Create mr.jar file:

1. On the Windows Server 2003 R2 system running Java 1.8 131:

  - VersionDependent class that displays "Java 8 or earlier version!"

    C:\temp\mrtest\src\com\emc\demo\VersionDependent.java

  - Compile it from C:\temp\mrtest\src\com\emc\demo:

    "c:\Program Files\Java\jdk1.8.0_131\bin\javac.exe" -d C:\temp\mrtest\out-mr\java8   VersionDependent.java

    This creates:

      C:\temp\mrtest\out-mr\java8\com\emc\demo\VersionDependent.class

 

2. On the Windows 10 system running Java 10 ea:

C:\Users\cardal>java -version

java version "10-ea" 2018-03-20

Java(TM) SE Runtime Environment 18.3 (build 10-ea+38)

Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10-ea+38, mixed mode)

 

  - VersionDependent class that displays “Java 10 version!"

    C:\Users\cardal\Temp\mrtest\src10\com\emc\demo\VersionDependent.java

  - Compile it from C:\Users\cardal\Temp\mrtest\src10\com\emc\demo:

    "C:\Program Files\Java\jdk-10\bin\javac"    -d C:\users\cardal\temp\mrtest\out-mr\java10  VersionDependent.java

    This creates:

      C:\Users\cardal\Temp\mrtest\out-mr\java10\com\emc\demo\VersionDependent.class

 

3. Copy over Java 8 class from the Java 8 system:

      C:\temp\mrtest\out-mr\java8\com\emc\demo\VersionDependent.class

   to the Java 10 system:

      C:\Users\cardal\Temp\mrtest\out-mr\java8\com\emc\demo\VersionDependent.class

 

4. On the Windows 10 Java 10 system, create the multi-release JAR file from C:\Users\cardal\Temp\mrtest:

  "C:\Program Files\Java\jdk-10\bin\jar" --verbose --create --file out-mr\mr.jar -C out-mr\java8 . --release 10 -C out-mr\java10 .

C:\Users\cardal\Temp\mrtest>"C:\Program Files\Java\jdk-10\bin\jar" --verbose --create --file out-mr\mr.jar -C out-mr\java8 . --release 10 -C out-mr\java10 .

added manifest

adding: com/(in = 0) (out= 0)(stored 0%)

adding: com/emc/(in = 0) (out= 0)(stored 0%)

adding: com/emc/demo/(in = 0) (out= 0)(stored 0%)

adding: com/emc/demo/VersionDependent.class(in = 325) (out= 239)(deflated 26%)

adding: META-INF/versions/10/(in = 0) (out= 0)(stored 0%)

adding: META-INF/versions/10/com/(in = 0) (out= 0)(stored 0%)

adding: META-INF/versions/10/com/emc/(in = 0) (out= 0)(stored 0%)

adding: META-INF/versions/10/com/emc/demo/(in = 0) (out= 0)(stored 0%)

adding: META-INF/versions/10/com/emc/demo/VersionDependent.class(in = 315) (out= 231)(deflated 26%)

  This creates:

    C:\Users\cardal\Temp\mrtest\out-mr\mr.jar on Java 10 system.

==================

Use the new mr.jar to create the Applet test:

1. On the Windows Java 1.8 131 system:

Copy the new mr.jar to C:\temp\project\lib

 

2. C:\Temp\project\appletExample\TestAppletLAC.java uses import com.emc.demo.VersionDependent;

   and displays VersionDependent.version.

                              String test =  new VersionDependent().version();

 

3. Compile from C:\Temp\project\appletExample:

  "C:\Program Files\Java\jdk1.8.0_131\bin\javac.exe"  TestAppletLAC.java -classpath ..\lib\mr.jar

-> created C:\temp\project\appletExample\TestAppletLAC.class

 

4. From c:\temp\project>, create the JAR file:

  "C:\Program Files\Java\jdk1.8.0_131\bin\jar.exe" cvf testAppletLAC.jar appletExample\TestAppletLAC.class

-> created C:\temp\project\testAppletLAC.jar

 

5. From C:\temp\project\starthtml:

  "C:\Program Files\Java\jdk1.8.0_131\bin\keytool.exe" -genkey -keystore lackey256.store -alias lacjws -sigalg SHA256withDSA

    Enter keystore password:                                                       I used sysadmin

    Re-enter new password:

    What is your first and last name?

      [Unknown]:  Larry Cardani

    What is the name of your organizational unit?

      [Unknown]:  IME

    What is the name of your organization?

      [Unknown]:  EMC

    What is the name of your City or Locality?

      [Unknown]:  Hopkinton

    What is the name of your State or Province?

      [Unknown]:  MA

    What is the two-letter country code for this unit?

      [Unknown]:  US

    Is CN=Larry Cardani, OU=IME, O=EMC, L=Hopkinton, ST=MA, C=US correct?

      [no]:  yes

    Enter key password for <lacjws>

        (RETURN if same as keystore password):

  This creates C:\temp\project\starthtml\lackey256.store

 

6. Copy testAppletLAC.jar from project folder to starthtml folder.

   Copy mr.jar from lib folder to starthtml folder.

 

7. From the starthtml folder:

  "C:\Program Files\Java\jdk1.8.0_131\bin\jarsigner" -keystore lackey256.store testAppletLAC.jar lacjws

    Enter Passphrase for keystore:

    jar signed.

    Warning:

    The signer certificate will expire within six months.

    No -tsa or -tsacert is provided and this jar is not timestamped. Without a timestamp, users may not be able to validate this jar after the signer certificate's

     expiration date (2018-01-21) or after any future revocation date.

 

  This updated testAppletLAC.jar

 

8. From the starthtml folder:

  "C:\Program Files\Java\jdk1.8.0_131\bin\jarsigner" -keystore lackey256.store mr.jar lacjws

    Enter Passphrase for keystore:

    jar signed.

    Warning:

    The signer certificate will expire within six months.

    No -tsa or -tsacert is provided and this jar is not timestamped. Without a timestamp, users may not be able to validate this jar after the signer certificate's

    expiration date (2018-01-21) or after any future revocation date.

 

   This updated mr.jar

==================

On the Windows 2003 Java 8 system:

1. testLAC.html:  Uses mr.jar and testAppletLAC.jar.

 

2. Add file:///C:/temp/project/starthtml/testLAC.html to the Java exceptions list.

 

(clear java and ie cache)

 

3. Internet Explorer 8:

Browse to: file:///C:/temp/project/starthtml/testLAC.html

Click on Allow blocked content.

Click on I accept the risk and click on Run.

-> Web page shows:

          Major version: 1.8.0_131 (the JRE on the Windows 2003 system)

          VersionDependent.version is not null.  Output: Java 8 or earlier version

 

This shows that the Multi-Release JAR file is running the proper class file version.

==================

Test with files local:

On the Windows 10 Java 10 system:

1. Copy the entire project folder to the Windows 10 system, running JRE Java 10.

 

2. Add exception file:///C:/users/cardal/Temp/project/starthtml/testLAC.html

 

Clear java and ie caches

 

3. Internet Explorer 11:

Browse to: file:///C:/users/cardal/temp/project/starthtml/testLAC.html

Click on Allow blocked content.

Click on I accept the risk and click on Run.

-> Web page shows:

          Major version: 10-ea (the JRE on the Windows 10 system)

          VersionDependent.version is not null.  Output: Java 8 or earlier version!

 

This implies that the Multi-Release JAR file is probably STILL running the wrong class file version.