How set policy.provider to be your class?

Question

I have made a class EJBPolicy that extends java.security.Policy (i'm using jdk1.4), and overrides the abstract methods. Then in my java.home folder, I changed the file "java.security" so the property "policy.provider" now reads "EJBPolicy". I also changed the "java.security" file in my installation folder (just to be sure). I do not have that file in "user.home". I also added the EJBPolicy to the classpath (added both the folder it is in, as well as the file itself). Then I ran my application like this:
java -classpath D:\JAAS;D:\JAAS\M -Djava.security.manager -Djava.security.auth.login.config=jaas.conf -Djava.security.policy=jaasazn.policy JaasAzn
The "jaasazn.policy" file gives me the ability to get/set the Policy. I added a method to my policy class called getName(), which returns "EJBPolicy". However, when I do this in my app:
System.out.println(((EJBPolicy)thePolicy).getName());
it results in the error:
java.lang.ClassCastException: sun.security.provider.PolicyFile
If I call Policy.setPolicy() and set it to my class EJBPolicy, then it works. But I thought I was able to make my class the default polciy class. What am I doing wrong?

Answer 1

Hello,
at first you should save your origninal rt.jar in jre\lib\.....
You have two way to use you own class:
way a.)
you can create you own jar-file
for a example, my class-files are in e:\....\classes\com\myfile\security :
jar cf myrt.jar com\myfile\security\*.class <-- the new jar file is myrt.jar
I use JBUILDER4-Foundation , in his VM-Option I use the parameter:
-Xbootclasspath:E:\JBuilder4\myproject\MyTest\Classes\myrt.jar;E:\JBuilder4\jdk1.3\jre\lib\rt.jar
This means, myrt.jar will load at first, then the rt.jar
Jbuilder4 call it so:
E:\JBuilder4\jdk1.3\bin\javaw -classpath "E:\JBuilder4\myproject\MyTest\classes;E:\JBuilder4\jdk1.3\demo\jfc\Java2D\Java2Demo.jar;E:\JBuilder4\jdk1.3\jre\lib\i18n.jar;E:\JBuilder4\jdk1.3\jre\lib\jaws.jar;E:\JBuilder4\jdk1.3\jre\lib\rt.jar;E:\JBuilder4\jdk1.3\jre\lib\sunrsasign.jar;E:\JBuilder4\jdk1.3\lib\dt.jar;E:\JBuilder4\jdk1.3\lib\tools.jar" -Xbootclasspath:E:\JBuilder4\myproject\MyTest\Classes\myrt.jar;E:\JBuilder4\jdk1.3\jre\lib\rt.jar mytest.App
way b.)
if you want to insert your class file in the big rt.jar-file:
jar uf rt.jar com\myfile\security\*.class
so, then you don't need the VM-Option -Xbootclasspath .
If you want to check which Policy-class is loaded:
System.out.println("Es wird folgende Policy classe verwendet");//which policy class is used ?
System.out.println(Policy.getPolicy());// print the policy class
System.out.println("ende der Policy classe info"); // end of policy info
Here is a example of my java.security-file:
#policy.provider=sun.security.provider.PolicyFile
policy.provider=com.myfile.security.MyPolicyFile
# this is my own policy-class
I hope, I could help you,
greetings, jens
[email protected]