Fix the java_worker_options parameter (#7537)

* fix Java CI

* Minor fix

* move json.loads out of build_java_worker_command

* lint

* fix cross language test

java/test/src/main/java/org/ray/api/test/BaseMultiLanguageTest.java

@@ -3,6 +3,7 @@ package org.ray.api.test;
 import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
+import com.google.gson.Gson;
 import java.io.File;
 import java.lang.ProcessBuilder.Redirect;
 import java.util.List;
@@ -77,8 +78,7 @@ public abstract class BaseMultiLanguageTest {
     String classpath = Stream.of(System.getProperty("java.class.path").split(":"))
         .filter(s -> !s.contains(" ") && s.contains("test"))
         .collect(Collectors.joining(":"));
-    String workerOptions =
-        " -classpath " + classpath;
+    String workerOptions = new Gson().toJson(ImmutableList.of("-classpath", classpath));
     // Start ray cluster.
     List<String> startCommand = ImmutableList.of(
         "ray",

java/test/src/main/resources/test_cross_language_invocation.py

@@ -52,7 +52,7 @@ def py_func_pass_python_actor_handle():
     counter = Counter.remote(2)
     f = ray.java_function("org.ray.api.test.CrossLanguageInvocationTest",
                           "callPythonActorHandle")
-    r = f.remote(counter._serialization_helper())
+    r = f.remote(counter._serialization_helper()[0])
     return ray.get(r)