Question

由于JDK错误，我设法编写了一些在使用JDK 1.8.0_131进行编译时导致错误的代码。我只用几行代码就可以重现这个问题 - 但是我无法在项目中找到导致错误的模式的地方。

我的目标是弄清楚我的项目中的哪些代码导致了这个错误，并应用了一种解决方法。

问题＆amp;复制

问题在JDK-8074381 bug report中列出，只能在几行代码中复制。

public class Test {
  public interface Foo<L> extends Function<Number, String> {
    String apply(Number p);
  }
  private static final Foo CRASH = p -> "This will crash javac 1.8.0_131";
}

当使用非参数化的lambda而不是非参数化的内部类（根据我认为的语言规范应该都是有效的）时，问题就会出现。所以

private static final Foo INNER = new Foo<Object>() {
  @Override
  public String apply(final Number p) {
    return "This will not crash javac 1.8.0_131";
  }
};

工作正常。违规堆栈跟踪开始（为了您的理智而被截断）：

An exception has occurred in the compiler (1.8.0_131). 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.
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.<init>(LambdaToMethod.java:1770)
        at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor$LambdaTranslationContext.<init>(LambdaToMethod.java:1853)
        at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.analyzeLambda(LambdaToMethod.java:1337)
        at com.sun.tools.javac.comp.LambdaToMethod$LambdaAnalyzerPreprocessor.visitLambda(LambdaToMethod.java:1322)
        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)

鉴定

我知道this issue is fixed in JDK9，但是这个项目要求我使用JDK 8.

因此，我需要弄清楚这个项目中哪些代码产生错误，而不是更新到JDK9。这是我尝试过的。

我的第一个想法是检查发生此错误时正在编译的文件。但是，我无法弄清楚在遇到错误时如何检查正在编译的源文件。如果可以，那么这些信息会有所帮助。
我的第二个想法是对我的代码的所有进行正则表达式搜索，以查找扩展通用接口的任何类型参数化接口或接口。这些搜索都没有产生明显与产生代码问题匹配的代码 - 没有未使用的泛型（在示例中将interface Foo<L>更改为interface Foo将解决问题）。 因此，我认为对编译器内部实际导致此错误的内容有一个更微妙的理解可能有助于识别负责的代码，因为它可能会扩大我的搜索条件。（我也可能因为完全不同的问题而得到完全相同的堆栈跟踪错误，但这对我来说似乎不太可能，我不知道我从哪里开始在那，任何想法？）

我认为能够检查编译器日志或其他内容以检查弹出此问题时正在编译的内容是最有价值的。有什么想法吗？

感谢。

Answer 1

我注意到错误报告有一个.out文件，其中包含类信息。第一个参考点是遵循How to file a JDK Bug Report。

javac命令有-verbose选项。 我尝试使用错误报告的类，并编写了此输出：

javac Lib.java -verbose
[parsing started RegularFileObject[Lib.java]]
[parsing completed 26ms]
[search path for source files: .]
[search path for class files: /Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/resources.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/rt.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/sunrsasign.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/jsse.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/jce.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/charsets.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/jfr.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/classes,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/ext/cldrdata.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/ext/dnsns.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/ext/jaccess.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/ext/jfxrt.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/ext/localedata.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/ext/nashorn.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/ext/sunec.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar,/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/jre/lib/ext/zipfs.jar,/System/Library/Java/Extensions/AppleScriptEngine.jar,/System/Library/Java/Extensions/dns_sd.jar,/System/Library/Java/Extensions/j3daudio.jar,/System/Library/Java/Extensions/j3dcore.jar,/System/Library/Java/Extensions/j3dutils.jar,/System/Library/Java/Extensions/jai_codec.jar,/System/Library/Java/Extensions/jai_core.jar,/System/Library/Java/Extensions/mlibwrapper_jai.jar,/System/Library/Java/Extensions/MRJToolkit.jar,/System/Library/Java/Extensions/vecmath.jar,.]
[loading ZipFileIndexFileObject[/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/lib/ct.sym(META-INF/sym/rt.jar/java/util/List.class)]]
[loading ZipFileIndexFileObject[/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/lib/ct.sym(META-INF/sym/rt.jar/java/util/function/Predicate.class)]]
[loading ZipFileIndexFileObject[/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Object.class)]]
[loading ZipFileIndexFileObject[/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/lib/ct.sym(META-INF/sym/rt.jar/java/lang/Class.class)]]
[loading ZipFileIndexFileObject[/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/lib/ct.sym(META-INF/sym/rt.jar/java/lang/SuppressWarnings.class)]]
[loading ZipFileIndexFileObject[/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/lib/ct.sym(META-INF/sym/rt.jar/java/lang/annotation/Annotation.class)]]
[loading ZipFileIndexFileObject[/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/lib/ct.sym(META-INF/sym/rt.jar/java/lang/String.class)]]
[loading ZipFileIndexFileObject[/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/lib/ct.sym(META-INF/sym/rt.jar/java/lang/annotation/Target.class)]]
[loading ZipFileIndexFileObject[/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/lib/ct.sym(META-INF/sym/rt.jar/java/lang/annotation/ElementType.class)]]
[loading ZipFileIndexFileObject[/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/lib/ct.sym(META-INF/sym/rt.jar/java/lang/annotation/Retention.class)]]
[loading ZipFileIndexFileObject[/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/lib/ct.sym(META-INF/sym/rt.jar/java/lang/annotation/RetentionPolicy.class)]]
[checking Lib]
[loading ZipFileIndexFileObject[/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/lib/ct.sym(META-INF/sym/rt.jar/java/io/Serializable.class)]]
[loading ZipFileIndexFileObject[/Library/Java/JavaVirtualMachines/jdk1.8.0_92.jdk/Contents/Home/lib/ct.sym(META-INF/sym/rt.jar/java/lang/AutoCloseable.class)]]
An exception has occurred in the compiler (1.8.0_92). 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.
java.lang.AssertionError

鉴于它打印出检查Lib 并在编译时失败，使其成为查找源文件的有用工具。因此，您应该能够以详细模式编译项目，并且在第一次出现此错误时会失败（我认为）

调试内部编译器错误（Java）以查找有问题的源代码

问题＆amp;复制

鉴定

1 个答案: