Graal: Example.class.getResourceAsStream("example.properties") returns null

Created on 25 Oct 2020 · 2Comments · Source: oracle/graal

Hello,

I tried to create native image with https://github.com/mangstadt/biweekly library. I have a problem, connected with resources.

The block of code is:

public final class Biweekly {
    static {
        InputStream in = null;
        try {
            in = Biweekly.class.getResourceAsStream("biweekly.properties");
            Properties props = new Properties();
            props.load(in);
            // ....
        } catch (IOException e) {
            throw new RuntimeException(e);
        } finally {
            IOUtils.closeQuietly(in);
        }
    }
    // .......
}

Steps to reproduce:

Download the jars of the lib: https://repo1.maven.org/maven2/net/sf/biweekly/biweekly/0.6.4/biweekly-0.6.4.jar and https://repo1.maven.org/maven2/com/github/mangstadt/vinnie/2.0.2/vinnie-2.0.2.jar
The Example class:

import biweekly.Biweekly;
import biweekly.ICalendar;
import biweekly.component.VEvent;

public class Main {

    public static void main(String[] args) {
        String str =
                "BEGIN:VCALENDAR\r\n" +
                        "VERSION:2.0\r\n" +
                        "PRODID:-//Microsoft Corporation//Outlook 14.0 MIMEDIR//EN\r\n" +
                        "BEGIN:VEVENT\r\n" +
                        "UID:0123\r\n" +
                        "DTSTAMP:20130601T080000Z\r\n" +
                        "SUMMARY;LANGUAGE=en-us:Team Meeting\r\n" +
                        "DTSTART:20130610T120000Z\r\n" +
                        "DURATION:PT1H\r\n" +
                        "RRULE:FREQ=WEEKLY;INTERVAL=2\r\n" +
                        "END:VEVENT\r\n" +
                        "END:VCALENDAR\r\n";

        ICalendar ical = Biweekly.parse(str).first();

        VEvent event = ical.getEvents().get(0);
        String summary = event.getSummary().getValue();
        System.out.println(summary);
    }
}

Build a native image:

javac -cp /folder/src:/folder/src/biweekly-0.6.4.jar:/folder/src/vinnie-2.0.2.jar Main.java

native-image -cp /folder/src:/folder/src/biweekly-0.6.4.jar:/folder/src/vinnie-2.0.2.jar --no-fallback Main

Build logs:

[main:1018]    classlist:   2,211.90 ms,  0.96 GB
[main:1018]        (cap):   2,183.62 ms,  0.96 GB
[main:1018]        setup:   4,017.10 ms,  0.96 GB
[main:1018]     (clinit):     338.99 ms,  2.28 GB
[main:1018]   (typeflow):  12,889.48 ms,  2.28 GB
[main:1018]    (objects):  14,835.50 ms,  2.28 GB
[main:1018]   (features):   1,722.08 ms,  2.28 GB
[main:1018]     analysis:  30,291.73 ms,  2.28 GB
[main:1018]     universe:     841.77 ms,  2.28 GB
[main:1018]      (parse):   3,170.74 ms,  2.29 GB
[main:1018]     (inline):   2,366.88 ms,  3.18 GB
[main:1018]    (compile):  19,990.10 ms,  4.09 GB
[main:1018]      compile:  26,738.77 ms,  4.09 GB
[main:1018]        image:   2,030.61 ms,  4.09 GB
[main:1018]        write:   1,044.76 ms,  4.09 GB
[main:1018]      [total]:  67,475.42 ms,  4.09 GB

Run log:

src$ ./main
Exception in thread "main" java.lang.ExceptionInInitializerError
        at com.oracle.svm.core.classinitialization.ClassInitializationInfo.initialize(ClassInitializationInfo.java:291)
        at Main.main(Main.java:23)
Caused by: java.lang.NullPointerException: inStream parameter is null
        at java.util.Objects.requireNonNull(Objects.java:246)
        at java.util.Properties.load(Properties.java:403)
        at biweekly.Biweekly.<clinit>(Biweekly.java:245)
        at com.oracle.svm.core.classinitialization.ClassInitializationInfo.invokeClassInitializer(ClassInitializationInfo.java:351)
        at com.oracle.svm.core.classinitialization.ClassInitializationInfo.initialize(ClassInitializationInfo.java:271)
        ... 1 more

My version is:

$ java --version
openjdk 11.0.8 2020-07-14
OpenJDK Runtime Environment GraalVM CE 20.2.0 (build 11.0.8+10-jvmci-20.2-b03)
OpenJDK 64-Bit Server VM GraalVM CE 20.2.0 (build 11.0.8+10-jvmci-20.2-b03, mixed mode, sharing)

bug native-image

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