>
            <goals>
                <goal>generate</goal>
            </goals>
            <configuration>
                <inputSpec>${project.basedir}/src/main/resources/META-INF/xyz.yaml</inputSpec>
                <generatorName>java</generatorName>
                <output>${project.basedir}</output>
                <generateApiTests>true</generateApiTests>
                <generateModelTests>false</generateModelTests>
                <withXml>true</withXml>
                <generateSupportingFiles>false</generateSupportingFiles>
                <skipValidateSpec>true</skipValidateSpec>
                <environmentVariables>
                    <supportingFiles>ApiClient.java,ApiResponse.java,ApiException.java,Configuration.java,JavaTimeFormatter.java,RFC3339DateFormat.java,JSON.java,Pair.java,ServerConfiguration.java,ServerVariable.java,StringUtil.java,Authentication.java,HttpBasicAuth.java,ApiKeyAuth.java,HttpBearerAuth.java</supportingFiles>
                </environmentVariables>
                <configOptions>
                    <apiPackage>com.company.project.jbpm.rest.api</apiPackage>
                    <modelPackage>com.company.project.jbpm.rest.model</modelPackage>
                    <dateLibrary>java7</dateLibrary>
                    <library>resteasy</library>
                    <useTags>true</useTags>
                    <!-- 新增Java7兼容配置 -->
                    <openApiNullable>false</openApiNullable>
                    <oneOfAnyOfImplementation>interface</oneOfAnyOfImplementation>
                </configOptions>
            </configuration>
        </execution>
    </executions>
</plugin>

配置调整完成后执行mvn clean compile重新生成代码并编译即可。

内容的提问来源于stack exchange，提问作者Sap