I'm running Tomcat 6.0.29 and created a realm and loginmodule of my own. They are defined in server.xml like so:
<Realm className="mycompany.tomcat.MyRepositoryRealm"
appName="My_Realm"
userClassNames="mycompany.tomcat.IdentityPrincipal"
roleClassNames="mycompany.tomcat.RolePrincipal"
useContextClassLoader="true"/>
I have added the library containing these classes to my tomcat/lib folder. Other than that, I have not changed Tomcat from it's default configuration.
When I go to fire up the Tomcat manager application at http://localhost:9080/manager/html, I can't log in and the tomcat log shows an error and stacktrace for my login module.
Any ideas? Thanks!
Edit:
Per request, here is the stacktrace. My realm connects to a JBoss service, so that's why I get the NamingContextFactory error.
javax.security.auth.login.LoginException: Cannot instantiate class: org.jnp.interfaces.NamingContextFactory
at mycompany.tomcat.MyRepositoryLoginModule.login(MyRepositoryLoginModule.java:88)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at javax.security.auth.login.LoginContext.invoke(LoginContext.java:769)
at javax.security.auth.login.LoginContext.access$000(LoginContext.java:186)
at javax.security.auth.login.LoginContext$4.run(LoginContext.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:680)
at javax.security.auth.login.LoginContext.login(LoginContext.java:579)
at org.apache.catalina.realm.JAASRealm.authenticate(JAASRealm.java:410)
at org.apache.catalina.realm.JAASRealm.authenticate(JAASRealm.java:335)
at mycompany.tomcat.MyRepositoryRealm.authenticate(MyRepositoryRealm.java:34)
at org.apache.catalina.authenticator.BasicAuthenticator.authenticate(BasicAuthenticator.java:181)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:528)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:619)
I was able to figure out the problem.
Security realms can be defined for an engine, host, or context. I had defined the realm for the whole host (in server.xml), so the tomcat manager application was trying to use it. I fixed the problem by defining the realm in a META-INF/context.xml file inside of my web application.
来源：https://stackoverflow.com/questions/3859160/why-is-tomcat-manager-using-my-loginmodule