本文整理了Java中org.springframework.util.Assert.isNull()方法的一些代码示例，展示了Assert.isNull()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Assert.isNull()方法的具体详情如下：
包路径：org.springframework.util.Assert
类名称：Assert
方法名：isNull

Assert.isNull介绍

[英]Assert that an object is null .

Assert.isNull(value);

[中]断言对象为null

Assert.isNull(value);

代码示例

代码示例来源：origin: spring-projects/spring-framework

/**
 * Assert that an object is {@code null}.
 * @deprecated as of 4.3.7, in favor of {@link #isNull(Object, String)}
 */
@Deprecated
public static void isNull(@Nullable Object object) {
  isNull(object, "[Assertion failed] - the object argument must be null");
}

代码示例来源：origin: org.springframework/spring-core

/**
 * Assert that an object is {@code null}.
 * @deprecated as of 4.3.7, in favor of {@link #isNull(Object, String)}
 */
@Deprecated
public static void isNull(@Nullable Object object) {
  isNull(object, "[Assertion failed] - the object argument must be null");
}

代码示例来源：origin: spring-projects/spring-batch

@Override
  public void doWith(Method method) throws IllegalArgumentException, IllegalAccessException {
    Annotation annotation = AnnotationUtils.findAnnotation(method, annotationType);
    if (annotation != null) {
      Assert.isNull(annotatedMethod.get(), "found more than one method on target class ["
          + clazz + "] with the annotation type [" + annotationType + "]");
      annotatedMethod.set(method);
    }
  }
});

代码示例来源：origin: spring-projects/spring-retry

public void doWith(Method method) throws IllegalArgumentException, IllegalAccessException {
    Annotation annotation = AnnotationUtils.findAnnotation(method, annotationType);
    if (annotation != null) {
      Assert.isNull(annotatedMethod.get(), "found more than one method on target class ["
          + clazz + "] with the annotation type [" + annotationType + "]");
      annotatedMethod.set(method);
    }
  }
});

代码示例来源：origin: spring-projects/spring-framework

/**
 * Configure a base URL to prepend URI templates with. The base URL must
 * have a scheme and host but may optionally contain a port and a path.
 * The base URL must be fully expanded and encoded which can be done via
 * {@link UriComponentsBuilder}.
 * @param baseUrl the base URL.
 */
public void setBaseUrl(@Nullable String baseUrl) {
  if (baseUrl != null) {
    UriComponents uriComponents = UriComponentsBuilder.fromUriString(baseUrl).build();
    Assert.hasText(uriComponents.getScheme(), "'baseUrl' must have a scheme");
    Assert.hasText(uriComponents.getHost(), "'baseUrl' must have a host");
    Assert.isNull(uriComponents.getQuery(), "'baseUrl' cannot have a query");
    Assert.isNull(uriComponents.getFragment(), "'baseUrl' cannot have a fragment");
  }
  this.baseUrl = baseUrl;
}

代码示例来源：origin: spring-projects/spring-security

@Override
public <T extends OAuth2AuthorizedClient> Mono<T> loadAuthorizedClient(String clientRegistrationId,
    Authentication authentication, ServerWebExchange serverWebExchange) {
  Assert.notNull(clientRegistrationId, "clientRegistrationId cannot be null");
  Assert.isNull(serverWebExchange, "serverWebExchange must be null");
  Assert.isTrue(isUnauthenticated(authentication), "The user " + authentication + " should not be authenticated");
  return Mono.fromSupplier(() -> (T) this.clientRegistrationIdToAuthorizedClient.get(clientRegistrationId));
}

代码示例来源：origin: spring-projects/spring-security

@Override
public Mono<Void> removeAuthorizedClient(String clientRegistrationId, Authentication authentication,
    ServerWebExchange serverWebExchange) {
  Assert.notNull(clientRegistrationId, "clientRegistrationId cannot be null");
  Assert.isNull(serverWebExchange, "serverWebExchange " + serverWebExchange + "must be null");
  Assert.isTrue(isUnauthenticated(authentication), "The user " + authentication + " should not be authenticated");
  return Mono.fromRunnable(() -> {
    this.clientRegistrationIdToAuthorizedClient.remove(clientRegistrationId);
  });
}

代码示例来源：origin: spring-projects/spring-data-mongodb

private IndexField(String key, @Nullable Direction direction, @Nullable Type type, @Nullable Float weight) {
  Assert.hasText(key, "Key must not be null or empty");
  if (Type.GEO.equals(type) || Type.TEXT.equals(type)) {
    Assert.isNull(direction, "Geo/Text indexes must not have a direction!");
  } else {
    Assert.notNull(direction, "Default indexes require a direction");
  }
  this.key = key;
  this.direction = direction;
  this.type = type == null ? Type.DEFAULT : type;
  this.weight = weight == null ? Float.NaN : weight;
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void isNullWithMessage() {
  Assert.isNull(null, "Bla");
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void isNullWithMessageSupplier() {
  Assert.isNull(null, () -> "enigma");
}

代码示例来源：origin: spring-projects/spring-batch

/**
 * Execute the statement to open the cursor.
 */
@Override
protected void doOpen() throws Exception {
  Assert.state(!initialized, "Stream is already initialized.  Close before re-opening.");
  Assert.isNull(rs, "ResultSet still open!  Close before re-opening.");
  initializeConnection();
  openCursor(con);
  initialized = true;
}

代码示例来源：origin: org.springframework/spring-web

/**
 * Configure a base URL to prepend URI templates with. The base URL must
 * have a scheme and host but may optionally contain a port and a path.
 * The base URL must be fully expanded and encoded which can be done via
 * {@link UriComponentsBuilder}.
 * @param baseUrl the base URL.
 */
public void setBaseUrl(@Nullable String baseUrl) {
  if (baseUrl != null) {
    UriComponents uriComponents = UriComponentsBuilder.fromUriString(baseUrl).build();
    Assert.hasText(uriComponents.getScheme(), "'baseUrl' must have a scheme");
    Assert.hasText(uriComponents.getHost(), "'baseUrl' must have a host");
    Assert.isNull(uriComponents.getQuery(), "'baseUrl' cannot have a query");
    Assert.isNull(uriComponents.getFragment(), "'baseUrl' cannot have a fragment");
  }
  this.baseUrl = baseUrl;
}

代码示例来源：origin: spring-projects/spring-security

@Override
public Mono<Void> saveAuthorizedClient(
    OAuth2AuthorizedClient authorizedClient,
    Authentication authentication, ServerWebExchange serverWebExchange) {
  Assert.notNull(authorizedClient, "authorizedClient cannot be null");
  Assert.isNull(serverWebExchange, "serverWebExchange must be null");
  Assert.isTrue(isUnauthenticated(authentication), "The user " + authentication + " should not be authenticated");
  return Mono.fromRunnable(() -> {
    String clientRegistrationId = authorizedClient.getClientRegistration().getRegistrationId();
    this.clientRegistrationIdToAuthorizedClient.put(clientRegistrationId, authorizedClient);
  });
}

代码示例来源：origin: spring-projects/spring-batch

@Override
public void beginCheckpoint() throws Exception {
  org.springframework.util.Assert.isTrue("algorithmPropertyValue1".equals(algorithmPropertyName1), "The value of algorithmPropertyValue1 does not equal algorithmPropertyValue1");
  org.springframework.util.Assert.isTrue("algorithmPropertyValue2".equals(algorithmPropertyName2), "The value of algorithmPropertyValue2 does not equal algorithmPropertyValue2");
  org.springframework.util.Assert.isTrue("annotationNamedAlgorithmPropertyValue".equals(annotationNamedProperty), "The annotationNamedAlgorithmPropertyValue does not equal annotationNamedAlgorithmPropertyValue");
  org.springframework.util.Assert.isNull(notDefinedProperty, "notDefinedProperty is not null");
  org.springframework.util.Assert.isNull(notDefinedAnnotationNamedProperty, "notDefinedAnnotationNamedProperty is not null");
}

代码示例来源：origin: spring-projects/spring-batch

@Override
public void beforeStep() throws Exception {
  org.springframework.util.Assert.isTrue("stepListenerPropertyValue1".equals(stepListenerPropertyName1), "The value of stepListenerPropertyValue1 does not equal stepListenerPropertyValue1");
  org.springframework.util.Assert.isTrue("stepListenerPropertyValue2".equals(stepListenerPropertyName2), "The value of stepListenerPropertyValue2 does not equal stepListenerPropertyValue2");
  org.springframework.util.Assert.isTrue("annotationNamedStepListenerPropertyValue".equals(annotationNamedProperty), "The value of annotationNamedStepListenerPropertyValue does note equal annotationNamedStepListenerPropertyValue");
  org.springframework.util.Assert.isNull(notDefinedProperty, "notDefinedProperty is not null");
  org.springframework.util.Assert.isNull(notDefinedAnnotationNamedProperty, "notDefinedAnnotationNamedProperty is not null");
}

代码示例来源：origin: spring-projects/spring-batch

@Override
public void open(Serializable serializable) throws Exception {
  org.springframework.util.Assert.isTrue("writerPropertyValue1".equals(writerPropertyName1), "The value of writerPropertyValue1 does not equal writerPropertyValue1");
  org.springframework.util.Assert.isTrue("writerPropertyValue2".equals(writerPropertyName2), "The value of writerPropertyValue2 does not equal writerPropertyValue2");
  org.springframework.util.Assert.isTrue("annotationNamedWriterPropertyValue".equals(annotationNamedProperty), "The value of annotationNamedWriterPropertyValue does not equal annotationNamedWriterPropertyValue");
  org.springframework.util.Assert.isNull(notDefinedProperty, "notDefinedProperty is not null");
  org.springframework.util.Assert.isNull(notDefinedAnnotationNamedProperty, "notDefinedAnnotationNamedProperty is not null");
}

代码示例来源：origin: spring-projects/spring-batch

@Override
  public Object processItem(Object o) throws Exception {
    org.springframework.util.Assert.isTrue("processorPropertyValue1".equals(processorPropertyName1), "The value of processorPropertyValue1 does not equal processorPropertyValue1");
    org.springframework.util.Assert.isTrue("processorPropertyValue2".equals(processorPropertyName2), "The value of processorPropertyValue2 does not equal processorPropertyValue2");
    org.springframework.util.Assert.isTrue("annotationNamedProcessorPropertyValue".equals(annotationNamedProperty), "The value of annotationNamedProcessorPropertyValue does not equal annotationNamedProcessorPropertyValue");
    org.springframework.util.Assert.isNull(notDefinedProperty, "The notDefinedProperty is not null");
    org.springframework.util.Assert.isNull(notDefinedAnnotationNamedProperty, "The notDefinedNamedProperty is not null");
    return o;
  }
}

代码示例来源：origin: spring-projects/spring-batch

@Override
  public String decide(javax.batch.runtime.StepExecution[] executions) throws Exception {
    org.springframework.util.Assert.isTrue("deciderPropertyValue1".equals(deciderPropertyName1), "The value of deciderPropertyValue1 does not equal deciderPropertyValue1");
    org.springframework.util.Assert.isTrue("deciderPropertyValue2".equals(deciderPropertyName2), "The value of deciderPropertyValue2 does not equal deciderPropertyValue2");
    org.springframework.util.Assert.isTrue("annotationNamedDeciderPropertyValue".equals(annotationNamedProperty), "The value of annotationNamedDeciderPropertyValue does not equal annotationNamedDeciderPropertyValue");
    org.springframework.util.Assert.isNull(notDefinedProperty, "notDefinedProperty is not null");
    org.springframework.util.Assert.isNull(notDefinedAnnotationNamedProperty, "notDefinedAnnotationNamedProperty is not null");
    return "step2";
  }
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void isNullWithNonNullObjectAndNullMessageSupplier() {
  thrown.expect(IllegalArgumentException.class);
  thrown.expectMessage(equalTo(null));
  Assert.isNull("foo", (Supplier<String>) null);
}

代码示例来源：origin: spring-projects/spring-framework

@Test
public void isNullWithNonNullObjectAndMessageSupplier() {
  thrown.expect(IllegalArgumentException.class);
  thrown.expectMessage("enigma");
  Assert.isNull("foo", () -> "enigma");
}