Pentaho 如何在kettle中的用户定义Java类中获取字段值?
我试图从下面的转换中获取Pentaho 如何在kettle中的用户定义Java类中获取字段值?,pentaho,kettle,pentaho-spoon,Pentaho,Kettle,Pentaho Spoon,我试图从下面的转换中获取用户定义Java类步骤中的链接字段。 下面是我在用户定义的Java类中编写的代码: private String link; public boolean processRow(StepMetaInterface smi, StepDataInterface sdi) throws KettleException { Object[] r=getRow(); if (r == null) { setOutputDone();
用户定义Java类
步骤中的链接
字段。
下面是我在用户定义的Java类中编写的代码:
private String link;
public boolean processRow(StepMetaInterface smi, StepDataInterface sdi) throws KettleException
{
Object[] r=getRow();
if (r == null) {
setOutputDone();
return false;
}
if (first) {
link = getParameter("Link");
first = false;
}
String linkField = get(Fields.In, link).getString(r);
logBasic("link:" + link);
return true;
}
当我运行上述代码时,以下是在用户定义的Java类步骤中得到的错误:
2016/06/28 11:26:57 - User Defined Java Class.0 - ERROR (version 5.4.0.1-130, build 1 from 2015-06-14_12-34-55 by buildguy) : Unexpected error
2016/06/28 11:26:57 - User Defined Java Class.0 - ERROR (version 5.4.0.1-130, build 1 from 2015-06-14_12-34-55 by buildguy) : org.pentaho.di.core.exception.KettleStepException:
2016/06/28 11:26:57 - User Defined Java Class.0 - Unable to find In field helper for field name 'null'
2016/06/28 11:26:57 - User Defined Java Class.0 -
2016/06/28 11:26:57 - User Defined Java Class.0 - at org.pentaho.di.trans.steps.userdefinedjavaclass.TransformClassBase.get(TransformClassBase.java:628)
2016/06/28 11:26:57 - User Defined Java Class.0 - at Processor.processRow(Processor.java:15)
2016/06/28 11:26:57 - User Defined Java Class.0 - at org.pentaho.di.trans.steps.userdefinedjavaclass.UserDefinedJavaClass.processRow(UserDefinedJavaClass.java:1018)
2016/06/28 11:26:57 - User Defined Java Class.0 - at org.pentaho.di.trans.step.RunThread.run(RunThread.java:62)
2016/06/28 11:26:57 - User Defined Java Class.0 - at java.lang.Thread.run(Thread.java:745)
2016/06/28 11:26:57 - User Defined Java Class.0 - Finished processing (I=0, O=0, R=1, W=0, U=0, E=1)
要确认字段,这里是预览数据的快照,直到筛选行
步骤:
我哪里出错了?我找到了我失踪的地方。在
用户定义的Java类中,在下面的参数选项卡中,我需要显式定义字段名及其别名,例如: