huahuang12 commented on issue #6752: tranquility kafka version 52.0 URL: https://github.com/apache/incubator-druid/issues/6752#issuecomment-448840691 > 您需要使用Java 8或禁用咖啡因缓存。 > > 请注意，doc页面（http://druid.io/docs/0.9.2/development/extensions-core/caffeine-cache.html）提到： > > > 基于Caffeine的德鲁伊高性能本地缓存实现。需要JRE8u60或更高版本 I rebuilt the operating environment with jdk1.8, and when I first started tranquility kafka, I could normally write kafka data into druid. When I modified the Java variable to 1.7, the following error occurred when I started tranquility kafka service again.Tranquility - distribution - 0.8.0 lib directory. IO druid. The druid - processing - 0.9.0. Jar is no IO/druid/query/lookup/LookupExtractorFactory class, because it belongs to the druid lib directory of the druid - processing - 0.9.2. Jar package, why is this case? 我使用jdk1.8重新搭建了运行环境，第一次启动 tranquility kafka可以正常将kafka数据写入druid,当我修改java变量 ，为1.7版本，再次启动 tranquility kafka 服务出现如下错误，tranquility-distribution-0.8.0 lib目录下io.druid.druid-processing-0.9.0.jar 确实没有 io/druid/query/lookup/LookupExtractorFactory 类，因为它属于druid lib 目录下的druid-processing-0.9.2.jar 包，为什么会出现这种情况呢？ 2018-12-20 10:29:15,119 [KafkaConsumer-1] INFO i.d.initialization.Initialization - Loading extension [mysql-metadata-storage] for class [io.druid.initialization.DruidModule] 2018-12-20 10:29:15,120 [KafkaConsumer-1] INFO i.d.initialization.Initialization - added URL[file:/bigdata/druid-0.9.2/extensions/mysql-metadata-storage/mysql-connector-java-5.1.38.jar] 2018-12-20 10:29:15,120 [KafkaConsumer-1] INFO i.d.initialization.Initialization - added URL[file:/bigdata/druid-0.9.2/extensions/mysql-metadata-storage/mysql-metadata-storage-0.9.2.jar] 2018-12-20 10:29:15,123 [KafkaConsumer-1] INFO i.d.initialization.Initialization - Adding local file system extension module [io.druid.metadata.storage.mysql.MySQLMetadataStorageModule] for class [io.druid.initialization.DruidModule] 2018-12-20 10:29:15,162 [KafkaConsumer-1] ERROR c.m.tranquility.kafka.KafkaConsumer - Exception: java.lang.NoClassDefFoundError: io/druid/query/lookup/LookupExtractorFactory at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_131] at java.lang.ClassLoader.defineClass(ClassLoader.java:763) ~[na:1.8.0_131] at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[na:1.8.0_131] at java.net.URLClassLoader.defineClass(URLClassLoader.java:467) ~[na:1.8.0_131] at java.net.URLClassLoader.access$100(URLClassLoader.java:73) ~[na:1.8.0_131] at java.net.URLClassLoader$1.run(URLClassLoader.java:368) ~[na:1.8.0_131] at java.net.URLClassLoader$1.run(URLClassLoader.java:362) ~[na:1.8.0_131] at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_131] at java.net.URLClassLoader.findClass(URLClassLoader.java:361) ~[na:1.8.0_131] at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_131] at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_131] at io.druid.server.lookup.LookupExtractionModule$1.setupModule(LookupExtractionModule.java:43) ~[na:na] at com.fasterxml.jackson.databind.ObjectMapper.registerModule(ObjectMapper.java:549) ~[com.fasterxml.jackson.core.jackson-databind-2.4.6.jar:2.4.6] at com.metamx.tranquility.druid.DruidGuicer$$anonfun$registerWithJackson$1$1.apply(DruidGuicer.scala:82) ~[io.druid.tranquility-core-0.8.0.jar:0.8.0] at com.metamx.tranquility.druid.DruidGuicer$$anonfun$registerWithJackson$1$1.apply(DruidGuicer.scala:81) ~[io.druid.tranquility-core-0.8.0.jar:0.8.0] at scala.collection.Iterator$class.foreach(Iterator.scala:742) ~[org.scala-lang.scala-library-2.11.7.jar:na] at scala.collection.AbstractIterator.foreach(Iterator.scala:1194) ~[org.scala-lang.scala-library-2.11.7.jar:na] at scala.collection.IterableLike$class.foreach(IterableLike.scala:72) ~[org.scala-lang.scala-library-2.11.7.jar:na] at scala.collection.AbstractIterable.foreach(Iterable.scala:54) ~[org.scala-lang.scala-library-2.11.7.jar:na] at com.metamx.tranquility.druid.DruidGuicer.registerWithJackson$1(DruidGuicer.scala:80) ~[io.druid.tranquility-core-0.8.0.jar:0.8.0] at com.metamx.tranquility.druid.DruidGuicer.com$metamx$tranquility$druid$DruidGuicer$$toGuiceModule$1(DruidGuicer.scala:89) ~[io.druid.tranquility-core-0.8.0.jar:0.8.0] at com.metamx.tranquility.druid.DruidGuicer$$anonfun$3.apply(DruidGuicer.scala:127) ~[io.druid.tranquility-core-0.8.0.jar:0.8.0] at com.metamx.tranquility.druid.DruidGuicer$$anonfun$3.apply(DruidGuicer.scala:127) ~[io.druid.tranquility-core-0.8.0.jar:0.8.0] at scala.collection.immutable.Stream$$anonfun$map$1.apply(Stream.scala:418) ~[org.scala-lang.scala-library-2.11.7.jar:na] at scala.collection.immutable.Stream$$anonfun$map$1.apply(Stream.scala:418) ~[org.scala-lang.scala-library-2.11.7.jar:na] at scala.collection.immutable.Stream$Cons.tail(Stream.scala:1233) ~[org.scala-lang.scala-library-2.11.7.jar:na] at scala.collection.immutable.Stream$Cons.tail(Stream.scala:1223) ~[org.scala-lang.scala-library-2.11.7.jar:na] at scala.collection.generic.Growable$class.loop$1(Growable.scala:54) ~[org.scala-lang.scala-library-2.11.7.jar:na]
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