Hi Paul, ----- Mail original ----- > De: "Paul Bakker" <paul.bakker...@gmail.com> > À: jigsaw-dev@openjdk.java.net > Envoyé: Vendredi 22 Avril 2016 10:52:23 > Objet: requires public for automatic modules > > Hello, > > I'm experimenting with automatic modules again. I have a module > "demonstrator" that uses Jackson Databind. > > import com.fasterxml.jackson.databind.ObjectMapper; > .... > ObjectMapper mapper = new ObjectMapper(); > String json = mapper.writeValueAsString(modularityBook); > > In module-info.java I have the following: > > requires jackson.databind; > > On the modulepath I have jackson.core, jackson.databind and > jackson.annotations. > Building results in an error: > > class file for com.fasterxml.jackson.core.Versioned not found > > This makes sense because the ObjectMapper class that I'm using implements the > Versioned interface (from jackson.core). > When generating a module-info.java using jdeps for the jackson.databind JAR > however, it generates the following: > > requires public jackson.annotations; > requires public jackson.core; > > This is much closer to what I would expect when using the jackson.databind > module. > When using jackson.databind as an automatic module, I will end up with a list > of requires for transitive dependencies that I shouldn't have to care about. > Why don't automatic modules take better care of transitive dependencies, so > that the application's module-info looks similar to what it would after > transforming the dependencies to named modules? >
because it will require the runtime to parse the bytecode of an automatic module, which is a slow operation. > Also, jdeps doesn't actually show this problem when looking at the code when > still on the classpath: > > jdeps -cp lib/jackson-databind-2.7.3.jar > out/com/javamodularity/demonstrator/Demo.class > > Demo.class -> lib/jackson-databind-2.7.3.jar > Demo.class -> java.base > com.javamodularity.demonstrator (Demo.class) > -> com.fasterxml.jackson.databind > jackson-databind-2.7.3.jar > -> java.io > -> java.lang > > Best regards, > > Paul Bakker > > > regards, Rémi
