肇事代碼是:

DataSet<Tuple3<Integer,Double,String>> in = env.readCsvFile("file://"+rootPath+"/"+"projection.csv").types(Integer.class, Double.class, String.class);

intellij提示如下:

Incompatible types. Required DataSet<Tuple3<Integer, Double, String>>

but 'types' was inferred to DataSource<Tuple3<T0, T1, T2>>:

no instance(s) of type variable(s) T0, T1, T2 exist

so that Tuple3<T0, T1, T2> conforms to Tuple3<Integer, Double, String>

?

解決方案:

import scala.Tuple2; import scala.Tuple3; 改成 import org.apache.flink.api.java.tuple.Tuple3; import org.apache.flink.api.java.tuple.Tuple2;

?

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