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java.lang.NullPointerException: 	at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.trackable(Flow.java:1476)	at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.visitVarDef(Flow.java:1801)	at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitVarDef(Flow.java:2516)	at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:846)	at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)	at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:389)	at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.scan(Flow.java:1367)	at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.visitLambda(Flow.java:2225)	at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1618)	at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)	at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:389)	at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.scan(Flow.java:1367)	at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.scanExpr(Flow.java:1596)	at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.scanExprs(Flow.java:1608)	at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.visitApply(Flow.java:2205)	at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1459)	at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)	at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:389)	at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.scan(Flow.java:1367)	at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.analyzeTree(Flow.java:2370)	at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.analyzeTree(Flow.java:2353)	at com.sun.tools.javac.comp.Flow.analyzeLambdaThrownTypes(Flow.java:242)	at com.sun.tools.javac.comp.Attr.visitLambda(Attr.java:2400)	at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1618)	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:596)	at com.sun.tools.javac.comp.DeferredAttr$2.complete(DeferredAttr.java:270)	at com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:231)	at com.sun.tools.javac.comp.DeferredAttr$DeferredType.check(DeferredAttr.java:218)	at com.sun.tools.javac.comp.Resolve$MethodResultInfo.check(Resolve.java:976)	at com.sun.tools.javac.comp.Resolve$4.checkArg(Resolve.java:822)	at com.sun.tools.javac.comp.Resolve$AbstractMethodCheck.argumentsAcceptable(Resolve.java:733)	at com.sun.tools.javac.comp.Resolve$4.argumentsAcceptable(Resolve.java:831)	at com.sun.tools.javac.comp.Infer.instantiateMethod(Infer.java:162)	at com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:566)	at com.sun.tools.javac.comp.Resolve.checkMethod(Resolve.java:603)	at com.sun.tools.javac.comp.Attr.checkMethod(Attr.java:3777)	at com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:3583)	at com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3490)	at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3469)	at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3456)	at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3338)	at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1891)	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:596)	at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1828)	at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1459)	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:596)	at com.sun.tools.javac.comp.Attr.visitReturn(Attr.java:1689)	at com.sun.tools.javac.tree.JCTree$JCReturn.accept(JCTree.java:1378)	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:596)	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:665)	at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:681)	at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1127)	at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:903)	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:596)	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:665)	at com.sun.tools.javac.comp.Attr.visitTry(Attr.java:1357)	at com.sun.tools.javac.tree.JCTree$JCTry.accept(JCTree.java:1167)	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:596)	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:665)	at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:681)	at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1127)	at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:903)	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:596)	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:665)	at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1020)	at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:772)	at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:596)	at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:665)	at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4305)	at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4215)	at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4149)	at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4124)	at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1251)	at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:904)	at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:863)	at com.sun.tools.javac.main.Main.compile(Main.java:523)	at com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:129)	at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:138)	at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess(JavaxToolsCompiler.java:126)	at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile(JavacCompiler.java:169)	at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:785)	at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:129)	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:132)	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208)	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:120)	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:347)	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:154)	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:582)	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:214)	at org.apache.maven.cli.MavenCli.main(MavenCli.java:158)	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:483)	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)