# blade create jvm throwCustomException

## 介绍

指定类方法抛自定义异常，命令可以简写为 `blade c jvm tce`

## 参数

以下是此场景特有参数，通用参数详见：\[blade create jvm]\(blade create jvm.md)

```
--effect-count string     影响的请求条数
--effect-percent string   影响的请求百分比
--exception string           异常类，带全包名，必须继承 java.lang.Exception 或 java.lang.Exception 本身
--exception-message string   指定异常类信息，默认值是 chaosblade-mock-exception
```

## 案例

类名：com.example.controller.DubboController，业务代码如下：

```
private String sayHello(String name) throws BeansException {
    demoService = (DemoService)SpringContextUtil.getBean("demoService");
    StringBuilder result = new StringBuilder();
    result.append(demoService.sayHello(name));
    return result.toString();
}
```

指定以上方法抛出 java.lang.Exception 异常，影响两条请求，命令如下

```
blade c jvm throwCustomException --exception java.lang.Exception --classname com.example.controller.DubboController --methodname sayHello --process tomcat --effect-count 2

{"code":200,"success":true,"result":"3abbe6fe97d6bc75"}
```

验证结果： 注入前： ![](/files/DIBBmLAAdTp649iqisLg)

注入后： ![](/files/04xPaojdXjKSQ56896eb)

第三次请求后恢复正常： ![](/files/ysnud2JkCDljeyvtckLD)

停止实验：

```
blade d 3abbe6fe97d6bc75
```

## 常见问题

Q: java.lang.Throwable not assign from java.lang.Exception A: 配置 --exception 参数值 java.lang.Throwable，其不是 java.lang.Exception 的子类


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://chaosblade-io.gitbook.io/chaosblade-help-zh-cn/blade-create-jvm/blade-create-jvm-throwcustomexception.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.