On Sat, 2005-06-11 at 19:50 -0400, Steven Caswell wrote:
Just one question about the jar:
The manifest indicates the jar was built with JDK 1.5. Does this
present any issues with running against previous Java versions?
Simon Kitching wrote:
maven.compile.target=1.2
maven.compile.source=1.2
So the .class files in the jar are useable in any 1.2 JVM, despite being
compiled via JDK 1.5. I have tested this and the jar works fine with
java 1.3.
IMHO, the compile target flag is useless, and this is a dangerous
approach. It only provides bytecode compatibility, which isn't enough.
This is because when you compile on a later JDK, it still compiles
against the Java class library of that later JDK. Many methods have been
added to key classes since 1.2 that a 1.5 compiler will choose to bind
to. When run on 1.2, the methods don't exist in the class library, so a
NoSuchMethodError (not Exception) occurs.
(eg. append(StringBuffer) in StringBuffer)
The only safe approach is to compile on the JDK you intend to be
compatible with. And, unless I've missed something, that usually can't
be done with a maven build.
Stephen
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