flink sql任务提交时遇到的Class冲突异常
在使用打包后的flink sql提交到flink集群中时，产生了如下异常：
org.apache.flink.client.program.ProgramInvocationException: The main method caused an error: Unable to instantiate java compiler
at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:335)
at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:205)
at org.apache.flink.client.ClientUtils.executeProgram(ClientUtils.java:138)
at org.apache.flink.client.cli.CliFrontend.executeProgram(CliFrontend.java:664)
at org.apache.flink.client.cli.CliFrontend.run(CliFrontend.java:213)
at org.apache.flink.client.cli.CliFrontend.parseParameters(CliFrontend.java:895)
at org.apache.flink.client.cli.CliFrontend.lambda$main$10(CliFrontend.java:968)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1628)
at org.apache.flink.runtime.security.HadoopSecurityContext.runSecured(HadoopSecurityContext.java:41)
at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:968)
Caused by: java.lang.IllegalStateException: Unable to instantiate java compiler
at org.apache.calcite.rel.metadata.JaninoRelMetadataProvider.compile(JaninoRelMetadataProvider.java:434)
at org.apache.calcite.rel.metadata.JaninoRelMetadataProvider.load3(JaninoRelMetadataProvider.java:375)
at org.apache.calcite.rel.metadata.JaninoRelMetadataProvider.lambda$static$0(JaninoRelMetadataProvider.java:109)
at org.apache.flink.calcite.shaded.com.google.common.cache.CacheLoader$FunctionToCacheLoader.load(CacheLoader.java:149)
at org.apache.flink.calcite.shaded.com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3542)
at org.apache.flink.calcite.shaded.com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2323)
at org.apache.flink.calcite.shaded.com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2286)
at org.apache.flink.calcite.shaded.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2201)
at org.apache.flink.calcite.shaded.com.google.common.cache.LocalCache.get(LocalCache.java:3953)
at org.apache.flink.calcite.shaded.com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3957)
at org.apache.flink.calcite.shaded.com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4875)
at org.apache.calcite.rel.metadata.JaninoRelMetadataProvider.create(JaninoRelMetadataProvider.java:475)
at org.apache.calcite.rel.metadata.JaninoRelMetadataProvider.revise(JaninoRelMetadataProvider.java:488)
at org.apache.calcite.rel.metadata.RelMetadataQuery.revise(RelMetadataQuery.java:193)
at org.apache.calcite.rel.metadata.RelMetadataQuery.getPulledUpPredicates(RelMetadataQuery.java:797)
at org.apache.calcite.rel.rules.ReduceExpressionsRule$ProjectReduceExpressionsRule.onMatch(ReduceExpressionsRule.java:298)
at org.apache.calcite.plan.AbstractRelOptPlanner.fireRule(AbstractRelOptPlanner.java:319)
at org.apache.calcite.plan.hep.HepPlanner.applyRule(HepPlanner.java:560)
at org.apache.calcite.plan.hep.HepPlanner.applyRules(HepPlanner.java:419)
at org.apache.calcite.plan.hep.HepPlanner.executeInstruction(HepPlanner.java:256)
at org.apache.calcite.plan.hep.HepInstruction$RuleInstance.execute(HepInstruction.java:127)
at org.apache.calcite.plan.hep.HepPlanner.executeProgram(HepPlanner.java:215)
at org.apache.calcite.plan.hep.HepPlanner.findBestExp(HepPlanner.java:202)
at org.apache.flink.table.planner.plan.optimize.program.FlinkHepProgram.optimize(FlinkHepProgram.scala:69)
at org.apache.flink.table.planner.plan.optimize.program.FlinkHepRuleSetProgram.optimize(FlinkHepRuleSetProgram.scala:87)
at org.apache.flink.table.planner.plan.optimize.program.FlinkChainedProgram$$anonfun$optimize$1.apply(FlinkChainedProgram.scala:62)
at org.apache.flink.table.planner.plan.optimize.program.FlinkChainedProgram$$anonfun$optimize$1.apply(FlinkChainedProgram.scala:58)
at scala.collection.TraversableOnce$$anonfun$foldLeft$1.apply(TraversableOnce.scala:157)
at scala.collection.TraversableOnce$$anonfun$foldLeft$1.apply(TraversableOnce.scala:157)
at scala.collection.Iterator$class.foreach(Iterator.scala:891)
at scala.collection.AbstractIterator.foreach(Iterator.scala:1334)
at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
at scala.collection.TraversableOnce$class.foldLeft(TraversableOnce.scala:157)
at scala.collection.AbstractTraversable.foldLeft(Traversable.scala:104)
at org.apache.flink.table.planner.plan.optimize.program.FlinkChainedProgram.optimize(FlinkChainedProgram.scala:57)
at org.apache.flink.table.planner.plan.optimize.StreamCommonSubGraphBasedOptimizer.optimizeTree(StreamCommonSubGraphBasedOptimizer.scala:170)
at org.apache.flink.table.planner.plan.optimize.StreamCommonSubGraphBasedOptimizer.doOptimize(StreamCommonSubGraphBasedOptimizer.scala:90)
at org.apache.flink.table.planner.plan.optimize.CommonSubGraphBasedOptimizer.optimize(CommonSubGraphBasedOptimizer.scala:77)
at org.apache.flink.table.planner.delegation.PlannerBase.optimize(PlannerBase.scala:248)
at org.apache.flink.table.planner.delegation.PlannerBase.translate(PlannerBase.scala:151)
at org.apache.flink.table.api.internal.TableEnvironmentImpl.translate(TableEnvironmentImpl.java:682)
at org.apache.flink.table.api.internal.TableEnvironmentImpl.sqlUpdate(TableEnvironmentImpl.java:495)
at realtime.log.reports.RealtimeUserReport$.active_user_10min(RealtimeUserReport.scala:245)
at realtime.log.reports.RealtimeUserReport$.main(RealtimeUserReport.scala:163)
at realtime.log.reports.RealtimeUserReport.main(RealtimeUserReport.scala)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:321)
... 11 more
Caused by: java.lang.ClassCastException: org.codehaus.janino.CompilerFactory cannot be cast to org.codehaus.commons.compiler.ICompilerFactory
at org.codehaus.commons.compiler.CompilerFactoryFactory.getCompilerFactory(CompilerFactoryFactory.java:129)
at org.codehaus.commons.compiler.CompilerFactoryFactory.getDefaultCompilerFactory(CompilerFactoryFactory.java:79)
at org.apache.calcite.rel.metadata.JaninoRelMetadataProvider.compile(JaninoRelMetadataProvider.java:432)
产生的原因：
pom文件的planner如下：
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-table-planner-blink_2.11</artifactId>
<version>${
flink.version}</version>
</dependency>
由于flink 1.10版本后，类的加载机制改为child-first，即优先加载jar包中的类，而以org.apache.flink开头的类等，总是会从父加载器加载，即从集群中的jar包加载。因此而产生了Class冲突
解决办法：
- 1） 修改scope,改为provided
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-table-planner-blink_2.11</artifactId>
<version>${
flink.version}</version>
<scope>provided</scope>
</dependency>
- 2） 引入shade插件，修改jar包中类的加载路径
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<relocations>
<relocation>
<pattern>org.apache.flink</pattern>
<shadedPattern>com.mycompany.org.apache.flink</shadedPattern>
</relocation>
</relocations>
</configuration>
</execution>
</executions>
</plugin>