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
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