[英]java.lang.NoSuchMethodError: 'org.apache.flink.metrics.MetricGroup org.apache.flink.api.common.functions.RuntimeContext.getMetricGroup()'
[英]Flink error: java.lang.NoSuchMethodError: org.apache.flink.api.table.Table
我試圖使用flink的表和sql api作為一個簡單的示例,在該示例中,我從文件中讀取字符串,將其轉換為Tuple2並嘗試將其插入表中。 這是我的代碼。
import org.apache.flink.api.common.functions.FlatMapFunction;
import org.apache.flink.api.java.table.StreamTableEnvironment;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.api.table.Table;
import org.apache.flink.streaming.api.TimeCharacteristic;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.util.Collector;
public class table_streaming_test
{
public static void main (String[] args) throws Exception
{
StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(); //create execution environment
StreamTableEnvironment tEnv= StreamTableEnvironment.getTableEnvironment(env);
env.setParallelism(1);
DataStream<String> datastream_in= env.readTextFile("file:/home/rishikesh/new_workspace1/table_streaming/stocks.txt");
DataStream<Tuple2<String,Integer>> ds= datastream_in
.flatMap(new Splitter()); // transformation flatmap
Table msg=tEnv.fromDataStream(ds).as("symbol,price");
Table result = msg.select("symbol ='A'");
DataStream<String> ds2 =tEnv.toDataStream(result, String.class);
ds2.print();
env.execute();
}
public static class Splitter implements FlatMapFunction<String, Tuple2<String, Integer>> {
public void flatMap(String sentence, Collector<Tuple2<String, Integer>> out) throws Exception {
String[] token= sentence.split(",");
out.collect(new Tuple2<String, Integer>(token[0],Integer.parseInt(token[1])));
}
}
}
錯誤如下:(發生在DataStream<String> ds2 =tEnv.toDataStream(result, String.class);
)
log4j:WARN No appenders could be found for logger (org.apache.flink.api.java.typeutils.TypeExtractor).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread "main" java.lang.NoSuchMethodError: org.apache.flink.api.table.Table.<init>(Lorg/apache/flink/api/table/TableEnvironment;Lorg/apache/flink/api/table/plan/logical/LogicalNode;)V
at org.apache.flink.api.table.StreamTableEnvironment.ingest(StreamTableEnvironment.scala:97)
at org.apache.flink.api.java.table.StreamTableEnvironment.fromDataStream(StreamTableEnvironment.scala:61)
at table_streaming_test.main(table_streaming_test.java:87)
包含的jar文件包括:
JavaSE-1.7
錯誤“ java.lang.NoSuchMethodError”的可能原因之一是使用的flink版本與系統上安裝的版本不同。
對我來說,我有Flink 1.4.2,我使用的版本是1.3.2。 因此,我將pom文件更新為相同的版本,並且工作正常。
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