what is the cause of java.lang.StringIndexOutOfBoundsException: String index out of range: 1 in this simplified example of Rest Services?

Question

curl -X GET http://localhost:8080/julian/resources/MyRestService/convert/222

GlassFish Server Open Source Edition 5.1.0 - Error report

HTTP Status 500 - Internal Server Error

---

type Exception report

messageInternal Server Error

descriptionThe server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: java.lang.StringIndexOutOfBoundsException: String index out of range: 1

root cause

java.lang.StringIndexOutOfBoundsException: String index out of range: 1

note The full stack traces of the exception and its root causes are available in the GlassFish Server Open Source Edition 5.1.0 logs.

---

GlassFish Server Open Source Edition 5.1.0

(base)

package book.jakarta.julian;

import javax.websocket.server.PathParam;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Application;
/**
 * 
 * Rest Web Service
 *
 */
@ApplicationPath("/resources")
@Path("MyRestService")
public class Julian  extends Application {
        
    // http://localhost:8080/julian/resources/MyRestService/convert/0123
    @GET
    @Produces("text/plain") 
    @Path("convert/{inNum : .*}")
            
    public String add(
            @PathParam("inNum") String inNum) {
        
          // get first digit ignore rest 
          int intemp = Integer.parseInt(inNum.substring(0, 1));
            
          return "" + (intemp + 3) ;
      }
}

question from:https://stackoverflow.com/questions/65890112/what-is-the-cause-of-java-lang-stringindexoutofboundsexception-string-index-out

Answer 1

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