Error

org.apache.jasper.JasperException: Attempted a bean operation on a null object.
	at org.apache.jasper.runtime.JspRuntimeLibrary.handleGetProperty(JspRuntimeLibrary.java:601)
	at org.apache.jsp.include.commentForm_jsp._jspx_meth_logic_present_0(commentForm_jsp.java:410)
	at org.apache.jsp.include.commentForm_jsp._jspService(commentForm_jsp.java:183)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:672)
	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:574)
	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:499)
	at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
	at org.apache.jsp.release.comments_jsp._jspService(comments_jsp.java:324)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:199)
	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:282)
	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:754)
	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:684)
	at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:876)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	at java.lang.Thread.run(Thread.java:595)

-- listing properties --
java.runtime.name=Java(TM) 2 Runtime Environment, Stand...
sun.boot.library.path=/usr/local/diablo-jdk1.5.0/jre/lib/i386
java.vm.version=diablo-1.5.0_07-b00
shared.loader=${catalina.base}/shared/classes,${cat...
java.vm.vendor=Sun Microsystems Inc.
java.vendor.url=http://java.sun.com/
path.separator=:
java.vm.name=Java HotSpot(TM) Server VM
tomcat.util.buf.StringCache.byte.enabled=true
file.encoding.pkg=sun.io
sun.os.patch.level=unknown
java.vm.specification.name=Java Virtual Machine Specification
user.dir=/home/renaud
org.xml.sax.driver=org.apache.xerces.parsers.SAXParser
java.runtime.version=diablo-1.5.0-b00
java.awt.graphicsenv=sun.awt.X11GraphicsEnvironment
java.endorsed.dirs=
os.arch=i386
java.io.tmpdir=/usr/local/apache-tomcat-5.5.17/work/...
line.separator=

java.vm.specification.vendor=Sun Microsystems Inc.
java.naming.factory.url.pkgs=org.apache.naming
os.name=FreeBSD
sun.jnu.encoding=ISO8859-1
java.library.path=/usr/local/diablo-jdk1.5.0/jre/lib/i3...
java.specification.name=Java Platform API Specification
java.class.version=49.0
sun.management.compiler=HotSpot Server Compiler
os.version=6.1-RELEASE
user.home=/usr/local/tomcat
user.timezone=America/Los_Angeles
catalina.useNaming=true
java.awt.printerjob=sun.print.PSPrinterJob
file.encoding=ISO8859-1
java.specification.version=1.5
catalina.home=/usr/local/tomcat5.5
user.name=tomcat
java.class.path=/usr/local/tomcat5.5/bin/bootstrap.ja...
java.naming.factory.initial=org.apache.naming.java.javaURLContext...
package.definition=sun.,java.,org.apache.catalina.,org.a...
java.vm.specification.version=1.0
sun.arch.data.model=32
java.home=/usr/local/diablo-jdk1.5.0/jre
java.specification.vendor=Sun Microsystems Inc.
user.language=en
java.vm.info=mixed mode
java.version=1.5.0
java.ext.dirs=/usr/local/diablo-jdk1.5.0/jre/lib/ext
sun.boot.class.path=/usr/local/diablo-jdk1.5.0/jre/lib/rt...
java.vendor=Sun Microsystems Inc.
server.loader=${catalina.home}/server/classes,${cat...
catalina.base=/usr/local/tomcat5.5
file.separator=/
java.vendor.url.bug=http://java.sun.com/cgi-bin/bugreport...
common.loader=${catalina.home}/common/classes,${cat...
sun.cpu.endian=little
sun.io.unicode.encoding=UnicodeLittle
package.access=sun.,org.apache.catalina.,org.apache....
sun.cpu.isalist=