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anti-pattern : there must be at least two key elements present to formally distinguish an actual anti-pattern from a simple bad habit, bad practice, or bad idea:
Some repeated pattern of action, process or structure that initially appears to be beneficial, but ultimately produces more bad consequences than beneficial results, and
A refactored solution that is clearly documented, proven in act...
So after a few hours of workaround the limitation of Reflection being currently disabled on the Google App Engine, I was wondering if someone could help me understand why object reflection can be a threat. Is it because I can inspect the private variables of a class or are there any other deeper reasons?
There are different opinions on the meaningfulness of testing of private methods, e.g., here and here. I personally think it makes sense, the question is how to do it properly.
In C++ you can use a #define hack or make the test class friend, in C# there's the InternalsVisibleToAttribute, but in Java we either have to use reflection or to make them "visible for testing" and annotate them as such...
This is a question I was asked in an interview: I have class A with private members and Class B extends A. I know private members of a class cannot be accessed, but the question is: I need to access private members of class A from class B, rather than create variables with the same value in class B.
I hope I am clear with this question.
Thanks.
I have the code of a simple game, where an AgentInterface must be implemented in order to create an agent controller for one of the characters in the game. GameState is a class the implements GameStateInterface, and an object that implements this interface can be passed to the agent, so the agent can read and analyze the data from game state, and the agent must return the appropriate action (re...
As you know, Spring can inject values to private instance variables, and Hibernate can access private variables of persistent classes. However, I can't even call protected methods of a class through reflection! How can Spring and Hibernate blatantly breach security like that? And more importantly, how do I do it? :D
I came across an example of @Autowired
public class EmpManager {
@Autowired
private EmpDao empDao;
}
I was curious about how the empDao get sets since there are no setter methods and it is private.
I saw this question
http://stackoverflow.com/questions/2021716/inject-into-private-package-or-public-field-or-provide-a-setter
about how to manually inject into annotated private fields (The way is adding setters
or through a constructor)
But, the point is how do an application server (like glassfish, axis2, jboss, ...)
is able to inject into a final private field (without adding setters or ...
this was an interview question posed to me..I vaguely answered it uses Java reflections..but I was not sure. how does that work?
In Java, when a SecurityManager exists that rejects access check suppression, Constructor's newInstance method works while Class's newInstance throws a SecurityException. Here's an example:
import java.lang.reflect.ReflectPermission;
import java.security.Permission;
public class Test {
public static void main(String[] args) throws Exception {
System.setSecurityManager(new Security...
I have a situation where a user's code is throwing an IllegalAccessException on a field accessed by reflection. Just before accessing the field, setAccessible(true) is called. So, it would seem to me that this method is silently failing.
Under what situations would this happen? Could this have something to do with a security manager?
Here is the code snippet that is causing the exception:...
I have a question about reflection
I am trying to have some kind of eval() method. So i can call for example:
eval("test('woohoo')");
Now I understand the there is no eval method in java but there is reflection. I made the following code:
String s = "test";
Class cl = Class.forName("Main");
Method method = cl.getMethod(s, String.class);
method.invoke(null, "woohoo");
This works perfectly...
public class MyClass {
ClassABC abc = new ClassABC();
}
I just have a .class file of ClassABC. I want to print all the public, private, protected and default field values of "abc" object. How can I do this using Reflection?
how can i set a field in a class that it's name is dynamic and stored in a string variable ?
public class test {
public String a1;
public string a2;
public test(String key) {
this.key='found'; <--- error
}
}
Let's say we have a class foo which has a private instance variable bar.
Now let us have another class, baz, which extends foo. Can non-static methods in baz access foo's variable bar if there is no accessor method defined in foo?
I'm working in Java, by the way.
I was trying to fetch the value of an static private attribute via reflection, but it fails with an error.
Class class = home.Student.class;
Field field = studentClass.getDeclaredField("nstance");
Object obj = field.get(null);
The exception i get is something like this.
java.lang.IllegalAccessException: Class com.test.ReflectionTest can not access a member of class home.Student with modifie...
Something like this:
class C {
typeof(this) foo() { return this; }
}
Well, I know it's impossible in Java 6, so I'll be glad to hear if I can do it in Java 7.
EDIT
This should be useful for chaining method calls, and avoid to create temporary local variables, like this:
class Entity {
typeof(this) refresh();
typeof(this) clone();
typeof(this) detach();
}
class FooEn...
Possible Duplicate:
How to convert a Java object (bean) to key-value pairs (and vice versa)?
What is the best way to convert a List<POJO> to a List<Map<K,V>>.
Is there a custom method/ API?
K = field name of the POJO and V is the corresponding value
public class POJO implements Serializable{
String name;
String age;
//getters and setters
}
Via reflection I have found a lists of properties from x POJO classes which I need to display and also created a list of headings for which I will display the properties under(headings are from annotations on the fields).
The form of the POJO is that for each property I wish to display there is a getter.
Here are the details: The POJO's are annotated with @Entity, I am executing a query (...
HTTPUrlConnection.setContentHandlerFactory()method throws Exception saying factory is already defined. I understand that. Is it possible to unset the factory and change the contenthandler factory?
Greetings,
I understand that this is not the best forum for getting legal advices. But I am still wondering if anybody has some experience around this topic, or can point me to relevant resources that explain it. I have tried to search it online but could not find clear answers.
Assuming I am using a Java open-source library from "somecompany", specifically its entities in the "org.somecompan...
