the jar zipfile has 0 byte files named for each directory preventing successful unzipping (WTF!)

Jim,
Thanks for the report.

Mauro,
I verified what Jim was talking about. Pico-2 release has those weird entries, Pico2 snapshot located here:

http://snapshots.repository.codehaus.org/org/picocontainer/picocontainer/2.0-SNAPSHOT/

does not appear to suffer the same problem. But my own local Pico2.1-SNAPSHOT builds (via mvn clean install) do have the same problem.

Is is possible that one of the plugins we're using to make this build is causing this issue?

-Mike (R)

As Joerg pointed out it could be due to plugins whose version has not been fixed. Will need to investigate.

Problem seems to be with the maven-jar-plugin. Version 2.0 works fine, but 2.1 and 2.2 seem to suffer the problem. To reproduce, build jar by mvn install and then

jar xvf picocontainer-[version].jar

Using version 2.1+ of plugin yields error:

inflated: META-INF
java.io.IOException: META-INF : could not create directory
at sun.tools.jar.Main.extractFile(Main.java:730)
at sun.tools.jar.Main.extract(Main.java:691)
at sun.tools.jar.Main.run(Main.java:190)
at sun.tools.jar.Main.main(Main.java:925)

Oddly though the simply list seems to work

jar tvf picocontainer-[version].jar

Workaround for the moment is to fix maven-jar-plugin version at 2.0, ie adding

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.0</version>
</plugin>

in the <pluginManagement> section of https://svn.codehaus.org/picocontainer/java/2.x/trunk/pico/pom.xml

Have also a look at MSHADE-15.

I'm having this problem as well, but I was able to work around it by using the 'original-picocontainer-2.0.jar' generated by the build.

(WTF!)

Indeed. The jars on the download part of the picocontainer don't work right now. That's not good.

I just tried adding

<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.0</version>
</plugin>

to pom.xml.

It didn't generate a readable JAR. Note that this unreadable jar doesn't work in IDEA, so that's not good.

Latest Shade Plugin seems to generate correct Jars.

Should be fixed since 2.2 release.