ClassNotFoundException神奇地未选中

Question

public final class Worker
implements Runnable {

    @Override
    public void run() {
        try {
            _run();
        }
        catch (RuntimeException e) {
            // Cleanup carefully
        }
    }

    private void _run() {
        // do work here
    }
}

stacktrace示例（已消毒）：

Caused by: java.lang.ClassNotFoundException: xyz
        at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 10 more
Caused by: java.util.zip.ZipException: error reading zip file
        at java.util.zip.ZipFile.read(Native Method)
        at java.util.zip.ZipFile.access$1400(ZipFile.java:61)
        at java.util.zip.ZipFile$ZipFileInputStream.read(ZipFile.java:717)
        at java.util.zip.ZipFile$ZipFileInflaterInputStream.fill(ZipFile.java:420)
        at java.util.zip.InflaterInputStream.read(InflaterInputStream.java:158)
        at java.util.jar.Manifest$FastInputStream.fill(Manifest.java:441)
        at java.util.jar.Manifest$FastInputStream.readLine(Manifest.java:375)
        at java.util.jar.Manifest$FastInputStream.readLine(Manifest.java:409)
        at java.util.jar.Attributes.read(Attributes.java:376)
        at java.util.jar.Manifest.read(Manifest.java:199)
        at java.util.jar.Manifest.<init>(Manifest.java:69)
        at java.util.jar.JarFile.getManifestFromReference(JarFile.java:199)
        at java.util.jar.JarFile.getManifest(JarFile.java:180)
        at sun.misc.URLClassPath$JarLoader$2.getManifest(URLClassPath.java:780)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:422)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:367)
        ... 16 more

Answer 1

为什么此异常不是RuntimeException？

这是java.lang.ClassNotFoundException的层次结构

java.lang.Object
 java.lang.Throwable
  java.lang.Exception
   java.lang.ReflectiveOperationException
     java.lang.ClassNotFoundException

正如您所看到的，它没有以任何方式扩展具有以下层次结构的RuntimeException

java.lang.Object
 java.lang.Throwable
  java.lang.Exception
   java.lang.RuntimeException