GitHub user UEMravamo added a comment to the discussion: User Java Class Step
"Cannot determine simple type name "StepMetaInterface""
Thanks @bamaer and good afternoon and happy week community !
I'm almost done with the examples, and now I wanted to add one that returns
more than one result, but I'm getting a strange error:
> "Unable to find Out field helper for field name 'null'" .
I think it might be related to what you mentioned about the parameters, but I
copied the code (Java file attached), and I'm not sure if the issue is caused
by the variable I'm passing into putRow.
```
2025/04/07 13:34:58 - java - Execution started for pipeline [java]
2025/04/07 13:34:59 - Generate Rows.0 - Finished processing (I=0, O=0, R=0,
W=10, U=0, E=0)
java.lang.RuntimeException: org.apache.hop.core.exception.HopTransformException:
Unable to find Out field helper for field name 'null'
at Processor.processRow(Unknown Source)
at
org.apache.hop.pipeline.transforms.userdefinedjavaclass.UserDefinedJavaClass.processRow(UserDefinedJavaClass.java:911)
at org.apache.hop.pipeline.transform.RunThread.run(RunThread.java:54)
at java.base/java.lang.Thread.run(Thread.java:1583)
Caused by: org.apache.hop.core.exception.HopTransformException:
Unable to find Out field helper for field name 'null'
at
org.apache.hop.pipeline.transforms.userdefinedjavaclass.TransformClassBase.get(TransformClassBase.java:621)
... 4 more
2025/04/07 13:34:59 - uppercase.0 - ERROR: Unexpected error
2025/04/07 13:34:59 - uppercase.0 - ERROR: java.lang.RuntimeException:
org.apache.hop.core.exception.HopTransformException:
2025/04/07 13:34:59 - uppercase.0 - Unable to find Out field helper for field
name 'null'
2025/04/07 13:34:59 - uppercase.0 -
2025/04/07 13:34:59 - uppercase.0 - at Processor.processRow(Unknown Source)
2025/04/07 13:34:59 - uppercase.0 - at
org.apache.hop.pipeline.transforms.userdefinedjavaclass.UserDefinedJavaClass.processRow(UserDefinedJavaClass.java:911)
2025/04/07 13:34:59 - uppercase.0 - at
org.apache.hop.pipeline.transform.RunThread.run(RunThread.java:54)
2025/04/07 13:34:59 - uppercase.0 - at
java.base/java.lang.Thread.run(Thread.java:1583)
2025/04/07 13:34:59 - uppercase.0 - Caused by:
org.apache.hop.core.exception.HopTransformException:
2025/04/07 13:34:59 - uppercase.0 - Unable to find Out field helper for field
name 'null'
2025/04/07 13:34:59 - uppercase.0 -
2025/04/07 13:34:59 - uppercase.0 - at
org.apache.hop.pipeline.transforms.userdefinedjavaclass.TransformClassBase.get(TransformClassBase.java:621)
2025/04/07 13:34:59 - uppercase.0 - ... 4 more
2025/04/07 13:34:59 - uppercase.0 - Finished processing (I=0, O=0, R=1, W=0,
U=0, E=1)
2025/04/07 13:34:59 - java - Pipeline duration : 0.095 seconds [ 0.095" ]
```
```java
String firstnameField;
String lastnameField;
String nameField;
String dataField;
public boolean processRow() throws HopException {
if (first) {
firstnameField = getParameter("FIRSTNAME_FIELD");
lastnameField = getParameter("LASTNAME_FIELD");
nameField = getParameter("NAME_FIELD");
dataField = getParameter("DATA_FIELD");
first = false;
}
Object[] r = getRow();
if (r == null) {
setOutputDone();
return false;
}
Object[] outputRow = createOutputRow(r, data.outputRowMeta.size());
// Get input Fields
String firstname = get(Fields.In, firstnameField).getString(r);
String lastname = get(Fields.In, lastnameField).getString(r);
// set output Fields
String name = firstname + lastname;
get(Fields.Out, nameField).setValue(outputRow, name);
// It works fine if I comment out those lines, but as soon as I include
them again, the error shows up.
String dat = lastname + firstname ;
get(Fields.Out, dataField).setValue(outputRow, dat);
// Enviar la fila al siguiente paso
putRow(data.outputRowMeta, outputRow);
return true;
}```
GitHub link:
https://github.com/apache/hop/discussions/5117#discussioncomment-12750348
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