找不到java.nio.file.Path的类文件

我正在org.assertj:assertj-core:3.6.2测试我的android项目.根据官方讨论,我应该使用带有assertj 3.x的java 8.

这是我的测试类,我正在尝试验证何时执行单击代码可以启动预期的活动.

import android.content.Intent;

import org.assertj.core.api.Assertions;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.robolectric.Robolectric;
import org.robolectric.RobolectricTestRunner;
import org.robolectric.Shadows;
import org.robolectric.annotation.Config;
import org.robolectric.shadows.ShadowActivity;

@RunWith(RobolectricTestRunner.class)
@Config(constants = BuildConfig.class, sdk = 21)
public class LoginActivityTest {

    @Test
    public void testBtnLogin(){
        LoginActivity loginActivity = Robolectric.setupActivity(LoginActivity.class);

        loginActivity.findViewById(R.id.btnLogin)
                .performClick();

        Intent expectedIntent = new Intent(loginActivity,MainActivity.class);
        ShadowActivity shadowActivity = Shadows.shadowOf(loginActivity);
        Intent actualIntent = shadowActivity.getNextStartedActivity();
        Assertions.assertThat(actualIntent).isEqualTo(expectedIntent);
    }
}

但是当我运行测试时,我收到了这个错误:

:app:compileDebugUnitTestJavaWithJavac (Thread[Daemon worker,5,main]) started.
:app:compileDebugUnitTestJavaWithJavac
file or directory '/home/workspace/android/AndroidLib/app/src/testDebug/java', not found
Executing task ':app:compileDebugUnitTestJavaWithJavac' (up-to-date check took 0.006 secs) due to:
  Output file /home/workspace/android/AndroidLib/app/build/intermediates/classes/test/debug/com/cavalry/androidlib/sample/ui/activity/LoginActivityTest.class has been removed.
All input files are considered out-of-date for incremental task ':app:compileDebugUnitTestJavaWithJavac'.
Compiling with source level 1.7 and target level 1.7.
file or directory '/home/workspace/android/AndroidLib/app/src/testDebug/java', not found
Compiling with JDK Java compiler API.

/home/workspace/android/AndroidLib/app/src/test/java/com/cavalry/androidlib/sample/ui/activity/LoginActivityTest.java:43: error: cannot access Path
        Assertions.assertThat(actualIntent).isEqualTo(expectedIntent);
                  ^
  class file for java.nio.file.Path not found
1 error

:app:compileDebugUnitTestJavaWithJavac FAILED
:app:compileDebugUnitTestJavaWithJavac (Thread[Daemon worker,5,main]) completed. Took 0.556 secs.

我在谷歌搜索,发现它可能是由错误的java版本引起的(我真的不太确定).

以下是有关我的java配置的一些信息:

$ java -version
java version "1.8.0_112"
Java(TM) SE Runtime Environment (build 1.8.0_112-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.112-b15, mixed mode)

$ javac -version
javac 1.8.0_112


$ update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
------------------------------------------------------------
* 0            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      auto mode
  1            /home/java/jdk1.8.0_112/bin/java                 300       manual mode
  2            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      manual mode

在项目结构中,我将JDK设置为jdk1.8.0_112

如果它是由java版本引起的,我该怎么办？如果没有,那我该怎么办？