Java version does not support new versioning schema introduced in Java 9 about knopflerfish.org HOT 10 CLOSED

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In Java 9 the "java.specification.version" property has been changed so that the former major version "1" as in "1.9" has been dropped and former minor version has become major version, e.g. "9"

Knopflerfish makes checks to verify the major version is "1"

You can go around the problem for now by setting:
Forg.osgi.framework.executionenvironment="JavaSE-9"

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Unfortunately I can not use this workaround because the Version constructor throws an exception given string "9.-1" which is currently returned as java version property value.

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Which OS and version of Java9 are you using?

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Windows 10
C:\Program Files\Java\jdk-9\bin>java -version
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+143)
Java HotSpot(TM) 64-Bit Server VM (build 9-ea+143, mixed mode)

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Strange, I don't understand where the "9.-1" string comes from.

What happens if you start like this:
java -jar framework.jar -Forg.osgi.framework.executionenvironment="JavaSE-9" -init

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I have investigated what happens. It turned out that problems are in class FWProps.

System.getProperty("java.specification.version") returns "9" .
System.getProperty("java.version") would return "9-ea", but it is not relevant.
Therefore blocks

          if (startPos < endPos) {
            javaVersionMinor = Integer.parseInt(javaVersion.substring(startPos, endPos));
            startPos = endPos + 1;
            endPos = startPos;
            while (endPos < max && Character.isDigit(javaVersion.charAt(endPos))) {
              endPos++;
            }
            if (startPos < endPos) {
              javaVersionMicro = Integer.parseInt(javaVersion.substring(startPos, endPos));
            }
          }

are ignored,
javaVersionMajor is set to 9, javaVersionMinor and javaVersionMicro remain equal to -1.
and code

    setPropertyDefault(SYSTEM_PACKAGES_VERSION_PROP, Integer.toString(javaVersionMajor) + "."
        + javaVersionMinor);

sets this property to "9.-1" . It causes the exception in constructor of Version which I mentioned before.

Also in block

    if (!props.containsKey(FRAMEWORK_EXECUTIONENVIRONMENT)) {
      final StringBuffer ee = new StringBuffer();
      // Always allow ee minimum
      ee.append("OSGi/Minimum-1.0");
      ee.append(",OSGi/Minimum-1.1");
      ee.append(",OSGi/Minimum-1.2");
      // Set up the default ExecutionEnvironment
      if (1 == javaVersionMajor) {
        for (int i = javaVersionMinor; i > 1; i--) {
          ee.append((i > 5) ? ",JavaSE-1." : ",J2SE-1.");
          ee.append(i);
        }
      }
      props.put(FRAMEWORK_EXECUTIONENVIRONMENT, ee.toString());
    }

for-loop is not executed and in method SystemBundle.initSystemBundle() provideCapabilityString becomes 'osgi.ee;osgi.ee=OSGi/Minimum;version:List="1.0.0,1.1.0,1.2.0"'

As a workaround I can set properties

-Forg.knopflerfish.framework.system.packages.version=1.7.0
-Forg.osgi.framework.system.capabilities=osgi.ee;osgi.ee=JavaSE;version:List<Version>="1.2.0,1.3.0,1.4.0,1.5.0,1.6.0,1.7.0",osgi.ee;osgi.ee=OSGi/Minimum;version:List<Version>="1.0.0,1.1.0,1.2.0"

because I actually need JavaSE 7 only .
Well, after I force these property values it turns out that Java9 is still full of bugs, but is another issue.

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Fixed in framework 8.0.2. Available in https://bintray.com/knopflerfish/master/download_file?file_path=distrib_6.0.0.snapshot-1701031635-master%2Fknopflerfish_osgi_sdk_6.0.0.snapshot-1701031635-master.jar

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How can the fixed version be used as maven / gradle dependency?

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Sorry for the late reply.

The fix is in the KF 6.1 release and the framework and bundles are included in the KF 6.1 maven release repository.

All the maven artifacts are listed here
http://www.knopflerfish.org/releases/6.1.0/maven2/org/knopflerfish/kf6/KF-6.1.0_dependencyManagement.xml

The maven2 repo is browsable at:
http://www.knopflerfish.org/releases/6.1.0/maven2/org/knopflerfish/kf6/

The KF 6.1 bundles can

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Thank you.
We still have time before java 9 release.
And with this version it works fine.

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