Running the program "foo" below causes the following:

java -classic -Xcheck:jni foo

FATAL ERROR in native method: JNI received a null string
        at java.util.zip.ZipFile.open(Native Method)
        at java.util.zip.ZipFile.<init>(ZipFile.java:69)
        at foo.main(foo.java:7)

The native method ends up calling jni_GetStringLength with a null argument, which causes a VM crash if -Xcheck:jni is not enabled.

See bug #4219367 for a more complete list of ZipFile constructor tests.

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import java.util.zip.*;

public class foo {
  public static void main(String[] args) {
    try {
      String name = null;
      ZipFile zf = new ZipFile(name);
    } catch (Exception e) {
      if ( e instanceof NullPointerException ) {
        System.out.println ("Expected NullPointerException thrown");
        return;
      } else {
        System.out.println ("Exception thrown, but not the expected NullPointerException");
        e.printStackTrace();
        return;
      }
    }
    System.out.println ("NullPointerException was not thrown");
  }
}