mobilefirst - Java 适配器中的响应类型

Question

我有一个 class（存储在 server/java 中）returns 一个响应类型对象，我想在适配器中使用它。

public class CorsResponse {
public static Response build() {
    return Response
            .ok()
            .header("Access-Control-Allow-Origin", "*")
            .header("Access-Control-Allow-Methods", "GET, POST")
            .header("Access-Control-Allow-Headers", "accept, origin, content-type")
            .header("Access-Control-Max-Age", "1728000")
            .build();
}

如果我在适配器的方法中使用这个 class，我会得到一个异常：

javax.servlet.ServletException: java.lang.LinkageError: loader constraint violation: loader (instance of com/ibm/ws/classloading/internal/AppClassLoader) previously initiated loading for a different type with name "javax/ws/rs/core/Response" ...

Caused by: java.lang.LinkageError: loader constraint violation: loader (instance of com/ibm/ws/classloading/internal/AppClassLoader) previously initiated loading for a different type with name "javax/ws/rs/core/Response"

如何设置要加载的响应类型？

Answer 1

如果您对 CorsFilter 感兴趣，我建议像下面所示那样实现它，并将 class 添加到您的 Application 中...

@Provider
public class ResponseCorsFilter implements ContainerResponseFilter {

    @Override
    public void filter(ContainerRequestContext requestContext,
            ContainerResponseContext responseContext) throws IOException {

        responseContext.getHeaders().add("Access-Control-Allow-Origin", "*");
        responseContext.getHeaders().add("Access-Control-Allow-Methods", "GET, POST, OPTIONS");


        String reqHead = requestContext.getHeaderString("Access-Control-Request-Headers");

        if(null != reqHead && !reqHead.equals("")){
            responseContext.getHeaders().add("Access-Control-Allow-Headers", reqHead);
        }

    }


}

Answer 2

我设法创建了一个外部项目，将 class 放在那里，将其编译成一个 jar 文件并将其包含在 adapters/adapter_name/lib 文件夹中（也添加到构建路径）。

mobilefirst - Java 适配器中的响应类型

mobilefirst - Response type in Java adapters

java

jax-rs

ibm-mobilefirst

mobilefirst-adapters