I'm using the standard implementation of Realm. Here's the code
//Validate passwords
try {
if (oldTomcatPassword != null &&
!"".equals(oldTomcatPassword.trim()))
{
TomcatConfig tconf = TomcatConfig.getInstance();
String digestAlg =
tconf.getTomcatPwdEncryptionType();
String encryptedOldPwd = oldTomcatPassword;
if (digestAlg != null)
encryptedOldPwd =
RealmBase.Digest(oldTomcatPassword, digestAlg);
if
(!encryptedOldPwd.equals(tconf.getEncryptedTomcatPwd(tomcatUserName))) {
errors.add("incorrectPwd", new
ActionError("error.password.incorrect"));
}
}
As I said, it no longer compiles with catalina.jar from Tomcat 7.0.41. This is
not a surprise, that the signature would change, and I changed the code
accordingly. Now it is:
encryptedOldPwd = RealmBase.Digest(oldTomcatPassword, digestAlg, encodedType);
Compiles fine now.
. However, when I build with ant, it says actual and formal argument lists
differ in length. I don't know why there's an actual and a formal argument
list. I swapped out catalina.jar.
188: error: method Digest in class RealmBase cannot be applied to given types;
[javac] encryptedOldPwd =
RealmBase.Digest(oldTomcatPassword, digestAlg, encodedType );
[javac] ^
[javac] required: String,String
[javac] found: String,String,String
[javac] reason: actual and formal argument lists differ in length
[javac] 2 errors
[javac] 1 warning
-----Original Message-----
From: Caldarale, Charles R [mailto:chuck.caldar...@unisys.com]
Sent: Thursday, June 13, 2013 1:41 PM
To: Tomcat Users List
Subject: RE: Class cast exception when starting tomcat 7.0.1
> From: Jane Muse [mailto:jm...@rocketsoftware.com]
> Subject: RE: Class cast exception when starting tomcat 7.0.1
> I had catalina.jar in WEB-INF/lib.
Very, very bad move.
> It's needed because we have an implementation of Realm to store an
> encrypted tomcat password users enter in the webapp.
Your custom implementation of Realm should be in Tomcat's lib directory, not
the webapp's. See:
http://tomcat.apache.org/tomcat-7.0-doc/realm-howto.html#What_is_a_Realm?
Such a Realm should not be tied into the operation of any webapp, other than
configuring the webapp to use it.
> If I remove it and add the catalina.jar from tomcat_home/lib to the
> classpath
Not sure what you mean by adding it to the classpath; please explain.
> I have to change the signature from
> org.apache.catalina.realm.RealmBase.Digest(String, String) to
> org.apache.catalina.realm.RealmBase.Digest(String, String, String).
That's because internal Tomcat APIs often change between levels. You certainly
cannot count on using an older version of Realm with a newer Tomcat (or vice
versa).
> Should I not be writing code that needs classes from catalina.jar?
It would certainly be desirable not to be dependent on internal Tomcat classes.
Why do you think a Realm should be storing a password (encrypted or not)
anywhere? A Realm would normally be reading a password from some controlled
storage, not writing to it.
- Chuck
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