I am having problems compiling some Scala with Maven or Eclipse where I try to import a class from a Java jar which contains both a namespace and class of the same name.
I can compile with scalac
, however.
E.g. the Java project (jar) contains:
src/foo/bar.java
src/foo/bar/some_resource.txt
-> foobar.jar
Scala project references foobar.jar
Foobartest.scala:
import foo.bar
class foobartest {
}
The compiler complains with:
package foo contains object and package with same name: bar
one of them needs to be removed from classpath
Using Maven 3.0.03/Eclipse 3.7.1 with Scala 2.9.0.1 (and maven-scala-plugin
).
The jar which I am having problems with is jenkins-core-1.399.jar
- it definitely contains several instances where there is a namespace and object of the same name.
I am attempting to write a Jenkins plugin in Scala (I could do this in Java but would prefer scala since all of our libraries are in scala), which is dependent on using Maven -
https://wiki.jenkins-ci.org/display/JENKINS/Plugin+tutorial.
That kind of limitation was outlined in SI-4695: package object misbehaves in the presence of classfiles.
As suggested in SI-2089 (naming restriction makes some jars unusable), you could try and use the "resolve-term-conflict
", as implemented in changeset 25145:
Added a
-Y
option to resolve namespace collisions between package and object.
It's a blunt instrument: if people have lots of these conflicts they need to resolve in individually nuanced fashion, they'll probably remain out of luck.
val termConflict = ChoiceSetting ("-Yresolve-term-conflict", "strategy", "Resolve term conflicts", 113 List("package", "object", "error"), "error")
// Some jars (often, obfuscated ones) include a package and
// object with the same name. Rather than render them unusable,
// offer a setting to resolve the conflict one way or the other.
// This was motivated by the desire to use YourKit probes, which
// require `yjp.jar` at runtime. See SI-2089.
The actual compiler option is "-Yresolve-term-conflict:strategy" where strategy is either package, object, error.
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