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Added error handling policies for javax-servlets module

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This commit is contained in:
Timoteo Ponce
2018-06-11 09:48:24 -04:00
parent a54c9e0c9e
commit 3d602e6398
5 changed files with 77 additions and 3 deletions
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34
javax-servlets/src/main/java/com/baeldung/servlets/ErrorHandlerServlet.java Normal file
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package com.baeldung.servlets;
import javax.servlet.annotation.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import static javax.servlet.RequestDispatcher.*;
@WebServlet(urlPatterns = "/errorHandler")
public class ErrorHandlerServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
resp.setContentType("text/html; charset=utf-8");
try (PrintWriter writer = resp.getWriter()) {
writer.write("<html><head><title>Error description</title></head><body>");
writer.write("<h2>Error description</h2>");
writer.write("<ul>");
Arrays.asList(ERROR_STATUS_CODE, ERROR_EXCEPTION_TYPE, ERROR_MESSAGE)
.forEach(e ->
writer.write("<li>" + e + ":" + req.getAttribute(e) + " </li>")
);
writer.write("</ul>");
writer.write("</html></body>");
}
Exception exception = (Exception) req.getAttribute(ERROR_EXCEPTION);
if (IllegalArgumentException.class.isInstance(exception)) {
getServletContext().log("Error on an application argument", exception);
}
}
}

13
javax-servlets/src/main/java/com/baeldung/servlets/RandomErrorServlet.java Normal file
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package com.baeldung.servlets;
import javax.servlet.annotation.*;
import javax.servlet.http.*;
@WebServlet(urlPatterns = "/randomError")
public class RandomErrorServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, final HttpServletResponse resp) {
throw new IllegalStateException("Random error");
}
}