kennknowles commented on a change in pull request #11792:
URL: https://github.com/apache/beam/pull/11792#discussion_r431350972



##########
File path: runners/portability/java/build.gradle
##########
@@ -31,9 +45,123 @@ dependencies {
   compile project(path: ":sdks:java:harness", configuration: "shadow")
   compile library.java.vendored_grpc_1_26_0
   compile library.java.slf4j_api
+
   testCompile project(path: ":runners:core-construction-java", configuration: 
"testRuntime")
   testCompile library.java.hamcrest_core
   testCompile library.java.junit
   testCompile library.java.mockito_core
   testCompile library.java.slf4j_jdk14
+
+  validatesRunner project(path: ":sdks:java:core", configuration: "shadowTest")
+  validatesRunner project(path: ":runners:core-java", configuration: 
"testRuntime")
+  validatesRunner project(path: project.path, configuration: "testRuntime")
+}
+
+
+project.evaluationDependsOn(":sdks:java:core")
+project.evaluationDependsOn(":runners:core-java")
+
+ext.virtualenvDir = "${project.buildDir}/virtualenv"
+ext.localJobServicePidFile = "${project.buildDir}/local_job_service_pid"
+ext.localJobServicePortFile = project.hasProperty("localJobServicePortFile") ? 
project.property("localJobServicePortFile") : 
"${project.buildDir}/local_job_service_port"
+ext.localJobServiceStdoutFile = "${project.buildDir}/local_job_service_stdout"
+
+ext.pythonSdkDir = "${project.rootDir}/sdks/python"
+
+void execInVirtualenv(String... args) {
+  String shellCommand = ". ${virtualenvDir}/bin/activate && " + args.collect { 
arg -> "'" + arg.replaceAll("'", "\\'") + "'" }.join(" ")
+  exec {
+    workingDir pythonSdkDir
+    commandLine "sh", "-c", shellCommand
+  }
 }
+
+void execBackgroundInVirtualenv(String... args) {
+  String shellCommand = ". ${virtualenvDir}/bin/activate && " + args.collect { 
arg -> "'" + arg.replaceAll("'", "\\'") + "'" }.join(" ")
+  println "execBackgroundInVirtualEnv: ${shellCommand}"
+  ProcessBuilder pb = new 
ProcessBuilder().redirectErrorStream(true).directory(new 
File(pythonSdkDir)).command(["sh", "-c", shellCommand])
+  Process proc = pb.start();
+
+  // redirectIO does not work for connecting to groovy/gradle stdout
+  BufferedReader reader = new BufferedReader(new 
InputStreamReader(proc.getInputStream()));
+  String line
+  while ((line = reader.readLine()) != null) {
+    println line
+  }
+  proc.waitFor();
+}
+
+task virtualenv {

Review comment:
       I hey now I recall - `applyPythonNature` causes conflicting 
configurations. Really would like to move away from these nature things.




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