It won't always work. Read a blog post detailing the problem once but can't find it right now. Looking at http://www.oracle.com/technetwork/java/javase/8-compatibility-guide-2156366.html#A999198 there's a list of behavioural changes
On Thu, Nov 27, 2014, 22:33 Igor Fedorenko <i...@ifedorenko.com> wrote: > Out of curiosity, why do you want to get exactly the same bytecode? Does > the code compiled with java8 not work under java7? > > -- > Regards, > Igor > > On 2014-11-27, 15:39, Mark Struberg wrote: > > Hi! > > > > Today I had a discussion with Robert about how we can solve a problem I > had over at Apache OpenWebBeans: > > > > https://issues.apache.org/jira/browse/OWB-952 > > > > As a short summary: the classes provided in rt.jar of Java8 are slightly > different than the ones from Java7 and 6. Similar big differences have been > seen in the Java4 to 5 transition. > > Thus if you compile your project with Java8 you might get different > bytecode than when compiling with Java7 JDK. Even if you use target=1.7 in > both cases. > > > > There are 2 options: either use javac -bootclasspath and point it to the > 'correct' rt.jar + other jdk libs, or just switch the whole environment. > > > > Roberts suggestion was to use the Maven Toolchain system: > http://maven.apache.org/plugins/maven-toolchains-plugin/ > > http://maven.apache.org/plugins/maven-toolchains- > plugin/toolchains/jdk.html > > > > > > We also elaborated about improving the Toolchain lookup in our > maven-compiler-plugin: > > http://maven.apache.org/plugins/maven-compiler-plugin/ > xref/org/apache/maven/plugin/compiler/AbstractCompilerMojo.html#427 > > > > This could get improved to first check if a toolchain is registered for > the <target> version used in the m-compiler-p. And if there is no toolchain > configured especially for this version then we fallback to the one if we > don't specify a version. > > The effective lookup path would then be > > 1.) toolchain configured via maven-toolchain-plugin > > 2.) toolchain with specified target version > > 3.) default toolchain > > > > > > I think we would need to slightly enhance the ToolchainManager, but > first would like to get some feedback. > > > > > > LieGrue, > > strub > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: dev-unsubscr...@maven.apache.org > > For additional commands, e-mail: dev-h...@maven.apache.org > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@maven.apache.org > For additional commands, e-mail: dev-h...@maven.apache.org > >
