If I'm not mistaken compiler will not fail in this case BUT the application will fail in runtime (in case Java 1.5 is used) due to StringBuilder class is missing in JDK
On Mon, Mar 30, 2015 at 1:20 PM, Lin Ma <[email protected]> wrote: > Thanks Sebastian, > > 1. I am using JDK 1.7/1.8 for both development and deployment in runtime, > shall I change 1.5 of source and target to 1.7/1.8? > > 2. In your example, "for example you can write source code using a JDK 1.6 > which is compliant to Java 1.5. However you can also use the StringBuilder > class which does not exist in Java 1.5", I think using JDK 1.6 specific > feature but using 1.5 complier will fail? No? Please feel free to correct > me. > > regards, > Lin > > On Mon, Mar 30, 2015 at 12:14 AM, Sebastian Oerding < > [email protected]> wrote: > > > source -> The level (JDK version) to which the source code must be > > compliant to, for example you can write source code using a JDK 1.6 which > > is compliant to Java 1.5. However you can also use the StringBuilder > class > > which does not exist in Java 1.5 > > target -> The class version of the generated class files. The class > format > > changes with some Java version, for example as some stuff may be added > for > > performance reason. For example if a new byte code instruction comes up > > (like 'invokedynamic') this really makes a change. Or another example > (I'm > > not really sure about it): As far as I think a stack map has been added > > from Java 5 to Java 1.6. This should improve performance and makes subtle > > differences when ClassNotFoundException are thrown. You can use a JDK to > > compile code for different but lower versions. This way can benefit from > > some optimizations which weren't available with the old JDK and are > > compatible. > > > > With regards > > Sebastian > > > > -----Ursprüngliche Nachricht----- > > Von: Lin Ma [mailto:[email protected]] > > Gesendet: Montag, 30. März 2015 07:46 > > An: Maven Users List > > Betreff: about source and target in maven-compiler-plugin > > > > Hello Maven masters, > > > > For maven-compiler-plugin(a sample below), have a quick question. I read > > this document (http://maven.apache.org/plugins/maven-compiler-plugin/), > > and confused what means source and target 1.5 here, it seems it is an > > internal version number of Maven, independent of JDK? > > > > <plugin> > > <artifactId>maven-compiler-plugin</artifactId> > > <version>2.3.2</version> > > <configuration> > > <source>1.5</source> > > <target>1.5</target> > > </configuration> > > </plugin> > > > > thanks in advance, > > Lin > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [email protected] > > For additional commands, e-mail: [email protected] > > > -- WBR Maxim aka solomax
