使用Java代码从jenkins作业中获取参数

Question

I have a parameterised jenkins job that is accessing my plugin. Inside plugin's code in java, i require these parameters using which i have to trigger another job in jenkins. I am not able to fetch these parameters and it is a very high priority issue now. I ahve tried multiple solutions available on stackoverflow, for eg., tried accessing the environment variables but didn't received the param's value. for eg, my parameter is 'REPOS' and i need its value, i have tried :

System.getProperty("REPOS");

but it returns null.

Also, tried :

Map<String, String> env = System.getenv();
              for (String envName : env.keySet()) {
                  System.out.format("%s=%s%n", envName, env.get(envName));
              }

but it prints the jenkins' environment variables and not the job's parameters.

I am referring to the value passed in the text box beside param: "url" in the below picture.

Please assist.

Answer 1

To the best of my knowledge, Jenkins parameters are exposed as environment variables. However, if you use a build system like Maven that launches Java sub-processes, those variables might not be inherited.

Probably your most reliable approach is to explicitly pass parameters as system properties in your Jenkins configuration, eg -DREPOS=${REPOS}

Answer 2

One of the option to achieve this is "PASS and GET AS ARGUMENT" in your java code.

Jenkins's variables value can be retrieved like this.

urlValue=${url} 

Then pass this value in java code. This will be structure of your Execute shell in job configuration.

#!/bin/bash -e
urlValue=${url} 
# run java code
java <classNameToRun> $urlValue

Answer 3

Thanks for the suggestions, but it worked when i did the following: I hit the

JENKINS_HOST_URL/job/JENKINS_SEED_JOB_NAME/api/json?pretty=true

and found the current build number, thereafter, hitting jenkins again with this number (JENKINS_HOST_URL/job/JENKINS_SEED_JOB_NAME/currBuildNum/api/json?pretty=true) ,

I was able to fetch all the parameters passed in there in this build.