Java: no security manager: RMI class loader disabled

Question

Hi I have RMI application and now I try to invoke some methods at server from my client. I have following code:

public static void main(final String[] args)          


        

Answer 1

I want to add something which may be helpful for some people, especially begginers. I came here and searched for a solution for the above error, but being a beginner, I didn't know how to use security policies and specify the "java.rmi.server.codebase" attribute. The simplest way to fix that error is to make sure that the classes of the objects to be sent over RMI are in the same path of packages.. In this way, both applications have the class in the same location relative to their main folder and the error will solve.

Example: If you want to send an object of type MedicationDTO (which is serializable) from server to client, make sure that it is in the same package path. In my case, in the server app, the object was in com.example.springdemo.dto and in the client app, it was in com.example.springdemo.service.dto.. The problem was that, using IntelliJ, because the service package had nothing in it, but an other package, their name was concatenated (service.dto) and I could not see that the path was not the same. So, make sure that your classes have the same package path. (Solution for my case: MedicationDTO class has to be in both application in package: com.example.springdemo.dto.

I know this is not the best solution, it's just a 'little trick', but I would have been extremely happy to find this solution then, because it had saved me from a lot of wasted time to solve the problem.

I hope this will be helpful for those who want a quick fix to that error, because I think learning to use security managers and including codebase could be a little tricky and will take time.