Getting the following error on two different Ubuntu 16.04 build machines

2017-08-21 zm-qa build failure

compile:
    [javac] Compiling 35 source files to /home/zimbra/zcs/zm-qa/build/classes
    [javac] An exception has occurred in the compiler (1.8.0_92-zimbra). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com)
 after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program and the following diagnostic in your report. Thank you.
    [javac] java.lang.NullPointerException
    [javac]     at com.sun.tools.javac.code.Lint.augment(Lint.java:71)
    [javac]     at com.sun.tools.javac.comp.Flow$AliveAnalyzer.visitVarDef(Flow.java:530)
    [javac]     at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:852)
    [javac]     at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
    [javac]     at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:404)
    [javac]     at com.sun.tools.javac.comp.Flow$AliveAnalyzer.scanStat(Flow.java:448)
    [javac]     at com.sun.tools.javac.comp.Flow$AliveAnalyzer.scanStats(Flow.java:456)
    [javac]     at com.sun.tools.javac.comp.Flow$AliveAnalyzer.visitBlock(Flow.java:540)
    [javac]     at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909)
    [javac]     at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
    [javac]     at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:404)
    [javac]     at com.sun.tools.javac.comp.Flow$AliveAnalyzer.scanStat(Flow.java:448)
    [javac]     at com.sun.tools.javac.comp.Flow$AliveAnalyzer.visitMethodDef(Flow.java:510)
    [javac]     at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778)
    [javac]     at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
    [javac]     at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:404)
    [javac]     at com.sun.tools.javac.comp.Flow$AliveAnalyzer.visitClassDef(Flow.java:490)
    [javac]     at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:693)
    [javac]     at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
    [javac]     at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:404)
    [javac]     at com.sun.tools.javac.comp.Flow$AliveAnalyzer.analyzeTree(Flow.java:761)
    [javac]     at com.sun.tools.javac.comp.Flow$AliveAnalyzer.analyzeTree(Flow.java:753)
    [javac]     at com.sun.tools.javac.comp.Flow.analyzeTree(Flow.java:210)
    [javac]     at com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1327)
    [javac]     at com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1296)
    [javac]     at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:901)
    [javac]     at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:860)
    [javac]     at com.sun.tools.javac.main.Main.compile(Main.java:523)
    [javac]     at com.sun.tools.javac.main.Main.compile(Main.java:381)
    [javac]     at com.sun.tools.javac.main.Main.compile(Main.java:370)
    [javac]     at com.sun.tools.javac.main.Main.compile(Main.java:361)
    [javac]     at com.sun.tools.javac.Main.compile(Main.java:56)
    [javac]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    [javac]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    [javac]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        [javac]     at java.lang.reflect.Method.invoke(Method.java:498)
    [javac]     at org.apache.tools.ant.taskdefs.compilers.Javac13.execute(Javac13.java:57)
    [javac]     at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1160)
    [javac]     at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:936)
    [javac]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
    [javac]     at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
    [javac]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [javac]     at java.lang.reflect.Method.invoke(Method.java:498)
    [javac]     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    [javac]     at org.apache.tools.ant.Task.perform(Task.java:348)
    [javac]     at org.apache.tools.ant.Target.execute(Target.java:435)
    [javac]     at org.apache.tools.ant.Target.performTasks(Target.java:456)
    [javac]     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405)
    [javac]     at org.apache.tools.ant.Project.executeTarget(Project.java:1376)
    [javac]     at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
    [javac]     at org.apache.tools.ant.Project.executeTargets(Project.java:1260)
    [javac]     at org.apache.tools.ant.Main.runBuild(Main.java:853)
    [javac]     at org.apache.tools.ant.Main.startAnt(Main.java:235)
    [javac]     at org.apache.tools.ant.launch.Launcher.run(Launcher.java:285)
    [javac]     at org.apache.tools.ant.launch.Launcher.main(Launcher.java:112)

BUILD FAILED
/home/zimbra/zcs/zm-qa/build.xml:25: Compile failed; see the compiler error output for details.