How to response with HTML page SparkJava

Question

I found this and this one answer but none of them worked. The first one works only for index.html(you do not need to specify path and stuff like that). The code from the second solution gives me NullPointerException although the file exists and Spark returns index.html.

Helper class

class Helper(){
   String renderContent(String htmlFile) {
       try {
           return new String(Files.readAllBytes(Paths.get(getClass().getResource(htmlFile).toURI())), StandardCharsets.UTF_8);
       } catch (IOException | URISyntaxException e) {
           e.printStackTrace();
           mailSendingList.add(e.toString());
       }
       return null;
   }
}

Routes

get("/404", (req, res) -> helper.renderContent("404.html"));

Exception

java.lang.NullPointerException
at Helper.renderContent(Helper.java:177)
at Main.lambda$main$1(Main.java:33)
at spark.SparkBase$1.handle(SparkBase.java:311)
at spark.webserver.MatcherFilter.doFilter(MatcherFilter.java:159)
at spark.webserver.JettyHandler.doHandle(JettyHandler.java:60)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:179)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:136)
at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
at org.eclipse.jetty.server.Server.handle(Server.java:451)
at org.eclipse.jetty.server.HttpChannel.run(HttpChannel.java:252)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:266)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.run(AbstractConnection.java:240)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:596)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:527)
at java.lang.Thread.run(Thread.java:745)

score 1 · Answer 1 · answered Oct 25 '16 at 16:32

1

check the return of getClass().getResource(htmlFile), this probably is null because the resource is not found.

If you have the file "404.html" and the root of your classpath, change your code to (notice the insertion of '/')

get("/404", (req, res) -> helper.renderContent("/404.html"));

answered Oct 25 '16 at 16:32

P.J.Meisch

18,013
6
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and what is the result of the `getResource(htmlFile)` call? Is this resource found? – P.J.Meisch Oct 26 '16 at 05:05
it throws me a NullPointer, but I've solved the problem. See the coment below the question – Oct 26 '16 at 08:28

score 1 · Accepted Answer · edited Oct 26 '16 at 21:10

1

My file path was wrong. Changing ("404.html") to ("public/404.html") helped.

edited Oct 26 '16 at 21:10

kaqqao

12,984
10
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answered Oct 26 '16 at 19:19

How to response with HTML page SparkJava

2 Answers2