Java Mockito NoSuchElementException when（）findById（）get（）然后return（）时

尝试使用Mockito库测试我的服务时，我遇到了一个问题，请查看下面的错误：

java.util.NoSuchElementException: No value present

at java.util.Optional.get(Optional.java:135)
at org.HappyRestApi.springREST.services.BankDepositServiceTests.findBankDepositById(BankDepositServiceTests.java:51)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

我曾试图通过在stack上使用类似的文章来解决此问题。有以下链接：

请看我的代码，其中涉及

存储库：

import org.HappyRestApi.springREST.domain.BankDeposit;
import org.springframework.data.jpa.repository.JpaRepository;

public interface BankDepositRepositorie extends JpaRepository<BankDeposit,Long> {
}

问题似乎与测试类中的这行代码有关：

when(bankDepositRepositorie.findById(anyLong()).get()).thenReturn(b1);

But i'm not really sure, does anyone have any suggestions?

该方法返回一个可选值，因此您可以尝试：

when(bankDepositRepositorie.findById(anyLong())).thenReturn(Optional.of(b1));

---

似乎init（）方法没有运行，正如@LukeWoodward提到的，Junit4和Junit5之间不匹配。将

@beforeach

替换为

可选之前的
@beforeach
。get
在
可选
为空时引发异常。使用
…（anyLong（））.orElse（null）.
代替。您的解决方案允许我再看一行，现在这行给了我java.lang.NullPointerException:BankDeposit结果=bankDepositService.findBankDepositById（1L）；这个解决方案为我提供了java.lang。NullPointerException@Szelek它在哪里为您提供了NullPointerException？@Daniem，在when（bankDepositRepositorie.findById（anyLong（））.thenReturn（可选）of（b1））行中@Szelek似乎没有使用init（）方法run@Szelek：
init（）
未被调用，因为您的测试类包含JUnit 4和JUnit 5注释的混合。尝试将每个

之前的替换为之前的。

when(bankDepositRepositorie.findById(anyLong()).get()).thenReturn(b1);

But i'm not really sure, does anyone have any suggestions?

when(bankDepositRepositorie.findById(anyLong())).thenReturn(Optional.of(b1));