Tomcat 4.1.18 + Apache 1.3.22 (mod_jk): SEVERE: Error in action code

[Marco Bucciarelli <mb...@edp-progetti.it>]

I am working on RedHat Linux 7.0, Sun JDK 1.4.1_01, Apache 1.3.22 and Tomcat 4.1.18 connected together using mod_jk (Thanks to John Turner's howtos). I did not compile the jk module, but I got an RPM of the 1.2.2 version.
Everything seems to work fine, but if I see at catalina.out I get this error message every time I ask a JSP. The output, dispite the error, is served correctly and with no particular slowness.
What is the problem?

SEVERE: Error in action code 
java.lang.NullPointerException
 at org.apache.jk.server.JkCoyoteHandler.action(JkCoyoteHandler.java:386)
 at org.apache.coyote.Response.action(Response.java:222)
 at org.apache.coyote.tomcat4.CoyoteAdapter.postParseRequest(CoyoteAdapter.java:310)
 at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:221)
 at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:261)
 at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:360)
 at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:604)
 at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:562)
 at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:679)
 at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:530)
 at java.lang.Thread.run(Thread.java:536) 

Thanks,
Marco.