Github user jinmeiliao commented on a diff in the pull request:

    https://github.com/apache/incubator-geode/pull/228#discussion_r73898764
  
    --- Diff: 
geode-core/src/main/java/org/apache/geode/security/templates/SampleSecurityManager.java
 ---
    @@ -126,26 +126,33 @@ public boolean authorize(final Principal principal, 
final ResourcePermission con
     
       @Override
       public void init(final Properties securityProperties) throws 
NotAuthorizedException {
    -    String jsonPropertyValue = 
securityProperties.getProperty(SECURITY_JSON);
    +    boolean initialized = false;
    +
    +    String jsonPropertyValue = securityProperties != null ? 
securityProperties.getProperty(SECURITY_JSON) : null;
         if (jsonPropertyValue == null) {
    -      throw new AuthenticationFailedException("SampleSecurityManager: 
property [" + SECURITY_JSON + "] must be set.");
    -    }
    +      initialized = initializeFromJsonResource(DEFAULT_JSON_FILE_NAME);
    +    } else {
     
    -    // 1st try to load value as a json resource
    -    boolean initialized = initializeFromJsonResource(jsonPropertyValue);
    +      // 1st try to load value as a json resource
    +      initialized = initializeFromJsonResource(jsonPropertyValue);
     
    -    // 2nd try to load value as a json file
    -    if (!initialized) {
    -      initialized = initializeFromJsonFile(new File(jsonPropertyValue));
    -    }
    +      // 2nd try to load value as a json file
    --- End diff --
    
    Do we really need the 2nd try and 3rd try? We don't use 
SampleSeucurityManager this way. If we can get rid these additional tries, then 
the init could be simple as this:
    
    String jsonPropertyValue = securityProperties.getProperty(SECURITY_JSON);
    if(jsonPropertyValue == null) jsonPropertyValue = DEFAULT_JSON_FILE_NAME;
    if(!initializeFromJsonResource(jsonPropertyValue)){
      // throw exception....
    }



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