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Posted to users@hop.apache.org by "WeilerDavid (via GitHub)" <gi...@apache.org> on 2025/03/12 13:45:01 UTC

[D] 400 Bad Request using Apache Hop Server Endpoint for Workflow execution (hop)

GitHub user WeilerDavid created a discussion: 400 Bad Request using Apache Hop Server Endpoint for Workflow execution

I have Apache Hop Server running on a windows machine and want to execute the workflows and pipelines via Rest Api.

When i execute a Pipeline using: "http://127.0.0.1:8081/hop/startPipeline?name=testPipe" everything is working fine.

When i try to execute a workflow using: "http://127.0.0.1:8081/hop/startWorkflow?name=testWorkflow" i get a 400 Bad Request response with this content:

_java.lang.NullPointerException: Cannot invoke "String.length()" because "s" is null
	at java.base/java.net.URLEncoder.encode(URLEncoder.java:223)
	at org.apache.hop.www.StartWorkflowServlet.doGet(StartWorkflowServlet.java:176)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
	at org.apache.hop.www.BaseHttpServlet.service(BaseHttpServlet.java:102)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:550)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1624)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1435)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:501)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1594)
	at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1350)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:234)
	at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:59)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:567)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
	at org.eclipse.jetty.server.Server.handle(Server.java:516)
	at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:388)
	at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:633)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:380)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:277)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:105)
	at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129)
	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:383)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:882)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1036)
	at java.base/java.lang.Thread.run(Thread.java:1583)_

Has anyone an idea what's wrong with the request. 

In fact, the workflow will be executed successfully.

![image](https://github.com/user-attachments/assets/15975ba3-270a-4781-be7e-41a238f82329)

Thanks in advance for any ideas to solve this.

David



GitHub link: https://github.com/apache/hop/discussions/5013

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Re: [D] 400 Bad Request using Apache Hop Server Endpoint for Workflow execution (hop)

Posted by "dsanderbi (via GitHub)" <gi...@apache.org>.
GitHub user dsanderbi added a comment to the discussion: 400 Bad Request using Apache Hop Server Endpoint for Workflow execution

As i know to start a workflow you need Asynchronous Web Service. (/hop/asyncRun/?service=)
For transforms you will need the webservice. (hop/webService/?service=)



GitHub link: https://github.com/apache/hop/discussions/5013#discussioncomment-12475830

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Re: [D] 400 Bad Request using Apache Hop Server Endpoint for Workflow execution (hop)

Posted by "dsanderbi (via GitHub)" <gi...@apache.org>.
GitHub user dsanderbi deleted a comment on the discussion: 400 Bad Request using Apache Hop Server Endpoint for Workflow execution

As i know to start a workflow you need Asynchronous Web Service. (/hop/asyncRun/?service=)
For transforms you will need the webservice. (hop/webService/?service=)



GitHub link: https://github.com/apache/hop/discussions/5013#discussioncomment-12475830

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