I added, in the lib folder of a Netbeans (6.9.1) java-library project (lets say PRJ-A) the jar generated by another java-application project.

I also modified build.xml in PRJ-B, in order to add, in its jar, the base libs of PRJ-B itself (just as an example, at the moment, the apache-commons-codec jar):

  <!-- 
  
  20110210
  Enrico was here start
  In order to pack the jars in a single jar
  I inserted this ant task
  
  for more details:
  
  http://www.java-forums.org/netbeans/12582-netbeans-creating-jar-including-jar-libraries.html
  
  
  -->
  <target name="-post-jar">
    <jar jarfile="dist/xml2BaseLibs-full-1.0.jar">
      <zipfileset src="${dist.jar}" excludes="META-INF/*" />
      <zipfileset src="lib/apache-commons/commons-codec-1.3.jar" excludes="META-INF/*" />
      <zipfileset src="lib/apache-commons/commons-beanutils.jar" excludes="META-INF/*" />
      <manifest>
        <attribute name="Main-Class" value="org.xml2sqr.xml2BaseLibs.ver1_0.Main"/>
      </manifest>
    </jar>
    <copy file="dist/xml2BaseLibs-full-1.0.jar" tofile="dist/xml2BaseLibs.jar" overwrite="true"/>
  </target>    
  <!-- 
  
  20110210
  Enrico was here end
  -->

With my surprise, the lib element of the included project (PRJ-B) seems not correctly referred inside the main project (PRJ-A): 
syntax highlight gives an error and no autocompletion of any kind (import, methods, properties...) is available on the apache-commons-codecs classes.
But I am even more surprised by the fact that I am able to compile and run from command line (not debug) the project (no compiler errors, neither runtime ones): it seems commons is there and works, using the direct call

java -jar "[someBaseFolders]/NetBeansProjects/PRJ-A/dist/PRJ-A.jar"

At the moment I'm making a workaround for this (I directly include the generated jar, eventually copying it in the PRJ-A, still using an ant task), in order to make the editor work, but I'd rather prefer the project inclusion.

thanks for any help
Enrico