InvocationTargetException exception handling

InvocationTargetException exception handling steps: 1. Get the root cause of the exception through the "getCause()" method of InvocationTargetException; 2. Use the "printStackTrace()" method of InvocationTargetException to print exception information; 3. You can use try -catch statement to capture root cause exceptions; 4. Distinguish between business exceptions and system exceptions.

InvocationTargetException is an exception type in Java. It usually occurs when a method is called reflectively. The called method throws an exception but is not caught. This exception will be wrapped into InvocationTargetException and re-thrown.

The method of handling InvocationTargetException exception is as follows:

View the root cause:

InvocationTargetException is a wrapper exception, which usually contains the method thrown by the called method specific exception. You can obtain the root cause of the exception through the getCause() method of InvocationTargetException, and then handle it according to the exception type of the root cause. For example:

try {
    // 反射调用方法
} catch (InvocationTargetException e) {
    Throwable cause = e.getCause();
    if (cause instanceof SomeException) {
        // 处理SomeException异常
    } else if (cause instanceof AnotherException) {
        // 处理AnotherException异常
    } else {
        // 处理其他异常
    }
}

Print exception information:

You can use the printStackTrace() method of InvocationTargetException to print exception information to facilitate debugging and problem location. For example:

try {
    // 反射调用方法
} catch (InvocationTargetException e) {
    e.printStackTrace();
}

Handling root cause exceptions:

Depending on the root cause exception type, different handling methods can be adopted. You can use try-catch statements to catch the root cause of exceptions and handle them accordingly. For example:

try {
    // 反射调用方法
} catch (InvocationTargetException e) {
    Throwable cause = e.getCause();
    try {
        throw cause;
    } catch (SomeException se) {
        // 处理SomeException异常
    } catch (AnotherException ae) {
        // 处理AnotherException异常
    } catch (Exception ex) {
        // 处理其他异常
    }
}

Distinguish between business exceptions and system exceptions:

When handling InvocationTargetException exceptions, the root cause exceptions can be divided into business exceptions and system exceptions. Business exceptions are exceptions that may occur during the normal operation of the program and can be processed according to business logic; system exceptions are exceptions caused by program errors or external environment problems, which generally require logging and alarming. You can use the instanceof keyword to determine the exception type and then handle it separately.

try {
    // 反射调用方法
} catch (InvocationTargetException e) {
    Throwable cause = e.getCause();
    if (cause instanceof BusinessException) {
        // 处理业务异常
    } else {
        // 处理系统异常，记录日志并告警
    }
}

Summary

The key to handling the InvocationTargetException exception is to obtain the root cause of the exception and handle it accordingly. The root cause of the exception can be obtained through the getCause() method, and then the handling method can be selected based on the exception type of the root cause. In addition, you can also print exception information, distinguish business exceptions and system exceptions, etc.

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