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Urgent help regarding Reflection

4 replies on 1 page. Most recent reply: Apr 12, 2002 12:59 PM by Matt Gerrans

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Mohit Gupta

Posts: 15
Nickname: mohit
Registered: Mar, 2002

Urgent help regarding Reflection Posted: Apr 12, 2002 4:46 AM
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is there any way to access package accissible field of any class through reflection, and then can we change value assingned to it??


Matt Gerrans

Posts: 1153
Nickname: matt
Registered: Feb, 2002

Re: Urgent help regarding Reflection Posted: Apr 12, 2002 10:14 AM
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I haven't tried this, but I think you need to set up the security policy with java.lang.reflect.ReflectPermission.

Matt Gerrans

Posts: 1153
Nickname: matt
Registered: Feb, 2002

Re: Urgent help regarding Reflection Posted: Apr 12, 2002 10:17 AM
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More specifically, try a policy file with this content:
grant {
  permission java.lang.reflect.ReflectPermission "suppressAccessChecks";
};

Mohit Gupta

Posts: 15
Nickname: mohit
Registered: Mar, 2002

Re: Urgent help regarding Reflection Posted: Apr 12, 2002 11:01 AM
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Thanx for ur quick reply Mr. Matt, i haven't tried ur suggestion till now but will try it, but besides it i have resolved my problem by using code :

got the reqdField by getDeclaredFields(), and then make its accessibility status true by :

reqdField.setAccessible(true);

and change its value to desired one..and it turned into desired result.

Matt Gerrans

Posts: 1153
Nickname: matt
Registered: Feb, 2002

Re: Urgent help regarding Reflection Posted: Apr 12, 2002 12:59 PM
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Sounds like your security policy was already loose enough, because this is what the documentation says:

If there is a security manager, this method first calls the security manager's checkMemberAccess method with this and Member.DECLARED as its arguments. If the class is in a package, then this method also calls the security manager's checkPackageAccess method with the package name as its argument. Either of these calls could result in a SecurityException.

If you are working outside the package in question and you didn't get a SecurityException, then your policy is already permissive enough. Maybe you were already using policy.all:
grant {
    permission java.security.AllPermission "", "";
};

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