Question

我使用Spring-integration 4.1.1.RELEASE并拥有将消息有效负载中的文件上传到远程sFtp共享的代码。我正在使用像这样初始化的sFtpRemoteFileTemplate：

Expression remoteDirectoryExpression = new  LiteralExpression("si.sftp.sample");
SpelExpressionParser parser = new SpelExpressionParser();
Expression fileNameExpression = parser.parseExpression("payload.name");

template = new SftpRemoteFileTemplate(sessionFactory);
template.setCharset("UTF-8");
template.setBeanFactory(beanFactory);
template.setAutoCreateDirectory(true);
template.setRemoteDirectoryExpression(remoteDirectoryExpression);
template.setFileNameExpression(fileNameExpression);
template.setTemporaryFileSuffix(".writing");
template.setUseTemporaryFileName(true);

但是，在运行代码时，此警告会出现在我的日志文件中 - 模板中的每个表达式都会出现一次：

WARN   - o.s.i.e.ExpressionUtils: Creating EvaluationContext with no beanFactory
java.lang.RuntimeException: No beanfactory
at org.springframework.integration.expression.ExpressionUtils.createStandardEvaluationContext(ExpressionUtils.java:79) [spring-integration-core-4.1.1.RELEASE.jar:na]
at org.springframework.integration.util.AbstractExpressionEvaluator.getEvaluationContext(AbstractExpressionEvaluator.java:114) [spring-integration-core-4.1.1.RELEASE.jar:na]
at org.springframework.integration.util.AbstractExpressionEvaluator.getEvaluationContext(AbstractExpressionEvaluator.java:100) [spring-integration-core-4.1.1.RELEASE.jar:na]
at org.springframework.integration.util.AbstractExpressionEvaluator.evaluateExpression(AbstractExpressionEvaluator.java:164) [spring-integration-core-4.1.1.RELEASE.jar:na]
at org.springframework.integration.util.AbstractExpressionEvaluator.evaluateExpression(AbstractExpressionEvaluator.java:123) [spring-integration-core-4.1.1.RELEASE.jar:na]
at org.springframework.integration.handler.ExpressionEvaluatingMessageProcessor.processMessage(ExpressionEvaluatingMessageProcessor.java:72) [spring-integration-core-4.1.1.RELEASE.jar:na]

为什么？我还没有设法摆脱它，我怀疑Bean Factory实例没有委托给RemoteFileTemplate里面的ExpressionEvaluatingMessageProcessor（调用类已经实现了BeanFactoryAware，我已经验证了beanFactory字段是否正确填充了）。我已经为它创建了一个测试用例，我已经成功地重现了它。

@Test
public void shouldUploadFile() throws Exception
{
  Message<File> msg = MessageBuilder
    .withPayload(Fixture.getFile())
    .build();

  final String remoteDir = template.send(msg);
  org.junit.Assert.assertNotNull("remote file must exist", remoteDir);
  logger.info("uploaded file: \'{}\'", remoteDir);
  SftpTestUtils.cleanUp(template, Fixture.getFileName());
}

它不应该是ExpressionEvaluatingMessageProcessor的问题，因为这个测试用例在相同的上下文中没有警告地传递：

@Test
public void shouldTestProcessor()
{
  SpelExpressionParser parser = new SpelExpressionParser();
  Expression fileNameExpression = parser.parseExpression("payload.name");
  ExpressionEvaluatingMessageProcessor<String> fileNameProcessor = new ExpressionEvaluatingMessageProcessor<String>(
      fileNameExpression, String.class);
  fileNameProcessor.setBeanFactory(beanFactory);
  Message<File> message = MessageBuilder.withPayload(Fixture.getFile()).build();
  String fileName = fileNameProcessor.processMessage(message);
  org.junit.Assert.assertEquals("filename is not as expected", Fixture.getFileName(), fileName);
  logger.info("generated fileName: \'{}\'", fileName);
}

任何线索？

Answer 1

在Spring afterPropertiesSet()之外构建RFT时，需要调用ApplicationContext来完成RFT的初始化。

对于许多Spring Integration组件都是如此。

实施Lifecycle（非RFT）的人可能还需要start()。

Answer 2

您只需在日志中添加以下行

<logger name="org.springframework.integration.expression.ExpressionUtils"> <level value="ERROR"/> <appender-ref ref="console" /> </logger>

然后你不会得到这个警告..我希望

使用RemoteFileTemplate时，为什么在日志中出现意外的RuntimeException警告？

2 个答案: