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RMLio / RMLStreamer

The RMLStreamer executes RML rules to generate high quality Linked Data from multiple originally (semi-)structured data sources in a streaming way.
http://rml.io/
MIT License
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Web interface submission error #42

Open SemanticInteroperability opened 2 years ago

SemanticInteroperability commented 2 years ago

stay http://localhost:8081/#/submit Interface, I fill in _tofile --mapping-file /mnt/data/scenario-1/mapping.rml. ttl --output-path /mnt/data/scenario-1/output.nt in program arguments .According to your steps。 But it reported an error org.apache.flink.runtime.rest.handler.RestHandlerException: Could not execute application. at org.apache.flink.runtime.webmonitor.handlers.JarRunHandler.lambda$handleRequest$1(JarRunHandler.java:110) at java.base/java.util.concurrent.CompletableFuture.uniHandle(Unknown Source) at java.base/java.util.concurrent.CompletableFuture$UniHandle.tryFire(Unknown Source) at java.base/java.util.concurrent.CompletableFuture.postComplete(Unknown Source) at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(Unknown Source) at java.base/java.lang.Thread.run(Unknown Source) Caused by: java.util.concurrent.CompletionException: org.apache.flink.util.FlinkRuntimeException: Could not execute application. at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(Unknown Source) at java.base/java.util.concurrent.CompletableFuture.completeThrowable(Unknown Source) ... 2 more Caused by: org.apache.flink.util.FlinkRuntimeException: Could not execute application. at org.apache.flink.client.deployment.application.DetachedApplicationRunner.tryExecuteJobs(DetachedApplicationRunner.java:88) at org.apache.flink.client.deployment.application.DetachedApplicationRunner.run(DetachedApplicationRunner.java:70) at org.apache.flink.runtime.webmonitor.handlers.JarRunHandler.lambda$handleRequest$0(JarRunHandler.java:104) ... 2 more Caused by: org.apache.flink.client.program.ProgramInvocationException: The main method caused an error: None.get at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:372) at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:222) at org.apache.flink.client.ClientUtils.executeProgram(ClientUtils.java:114) at org.apache.flink.client.deployment.application.DetachedApplicationRunner.tryExecuteJobs(DetachedApplicationRunner.java:84) ... 4 more Caused by: java.util.NoSuchElementException: None.get at scala.None$.get(Option.scala:347) at scala.None$.get(Option.scala:345) at io.rml.framework.Main$.main(Main.scala:102) at io.rml.framework.Main.main(Main.scala) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.base/java.lang.reflect.Method.invoke(Unknown Source) at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:355) ... 7 more

Can you help me out? Looking forward to your reply!

ghsnd commented 2 years ago

Hi! This was a bug that has been fixed, but not released yet.

The best option to overcome this is to build RMLStreamer from the development branch, where it is fixed.

If not possible, a workaround is to add the -f parameter and an empty file as argument (e.g. -f /tmp/empty.txt) OR have it pointing to the descriptions of internal functions (like so: -f https://raw.githubusercontent.com/FnOio/idlab-functions-java/v0.1.0/src/main/resources/fno/functions_idlab.ttl,https://raw.githubusercontent.com/FnOio/idlab-functions-java/v0.1.0/src/main/resources/fno/functions_idlab_classes_java_mapping.ttl)

Hope this helps!