[ https://issues.jboss.org/browse/LOGTOOL-124?page=com.atlassian.jira.plugi... ] James Perkins commented on LOGTOOL-124: --------------------------------------- Just to confirm. For a {{Function}} the signature must resolve to {{java.util.function.Function<String, Throwable>}} where {{String}} is the message. For a {{BiFunction}} the signature must resolve to {{java.util.function.BiFunction<String, Throwable, Throwable}} where the {{String}} is the message and the first {{Throwable}} is the cause. Does that sound correct? Example of the current output for a function: {code:java|title=Interface} @Message("The operation failed due to %s") <T extends Throwable> T operationFailed(@Producer Function<String, T> function, String op); {code} {code:java|title=Generated} private static final String operationFailed = "The operation failed due to %s"; protected String operationFailed$str() { return operationFailed; } @Override public final <T extends Throwable> T operationFailed(final java.util.function.Function<String, T> function, final String op) { final T result = function.apply(String.format(getLoggingLocale(), operationFailed$str(), op)); final StackTraceElement[] st = result.getStackTrace(); result.setStackTrace(Arrays.copyOfRange(st, 1, st.length)); return result; } {code} -- This message was sent by Atlassian JIRA (v7.2.3#72005)