java - IBM Mobilefirst 7.0-Java 适配器无法在服务器端执行

Question

执行添加时，我在 MobileFirst Java Adapter 上得到以下信息 Error 500: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String

@Path("/calc")
public class Calculator {
    @Context
    HttpServletRequest request;
    //Define the server api to be able to perform server operations
    WLServerAPI api = WLServerAPIProvider.getWLServerAPI();
    @GET
    @Path("/addTwoIntegers/{first}/{second}")
    public int addTwoIntegers(@PathParam("first") String first, @PathParam("second") String second){
        int a=Integer.parseInt(first);
        int b=Integer.parseInt(second);
        int c=a+b;
       return c;
    }
}

Answer 1

您的问题在于适配器的返回类型。由于您要返回 aint它正在尝试将其转换为 astring并且那是它失败的时候，因此Error 500: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String

尝试按如下方式更新您的代码：

@Path("/calc")
public class Calculator {
    @Context
    HttpServletRequest request;
    //Define the server api to be able to perform server operations
    WLServerAPI api = WLServerAPIProvider.getWLServerAPI();
    @GET
    @Path("/addTwoIntegers/{first}/{second}")
    public String addTwoIntegers(@PathParam("first") String first, @PathParam("second") String second){
        int a=Integer.parseInt(first);
        int b=Integer.parseInt(second);
        int c=a+b;
       return Integer.toString(c);
    }
}