Tomcat starts, but when I try to access eHelpdesk I get a 404 error and the Tomcat log have a statement to the following effect:

The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /usr/lib/jvm/java-1_6_0-ibm-1.6.0/jre/lib/i386:/usr/lib

This error states that the application is using the IBM version of Java that comes bundled with many distributions of Linux

In some configurations, in addition to the JAVA_HOME=<jdk installation directory>, your must also specify an additional environment variable of JRE_HOME=<jdk installation directory>