编译
直接在lucene-solr目录下执行：ant compile
到lucene-solr/lucene目录下执行：ant compile
执行ant ivy-bootstrap， 提示成功，没有报错。
继续执行 ant compile，编译成功。
看了下build.xml帮助， 可以通过ant idea命令，报错如下
alexkkk@alexkkk-host:lucene-solr/ (master) $ ant idea [16:44:41] Buildfile: /Users/alexkkk/Projects/lucene-solr/build.xmlBUILD 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)
不知道原因在哪，后来stackoverflow上提问，才知道是ant版本不对，最新的ant1.10.2有bug :-(
https://stackoverflow.com/questions/49295019/got-error-when-run-ant-for-lucene-source-code/49356886#49356886
按照说明，执行下面的命令，解决问题
brew install ant@1.9
brew unlink ant
brew link --force ant@1.9
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