got error when run ant for lucene source code - lucene

Question

I forked the lucene-solr from https://github.com/apache/lucene-solr.git.
Then run ant in the directory and got the following error.
alexkkk#alexkkk-host:lucene-solr/ (master) $ ant idea [16:44:41]
Buildfile: /Users/alexkkk/Projects/lucene-solr/build.xml
BUILD FAILED
/Users/alexkkk/Projects/lucene-solr/build.xml:21: The following error occurred while executing this line:
/Users/alexkkk/Projects/lucene-solr/lucene/common-build.xml:623: java.lang.NullPointerException
at java.util.Arrays.stream(Arrays.java:5004)
at java.util.stream.Stream.of(Stream.java:1000)
at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:267)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:545)
at java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260)
at java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:438)
at org.apache.tools.ant.util.ChainedMapper.lambda$mapFileName$1(ChainedMapper.java:36)
at java.util.stream.ReduceOps$1ReducingSink.accept(ReduceOps.java:80)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.reduce(ReferencePipeline.java:484)
at org.apache.tools.ant.util.ChainedMapper.mapFileName(ChainedMapper.java:35)
at org.apache.tools.ant.util.CompositeMapper.lambda$mapFileName$0(CompositeMapper.java:32)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:545)
at java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260)
at java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:438)
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 sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
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 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.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

Answer 1

As mentioned in this thread. You have to downgrade your ant from version 1.10.2 to 1.10.1 or 1.9.
If you use Mac and use homebrew to install your ant. You can install ant 1.9.
brew install ant#1.9
and then unlink version 1.10.2 and link version 1.9.
brew unlink ant
brew link --force ant#1.9
With ant 1.9, you should be able to compile Lucene.