If a library A that you call, calls a method "mailme" in library B ,
you can not remove that library unless you are supplying a later version
of the library B with the "mailme" method through another dependency. If
"mailme" was deprecated and removed in the later version of B, you will
not be able to use the latest version and will be forced to use the
version that library A depends on.
If you have a direct dependency on javax.mail:mail:jar:1.4:compile in
your pom, it would be a good idea to exclude that library in other
dependencies so that you get the version that you want.
This does make you responsible for ensuring that the version that you
specify is high enough to satisfy the needs of the other libraries that
you use.
If you specify version 1.3 and you have a dependency that requires 1.4,
you may get run-time problem such as MethodNotFound or bugs showing up
that were fixed in 1.4.
If you do not do the exclude, Maven will sort it out in a logical way
which will get you highest version required.
If the version of Xerces that ships with the JDK that you are using is
high enough to satisfy the dependencies that your dependency tree needs,
then Maven will find it and use it.
The easiest way to determine if you have a setup that will execute is to
test it.
Looking at the Maven dependency hierarchy will save a bit of time but
depends on your attention to detail.
Ron
On 07/01/2013 4:51 AM, adrien ruffie wrote:
I also have another question.
In my application I have the following dependency:
org.apache.geronimo.specs:geronimo-javamail_1.4_spec:jar:1.2:compile pulled
by org.apache.axis2:addressing:mar:1.5.1:compile
javax.mail:mail:jar:1.4:compile also pulled by axis2:addressing:
+- org.apache.axis2:addressing:mar:1.5.1:compile
[INFO] | +- org.apache.ws.commons.axiom:axiom-api:jar:1.2.8:compile
[INFO] | | +-
org.apache.geronimo.specs:geronimo-activation_1.1_spec:jar:1.0.1:compile
[INFO] | | +-
org.apache.geronimo.specs:geronimo-javamail_1.4_spec:jar:1.2:compile
[INFO] | | \- jaxen:jaxen:jar:1.1.1:compile
[INFO] | +- org.apache.ws.commons.axiom:axiom-impl:jar:1.2.8:compile
[INFO] | +- org.apache.ws.commons.axiom:axiom-dom:jar:1.2.8:compile
[INFO] | +- javax.mail:mail:jar:1.4:compile
[INFO] | +- xalan:xalan:jar:2.7.0:compile
and com.sun.mail:javax.mail:jar:1.4.4:compile pulled by another dependency I
my application.
Can't I exclude 2 of these 3 dependencies ... and which of them ?
xerces:xercesImpl:jar:2.8.1:compile pulled by
net.sourceforge.nekohtml:nekohtml:jar:1.9.7:compile
In fact that xeces is already embedded into java 6 can I exclude 2.8.1 ?
because my last exclude was xercesImpl 2.7.1 and
I have javax.mail:mail:jar:1.4:compile pull
And how can I be sure that there will be no problem in execution due to
exclusions?
--
Ron Wheeler
President
Artifact Software Inc
email: [email protected]
skype: ronaldmwheeler
phone: 866-970-2435, ext 102
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