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The result value of `watch` is generated by calculating the
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`watch-express` ognl expression. You can change the ognl expression to
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generate the desired value, please refer to
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[OGNL document](https://commons.apache.org/proper/commons-ognl/language-guide.html).
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> Maps can also be created using a special syntax.
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>
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>#{ "foo" : "foo value", "bar" : "bar value" }
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>
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>This creates a Map initialized with mappings for "foo" and "bar".
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The following command generates values in map format:
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```bash
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watch *MathGame prime* '#{ "params" : params, "returnObj" : returnObj, "throwExp": throwExp}' -x 2 -n 5
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```
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Execute the above command in Telnet shell/WebConsole, the output result:
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```bash
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ts=2020-08-06 16:57:20; [cost=0.241735ms] result=@LinkedHashMap[
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@String[params]:@Object[][
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@Integer[1],
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],
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@String[returnObj]:@ArrayList[
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@Integer[2],
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@Integer[241],
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@Integer[379],
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],
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@String[throwExp]:null,
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]
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```
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Execute the above command with Http api, pay attention to escaping the JSON double quotes:
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`
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curl -Ss -XPOST http://localhost:8563/api -d @- << EOF
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{
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"action":"exec",
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"execTimeout": 30000,
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"command":"watch *MathGame prime* '#{ \"params\" : params, \"returnObj\" : returnObj, \"throwExp\": throwExp}' -n 3 "
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}
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EOF`{{execute T3}}
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Http api execution result:
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```json
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{
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"body": {
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...
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"results": [
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...
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{
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...
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"type": "watch",
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"value": {
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"params": [
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1
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],
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"returnObj": [
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2,
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5,
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17,
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23,
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23
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]
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}
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},
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{
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...
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"type": "watch",
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"value": {
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"params": [
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-98278
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],
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"throwExp": {
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"@type": "java.lang.IllegalArgumentException",
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"localizedMessage": "number is: -98278, need >= 2",
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"message": "number is: -98278, need >= 2",
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"stackTrace": [
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...
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]
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}
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}
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},
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...
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}
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```
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You can see that the value of the watch result becomes a map object, and
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the program can read value through a key .
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