[java] How to log as much information as possible for a Java Exception?

What's wrong with the printStacktrace() method provided by Throwable (and thus every exception)? It shows all the info you requested, including the type, message, and stack trace of the root exception and all (nested) causes. In Java 7, it even shows you the information about "supressed" exceptions that might occur in a try-with-resources statement.

Of course you wouldn't want to write to System.err, which the no-argument version of the method does, so instead use one of the available overloads.

In particular, if you just want to get a String:

  Exception e = ...
  StringWriter sw = new StringWriter();
  e.printStackTrace(new PrintWriter(sw));
  String exceptionDetails = sw.toString();

If you happen to use the great Guava library, it provides a utility method doing this: com.google.common.base.Throwables#getStackTraceAsString(Throwable).

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