java - How do I find which class is printing an error? -


i have java program, using vertx 2, , when run it, message:

% vertx run -cluster com.abc.prep.manager.prepstartup -cp ./build/libs/operational-all-1.0.jar -conf safe.conf starting clustering...  no cluster-host specified using address 172.17.0.1  [fatal error] :6:3: element type "hr" must terminated matching end-tag "</hr>". prep starting up! succeeded in deploying verticle

i cannot figure out '[fatal error]' message coming from. if knows vertx doing (since think it's coming there), great.

but real question is: how find out printing that? class in jar? can't seem set breakpoint in system.out or system.err catches (i'm using intellij). can override (all) output prints stacktrace?

how find printing that? can't speak specifics vertx 2, i've had track down plenty of mysterious errors. general pattern, applied far possible yours:

  1. get idea of error is. google static (would same anybody) elements in error message. here, "must terminated matching end-tag". adding "vertx" query gave me links, didn't see instant answers. did find out it's xmlstreamexception. might able breakpoint on that.
  2. assuming didn't work, search code base text, looking same static text. armed knowledge google investigation, should able narrow down results manageable number check.
  3. if search finds nothing, make sure have source files attached in module can source files for. retry step 2.
  4. once you've found code throws error, should able put breakpoint.

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