java - Flink does not run my appliation due to invalidtypesexception when using java8 lambdas -

i using flink , java8. when using lambda functions tuples , generic types, compiler ends exception

    /library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/bin/java -didea.launcher.port=7536 "-didea.launcher.bin.path=/applications/intellij idea.app/contents/bin" -dfile.encoding=utf-8 -classpath "/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/charsets.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/deploy.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/ext/cldrdata.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/ext/dnsns.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/ext/jaccess.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/ext/jfxrt.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/ext/localedata.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/ext/nashorn.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/ext/sunec.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/ext/sunjce_provider.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/ext/sunpkcs11.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/ext/zipfs.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/javaws.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/jce.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/jfr.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/jfxswt.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/jsse.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/management-agent.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/plugin.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/resources.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/jre/lib/rt.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/lib/ant-javafx.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/lib/dt.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/lib/javafx-mx.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/lib/jconsole.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/lib/packager.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/lib/sa-jdi.jar:/library/java/javavirtualmachines/jdk1.8.0_102.jdk/contents/home/lib/tools.jar:/users/hasan.guercan/git/flink-java-project/target/classes:/users/hasan.guercan/.m2/repository/org/apache/flink/flink-java/1.0.3/flink-java-1.0.3.jar:/users/hasan.guercan/.m2/repository/org/apache/flink/flink-core/1.0.3/flink-core-1.0.3.jar:/users/hasan.guercan/.m2/repository/org/apache/flink/flink-annotations/1.0.3/flink-annotations-1.0.3.jar:/users/hasan.guercan/.m2/repository/com/esotericsoftware/kryo/kryo/2.24.0/kryo-2.24.0.jar:/users/hasan.guercan/.m2/repository/com/esotericsoftware/minlog/minlog/1.2/minlog-1.2.jar:/users/hasan.guercan/.m2/repository/org/objenesis/objenesis/2.1/objenesis-2.1.jar:/users/hasan.guercan/.m2/repository/org/apache/avro/avro/1.7.6/avro-1.7.6.jar:/users/hasan.guercan/.m2/repository/org/apache/flink/flink-shaded-hadoop2/1.0.3/flink-shaded-hadoop2-1.0.3.jar:/users/hasan.guercan/.m2/repository/xmlenc/xmlenc/0.52/xmlenc-0.52.jar:/users/hasan.guercan/.m2/repository/commons-codec/commons-codec/1.4/commons-codec-1.4.jar:/users/hasan.guercan/.m2/repository/commons-io/commons-io/2.4/commons-io-2.4.jar:/users/hasan.guercan/.m2/repository/commons-net/commons-net/3.1/commons-net-3.1.jar:/users/hasan.guercan/.m2/repository/commons-collections/commons-collections/3.2.1/commons-collections-3.2.1.jar:/users/hasan.guercan/.m2/repository/javax/servlet/servlet-api/2.5/servlet-api-2.5.jar:/users/hasan.guercan/.m2/repository/org/mortbay/jetty/jetty-util/6.1.26/jetty-util-6.1.26.jar:/users/hasan.guercan/.m2/repository/com/sun/jersey/jersey-core/1.9/jersey-core-1.9.jar:/users/hasan.guercan/.m2/repository/commons-el/commons-el/1.0/commons-el-1.0.jar:/users/hasan.guercan/.m2/repository/commons-logging/commons-logging/1.1.3/commons-logging-1.1.3.jar:/users/hasan.guercan/.m2/repository/com/jamesmurty/utils/java-xmlbuilder/0.4/java-xmlbuilder-0.4.jar:/users/hasan.guercan/.m2/repository/commons-lang/commons-lang/2.6/commons-lang-2.6.jar:/users/hasan.guercan/.m2/repository/commons-configuration/commons-configuration/1.7/commons-configuration-1.7.jar:/users/hasan.guercan/.m2/repository/commons-digester/commons-digester/1.8.1/commons-digester-1.8.1.jar:/users/hasan.guercan/.m2/repository/org/codehaus/jackson/jackson-core-asl/1.8.8/jackson-core-asl-1.8.8.jar:/users/hasan.guercan/.m2/repository/org/codehaus/jackson/jackson-mapper-asl/1.8.8/jackson-mapper-asl-1.8.8.jar:/users/hasan.guercan/.m2/repository/com/thoughtworks/paranamer/paranamer/2.3/paranamer-2.3.jar:/users/hasan.guercan/.m2/repository/org/xerial/snappy/snappy-java/1.0.5/snappy-java-1.0.5.jar:/users/hasan.guercan/.m2/repository/com/jcraft/jsch/0.1.42/jsch-0.1.42.jar:/users/hasan.guercan/.m2/repository/org/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idea.app/contents/lib/idea_rt.jar" com.intellij.rt.execution.application.appmain org.apache.flink.quickstart.exercise2.replygraph exception in thread "main" org.apache.flink.api.common.functions.invalidtypesexception: return type of function 'retrieve(replygraph.java:33)' not determined automatically, due type erasure. can give type information hints using returns(...) method on result of transformation call, or letting function implement 'resulttypequeryable' interface.     @ org.apache.flink.api.java.dataset.gettype(dataset.java:178)     @ org.apache.flink.api.java.dataset.collect(dataset.java:407)     @ org.apache.flink.api.java.dataset.print(dataset.java:1605)     @ org.apache.flink.quickstart.exercise2.replygraph.retrieve(replygraph.java:41)     @ org.apache.flink.quickstart.exercise2.replygraph.main(replygraph.java:56)     @ sun.reflect.nativemethodaccessorimpl.invoke0(native method)     @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62)     @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43)     @ java.lang.reflect.method.invoke(method.java:498)     @ com.intellij.rt.execution.application.appmain.main(appmain.java:147) caused by: org.apache.flink.api.common.functions.invalidtypesexception: generic type parameters of 'tuple3' missing.  seems compiler has not stored them .class file.  currently, eclipse jdt compiler preserves type information necessary use lambdas feature type-safely.  see documentation more information how compile jobs containing lambda expressions.     @ org.apache.flink.api.java.typeutils.typeextractor.validatelambdagenericparameter(typeextractor.java:1316)     @ org.apache.flink.api.java.typeutils.typeextractor.validatelambdagenericparameters(typeextractor.java:1302)     @ org.apache.flink.api.java.typeutils.typeextractor.getunaryoperatorreturntype(typeextractor.java:346)     @ org.apache.flink.api.java.typeutils.typeextractor.getunaryoperatorreturntype(typeextractor.java:304)     @ org.apache.flink.api.java.typeutils.typeextractor.getmapreturntypes(typeextractor.java:119)     @ org.apache.flink.api.java.dataset.map(dataset.java:215)     @ org.apache.flink.quickstart.exercise2.replygraph.retrieve(replygraph.java:33)     ... 6 more 

so have create @ least anonymous class solve problem. first code snippet represents code leads described exception:

dataset<mailentry> filtereduserreplymails = replymails.filter(entrytuple -> {             string sender = entrytuple.getfield(1).tostring();             return !sender.contains("git@") && !sender.contains("jira@");         }).map((entry -> {             mailentry mailentry = new mailentry();             mailentry.messageid = entry.f0.replaceall("<", "").replaceall(">", "");             mailentry.sender = entry.f1;             mailentry.replyto = entry.f2;             return mailentry;         }); 

next 1 working when creating anonymous class:

dataset<mailentry> filtereduserreplymails = replymails.filter(entrytuple -> {             string sender = entrytuple.getfield(1).tostring();             return !sender.contains("git@") && !sender.contains("jira@");         }).map(new mapfunction<tuple3<string, string, string>, mailentry>() {             @override             public mailentry map(tuple3<string, string, string> entry) throws exception {                 mailentry mailentry = new mailentry();                 mailentry.messageid = entry.f0.replaceall("<", "").replaceall(">", "");                 mailentry.sender = entry.f1;                 mailentry.replyto = entry.f2;                 return mailentry;             }         }); 

javas lambda function neat. how can solve problem without creating anonymous class?

try use returns method after map:

dataset<mailentry> filtereduserreplymails = replymails.filter(entrytuple -> {             string sender = entrytuple.getfield(1).tostring();             return !sender.contains("git@") && !sender.contains("jira@");         }).map(entry -> {             mailentry mailentry = new mailentry();             mailentry.messageid = entry.f0.replaceall("<", "").replaceall(">", "");             mailentry.sender = entry.f1;             mailentry.replyto = entry.f2;             return mailentry;         }).returns(mailentry.class);