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86 lines
2.0 KiB
Markdown
86 lines
2.0 KiB
Markdown
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Demonstrate the workflow of the `ognl` expression in the `watch` command in Arthas. You can modify the expressions in `Demo.java`, and compile and run the code.
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Project: https://github.com/hengyunabc/ognl-demo
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# Open the Demo.java file
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`src/main/java/com/example/ognl/Demo.java`{{open}}
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# Compile and run the code
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`mvn compile exec:java`{{execute}}
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输出结果包含`ognl`表达式输出结果：
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```java
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AtEnter, conditionExpress: params[0] > 1, conditionResult: true
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@ArrayList[
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@TestService[
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],
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@Object[][
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@Integer[1000],
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@String[hello],
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@Student[
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id=@Long[1],
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name=@String[tom],
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],
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],
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]
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```
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Expression in the code:
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```java
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String watchExpress = "{target, params, returnObj, #cost}";
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String conditionExpress = "params[0] > 1 && #cost > 0.1";
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```
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The result is similar to the following expression:
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```bash
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watch com.example.ognl.TestService test "{target, params, returnObj, #cost}" "params[0] > 1 && #cost > 0.1" -x 3
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```
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# View the expression result when the method throws an exception
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`mvn compile exec:java -DexceptionCase=true`{{execute}}
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The output:
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```java
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AtExceptionExit, conditionExpress: params[0] > 1, conditionResult: true
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@ArrayList[
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@TestService[
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],
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@Object[][
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@Integer[1000],
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@String[hello],
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@Student[com.example.ognl.Student@6e23bcdd],
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],
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java.lang.IllegalArgumentException: error
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at com.example.ognl.TestService.test(TestService.java:12)
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at com.example.ognl.Demo.test(Demo.java:43)
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at com.example.ognl.Demo.main(Demo.java:20)
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at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:254)
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at java.base/java.lang.Thread.run(Thread.java:832)
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,
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]
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```
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Expression in the code:
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```java
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String watchExpress = "{target, params, throwExp}";
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String conditionExpress = "params[0] > 1";
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```
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The result is similar to the following expression:
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```bash
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watch com.example.ognl.TestService test "{target, params, throwExp}" "params[0] > 1" -e -x 2
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```
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