How to print stack trace when an error occurs during annotation processing in Java

Question

I'm working on a Java library that has an annotation processor. To trap exceptions I wrote code similar to the following code:

public class KriptonProcessor extends AbstractProcessor {

  @Override
  public boolean process(final Set<? extends TypeElement> annotations, final RoundEnvironment roundEnv) {
    try {
        ...
        return true;
    } catch (Throwable e) {
        String msg = StringUtils.nvl(e.getMessage());
        error(null, e.getClass().getCanonicalName() + ": " + msg);
        e.printStackTrace();

    }

    return true;
  }
}

When an exception occurs, actually it's displayed as:

e: error: java.lang.NullPointerException:

While I was expecting the full stack trace, useful to detect where is the problem. Any ideas to accomplish this task?

Thanks in advance.

Are you able to put a breakpoint in your catch block using using a debugger? You should be able examine the contents of your Throwable object to check for the backtrace. https://stackoverflow.com/questions/2411487/nullpointerexception-in-java-with-no-stacktrace — sc_ray, Jul 31 '18 at 22:07
No, the error occurs at compile time. Breakpoint work within the program. — xcesco, Jul 31 '18 at 22:27

score -1 · Answer 1 · answered Jul 31 '18 at 21:23

-1

public class KriptonProcessor extends AbstractProcessor {

  @Override
  public boolean process(final Set<? extends TypeElement> annotations, final RoundEnvironment roundEnv) {
    try {
        ...
        return true;
    } catch (Throwable e) {
        e.printStackTrace();
        return false;

    }

    return true;
  }
}

answered Jul 31 '18 at 21:23

Dan

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then a `Throwable` is not being thrown – Dan Aug 01 '18 at 01:17

How to print stack trace when an error occurs during annotation processing in Java

1 Answers1