我正在尝试构建一个简单的管道，将数据从我们的 Cloud SQL (MySQL) 移动到 BigQuery。所有 JDBC 驱动程序工作正常（如果我使用垃圾桶作为接收器，我可以看到预览数据）并且传播了架构。
我创建了 BigQuery 数据库和表——但是当我运行管道时，我得到了以下错误，它并没有告诉我任何事情。这里出了什么问题？
java.lang.NullPointerException: null
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:877) ~[com.google.guava.guava-13.0.1.jar:na]
at com.google.common.collect.Lists$TransformingSequentialList.<init>(Lists.java:542) ~[com.google.guava.guava-13.0.1.jar:na]
at com.google.common.collect.Lists.transform(Lists.java:526) ~[com.google.guava.guava-13.0.1.jar:na]
at com.google.cloud.bigquery.FieldList.fromPb(FieldList.java:116) ~[na:na]
at com.google.cloud.bigquery.Schema.fromPb(Schema.java:107) ~[na:na]
at com.google.cloud.bigquery.TableDefinition$Builder.table(TableDefinition.java:120) ~[na:na]
at com.google.cloud.bigquery.StandardTableDefinition.fromPb(StandardTableDefinition.java:220) ~[na:na]
at com.google.cloud.bigquery.TableDefinition.fromPb(TableDefinition.java:155) ~[na:na]
at com.google.cloud.bigquery.TableInfo$BuilderImpl.<init>(TableInfo.java:183) ~[na:na]
at com.google.cloud.bigquery.Table.fromPb(Table.java:603) ~[na:na]
at com.google.cloud.bigquery.BigQueryImpl.getTable(BigQueryImpl.java:415) ~[na:na]
at io.cdap.plugin.gcp.bigquery.sink.AbstractBigQuerySink.validateSchema(AbstractBigQuerySink.java:237) ~[na:na]
at io.cdap.plugin.gcp.bigquery.sink.AbstractBigQuerySink.getBigQueryTableFields(AbstractBigQuerySink.java:316) ~[na:na]
at io.cdap.plugin.gcp.bigquery.sink.AbstractBigQuerySink.initOutput(AbstractBigQuerySink.java:126) ~[na:na]
at io.cdap.plugin.gcp.bigquery.sink.BigQuerySink.prepareRunInternal(BigQuerySink.java:83) ~[na:na]
at io.cdap.plugin.gcp.bigquery.sink.AbstractBigQuerySink.prepareRun(AbstractBigQuerySink.java:94) ~[na:na]
at io.cdap.plugin.gcp.bigquery.sink.AbstractBigQuerySink.prepareRun(AbstractBigQuerySink.java:59) ~[na:na]
at io.cdap.cdap.etl.common.plugin.WrappedBatchSink.lambda$prepareRun$0(WrappedBatchSink.java:52) ~[na:na]
at io.cdap.cdap.etl.common.plugin.Caller$1.call(Caller.java:30) ~[na:na]
at io.cdap.cdap.etl.common.plugin.StageLoggingCaller.call(StageLoggingCaller.java:40) ~[na:na]
at io.cdap.cdap.etl.common.plugin.WrappedBatchSink.prepareRun(WrappedBatchSink.java:51) ~[na:na]
at io.cdap.cdap.etl.common.plugin.WrappedBatchSink.prepareRun(WrappedBatchSink.java:37) ~[na:na]
at io.cdap.cdap.etl.common.submit.SubmitterPlugin.lambda$prepareRun$2(SubmitterPlugin.java:71) ~[na:na]
at io.cdap.cdap.internal.app.runtime.AbstractContext$2.run(AbstractContext.java:551) ~[na:na]
at io.cdap.cdap.data2.transaction.Transactions$CacheBasedTransactional.finishExecute(Transactions.java:224) ~[na:na]
at io.cdap.cdap.data2.transaction.Transactions$CacheBasedTransactional.execute(Transactions.java:211) ~[na:na]
at io.cdap.cdap.internal.app.runtime.AbstractContext.execute(AbstractContext.java:546) ~[na:na]
at io.cdap.cdap.internal.app.runtime.AbstractContext.execute(AbstractContext.java:534) ~[na:na]
at io.cdap.cdap.etl.common.submit.SubmitterPlugin.prepareRun(SubmitterPlugin.java:69) ~[na:na]
at io.cdap.cdap.etl.batch.PipelinePhasePreparer.prepare(PipelinePhasePreparer.java:111) ~[na:na]
at io.cdap.cdap.etl.batch.mapreduce.MapReducePreparer.prepare(MapReducePreparer.java:97) ~[na:na]
at io.cdap.cdap.etl.batch.mapreduce.ETLMapReduce.initialize(ETLMapReduce.java:192) ~[na:na]
at io.cdap.cdap.api.mapreduce.AbstractMapReduce.initialize(AbstractMapReduce.java:109) ~[na:na]
at io.cdap.cdap.api.mapreduce.AbstractMapReduce.initialize(AbstractMapReduce.java:32) ~[na:na]
at io.cdap.cdap.internal.app.runtime.batch.MapReduceRuntimeService$1.initialize(MapReduceRuntimeService.java:182) ~[na:na]
at io.cdap.cdap.internal.app.runtime.batch.MapReduceRuntimeService$1.initialize(MapReduceRuntimeService.java:177) ~[na:na]
at io.cdap.cdap.internal.app.runtime.AbstractContext.lambda$initializeProgram$1(AbstractContext.java:640) ~[na:na]
at io.cdap.cdap.internal.app.runtime.AbstractContext.execute(AbstractContext.java:600) ~[na:na]
at io.cdap.cdap.internal.app.runtime.AbstractContext.initializeProgram(AbstractContext.java:637) ~[na:na]
at io.cdap.cdap.internal.app.runtime.batch.MapReduceRuntimeService.beforeSubmit(MapReduceRuntimeService.java:547) ~[na:na]
at io.cdap.cdap.internal.app.runtime.batch.MapReduceRuntimeService.startUp(MapReduceRuntimeService.java:226) ~[na:na]
at com.google.common.util.concurrent.AbstractExecutionThreadService$1$1.run(AbstractExecutionThreadService.java:47) ~[com.google.guava.guava-13.0.1.jar:na]
at io.cdap.cdap.internal.app.runtime.batch.MapReduceRuntimeService$2$1.run(MapReduceRuntimeService.java:450) [na:na]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_222]