Help, could not read properties after setting the RMISecurityManager.

Question

Hi,
I am new in RMi and I could not read a properties file when run a class in jar file with java -jar option.
I start the the class by as follows.
java -jar darwin_enhanced.jar -Djava.rmi.server.codebase=file:///home/wing/Darwin/Project/release.server/DarwinServer.jar -Djava.security.policy=darwin.server.policy
I extract the following code snipplet from the main class.
/* get security manager */     
if (System.getSecurityManager() == null) {
System.setSecurityManager(new RMISecurityManager());
/* get properties */     
Properties properties = new Properties();
try
System.out.println("before happy");
properties.load(getClass().
getResourceAsStream("/darwinServer.properties"));
System.out.println("after happy");
}catch (Exception e)
e.printStackTrace();
If the System.setSecurityManager(new RMISecurityManager()) is called before the properties.load method, the pgm prints out
'before happy' and dumps
java.lang.NullPointerException
at java.io.Reader.<init>(Reader.java:61)
at java.io.InputStreamReader.<init>(InputStreamReader.java:80)
at java.util.Properties.load(Properties.java:189)
at com.darwin.server.DarwinServer.startBind(DarwinServer.java:61)
at com.darwin.server.DarwinServer.main(DarwinServer.java:48)
If I reverse the order, call properties.load mehod before setting the RmiSecurityMananger,
/* get properties */     
Properties properties = new Properties();
try
System.out.println("before happy");
properties.load(getClass().
getResourceAsStream("/darwinServer.properties"));
System.out.println("after happy");
}catch (Exception e)
e.printStackTrace();
/* get security manager */     
if (System.getSecurityManager() == null) {
System.setSecurityManager(new RMISecurityManager());
it works fine and print out
'before happy'
'after happy'
Thanks,
Wing

Answer 1

Hi,
Thanks for your ideas.
My primary object is to let the server reads propertiy files. I found that I have to set the RMISecurityManager, otherwise, the rebind will throws
java.rmi.UnmarshalException.
I have changed the testing program according to you inputs.
void startTest(){
System.out.println("CodeSource="+this.getClass().getProtectionDomain().getCodeSource());
System.out.println("Permission="+this.getClass().getProtectionDomain().getPermissions());
if(System.getSecurityManager()==null)
System.setSecurityManager(new RMISecurityManager());
Properties properties = new Properties();
try
System.out.println("CodeSource="+this.getClass().getProtectionDomain().getCodeSource());
System.out.println("Permission="+this.getClass().getProtectionDomain().getPermissions());
properties.load(RMIClassLoader.getClassLoader("file:/").getResourceAsStream("sample.properties"));     
System.out.println("size of properties = " + properties.size() );
properties.load(getClass().getResourceAsStream("/sample.properties"));
}catch(Exception e)
e.printStackTrace();
I run in jar with the following command with no exception,
java -Djava.security.policy=java.all.policy -jar simBug.jar
Output
CodeSource=(file:/home/wing/try/java/bug.sim/RMISecurityManager/simBug.jar <no certificates>)
Permission=java.security.Permissions@8d107f (
(java.lang.RuntimePermission exitVM)
(java.io.FilePermission /home/wing/try/java/bug.sim/RMISecurityManager/simBug.jar read)
CodeSource=(file:/home/wing/try/java/bug.sim/RMISecurityManager/simBug.jar <no certificates>)
Permission=java.security.Permissions@8d107f (
(java.lang.RuntimePermission exitVM)
(java.io.FilePermission /home/wing/try/java/bug.sim/RMISecurityManager/simBug.jar read)
size of properties = 1
Thanks,
Wing