I accidentally hit this page:
http://www.theserverside.com/news/thread.tss?thread_id=22481

On this page is:
J2EE complexity debated in the community
Erik Hatcher in J2MU thinks that the question needs to be unasked.
If you try J2MU you see something as familiar as disturbing:

HTTP Status 500 -

---

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.NullPointerException
java.io.File.(File.java:180)
org.apache.lucene.store.FSDirectory.getDirectory(FSDirectory.java:113)
org.apache.lucene.index.IndexReader.open(IndexReader.java:98)
org.apache.lucene.search.IndexSearcher.(IndexSearcher.java:75)
blogscene.store.lucene.LuceneStore.retrieve(LuceneStore.java:55)
blogscene.BlogSceneServer.doGet(BlogSceneServer.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0 logs.

---

Apache Tomcat/5.0

See also this page: http://www.blogscene.org/

Is anyone using it?

Yeah, Erik's blog runs it: http://www.blogscene.org/erik

Development in Java can be cumbersome.
Try java.lang.NullPointerException search in Google:
Results 1 - 10 of about 892,000 for java.lang.NullPointerException. (0.07 seconds)
and the second time:
Results 1 - 10 of about 938,000 for java.lang.NullPointerException. (0.04 seconds)
This will toggle if repeated.
As I found out all searches toggle between two values!