android启动问题。不支持的班级文件主要版本57

Question

我已经按照mac android入门，但是当我运行android时，它失败并出现以下错误。我试图在线找到答案，但似乎找不到解决方案。香港专业教育学院确保我在机器上安装了正确的Java JDK8，但即时通讯仍然收到此错误。任何意见是极大的赞赏！

> startup failed:
  General error during semantic analysis: Unsupported class file major version 57

  java.lang.IllegalArgumentException: Unsupported class file major version 57
        at groovyjarjarasm.asm.ClassReader.<init>(ClassReader.java:184)
        at groovyjarjarasm.asm.ClassReader.<init>(ClassReader.java:166)
        at groovyjarjarasm.asm.ClassReader.<init>(ClassReader.java:152)
        at groovyjarjarasm.asm.ClassReader.<init>(ClassReader.java:273)
        at org.codehaus.groovy.ast.decompiled.AsmDecompiler.parseClass(AsmDecompiler.java:81)
        at org.codehaus.groovy.control.ClassNodeResolver.findDecompiled(ClassNodeResolver.java:254)
        at org.codehaus.groovy.control.ClassNodeResolver.tryAsLoaderClassOrScript(ClassNodeResolver.java:192)
        at org.codehaus.groovy.control.ClassNodeResolver.findClassNode(ClassNodeResolver.java:172)
        at org.codehaus.groovy.control.ClassNodeResolver.resolveName(ClassNodeResolver.java:128)
        at org.codehaus.groovy.ast.decompiled.AsmReferenceResolver.resolveClassNullable(AsmReferenceResolver.java:59)
        at org.codehaus.groovy.ast.decompiled.AsmReferenceResolver.resolveClass(AsmReferenceResolver.java:46)
        at org.codehaus.groovy.ast.decompiled.AsmReferenceResolver.resolveNonArrayType(AsmReferenceResolver.java:81)
        at org.codehaus.groovy.ast.decompiled.AsmReferenceResolver.resolveType(AsmReferenceResolver.java:72)
        at org.codehaus.groovy.ast.decompiled.MemberSignatureParser.createMethodNode(MemberSignatureParser.java:55)
        at org.codehaus.groovy.ast.decompiled.DecompiledClassNode.lazyInitMembers(DecompiledClassNode.java:195)
        at org.codehaus.groovy.ast.decompiled.DecompiledClassNode.getDeclaredMethods(DecompiledClassNode.java:121)
        at org.codehaus.groovy.ast.ClassNode.getMethods(ClassNode.java:912)
        at org.codehaus.groovy.ast.ClassNode.tryFindPossibleMethod(ClassNode.java:1280)
        at org.codehaus.groovy.control.StaticImportVisitor.transformMethodCallExpression(StaticImportVisitor.java:252)
        at org.codehaus.groovy.control.StaticImportVisitor.transform(StaticImportVisitor.java:112)
        at org.codehaus.groovy.ast.ClassCodeExpressionTransformer.visitExpressionStatement(ClassCodeExpressionTransformer.java:144)
        at org.codehaus.groovy.ast.stmt.ExpressionStatement.visit(ExpressionStatement.java:42)
        at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClassCodeContainer(ClassCodeVisitorSupport.java:110)
        at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitConstructorOrMethod(ClassCodeVisitorSupport.java:121)
        at org.codehaus.groovy.ast.ClassCodeExpressionTransformer.visitConstructorOrMethod(ClassCodeExpressionTransformer.java:55)
        at org.codehaus.groovy.control.StaticImportVisitor.visitConstructorOrMethod(StaticImportVisitor.java:88)
        at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitConstructor(ClassCodeVisitorSupport.java:128)
        at org.codehaus.groovy.ast.ClassNode.visitContents(ClassNode.java:1099)
        at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClass(ClassCodeVisitorSupport.java:54)
        at org.codehaus.groovy.control.StaticImportVisitor.visitClass(StaticImportVisitor.java:82)
        at org.codehaus.groovy.control.CompilationUnit$14.call(CompilationUnit.java:717)
        at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:1095)
        at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:649)
        at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:627)
        at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:604)
        at groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:390)
        at groovy.lang.GroovyClassLoader.access$300(GroovyClassLoader.java:89)
        at groovy.lang.GroovyClassLoader$5.provide(GroovyClassLoader.java:330)
        at groovy.lang.GroovyClassLoader$5.provide(GroovyClassLoader.java:327)
        at org.codehaus.groovy.runtime.memoize.ConcurrentCommonCache.getAndPut(ConcurrentCommonCache.java:147)
        at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:325)
        at org.gradle.groovy.scripts.internal.DefaultScriptCompilationHandler.compileScript(DefaultScriptCompilationHandler.java:133)
        at org.gradle.groovy.scripts.internal.DefaultScriptCompilationHandler.compileToDir(DefaultScriptCompilationHandler.java:93)
        at org.gradle.groovy.scripts.internal.BuildOperationBackedScriptCompilationHandler$2.run(BuildOperationBackedScriptCompilationHandler.java:54)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:402)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:394)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:92)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.groovy.scripts.internal.BuildOperationBackedScriptCompilationHandler.compileToDir(BuildOperationBackedScriptCompilationHandler.java:51)

开发环境：Mac OS X 10.15

Answer 1

我在运行时遇到同样的问题gradle build。根据谷歌和github的搜索。我发现gradle现在的版本（5.xx）不支持jdk 13。最后6.x版本支持了，但是还没有发布，所以只好把jdk版本降级到12.x。

将 java 降级到 12 https://www.jverdeyen.be/mac/downgrade-brew-cask-application/

brew cask uninstall adoptopenjdk # uninstall jdk version 13.x
brew tap AdoptOpenJDK/openjdk
brew cask install adoptopenjdk12

Answer 2

为了解决这个错误，我转到了文件目录 atandroid/gradle/wrapper/gradle-wrapper.properties并修改了distributionUrl设置为，gradle-5.5而不是我使用的gradle-6.0. 出于某种原因，它无法识别 6.2 发行版，即使这是我目前使用的 gradle 版本。我认为这应该与版本相对应，但显然不是。

代替：

distributionUrl=https\://services.gradle.org/distributions/gradle-5.5-all.zip

用：

distributionUrl=https\://services.gradle.org/distributions/gradle-6.0-all.zip

Answer 3

这是因为您的JDK版本不支持您项目的Gradle版本。jdk-13 不支持 Gradle 5。最佳解决方案是更改 gradle-wrapper.properties 中的 gradle 版本。您可以设置任何高于6的gradle版本，

或者

进入（在 Mac 上）首选项>构建、执行、部署>Gradle

(Windows) 文件>设置>构建、执行、部署>Gradle

然后在 Gradle 部分下您可以选择 Gradle 和 Java，如下图所示

您也可以单独安装gradle并使用指定路径。不过，我建议您使用 gradle-wrapper.properties 文件和 Gradle JVM 到内部 JDK 或项目 JVM。这样您就不必卸载 JDK 13 并安装降级的 JDK11 或 JDK12

如果您在 Android Studio 中找不到此选项，请降级您的 JDK 或使用第一个选项。