test/hotspot/jtreg/runtime/StackTrace/HiddenFrameTest.java

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/**
 * @test
 * @bug 8216977
 * @summary Test null source file and negative line number from hidden frame produces correct output.
 * @library /test/lib
 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+ShowHiddenFrames HiddenFrameTest visible
 * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:-ShowHiddenFrames HiddenFrameTest hidden
 */

import jdk.test.lib.Asserts;

public class HiddenFrameTest {

    @FunctionalInterface
    private static interface SomeFunctionalInterface {
        String someMethod(String a, String b);
    }

    static void assertContains(String expected, String actual, Exception e, boolean framesAreHidden) throws Exception {
        if (!framesAreHidden && !actual.contains(expected)) {
            throw new RuntimeException("Expected: " + expected + "; Actual: " + actual, e);
        } else if (framesAreHidden && actual.contains(expected)) {
            throw new RuntimeException("Unexpected: " + expected + "; Actual: " + actual, e);
        }
    }

    static void checkException(Exception e, boolean framesAreHidden) throws Exception {
        StackTraceElement[] fs = e.getStackTrace();

        if (fs.length < 2) {
            throw new RuntimeException("Exception should have at least two frames", e);
        }

        assertContains("someMethod(Unknown Source)", fs[0].toString(), e, framesAreHidden);
    }

    public static void main(String[] args) throws Exception {
        boolean framesAreHidden = false;
        if (args.length > 0) {
            String arg = args[0];
            if (arg.equals("hidden")) framesAreHidden = true;
        }

        try {
            final SomeFunctionalInterface concatter = String::concat;
            final String nullString = null;
            if (concatter != null) {
                // This throws NPE from the lambda expression which is a hidden frame
                concatter.someMethod(nullString, "validString");
            }
        } catch (NullPointerException e) {
            e.printStackTrace();
            checkException(e, framesAreHidden);
        }
    }
}