Error "Exception for source column 4 and target column 4" when executing a mapping

Symptom

A mapping which contains source columns with type "NVARCHAR" fails with an error similar to this one:

com.indy.engine.common.exceptions.EngineExceptionI: Exception for source column 4 and target column 4
                at com.indy.engine.actionCodes.JdbcActionCodeI.a(SourceFile:596)
                at com.indy.engine.actionCodes.JdbcActionCodeI.executeTrgDirectBindedInsert(SourceFile:665)
                at com.indy.engine.actionCodes.JdbcActionCodeI.executeDirectBindedFetch(SourceFile:971)
                at com.indy.engine.action.common.ActionCodeTypeI.executeDirectBindedCode(SourceFile:1399)
                at com.indy.engine.action.common.ActionCodeTypeI.executeBindedCode(SourceFile:1565)
                at com.indy.engine.action.common.ActionCodeTypeI.executeCode(SourceFile:1630)
                at com.indy.engine.action.common.ActionCodeTypeI.run(SourceFile:1805)
                at java.lang.Thread.run(Thread.java:662)
Caused by: java.sql.SQLException: Method not supported with this server. : IfxPreparedStatement.setNString(int,String)
                at com.informix.util.IfxErrMsg.getSQLException(IfxErrMsg.java:488)
                at com.informix.jdbc.IfxPreparedStatement.setNString(IfxPreparedStatement.java:5477)
                at org.apache.commons.dbcp.DelegatingPreparedStatement.setNString(DelegatingPreparedStatement.java:238)
                at org.apache.commons.dbcp.DelegatingPreparedStatement.setNString(DelegatingPreparedStatement.java:238)
                at com.indy.engine.actionCodes.convert.JdbcConverter.convertString(JdbcConverter.java:109)
                at com.indy.engine.actionCodes.convert.JdbcConverter$4.write(JdbcConverter.java:662)
                at com.indy.engine.actionCodes.convert.JdbcConverter$4.write(JdbcConverter.java:1)
                at com.indy.engine.actionCodes.loader.a.a(SourceFile:113)
                at com.indy.engine.actionCodes.JdbcActionCodeI.a(SourceFile:584

Solution

Some RDBMS technologies and some JDBC drivers do not support NVARCHAR conversions.

Within your workspace, you can set a JDBC option to avoid this kind of conversion: 

- Edit the .md file of the target RDBMS technology

- On the root node (the server node), choose Advanced, and add the property "JDBC.BIND.MANAGE_SET_NSTRING_AS_STRING"

- Save the technology