Problem Description #

I'm following the Autodesk Forge Java tutorial and using the official sample code to create a new Bucket, but it fails with only the error message com.autodesk.client.ApiException: error. I'm wondering if other users have encountered and resolved this issue, or if there's any relevant experience to share. Also, the official GitHub sample program is incomplete, so I can't check if there's a problem with the Servlet mapping.

Here's the error stack trace:

com.autodesk.client.ApiClient.invokeAPI(ApiClient.java:581), 
com.autodesk.client.api.BucketsApi.createBucket(BucketsApi.java:113), 
forgesample.oss.doPost(oss.java:141), 
javax.servlet.http.HttpServlet.service(HttpServlet.java:661), 
javax.servlet.http.HttpServlet.service(HttpServlet.java:742), 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231), 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166), 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52), 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193), 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166), 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198), 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96), 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496), 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140), 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81), 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650), 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87), 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342), 
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803), 
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66), 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790), 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468), 
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49), 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142), 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617), 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61), 
java.lang.Thread.run(Thread.java:745)

Additional Note: I successfully created a Bucket after using a more unique name, but the previous error only returned a generic 400 status code, and the stack trace provided very limited helpful information.

Solution & Experience Sharing #

From your additional note, the core issue is most likely non-unique Bucket name — Forge Bucket names are globally unique across all users, so you can't use a name that already exists. This is a common pitfall for beginners. The 400 error you encountered corresponds to the status code returned by the Forge API when there's a Bucket name conflict (officially, the API returns a 400 Bad Request with the specific message Bucket already exists, but the Java SDK might not parse this detailed info, only returning the vague ApiException: error).

Here are some practical suggestions for troubleshooting such issues:

• Ensure global uniqueness of Bucket names: Add a unique prefix (like your client ID), timestamp, or random string to the name, e.g., my-forge-app-20240520-12345, to avoid conflicts with other users' Buckets.
• Capture detailed error information: The default ApiException only shows a simple description. You can modify your code to print the HTTP status code and response body when catching the exception, which will give you the specific error details from the Forge API:

  try {
      // Your Bucket creation code here
      bucketsApi.createBucket(createBucketPayload, region, null);
  } catch (ApiException e) {
      System.err.println("HTTP Status Code: " + e.getCode());
      System.err.println("Error Details: " + e.getResponseBody());
      e.printStackTrace();
  }
  

• Check Servlet mapping: If you still have issues related to Servlet mapping later, manually verify your web.xml configuration (or annotation-based setup if using Spring Boot). Make sure the doPost method in oss.java is correctly mapped to the intended URL path, with proper <servlet> and <servlet-mapping> entries if using XML config.

Also, since the official sample code might lack some details, it's helpful to cross-reference with the Forge official API documentation to understand parameter requirements and error responses for each endpoint. This will help you troubleshoot issues more efficiently.

内容的提问来源于stack exchange，提问作者Widnmax J