Different messages for CompletionException under different minor versions of Java 8 -

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i different output same code snippet under different minor version of java. not able find related ticket on open jdk bug tracker. 

completablefuture<string> completablefuture = new completablefuture<>(); completablefuture.complete("xxx");  completablefuture.thencompose(str -> {     completablefuture<string> completablefuture1 = new completablefuture<>();     completablefuture1.completeexceptionally(new exception("hello"));     return completablefuture1; }).exceptionally(ex -> {     system.out.println(ex.getmessage());     return null; }).get();

output under jdk 1.8.0_25:

hello

output under jdk 1.8.0_102:

java.lang.exception: hello

is newer 1 fix or regression? related ticket?

there's bug report here discussing change. key in javadoc of completablefuture#thencompose

returns new completionstage that, when stage completes normally, executed stage argument supplied function. see completionstage documentation rules covering exceptional completion.

and , class documentation of completionstage

in other cases, if stage's computation terminates abruptly (unchecked) exception or error, dependent stages requiring completion complete exceptionally well, with completionexception holding exception cause.

that's see here. function pass exceptionally receives completionexception holding exception completed triggering completablefuture.

the behavior see expected behavior.

you'll have unwrap cause of exceptional completion

throwable cause = ex.getcause(); // exception("hello")

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