Embedding NodeFilter in jar: NoClassDefFoundE

[Gerhard Olsson]

I try to use htmlparser embedded in a jar (without main()), that is loaded by another jar. However, if I include any class derived from NodeFilter, the main program cannot load the jar unless I decomment all NodeFilter related calls. (not much left)

The only I can interpret from the message is that NodeFilter requires a main class since it is an interface, but that seems odd.

Any hints?

Gerhard

(I try to use htmlparser in the searchengine regain.sf.net. I am not the author, but will try to get the author accept a real parser.)

        at net.sf.regain.crawler.document.DocumentFactory.<init>(Unknown Source)
        at net.sf.regain.crawler.IndexWriterManager.<init>(Unknown Source)
        at net.sf.regain.crawler.Crawler.run(Unknown Source)
        at net.sf.regain.crawler.Main.main(Unknown Source)
Caused by: net.sf.regain.RegainException: Loading preparator file 'preparator/Ht
mlPreparator.jar' failed
        at net.sf.regain.crawler.document.PreparatorFactory.loadPrepararorJar(Un
known Source)
        at net.sf.regain.crawler.document.PreparatorFactory.createPreparatorArr(
Unknown Source)
        ... 4 more
Caused by: java.lang.NoClassDefFoundError: org/htmlparser/NodeFilter
        at java.lang.Class.getDeclaredConstructors0(Native Method)
        at java.lang.Class.privateGetDeclaredConstructors(Class.java:2328)
        at java.lang.Class.getConstructor0(Class.java:2640)
        at java.lang.Class.newInstance0(Class.java:321)
        at java.lang.Class.newInstance(Class.java:303)
        at net.sf.regain.RegainToolkit.createClassInstance(Unknown Source)
        ... 6 more

[Gerhard Olsson]

The best way to find your own stupid problems are to post them in public.

I had not updated the ant buildfile properly, so the libraries were not included in the jar. For some reason I did not get the same message for other included jars.

      <fileset dir="temp/included-lib-classes/common">                         
        <include name="org/htmlparser/**"/>                                    
      </fileset>