Description of problem:
1. When using cmd "tomcat-digest" in order to create a SHA hash of tomcat passwords,the cmd fails with below java exception.
~~~
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/tomcat/util/ExceptionUtils
        at org.apache.catalina.startup.Tool.main(Tool.java:230)
Caused by: java.lang.ClassNotFoundException: org.apache.tomcat.util.ExceptionUtils
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        ... 1 more
~~~

Version-Release number of selected component (if applicable):
~~~
Server version: Apache Tomcat/7.0.54
Server built:   Mar 24 2015 07:49:05
Server number:  7.0.54.0
OS Name:        Linux
OS Version:     3.10.0-229.el7.x86_64
Architecture:   amd64
~~~
How reproducible:
1. [pankaj@dhcp Desktop]tomcat-digest  (Use simple cmd with no parameter)

Actual results:
~~~
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/tomcat/util/ExceptionUtils
        at org.apache.catalina.startup.Tool.main(Tool.java:230)
Caused by: java.lang.ClassNotFoundException: org.apache.tomcat.util.ExceptionUtils
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        ... 1 more
~~~

Expected results:
~~~
[pankaj@dhcp Desktop]$ tomcat-digest -a SHA-256 Foo
Foo:1cbec737f863e4922cee63cc2ebbfaafcd1cff8b790d8cfd2e6a5d550b648afa
~~~

Additional info:

- It can be seen that the cause of error is due to the class "org.apache.tomcat.util.ExceptionUtils" is not available for the class loader during this early stage.The class "org.apache.tomcat.util.ExceptionUtils" is located in "/usr/share/tomcat/lib/tomcat-coyote.jar" 

~~~~~~~~~
[pankaj@dhcp233-125 lib]egrep -ir "org.apache.tomcat.util.ExceptionUtils"  /usr/share/tomcat/lib/
O/P : Binary file /usr/share/tomcat/lib/tomcat-coyote.jar matches
~~~~~~~~~

- We also need to add "/usr/share/tomcat/lib/tomcat-util.jar" to classpath or else the cmd will throw the error something like :

~~~
java.lang.NoClassDefFoundError: org/apache/tomcat/util/res/StringManager
	at org.apache.catalina.util.LifecycleBase.<clinit>(LifecycleBase.java:39)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.apache.catalina.startup.Tool.main(Tool.java:228)
Caused by: java.lang.ClassNotFoundException: org.apache.tomcat.util.res.StringManager
~~~

Workaround : 

- The simple workaround is just add the jar's "tomcat-util.jar" and "tomcat-coyote.jar" to his classpath.

eg :  # CLASSPATH=/usr/share/tomcat/lib/tomcat-util.jar:/usr/share/tomcat/lib/tomcat-coyote.jar tomcat-digest -a md5 mycredentials

- The result would be it includes the missing .jar files needed by tomcat-digest.After adding these jar's the script works as expected.