Can't you do something like this to force the rt.jar to be 1.4? http://java.sun.com/j2se/1.5.0/docs/tooldocs/windows/javac.html
% javac -target 1.4 -bootclasspath jdk1.4.2/lib/classes.zip -extdirs "" OldCode.java On Dec 20, 2007 10:11 AM, Simon Kitching <[EMAIL PROTECTED]> wrote: > This problem happens no matter what java versions are being talked about. > When the aim is to support java N, but the latest is java X then it is > difficult to prevent accidents. > > Compiler property "source" prevents the use of *language features* that are > not supported in the specified version > > Compiler property "target" ensures that the generated bytecode is readable by > the specified version. > > But nothing checks that you are using only APIs provided by the runtime > library distributed by that version. Currently the only way to do that is to > compile against the runtime lib distributed with that version (which > basically means *using* that version to compile). > > The CLIRR project does binary-compatibility testing on jars. I have always > suspected that it would only need a minor enhancement to generate an "API > summary" for the rt.jar of version N of java, and then to be able to > automatically check that an app only makes calls to the APIs defined by that > summary file. Just need that old 40 hour day in order to get time to do it :-) > > Cheers, Simon > > ---- Matthias Wessendorf <[EMAIL PROTECTED]> schrieb: > > I'd be fine with Java5 instead of 1.4 > > > > -M > > > > On Dec 20, 2007 3:37 PM, Martin Marinschek <[EMAIL PROTECTED]> wrote: > > > yes, that is what I'm saying. > > > > > > Saying that this is a bug is maybe pushing it too hard... the > > > attributes just translate into a compiler language level - that does > > > not mean that someone automagically knows all API changes from 1.4 to > > > 1.6 and automatically applies them. The only chance for you to catch > > > all these problems is to actually compile with 1.4. > > > > > > > > > regards, > > > > > > Martin > > > > > > On 12/20/07, Matthias Wessendorf <[EMAIL PROTECTED]> wrote: > > > > So, > > > > > > > > you say that a configuration like: > > > > > > > > <plugin> > > > > <groupId>org.apache.maven.plugins</groupId> > > > > <artifactId>maven-compiler-plugin</artifactId> > > > > <inherited>true</inherited> > > > > <configuration> > > > > <source>1.5</source> > > > > <target>1.5</target> > > > > </configuration> > > > > </plugin> > > > > > > > > > > > > does allow you to use JDK6 methods? > > > > That would be a bad bug, IMO. > > > > > > > > -M > > > > > > > > On Dec 20, 2007 3:22 PM, Martin Marinschek <[EMAIL PROTECTED]> > > > > wrote: > > > > > Yes, so 1.5/1.6 syntax will correctly be found and disallowed. But API > > > > > changes are not checked for, so a newly added method will not be > > > > > found. > > > > > > > > > > > > > > > regards, > > > > > > > > > > Martin > > > > > > > > > > On 12/20/07, Matthias Wessendorf <[EMAIL PROTECTED]> wrote: > > > > > > On Dec 20, 2007 3:19 PM, Matthias Wessendorf <[EMAIL PROTECTED]> > > > > > > wrote: > > > > > > > I thought the compile was configured for source/target not 1.5 || > > > > > > > 1.6 > > > > > > > > > > > > (the compiler plugin) > > > > > > > > > > > > > > > > > > > > -M > > > > > > > > > > > > > > > > > > > > > On Dec 20, 2007 3:18 PM, Martin Marinschek > > > > <[EMAIL PROTECTED]> > > > > > > wrote: > > > > > > > > No - if you are building with 1.6, it won't. Only the language > > > > > > > > level > > > > is > > > > > > checked. > > > > > > > > > > > > > > > > regards, > > > > > > > > > > > > > > > > Martin > > > > > > > > > > > > > > > > > > > > > > > > On 12/20/07, Matthias Wessendorf <[EMAIL PROTECTED]> wrote: > > > > > > > > > On Dec 20, 2007 2:45 PM, <[EMAIL PROTECTED]> wrote: > > > > > > > > > > Author: skitching > > > > > > > > > > Date: Thu Dec 20 05:45:06 2007 > > > > > > > > > > New Revision: 605927 > > > > > > > > > > > > > > > > > > > > URL: http://svn.apache.org/viewvc?rev=605927&view=rev > > > > > > > > > > Log: > > > > > > > > > > Remove accidental use of java 1.6 method String.isEmpty > > > > > > > > > > > > > > > > > > isn't the build catching this ? > > > > > > > > > > > > > > > > > > -M > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Modified: > > > > > > > > > > > > > > > > > > > > > > > > > > > > > myfaces/tomahawk/trunk/core/src/main/java/org/apache/myfaces/dateformat/SimpleDateFormatter.java > > > > > > > > > > > > > > > > > > > > Modified: > > > > > > > > > > > > > > > > > > > myfaces/tomahawk/trunk/core/src/main/java/org/apache/myfaces/dateformat/SimpleDateFormatter.java > > > > > > > > > > URL: > > > > > > > > > > > > > > > > > > > http://svn.apache.org/viewvc/myfaces/tomahawk/trunk/core/src/main/java/org/apache/myfaces/dateformat/SimpleDateFormatter.java?rev=605927&r1=605926&r2=605927&view=diff > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ============================================================================== > > > > > > > > > > --- > > > > > > > > > > > > > > > > > > > myfaces/tomahawk/trunk/core/src/main/java/org/apache/myfaces/dateformat/SimpleDateFormatter.java > > > > > > > > > (original) > > > > > > > > > > +++ > > > > > > > > > > > > > > > > > > > myfaces/tomahawk/trunk/core/src/main/java/org/apache/myfaces/dateformat/SimpleDateFormatter.java > > > > > > > > > Thu Dec 20 05:45:06 2007 > > > > > > > > > > @@ -838,7 +838,7 @@ > > > > > > > > > > > > > > > > > > > > private static void formatPattern(DateFormatSymbols > > > > symbols, > > > > > > > > > ParserContext context, String patternSub, boolean > > > > > > > > > yearIsWeekYear, > > > > > > > > > StringBuffer out) > > > > > > > > > > { > > > > > > > > > > - if ((patternSub == null) || (patternSub.isEmpty())) > > > > > > > > > > + if ((patternSub == null) || (patternSub.length() > > > > > > > > > > == 0)) > > > > > > > > > > { > > > > > > > > > > return; > > > > > > > > > > } > > > > > > > > > > @@ -1137,7 +1137,7 @@ > > > > > > > > > > > > > > > > > > > > public Date parse(String dateStr) > > > > > > > > > > { > > > > > > > > > > - if ((dateStr==null) || dateStr.isEmpty()) > > > > > > > > > > + if ((dateStr==null) || (dateStr.length() == 0)) > > > > > > > > > > return null; > > > > > > > > > > > > > > > > > > > > ParserContext context = parseOps(symbols, > > > > yearIsWeekYear, > > > > > > > > > firstDayOfWeek, ops, dateStr); > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > > > > > Matthias Wessendorf > > > > > > > > > > > > > > > > > > further stuff: > > > > > > > > > blog: http://matthiaswessendorf.wordpress.com/ > > > > > > > > > sessions: http://www.slideshare.net/mwessendorf > > > > > > > > > mail: matzew-at-apache-dot-org > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > > > > > > > > > > > > http://www.irian.at > > > > > > > > > > > > > > > > Your JSF powerhouse - > > > > > > > > JSF Consulting, Development and > > > > > > > > Courses in English and German > > > > > > > > > > > > > > > > Professional Support for Apache MyFaces > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > > > > > > > > > > Matthias Wessendorf > > > > > > > > > > > > > > further stuff: > > > > > > > blog: http://matthiaswessendorf.wordpress.com/ > > > > > > > sessions: http://www.slideshare.net/mwessendorf > > > > > > > mail: matzew-at-apache-dot-org > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > > > > > Matthias Wessendorf > > > > > > > > > > > > further stuff: > > > > > > blog: http://matthiaswessendorf.wordpress.com/ > > > > > > sessions: http://www.slideshare.net/mwessendorf > > > > > > mail: matzew-at-apache-dot-org > > > > > > > > > > > > > > > > > > > > > -- > > > > > > > > > > > > > > > http://www.irian.at > > > > > > > > > > Your JSF powerhouse - > > > > > JSF Consulting, Development and > > > > > Courses in English and German > > > > > > > > > > Professional Support for Apache MyFaces > > > > > > > > > > > > > > > > > > > > > -- > > > > Matthias Wessendorf > > > > > > > > further stuff: > > > > blog: http://matthiaswessendorf.wordpress.com/ > > > > sessions: http://www.slideshare.net/mwessendorf > > > > mail: matzew-at-apache-dot-org > > > > > > > > > > > > > -- > > > > > > > > > http://www.irian.at > > > > > > Your JSF powerhouse - > > > JSF Consulting, Development and > > > Courses in English and German > > > > > > Professional Support for Apache MyFaces > > > > > > > > > > > -- > > Matthias Wessendorf > > > > further stuff: > > blog: http://matthiaswessendorf.wordpress.com/ > > sessions: http://www.slideshare.net/mwessendorf > > mail: matzew-at-apache-dot-org > >
