[英]ReflectionTestUtils set field with spring value annotation returning NPE
I have a class which implements a interface.我有一个实现接口的类。 That class has a private double field
field1
which reads value from application properties using @Value
spring annotation.该类有一个私有的双字段
field1
,它使用@Value
spring 注释从应用程序属性中读取值。
I'm developing tests and I need to populate that field from that class.我正在开发测试,我需要从该类中填充该字段。 To achieve that I'm using:
为了实现这一点,我正在使用:
ReflectionTestUtils.setField(Class.class, "field1", value, double.class);
I'm getting always null pointer exception, but the debug log shows:我总是收到空指针异常,但调试日志显示:
DEBUG org.springframework.test.util.ReflectionTestUtils - Setting field 'field1' of type [double] on target object [null] or target class [class com.abcClass] to value [value]
. DEBUG org.springframework.test.util.ReflectionTestUtils - Setting field 'field1' of type [double] on target object [null] or target class [class com.abcClass] to value [value]
。
Does someone know how can I set value to this field using reflection or just how to populate some value to this class field?有人知道如何使用反射为该字段设置值,或者如何为该类字段填充一些值? I don't have any instance of that class, but interfaces.
我没有该类的任何实例,但有接口。
the first argument is the instance, not the class第一个参数是实例,而不是类
YourClass object = new YourClass();
ReflectionTestUtils.setField(object, "field1", value);
It should be an instance of an object that you pass to setField.它应该是您传递给 setField 的对象的实例。 For instanse assuming Mockito it should go:
例如,假设 Mockito 它应该去:
@InjectMocks
AbcdImpl abcdImpl;
and then:进而:
ReflectionTestUtils.setField(abcdImpl, "field", "value");
here is my some example test for ReflectionTestUtils.这是我对 ReflectionTestUtils 的一些示例测试。
@ExtendWith(MockitoExtension.class)
class RedisConfigTest {
@Mock
JedisConnectionFactory jedisConnectionFactory;
@Mock
RedisTemplate redisTemplate;
@InjectMocks
@Spy
private RedisConfig config = new RedisConfig(jedisConnectionFactory, redisTemplate);
@BeforeEach
void setUp() {
ReflectionTestUtils.setField(config, "master", "mymaster");
ReflectionTestUtils.setField(config, "redisSentinels", "localhost:6379");
lenient().when(config.jedisConnectionFactory()).thenReturn(jedisConnectionFactory);
lenient().when(config.redisTemplate()).thenReturn(redisTemplate);
}
@Test
void jedisConnectionFactory(){
Assertions.assertEquals(config.jedisConnectionFactory(), jedisConnectionFactory);
}
I can not say why you get the NullPointer but I use the following form as class level annotation in my tests to set a property:我不能说你为什么得到 NullPointer 但我在我的测试中使用以下形式作为类级别注释来设置属性:
...
@TestPropertySource(properties = {
"key.from.properties=myValue",
})
public class MyTest {
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