exception thrown: java.lang.UnsupportedOperationException java.lang.UnsupportedOperationException

`java.lang.UnsupportedOperationException` 是Java中的一个运行时异常（RuntimeException），它属于`java.lang`包中的`UnsupportedOperationException`类。这个异常通常被用于表示对象不支持用户请求的操作。

在Java的集合框架中，某些接口或者类中的方法声明了某些操作，但这些操作实际上是不被支持的。例如，`java.util.Collections`类中的`unmodifiableList`方法返回一个不可修改的列表，如果你尝试对该列表进行添加或删除元素的操作，就会抛出`UnsupportedOperationException`异常。这提醒使用者，他们正在操作的是一个不支持修改的集合。

在自定义的类中，如果你不希望某个方法被调用，也可以通过在该方法中抛出`UnsupportedOperationException`异常来表示这一点。这通常用于标记某个方法为"只读"或"未实现"。

异常的具体使用场景有：
1. 使用Java集合框架中的只读集合时，如果尝试修改集合内容，则会抛出此异常。
2. 在自定义类中实现某些接口时，如果某个方法不打算支持，可以在该方法体中抛出此异常。
3. 在接口中声明某些默认不支持的方法，具体实现类可以抛出此异常来明确表示该方法不支持。

相关问题

Caused by: java.lang.IllegalArgumentException

Caused by: java.lang.IllegalArgumentException is a common exception in Java programming language. It is thrown when an illegal argument is passed to a method or constructor. This means that the value provided as an argument is invalid or inappropriate for the given context.

To fix this issue, you need to carefully review the code and identify where the illegal argument is being passed. Then, you can modify the code to provide a valid argument or handle the situation appropriately.

If you can provide more specific details or code snippets, I can help you further in resolving this exception.

java: java.lang.reflect.InvocationTargetException

java.lang.reflect.InvocationTargetException is a checked exception that occurs when a method is invoked with reflection, but the method itself throws an exception.

In other words, if a method invoked via reflection throws an exception, the exception is wrapped in an InvocationTargetException and thrown to the caller. This exception typically occurs when the invoked method throws a checked exception that is not declared in the method signature.

For example, consider the following code:

public class MyClass {
  public void myMethod() throws IOException {
    // some code that may throw an IOException
  }
}

// ...

try {
  MyClass myObj = new MyClass();
  Method myMethod = MyClass.class.getMethod("myMethod");
  myMethod.invoke(myObj);
} catch (InvocationTargetException e) {
  // handle the wrapped exception here
  System.out.println("Exception occurred: " + e.getCause());
}

If myMethod throws an IOException, it will be wrapped in an InvocationTargetException and thrown to the caller. The catch block can then extract the wrapped exception using the getCause() method and handle it appropriately.