https://bz.apache.org/bugzilla/show_bug.cgi?id=62086
Bug ID: 62086
Summary: NullPointerException in ChainedMapper.mapFileName when
building Lucene with Ant 1.10.2
Product: Ant
Version: 1.10.2
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Core
Assignee: notifications@ant.apache.org
Reporter: jpou...@gmail.com
Target Milestone: ---
Ant 1.10.2 fails to build Lucene/Solr while 1.10.1 succeeds. Here is what the
error looks like:
BUILD FAILED
/home/jpountz/src/lucene-solr/build.xml:21: The following error occurred while
executing this line:
/home/jpountz/src/lucene-solr/lucene/common-build.xml:624:
java.lang.NullPointerException
at java.base/java.util.Arrays.stream(Arrays.java:5610)
at java.base/java.util.stream.Stream.of(Stream.java:1187)
at
java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:269)
at
java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at
java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
at
java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at
java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at
java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:550)
at
java.base/java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260)
at
java.base/java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:450)
at
org.apache.tools.ant.util.ChainedMapper.lambda$mapFileName$1(ChainedMapper.java:36)
at
java.base/java.util.stream.ReduceOps$1ReducingSink.accept(ReduceOps.java:80)
at
java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1494)
at
java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at
java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at
java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
at
java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at
java.base/java.util.stream.ReferencePipeline.reduce(ReferencePipeline.java:496)
at
org.apache.tools.ant.util.ChainedMapper.mapFileName(ChainedMapper.java:35)
at
org.apache.tools.ant.util.CompositeMapper.lambda$mapFileName$0(CompositeMapper.java:32)
at
java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at
java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
at
java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1494)
at
java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at
java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at
java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:550)
at
java.base/java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260)
at
java.base/java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:450)
at
org.apache.tools.ant.util.CompositeMapper.mapFileName(CompositeMapper.java:33)
at
org.apache.tools.ant.taskdefs.PathConvert.execute(PathConvert.java:363)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at jdk.internal.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at
org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:346)
at org.apache.tools.ant.Target.execute(Target.java:448)
at
org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:172)
at
org.apache.tools.ant.taskdefs.ImportTask.importResource(ImportTask.java:221)
at
org.apache.tools.ant.taskdefs.ImportTask.execute(ImportTask.java:165)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at
org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:346)
at org.apache.tools.ant.Target.execute(Target.java:448)
at
org.apache.tools.ant.helper.ProjectHelper2.parse(ProjectHelper2.java:183)
at
org.apache.tools.ant.ProjectHelper.configureProject(ProjectHelper.java:93)
at org.apache.tools.ant.Main.runBuild(Main.java:824)
at org.apache.tools.ant.Main.startAnt(Main.java:228)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:283)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:101)
Total time: 0 seconds
This is due to the fact that ChainedMapper.mapFileName was refactored to use
streams rather than an explicit for loop but some null checks haven't been
migrated.
Specifically, one of the sub mappers is a GlobPatternMapper, which sometimes
returns null. This is problematic since ChainedMapper.mapFileNamp calls
Arrays.stream on the result array without checking for nulls.
Replacing ".map(m::mapFileName).flatMap(Stream::of).toArray(String[]::new)"
with
".map(m::mapFileName).filter(Objects::nonNull).flatMap(Stream::of).toArray(String[]::new)"
seems to fix the issue but I don't know Ant well enough to know whether this is
the appropriate fix.
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