Recently, my Tomcat 6 Development system decided not to start up anymore, but to throw this ugly exception instead:
03.10.2007 14:29:12 org.apache.tomcat.util.modeler.Registry registerComponent
SCHWERWIEGEND: Error registering Catalina:j2eeType=WebModule,name=//localhost/MACHacmsg,J2EEApplication=none,J2EEServer=none
java.security.AccessControlException: access denied (javax.management.MBeanTrustPermission register)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:568)
[...]
No idea why, but i fixed it by adding the following line in the “grant” section of JRE’s lib/security/java.policy file:
permission javax.management.MBeanTrustPermission "register";