how to pass parameters in groovy script using some java code

Still not sure what your use case is.

If you have soapui project, you can run it from soapui tool, or testrunner.bat/sh utility or from Java code using Junit etc. In any of these cases, it does not arise a case where you need to execute a groovy script. Looks you doing something different. If you tell exactly, that will help better.

Can you clarify?

I would also like to give you another example where I use it exactly reverse way that you mentioned

I use IDE create a class / methods in Java, this is entirely a different java project, compile, create jar, place it SOAPUI_HOME/bin/ext directory and soapui's groovy script call the java api like create object and call method.

Now it comes to properties.

If you see a groovy script test step editor's top right, you would read as:

"script is invoked with context, log, testRunner variables"

So, now i would just refine java class's Constructor which can take these parameters and have these variables available in java.

Here is sample java code:

/**
* this class is initialized and called from groovy script
**/
import com.eviware.soapui.model.testsuite.TestCaseRunContext
import com.eviware.soapui.model.testsuite.TestCaseRunner
import org.apache.log4j.Logger

public class ScriptHerlper {

  public TestCaseRunContext context;
  public Logger log;
  public TestCaseRunner testRunner;

  public ScriptHerlper(TestCaseRunContext context, Logger log) {
    this.context = context;
    this.log = log;
    this.testRunner = context.getTestRunner();
  }

  public void execute() {
    log.info("This is in execute method of ScriptHerlper class");
    String myPropertyValue = context.getTestCase().getPropertyValue("ACCESS_TOKEN");
    log.info("TestCase property ACCESS_TOKEN value is :"+myPropertyValue);
  }
  
}

As mentioned, compile above class, create jar, place it under SOAPUI_HOME/bin/ext directory and restart soapui.

A groovy script now will look:

//creating a test case level property say ACCESS_TOKEN
context.testCase.setPropertyValue('ACCESS_TOKEN', '1234-a3h-45ab-12dh2g')
def myScriptHelper = new ScriptHelper(context, log)
//ACCESS_TOKEN will be accessed in execute method.
myScriptHelper.execute()

Hope this helps at least understanding of how properties can be accessed between groovy and java.

Also note that, context is a variables which is something that varies at different levels of scripting such as Setup and Tear down scripts of test case, Test Suite, and Project.