Function Compute:Error handling

Error types

• If an error occurs when a function is being executed, Function Compute captures the error and returns an error message.

  Sample code:

  package example;
  
  import com.aliyun.fc.runtime.Context;
  import com.aliyun.fc.runtime.StreamRequestHandler;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  
  public class HelloFC implements StreamRequestHandler {
  
      @Override
      public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) throws IOException {
          throw new IOException("oops");
      }
  } 

  When the function is invoked, the following response is returned:

  {
    "errorMessage" : "oops",
    "errorType" : "java.io.IOException",
    "errorCause" : "oops",
    "stackTrace" : [ "example.HelloFC.handleRequest(HelloFC.java:15)" ]
  }

• If your function proactively exits while it is running, the system returns a general error message.

  Sample code:

  package example;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  
  import com.aliyun.fc.runtime.Context;
  import com.aliyun.fc.runtime.StreamRequestHandler;
  
  public class App implements StreamRequestHandler {
  
      @Override
      public void handleRequest(InputStream inputStream, OutputStream outputStream, Context context) throws IOException {
          System.exit(-1);
      }
  }

  When the function is invoked, the following response is returned:

  {
    errorMessage: 'Process exited unexpectedly before completing request (duration: 43ms, maxMemoryUsage: 65MB)'
  }

Error information

For more error types, see Error handling.