On 14 June 2012 02:15, Gilles Sadowski <gil...@harfang.homelinux.org> wrote: > Hello. > >> > [...] > > The following: > >> >> > I should be able to do all combinations, i.e.: >> >> > 1. Compile with javac 1.6 and run with java 1.6 >> >> > 2. Compile with javac 1.7 and run with java 1.7 > > is achieved by those respective commands: > > $ JAVA_1_6_HOME=/usr/lib/jvm/java-6-sun mvn -X -Pjava-1.6 clean test > $ JAVA_1_7_HOME=/usr/lib/jvm/java-7-openjdk-amd64 mvn -X -Pjava-1.7 clean > test > > IIUC: > JAVA_x_y_HOME is used to locate the "javac" executable
Sort of. > -Pjava-x.y selects the language level -P selects the profile, which uses the relevant JAVA_1_n_HOME variable to locate the relevant Java installation. These variable were introduced specifically to support the java-x.y profiles. > JAVA_HOME has no effect > > This, however, > >> >> > 3. Compile with javac 1.6 and run with java 1.7 > > is not so easy. To run the tests with 1.7, one needs > > $ JAVA_1_6_HOME=/usr/lib/jvm/java-6-sun mvn > -Dcommons.surefire.java=/usr/lib/jvm/java-7-openjdk-amd64/bin/java -X > -Pjava-1.6 clean test >> > [...] > > Much to my surprise, this > > $ JAVA_1_7_HOME=/usr/lib/jvm/java-7-openjdk-amd64 mvn > -Dcommons.surefire.java=/usr/lib/jvm/java-6-sun/bin/java -X -Pjava-1.7 clean > test > > (i.e. using java 1.6 to run classes compiled with javac 1.7) also works! Is > that expected? [I thought I'd get the "incompatible major.minor version" > exception.] Unless you are using an updated version of the parent pom, the profile java-1.7 does not exist - this should report an error, but it might get lost in the -X output - so the compilation will use your default java compiler. > > Best regards, > Gilles > > --------------------------------------------------------------------- > To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org > For additional commands, e-mail: dev-h...@commons.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@commons.apache.org For additional commands, e-mail: dev-h...@commons.apache.org
