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Could not initialize class com.twitter.ambrose.util.JSONUtil
java.lang.NoClassDefFoundError: Could not initialize class com.twitter.ambrose.util.JSONUtil	at com.twitter.ambrose.model.Event.toJson(Event.java:81)	at com.twitter.ambrose.service.impl.InMemoryStatsService.writeJsonEventToDisk(InMemoryStatsService.java:169)	at com.twitter.ambrose.service.impl.InMemoryStatsService.pushEvent(InMemoryStatsService.java:132)	at com.twitter.ambrose.hive.reporter.AmbroseHiveProgressReporter.pushEvent(AmbroseHiveProgressReporter.java:173)	at com.twitter.ambrose.hive.AmbroseHiveFailHook.run(AmbroseHiveFailHook.java:75)	at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1411)	at org.apache.hadoop.hive.ql.Driver.runInternal(Driver.java:1179)	at org.apache.hadoop.hive.ql.Driver.run(Driver.java:1006)	at org.apache.hadoop.hive.ql.Driver.run(Driver.java:996)	at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:247)	at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:199)	at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:410)	at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:345)	at org.apache.hadoop.hive.cli.CliDriver.processReader(CliDriver.java:443)	at org.apache.hadoop.hive.cli.CliDriver.processFile(CliDriver.java:459)	at org.apache.hadoop.hive.cli.CliDriver.executeDriver(CliDriver.java:739)	at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:677)	at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:616)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.apache.hadoop.util.RunJar.run(RunJar.java:221)	at org.apache.hadoop.util.RunJar.main(RunJar.java:136)