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

Question

我在 MobileFirst Java 适配器上执行添加时得到以下信息 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

您的问题出在适配器的 return 类型上。因为你正在 returning 一个 int 它试图将它转换成一个 string 而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);
    }
}