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From "Dyre Tjeldvoll (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-1078) Be able to build Derby when JAVA_HOME is set 1.6
Date Thu, 20 Apr 2006 10:30:07 GMT
    [ http://issues.apache.org/jira/browse/DERBY-1078?page=comments#action_12375322 ] 

Dyre Tjeldvoll commented on DERBY-1078:
---------------------------------------

Since revision 395458 I can no longer run jdbcapi/metadata.java with DerbyNetClient under
java 1.3.  (Still compiling with 1.4). I get the following error:

Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/derby/iapi/services/i18n/MessageService
(Unsupported major.minor version 48.0)
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:488)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:106)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:243)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:51)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:190)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:183)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:294)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:288)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:310)
        at org.apache.derby.impl.tools.sysinfo.Main.getCompleteMessage(Main.java:1077)
        at org.apache.derby.impl.tools.sysinfo.Main.getTextMessage(Main.java:1056)
        at org.apache.derby.impl.tools.sysinfo.Main.<clinit>(Main.java:316)
        at org.apache.derby.tools.sysinfo.main(sysinfo.java:52)
Framework: DerbyNetClient
*** Start: metadata jdk1.3.1_15 DerbyNetClient 2006-04-20 11:17:30 ***


> Be able to build Derby when JAVA_HOME is set 1.6
> ------------------------------------------------
>
>          Key: DERBY-1078
>          URL: http://issues.apache.org/jira/browse/DERBY-1078
>      Project: Derby
>         Type: Improvement

>   Components: Build tools
>     Versions: 10.2.0.0
>     Reporter: Rick Hillegas
>      Fix For: 10.3.0.0
>  Attachments: derby-1078.diff
>
> Currently, the 1.4 compiler is used to build most of Derby. We use the 1.6 compiler to
(optionally) build the JDBC4 support. If you try to build Derby in a shell window with a 1.6
JAVA_HOME, the 1.4 bits will fail to build. This is because those bits do not satisfy the
JDBC4 contract. In addition, even if you could build those bits under 1.6, the 1.6 class files
would fail to load on a 1.4 vm.
> We need to be able to use 1.6 as our default build environment but still generate jar
files which run on 1.4 and 1.5. There may be compiler switches which allow this. If not, building
in a 1.6 environment could fault in the 1.4 compiler as necessary.

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