Stream.of should not be used with null. https://docs.oracle.com/javase/9/docs/api/java/util/stream/Stream.html#of-T-
I think you'd be right if it were Stream.ofNullable, and there does appear to be a bug in that code (never appended to sb) - thanks for pointing that out... Thanks, -Andrew -----Original Message----- From: core-libs-dev <core-libs-dev-boun...@openjdk.java.net> On Behalf Of ?????? ??????? Sent: Saturday, December 29, 2018 11:23 PM To: core-libs-dev <core-libs-dev@openjdk.java.net> Subject: latest changes in java.lang.Class Hi, looking into Class::methodToString I've found some changes done into it recently in JDK 11 repository. Currently the method looks like this: private String methodToString(String name, Class<?>[] argTypes) { StringBuilder sb = new StringBuilder(); sb.append(getName() + "." + name + "("); if (argTypes != null) { Stream.of(argTypes).map(c -> {return (c == null) ? "null" : c.getName();}). collect(Collectors.joining(",")); } sb.append(")"); return sb.toString(); } Here result of Stream.collect() is ignored, i. e. even when condition argTypes != null is true nothing is appended to sb. It seems in this case we either don’t need this `if` branch or need to append to sb. Am I missing something? Kind regards, Sergey Tsypanov