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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6856) Make it possible to build Derby using JDK 9
Date Sat, 14 Jan 2017 17:15:26 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15822871#comment-15822871
] 

Rick Hillegas commented on DERBY-6856:
--------------------------------------

Unfortunately, build 151 does not fix the following problem which surfaced in build 148: the
failure of our test harness to find the derbyall suite. The problem seems to be that the Java
9 class loader no longer finds resources which the Java 8 class loader can locate. The following
sample program demonstrates this problem. Compile this program with jdk 8 and put the derby
jars on your classpath. This is the output when you run the program on jdk 8...

input stream = sun.net.www.protocol.jar.JarURLConnection$JarURLInputStream@3f99bd52

...and this is the output when you run the program on jdk 9...

input stream = null

Here is the program:

{noformat}
public class Derby6856_MissingResource
{
  public static void main(String... args) throws Exception
  {
    String resourceName = "/org/apache/derbyTesting/functionTests/suites/derbyall.properties";
    Class dummyClass = (new Object()).getClass();
    Object is = dummyClass.getResourceAsStream(resourceName);

    System.out.println("input stream = " + is);
  }
}
{noformat}

It appears that resource resolution has changed significantly in the recent builds of JDK
9. I expect that this change will be an unwelcome surprise to many users.


> Make it possible to build Derby using JDK 9
> -------------------------------------------
>
>                 Key: DERBY-6856
>                 URL: https://issues.apache.org/jira/browse/DERBY-6856
>             Project: Derby
>          Issue Type: Improvement
>          Components: Build tools
>    Affects Versions: 10.12.1.1
>            Reporter: Rick Hillegas
>         Attachments: derby-6856-01-ab-addShardingKey.diff, derby-6856-01-ac-cleanup.diff,
derby-6856-02-aa-addShardingKey.diff, derby-6856-03-aa-autoboxingDeprecationWarnings.diff,
derby-6856-03-ab-autoboxingDeprecationWarnings.diff, derby-6856-04-aa-autoboxingDeprecationWarnings-part2.diff,
derby-6856-04-ab-autoboxingDeprecationWarnings-part2.diff, derby-6856-05-ac-roundingMode-Class.newInstance.diff,
derby-6856-05-af-roundingMode-Class.getDeclaredConstructor.diff, derby-6856-05-ag-roundingMode-Class.newInstance.diff,
derby-6856-06-aa-observable.diff, derby-6856-07-aa-oneMoreNewInstance.diff, derby-6856-08-aa-cleanupJavadoc.diff,
derby-6856-09-aa-javadocEntities.diff, derby-6856-XX-ab-base.diff, derby-6856-XX-ac-base.diff,
PTest.java, ptestScript
>
>
> Derby can't be built with JDK 9. Java 9 introduces new JDBC classes like java.sql.ShardingKey
and methods which refer to these new classes.
> In addition, project Jigsaw has created a new way to name classes (see http://openjdk.java.net/jeps/220).
This breaks the PropertySetter build tool which we use so that old JVMs can compile Derby
and so that Derby can be compiled to run on old JVMs.
> It is likely that we will need to leave this issue open throughout the development cycle
of Java 9.



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