Using _id in aggregate functions throws an exception #135689
Description
Elasticsearch Version
9.2.0-SNAPSHOT, but also on 9.1.2
Installed Plugins
No response
Java Version
bundled
OS Version
N/A (runs on ECH)
Problem Description
When using the _id field in an aggregate function, ES throws the following exception:
java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null
Simple example query resulting in an exception:
FROM metrics-*.otel-* METADATA _id | STATS c = COUNT(_id) BY service.name This behavior appears to be indeterministic because it sometimes succeeds, but most of the time not.
The same happens also with other aggregate functions (e.g. ... SAMPLE(_id,10) ...).
Changing the above query by simply exchanging _id with * resolves the issue:
FROM metrics-*.otel-* METADATA _id | STATS c = COUNT(*) BY service.name Steps to Reproduce
- Go to https://otel.demo.elastic.co/
- Go to
Try ES|QLin Discover - Select a time range of 1 hour
- Run the following query:
FROM metrics-*.otel-* METADATA _id | STATS c = COUNT(_id) BY service.name (expand to see the) Error Stacktrace from Dev Tools
org.elasticsearch.ElasticsearchException$1: Cannot invoke "String.length()" because "v" is null at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.ElasticsearchException.guessRootCauses(ElasticsearchException.java:798) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.ElasticsearchException.generateFailureXContent(ElasticsearchException.java:712) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.rest.RestResponse.build(RestResponse.java:202) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.rest.RestResponse.<init>(RestResponse.java:161) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.rest.RestResponse.<init>(RestResponse.java:122) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.rest.action.RestActionListener.onFailure(RestActionListener.java:54) at org.elasticsearch.xpack.esql.action.EsqlResponseListener.lambda$wrapWithLogging$1(EsqlResponseListener.java:191) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeAcceptException(ActionListenerImplementations.java:78) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListener$2.onFailure(ActionListener.java:266) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.rest.action.RestCancellableNodeClient$1.onFailure(RestCancellableNodeClient.java:97) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.tasks.TaskManager$1.onFailure(TaskManager.java:240) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeAcceptException(ActionListenerImplementations.java:78) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeOnFailure(ActionListenerImplementations.java:89) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.DelegatingActionListener.onFailure(DelegatingActionListener.java:32) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$RunBeforeActionListener.onFailure(ActionListenerImplementations.java:360) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeAcceptException(ActionListenerImplementations.java:78) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeOnFailure(ActionListenerImplementations.java:89) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.DelegatingActionListener.onFailure(DelegatingActionListener.java:32) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.support.ContextPreservingActionListener.onFailure(ContextPreservingActionListener.java:40) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeAcceptException(ActionListenerImplementations.java:78) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeOnFailure(ActionListenerImplementations.java:89) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.DelegatingActionListener.onFailure(DelegatingActionListener.java:32) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeAcceptException(ActionListenerImplementations.java:78) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeOnFailure(ActionListenerImplementations.java:89) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.DelegatingActionListener.onFailure(DelegatingActionListener.java:32) at org.elasticsearch.xpack.esql.core.async.AsyncTaskManagementService.lambda$wrapStoringListener$5(AsyncTaskManagementService.java:258) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeAcceptException(ActionListenerImplementations.java:78) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListener$2.onFailure(ActionListener.java:266) at org.elasticsearch.xpack.esql.plugin.TransportEsqlQueryAction.lambda$innerExecute$9(TransportEsqlQueryAction.java:301) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeAcceptException(ActionListenerImplementations.java:78) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListener$2.onFailure(ActionListener.java:266) at org.elasticsearch.xpack.esql.execution.PlanExecutor.onQueryFailure(PlanExecutor.java:131) at org.elasticsearch.xpack.esql.execution.PlanExecutor.lambda$esql$1(PlanExecutor.java:106) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeAcceptException(ActionListenerImplementations.java:78) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListener$2.onFailure(ActionListener.java:266) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.support.SubscribableListener$FailureResult.complete(SubscribableListener.java:418) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.support.SubscribableListener.tryComplete(SubscribableListener.java:330) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.support.SubscribableListener.setResult(SubscribableListener.java:355) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.support.SubscribableListener.onFailure(SubscribableListener.java:267) at org.elasticsearch.xpack.esql.plugin.ComputeService.lambda$executePlan$11(ComputeService.java:308) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$DelegatingResponseActionListener.acceptException(ActionListenerImplementations.java:202) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeAcceptException(ActionListenerImplementations.java:78) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$DelegatingResponseActionListener.onFailure(ActionListenerImplementations.java:207) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeAcceptException(ActionListenerImplementations.java:78) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeOnFailure(ActionListenerImplementations.java:89) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.DelegatingActionListener.onFailure(DelegatingActionListener.java:32) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$RunBeforeActionListener.onFailure(ActionListenerImplementations.java:360) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeAcceptException(ActionListenerImplementations.java:78) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations.safeOnFailure(ActionListenerImplementations.java:89) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.DelegatingActionListener.onFailure(DelegatingActionListener.java:32) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$ResponseWrappingActionListener.onResponse(ActionListenerImplementations.java:263) at org.elasticsearch.xpack.esql.plugin.ComputeListener.lambda$new$0(ComputeListener.java:37) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$DelegatingFailureActionListener.onResponse(ActionListenerImplementations.java:233) at org.elasticsearch.compute.EsqlRefCountingListener.lambda$new$0(EsqlRefCountingListener.java:31) at org.elasticsearch.base@9.2.0-SNAPSHOT/org.elasticsearch.core.AbstractRefCounted$1.closeInternal(AbstractRefCounted.java:125) at org.elasticsearch.base@9.2.0-SNAPSHOT/org.elasticsearch.core.AbstractRefCounted.decRef(AbstractRefCounted.java:77) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.support.RefCountingRunnable.close(RefCountingRunnable.java:113) at org.elasticsearch.base@9.2.0-SNAPSHOT/org.elasticsearch.core.Releasables.close(Releasables.java:39) at org.elasticsearch.base@9.2.0-SNAPSHOT/org.elasticsearch.core.Releasables.closeExpectNoException(Releasables.java:72) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$2.run(ActionListenerImplementations.java:51) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:218) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$DelegatingResponseActionListener.onResponse(ActionListenerImplementations.java:198) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$DelegatingResponseActionListener.onResponse(ActionListenerImplementations.java:198) at org.elasticsearch.xpack.esql.plugin.ComputeListener.lambda$acquireCompute$2(ComputeListener.java:63) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListener$2.onResponse(ActionListener.java:258) at org.elasticsearch.xpack.esql.plugin.ComputeService.lambda$executePlan$19(ComputeService.java:419) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$DelegatingFailureActionListener.onResponse(ActionListenerImplementations.java:233) at org.elasticsearch.xpack.esql.plugin.ComputeListener.lambda$new$0(ComputeListener.java:37) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$DelegatingFailureActionListener.onResponse(ActionListenerImplementations.java:233) at org.elasticsearch.compute.EsqlRefCountingListener.lambda$new$0(EsqlRefCountingListener.java:31) at org.elasticsearch.base@9.2.0-SNAPSHOT/org.elasticsearch.core.AbstractRefCounted$1.closeInternal(AbstractRefCounted.java:125) at org.elasticsearch.base@9.2.0-SNAPSHOT/org.elasticsearch.core.AbstractRefCounted.decRef(AbstractRefCounted.java:77) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.support.RefCountingRunnable.close(RefCountingRunnable.java:113) at org.elasticsearch.base@9.2.0-SNAPSHOT/org.elasticsearch.core.Releasables.close(Releasables.java:39) at org.elasticsearch.base@9.2.0-SNAPSHOT/org.elasticsearch.core.Releasables.closeExpectNoException(Releasables.java:72) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$2.run(ActionListenerImplementations.java:51) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListener$1.onResponse(ActionListener.java:218) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$DelegatingResponseActionListener.onResponse(ActionListenerImplementations.java:198) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$DelegatingResponseActionListener.onResponse(ActionListenerImplementations.java:198) at org.elasticsearch.xpack.esql.plugin.ComputeListener.lambda$acquireCompute$2(ComputeListener.java:63) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListener$2.onResponse(ActionListener.java:258) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$RunBeforeActionListener.onResponse(ActionListenerImplementations.java:350) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$MappedActionListener.onResponse(ActionListenerImplementations.java:111) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListenerImplementations$RunAfterActionListener.onResponse(ActionListenerImplementations.java:312) at org.elasticsearch.compute.operator.DriverRunner$1.done(DriverRunner.java:65) at org.elasticsearch.compute.operator.DriverRunner$1.onResponse(DriverRunner.java:43) at org.elasticsearch.compute.operator.DriverRunner$1.onResponse(DriverRunner.java:40) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.action.ActionListener$2.onResponse(ActionListener.java:258) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.transport.TransportResponseHandler$1.handleResponse(TransportResponseHandler.java:55) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.transport.TransportResponseHandler$Empty.handleResponse(TransportResponseHandler.java:45) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.transport.TransportResponseHandler$Empty.handleResponse(TransportResponseHandler.java:37) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.transport.TransportService$UnregisterChildTransportResponseHandler.handleResponse(TransportService.java:1726) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.transport.TransportService$ContextRestoreResponseHandler.handleResponse(TransportService.java:1504) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.transport.TransportService$DirectResponseChannel.processResponse(TransportService.java:1602) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.transport.TransportService$DirectResponseChannel$1.doRun(TransportService.java:1582) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:27) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.common.util.concurrent.TimedRunnable.doRun(TimedRunnable.java:35) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:1067) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:27) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1090) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:614) at java.base/java.lang.Thread.run(Thread.java:1474) Caused by: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null at org.elasticsearch.index.mapper.BlockSourceReader.toBytesRef(BlockSourceReader.java:473) at org.elasticsearch.index.mapper.BlockStoredFieldsReader$Id.read(BlockStoredFieldsReader.java:172) at org.elasticsearch.compute.lucene.read.ValuesFromSingleReader$RowStrideReaderWork.read(ValuesFromSingleReader.java:216) at org.elasticsearch.compute.lucene.read.ValuesFromSingleReader.loadFromRowStrideReaders(ValuesFromSingleReader.java:168) at org.elasticsearch.compute.lucene.read.ValuesFromSingleReader.loadFromSingleLeaf(ValuesFromSingleReader.java:112) at org.elasticsearch.compute.lucene.read.ValuesFromSingleReader.load(ValuesFromSingleReader.java:58) at org.elasticsearch.compute.lucene.read.ValuesReader.next(ValuesReader.java:38) at org.elasticsearch.compute.lucene.read.ValuesReader.next(ValuesReader.java:18) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator$AppendBlocksIterator.next(AbstractPageMappingToIteratorOperator.java:345) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator$AppendBlocksIterator.next(AbstractPageMappingToIteratorOperator.java:321) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator$RuntimeTrackingIterator.next(AbstractPageMappingToIteratorOperator.java:190) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator$RuntimeTrackingIterator.next(AbstractPageMappingToIteratorOperator.java:175) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator.getOutput(AbstractPageMappingToIteratorOperator.java:149) at org.elasticsearch.compute.operator.Driver.runSingleLoopIteration(Driver.java:272) at org.elasticsearch.compute.operator.Driver.run(Driver.java:186) at org.elasticsearch.compute.operator.Driver$1.doRun(Driver.java:420) at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:27) at org.elasticsearch.compute.operator.DriverScheduler$1.doRun(DriverScheduler.java:57) at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:27) at org.elasticsearch.common.util.concurrent.TimedRunnable.doRun(TimedRunnable.java:35) at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:1067) at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:27) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1090) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:614) at java.lang.Thread.run(Thread.java:1474) Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.index.mapper.BlockSourceReader.toBytesRef(BlockSourceReader.java:473) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.index.mapper.BlockStoredFieldsReader$Id.read(BlockStoredFieldsReader.java:172) at org.elasticsearch.compute.lucene.read.ValuesFromSingleReader$RowStrideReaderWork.read(ValuesFromSingleReader.java:216) at org.elasticsearch.compute.lucene.read.ValuesFromSingleReader.loadFromRowStrideReaders(ValuesFromSingleReader.java:168) at org.elasticsearch.compute.lucene.read.ValuesFromSingleReader.loadFromSingleLeaf(ValuesFromSingleReader.java:112) at org.elasticsearch.compute.lucene.read.ValuesFromSingleReader.load(ValuesFromSingleReader.java:58) at org.elasticsearch.compute.lucene.read.ValuesReader.next(ValuesReader.java:38) at org.elasticsearch.compute.lucene.read.ValuesReader.next(ValuesReader.java:18) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator$AppendBlocksIterator.next(AbstractPageMappingToIteratorOperator.java:345) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator$AppendBlocksIterator.next(AbstractPageMappingToIteratorOperator.java:321) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator$RuntimeTrackingIterator.next(AbstractPageMappingToIteratorOperator.java:190) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator$RuntimeTrackingIterator.next(AbstractPageMappingToIteratorOperator.java:175) at org.elasticsearch.compute.operator.AbstractPageMappingToIteratorOperator.getOutput(AbstractPageMappingToIteratorOperator.java:149) at org.elasticsearch.compute.operator.Driver.runSingleLoopIteration(Driver.java:272) at org.elasticsearch.compute.operator.Driver.run(Driver.java:186) at org.elasticsearch.compute.operator.Driver$1.doRun(Driver.java:420) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:27) at org.elasticsearch.compute.operator.DriverScheduler$1.doRun(DriverScheduler.java:57) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:27) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.common.util.concurrent.TimedRunnable.doRun(TimedRunnable.java:35) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:1067) at org.elasticsearch.server@9.2.0-SNAPSHOT/org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:27) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1090) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:614) at java.base/java.lang.Thread.run(Thread.java:1474) Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more Suppressed: java.lang.NullPointerException: Cannot invoke "String.length()" because "v" is null ... 25 more