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java.lang.AssertionError: 	at com.sun.tools.javac.util.Assert.error(Assert.java:126)	at com.sun.tools.javac.util.Assert.check(Assert.java:45)	at com.sun.tools.javac.code.Types.functionalInterfaceBridges(Types.java:659)	at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor$TranslationContext.(LambdaToMethod.java:1695)	at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor$LambdaTranslationContext.(LambdaToMethod.java:1778)	at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.analyzeLambda(LambdaToMethod.java:1278)	at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.visitLambda(LambdaToMethod.java:1263)	at com.sun.tools.javac.tree.JCTree$JCLambda.accept(JCTree.java:1624)	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.sun.tools.javac.tree.TreeTranslator.visitVarDef(TreeTranslator.java:153)	at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.visitVarDef(LambdaToMethod.java:1444)	at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:852)	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)	at com.sun.tools.javac.tree.TreeTranslator.visitBlock(TreeTranslator.java:162)	at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.visitBlock(LambdaToMethod.java:1172)	at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909)	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)	at com.sun.tools.javac.tree.TreeTranslator.visitBlock(TreeTranslator.java:162)	at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.visitBlock(LambdaToMethod.java:1172)	at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909)	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.sun.tools.javac.tree.TreeTranslator.visitMethodDef(TreeTranslator.java:145)	at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.visitMethodDef(LambdaToMethod.java:1302)	at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778)	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)	at com.sun.tools.javac.tree.TreeTranslator.visitClassDef(TreeTranslator.java:134)	at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.visitClassDef(LambdaToMethod.java:1211)	at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:693)	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.analyzeAndPreprocessClass(LambdaToMethod.java:1162)	at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.access$300(LambdaToMethod.java:1119)	at com.sun.tools.javac.comp.LambdaToMethod.visitClassDef(LambdaToMethod.java:232)	at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:693)	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.sun.tools.javac.comp.LambdaToMethod.translate(LambdaToMethod.java:197)	at com.sun.tools.javac.comp.LambdaToMethod.translate(LambdaToMethod.java:190)	at com.sun.tools.javac.comp.LambdaToMethod.translateTopLevelClass(LambdaToMethod.java:217)	at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1493)	at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1356)	at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:901)	at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:860)	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:101)	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)	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:84)	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)	at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)	at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)	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.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)