Get system properties of the Java application through Http api and
extract the value of `java.class.path`{{}} .

`json_data=$(curl -Ss -XPOST http://localhost:8563/api -d '{ "action":"exec", "command":"sysprop" }')`{{execute T3}}

- Extract value with `sed`{{}} :

`class_path=$(echo $json_data | tr -d '\n' | sed 's/.*"java.class.path":"\([^"]*\).*/\1/'); echo "classpath: $class_path"`{{execute T3}}

- Extract value with `json_pp/awk`{{}} :

`class_path=$(echo $json_data | tr -d '\n' | json_pp | grep java.class.path | awk -F'"' '{ print $4 }'); echo "classpath: $class_path"`{{execute T3}}

Output:

```
classpath: math-game.jar
```

NOTE:

- `echo $json_data | tr -d '\n'`{{}} : Delete line breaks (the value of
  `line.separator`{{}} ) to avoid affecting the processing of `sed`{{}} /`json_pp`{{}}
  commands.
- `awk -F'"' '{ print $4 }'`{{}} : Use double quote as delimiter