How do I catch NoSuchFileException from Util.readFileToString(), hiding behind a VertxException

Kegan Holtzhausen

unread,

Feb 24, 2016, 6:51:05 AM2/24/16

to vert.x

Hi,

I have the following line of code:

String loc = adjustLocation(templateFileName);
String templateText = Utils.readFileToString(context.vertx(), loc);

And if my templateFile does not exist, I get the following stack:

INFO: Compiling Template: templates/blog2
io.vertx.core.VertxException: io.vertx.core.file.FileSystemException: java.nio.file.NoSuchFileException: templates/blog2.templ
	at io.vertx.ext.web.impl.Utils.readFileToString(Utils.java:166)
	at com.deblox.web.templ.impl.DxTemplateEngineImpl.getTemplate(DxTemplateEngineImpl.java:130)
	at com.deblox.web.templ.impl.DxTemplateEngineImpl.render(DxTemplateEngineImpl.java:112)
	at io.vertx.ext.web.handler.impl.TemplateHandlerImpl.handle(TemplateHandlerImpl.java:44)
	at io.vertx.ext.web.handler.impl.TemplateHandlerImpl.handle(TemplateHandlerImpl.java:28)
	at io.vertx.ext.web.impl.RouteImpl.handleContext(RouteImpl.java:221)

Now my problem comes from when I wrap the readFileToString in a try / catch, I am unable to catch anything except a VertxException. So how do I catch a NoSuchFileException? and deal with it accordingly?

      try {
        String templateText = Utils.readFileToString(context.vertx(), loc);
      } catch (NoSuchFileException e) {
        logger.error("No such template");
      }

/Kegan

Alexander Lehmann

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Feb 24, 2016, 7:26:10 AM2/24/16

to vert.x

I think you have to catch VertxException and peek inside the exception with cause to get the actual exception.

 try {
        String templateText = Utils.readFileToString(context.vertx(), loc);

      } catch (VertxException e) {
        if(e.cause instanceOf FileSystemException) {

          logger.error("No such template");

        } else {
          throw e;
        }
      }

or similar

Kegan Holtzhausen

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Feb 25, 2016, 10:03:01 AM2/25/16

to vert.x

Thanks, I finally got it to work with nested getCause()'s.

try {

        templateText = Utils.readFileToString(context.vertx(), loc);
      } catch (VertxException e) {

        if (e.getCause().getCause() instanceof NoSuchFileException) {
          logger.error("No such template file " + loc);
          throw new NoSuchFileException("No such template file " + loc);
        } else {
          logger.error("Some other error " + e.getCause().getCause());
          throw e;
        }
      }

/K

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